Spring [boot] 使用技巧集合-不断积累

快来打我* 2022-06-10 23:16 545阅读 0赞

# 0、项目更换环境 删除 .mvn 文件试试 #

比如更换了IDE 版本，会有一些奇奇怪怪的问题，删除 .mvn 从新点击maven 项目更新按钮即可

![20210609071308516.PNG][]

# 1、Spring  boot 如何允许跨域访问 #

第一种办法，使用Springboot的解决方案

<dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

\*全局级别

@Configuration
    public class MyWebMvcConfig implements WebMvcConfigurer{
        @Override
        public void addCorsMappings(CorsRegistry registry){
            registry.addMapping("/a/**")
              .allowedHeaders("*")//默认允许所有的请求头信息
                .allowedMethods("*")//默认支持GET\POST\HEAD
                .maxAges(1800)//DELETE、PUT 探测请求 options 验证有效期
                .allowedOrigins("http://localhost:8081");
        }
    }

\* 方法级别

@RestController
    public class TestController{
        @PostMapping("/a")
        @CrossOrigin(value="http://localhost:8081",maxAge=1800,allowedHeaders="*")
        public String testMathod(String name){
            return "receive:"+name;
        }
    }

第二种办法使用过滤器：

测试中遇到的问题，需要前段跨域访问，使用过滤器设置

extends OncePerRequestFilter

@Override
    	protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
    			throws ServletException, IOException {
    		request.setCharacterEncoding("utf-8");
    		response.setCharacterEncoding("utf-8");
    		response.setHeader("Content-Type", "application/json");
    		
    		response.setHeader("Access-Control-Allow-Origin", "*");//允许所以域名访问，*需要换位制定来源，务必注意这里
    		response.setHeader("Access-Control-Allow-Methods", "GET,POST,PUT,DELETE,OPTIONS");//允许的访问方式
    	    response.setHeader("Access-Control-Allow-Headers", "x-requested-with,content-type,auth_token");
    	    response.setHeader("Access-Control-Request-Headers", "x-requested-with,content-type,Accept,自定义header");
    		response.setHeader("Access-Control-Request-Method", "GET,POST,PUT,DELETE,OPTIONS");

filterChain.doFilter(request, response);
    	}

# 2、Spring boot发布到tomcat #

正常打包，war，启动，访问的时候需要项目的名字，需要注意的是，Spring boot 天然不支持tomcat 6了，虽然想点别的办法也可以，但是避免麻烦直接使用tomcat8吧

# 3、Spring boot 测试启动在项目外围 #

import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication(scanBasePackages = "com.bestcxx.stu.blog.*")
    @MapperScan("com.bestcxx.stu.blog.broker.repository.mysql")
    public class StarterApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(StarterApplication.class, args);
        }
    
    }

# 4、spring boot 结合 mybitas后如何打印sql语句 #

application.yml 文件中配置即可，但是这种模式打印日志会比较多，其实是可以制定打印日志的方法类的， ALT+/会提示，指定到 Mapper类所在包路径即可,\#是注释掉

logging:
      level:
        #root: DEBUG
        cn.test.dao: DEBUG

# 5、spring boot 整合 mock #

用于回滚

@Rollback(true)

extends AbstractTransactionalJUnit4SpringContextTests

maven依赖

<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    		
    		<dependency>
               <groupId>junit</groupId>
               <artifactId>junit</artifactId>
               <version>4.13.2</version>
               <scope>test</scope>
    		</dependency>

spring boot 1.4 之前，在测试类上方

@RunWith(SpringJUnit4ClassRunner.class)  
    
    @SpringApplicationConfiguration(classes = TestApplication.class) //使用TestApplication作为spring容器加载类
    
    @ActiveProfiles("test")   //这边test指配置文件指向spring-test.yml
    
    @Rollback(false) //单元测试配置数据库默认会事务会退  此时强制事务提交

spring boot 1.4之后，在测试类上方

@RunWith(SpringRunner.class)
    @SpringBootTest
    @WebAppConfiguration 
    @Rollback(false) //单元测试配置数据库默认会事务会退  此时强制事务提交

余下部分-从新包好了1.4后，类上方的配置

@RunWith(SpringRunner.class)
    @SpringBootTest
    @WebAppConfiguration 
    @Rollback(false) //单元测试配置数据库默认会事务会退  此时强制事务提交
    public class NameControllerTest extends AbstractTransactionalJUnit4SpringContextTests{
    	private MockMvc mockMvc;
    	@Autowired 
    	protected WebApplicationContext wac;
    
    	// 该方法在每个方法执行之前都会执行一遍
    	@Before
    	public void setUp() throws Exception {
    		//mockMvc = MockMvcBuilders.standaloneSetup(new NameController()).build();
    		mockMvc = MockMvcBuilders.webAppContextSetup(wac).build(); //初始化MockMvc对象
    	}
    
    	@Test
    	public void testAddDeliverAddress() throws UnsupportedEncodingException, Exception {
    		String responseString = mockMvc.perform(post("/path/") // 请求的url,请求的方法是post
    				.contentType(MediaType.APPLICATION_JSON) // 数据的格式
    				.param("a", "a") // 添加参数
    				.param("phone", "15000000000") // 添加参数
    		).andExpect(status().isOk()) // 返回的状态是200
    				.andDo(print()) // 打印出请求和相应的内容
    				.andReturn().getResponse().getContentAsString(); // 将相应的数据转换为字符串
    		System.out.println("--------返回的json = " + responseString);
    	}
    
    }

Spring MVC  MOCk:

http://www.cnblogs.com/lyy-2016/p/6122144.html

Maven

<dependency>  
                <groupId>org.springframework</groupId>  
                <artifactId>spring-test</artifactId>  
                <version>${springframework.version}</version>  
            </dependency>

测试类

package com.bestcxx.stu.springmvc.controller;
    
    import org.junit.Before;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.mock.web.MockHttpServletResponse;
    import org.springframework.test.annotation.DirtiesContext;
    import org.springframework.test.annotation.Rollback;
    import org.springframework.test.context.ContextConfiguration;
    import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    import org.springframework.test.context.web.WebAppConfiguration;
    import org.springframework.test.web.servlet.MockMvc;
    import org.springframework.test.web.servlet.MvcResult;
    import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
    import org.springframework.test.web.servlet.result.MockMvcResultHandlers;
    import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
    import org.springframework.test.web.servlet.setup.MockMvcBuilders;
    import org.springframework.web.context.WebApplicationContext;
    
    import junit.framework.TestCase;
    
    @DirtiesContext
    @WebAppConfiguration//单元测试的时候真实的开启一个web服务  
    @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration(locations={"classpath:spring/springmvc-servlet.xml"})
    //@TransactionConfiguration(transactionManager = "defaultTransactionManager",defaultRollback=false)//事务管理  
    @Rollback(true)
    public class HomeControllerTest extends AbstractTransactionalJUnit4SpringContextTests{
    	@Autowired
        private WebApplicationContext wac;
        private MockMvc mockMvc;
        @Before
        public void setup() {
            this.mockMvc = MockMvcBuilders.webAppContextSetup(this.wac).build();   //构造MockMvc
        }
        
        @Test
        public void testShouHomePage() throws Exception{
        	 MvcResult result = mockMvc.perform(MockMvcRequestBuilders.get("/home"))  
                     .andExpect(MockMvcResultMatchers.view().name("home"))
                     .andExpect(MockMvcResultMatchers.status().is(MockHttpServletResponse.SC_OK))
                     .andDo(MockMvcResultHandlers.print())
                     .andReturn();  
               
             TestCase.assertNotNull(result.getModelAndView().getModel().get("user"));  
        }
    }

控制台打印结果：

MockHttpServletRequest:
          HTTP Method = GET
          Request URI = /home
           Parameters = {}
              Headers = {}
    
    Handler:
                 Type = com.bestcxx.stu.springmvc.controller.HomeController
               Method = public java.lang.String com.bestcxx.stu.springmvc.controller.HomeController.shouHomePage(java.util.Map<java.lang.String, java.lang.String>)
    
    Async:
        Async started = false
         Async result = null
    
    Resolved Exception:
                 Type = null
    
    ModelAndView:
            View name = home
                 View = null
                Model = null
    
    FlashMap:
           Attributes = null
    
    MockHttpServletResponse:
               Status = 200
        Error message = null
              Headers = {}
         Content type = null
                 Body = 
        Forwarded URL = /WEB-INF/views/home.jsp
       Redirected URL = null
              Cookies = []
     INFO | Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED paused.
     INFO | Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED shutting down.
     INFO | Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED paused.
     INFO | Scheduler org.springframework.scheduling.quartz.SchedulerFactoryBean#0_$_NON_CLUSTERED shutdown complete.
     INFO | {dataSource-1} closed

# 6、Spring 提供的 url-页面 的现成的方法-无需业务逻辑处理 #

import org.springframework.context.annotation.Configuration;
    import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
    
    /**
     * 本类用于处理 不处理数据直接通过url 跳转到 页面的方法
     * 默认访问 /login  指向 login.html 页面
     * @author wj
     *
     */
    @Configuration
    public class WebMvcConfig extends WebMvcConfigurerAdapter{
    	
    	@Override
    	public void addViewControllers(ViewControllerRegistry registry) {
    		registry.addViewController("/login").setViewName("login");
    	}
    
    }

# 7、Spring validate 检测实体 #

Maven 依赖

<dependency>
    		<groupId>org.hibernate</groupId>
    		<artifactId>hibernate-validator</artifactId>
    		<version>5.4.1.Final</version>
    	</dependency>
    	<dependency>
    		<groupId>javax.el</groupId>
    		<artifactId>javax.el-api</artifactId>
    		<version>2.2.4</version>
    	</dependency>
    	<dependency>
    		<groupId>org.glassfish.web</groupId>
    		<artifactId>javax.el</artifactId>
    		<version>2.2.4</version>
    	</dependency>

Controller层

@ResponseBody
    	@RequestMapping(value="/model",method={RequestMethod.GET,RequestMethod.POST})
    	public HashMap<String,Object> model(@Valid @ModelAttribute("usermodel") UserModel usermodel,BindingResult bindingResult){
    		System.out.println("有userName吗："+usermodel.getUserName());
    		HashMap<String,Object> map=new HashMap<String,Object>();
    		if(bindingResult.hasErrors()){  
                List<ObjectError> ls=bindingResult.getAllErrors();  
                for (int i = 0; i < ls.size(); i++) {
                    System.out.println("error:"+ls.get(i));
                    map.put("result", "WRONG");
                    map.put("msg",ls.get(i).getDefaultMessage());
                    return map;
                }  
            }
    		map.put("result", "OK");
    		return map;
    	}

dto层-UserModel

字符串  @NotBlank 排除空字符串和“”

@NotEmpty  允许空字符串，不允许为“”

整形     @NotNull

public class UserModel implements Serializable{
    	
    	private static final long serialVersionUID = -2443619924488167195L;
    	/**使用 notblank 是不允许空字符串的*/
    	@Size(min=5,message="userName 长度不能小于5")
    	@NotBlank(message="userName 不允许为空，或者空字符串")
    	private String userName;
    	
    	
    	public String getUserName() {
    		return userName;
    	}
    	public void setUserName(String userName) {
    		this.userName = userName;
    	}
    	
    	
    	
    }

测试类-mock

package com.bestcxx.stu.springmvc.controller;
    
    import org.junit.Before;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.http.MediaType;
    import org.springframework.test.annotation.DirtiesContext;
    import org.springframework.test.annotation.Rollback;
    import org.springframework.test.context.ContextConfiguration;
    import org.springframework.test.context.junit4.AbstractTransactionalJUnit4SpringContextTests;
    import org.springframework.test.context.junit4.SpringRunner;
    import org.springframework.test.context.web.WebAppConfiguration;
    import org.springframework.test.web.servlet.MockMvc;
    import org.springframework.test.web.servlet.MvcResult;
    import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
    import org.springframework.test.web.servlet.result.MockMvcResultHandlers;
    import org.springframework.test.web.servlet.result.MockMvcResultMatchers;
    import org.springframework.test.web.servlet.setup.MockMvcBuilders;
    import org.springframework.web.context.WebApplicationContext;
    
    
    @DirtiesContext
    @RunWith(SpringRunner.class) //@RunWith(SpringJUnit4ClassRunner.class)  也是可以的
    @WebAppConfiguration   //单元测试的时候真实的开启一个web服务    
    @ContextConfiguration(locations={"classpath:spring/springmvc-servlet.xml"}) 
    //@TransactionConfiguration(transactionManager = "defaultTransactionManager",defaultRollback=false)//事务管理    
    @Rollback(true)  
    public class ParameterControllerTest extends AbstractTransactionalJUnit4SpringContextTests{  
        @Autowired  
        private WebApplicationContext wac;  
        private MockMvc mockMvc;  
        @Before  
        public void setup() {  
            this.mockMvc = MockMvcBuilders.webAppContextSetup(wac).build();   //构造MockMvc  
        }  
          
        @Test  
        public void testModel() throws Exception{  
             MvcResult mvcResult = mockMvc.perform(MockMvcRequestBuilders.post("/parameterController/model") // 请求的url,请求的方法是post  
                     .contentType(MediaType.APPLICATION_JSON) // 数据的格式  
                     .param("name"," " ) // 增加参数
             ).andExpect(MockMvcResultMatchers.status().isOk()) // 返回的状态是200
                     .andDo(MockMvcResultHandlers.print()) // 打印出请求和相应的内容  
                     .andReturn(); // 将相应的数据转换为字符串  
             System.out.println("--------返回的json = " + mvcResult.getResponse().getContentAsString());  
        }  
    }

如果是Spring Boot 测试，@SpringBootTest后面也是可以指定文件位置的，也可以默认不指定

@RunWith(SpringRunner.class)  
    @SpringBootTest  
    @WebAppConfiguration   
    @Rollback(true) //单元测试配置数据库默认会事务会退  此时强制事务提交

# 8、Spring Boot  devtool 环境配置、自动构建 #

（1）增加maven依赖

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <optional>true</optional>
                <scope>runtime</scope>
            </dependency>

配置文件

默认 application.yml

内容：

spring :
      profiles :
        active : dev

子配置文件 application-dev.yml

![20210818125231151.png][]  
（2）eclipse中开启自动构建功能-会降低开发效率哦

Project-Build Automatically

![20171108105712543][]

# 9、 SpringBoot 自动将 Date 类型参数 转化为指定类型到前端 #

最简单的方法,在 yml 文件中增加配置,实体类是 java.util.Date ,前端会收到一个字符串

spring:
      jackson:
        date-format: yyyy-MM-dd HH:mm:ss
        time-zone: GMT+8

第二种方法是在实体的 date 类型的字段上增加一个注解

@com.fasterxml.jackson.annotation.JsonFormat(timezone = "GMT+8", pattern ="yyyy-MM-dd HH:mm:ss")
    private java.util.Date createTime;

# 10、Spring代码中获取yml文件中的配置信息 #

> 使用全路径

@Value("${weixinAndAli.wechatNotifyUrl}")

> 在 Bean 配置中加载yml 文件的指定内容

比如下面，获取 yml 文件中 spring.datasource 相关的代码

@ConfigurationProperties(prefix = "spring.datasource")
        @Bean
        public DataSource dataSource(){
            return new DruidDataSource();
        }

# 11、传入单个参数 #

@RestController
    @RequestMapping("/fee")
    @Api(value = "描述信息", description = "描述信息")
    public class FeeController{
    
    
    @GetMapping(value = "query")
    	@ApiOperation(value = "描述信息")
    	public FeeInfoQueryResponseVO getFeeInfo(@ApiParam @RequestParam(value="merchantNo",required = true)String merchantNo, HttpServletRequest request,
    			HttpServletResponse response) {
    
    }

# 12、使用jar包启动 #

\* 最简单的:

java -jar E:/name-0.0.1-SNAPSHOT.jar

\* 指定端口

java -jar E:/name-0.0.1-SNAPSHOT.jar  --server.port=8080

\* 将输入信息打入日志

java -jar E:/name-0.0.1-SNAPSHOT.jar > E:/my.log &

\* 允许后段运行

nohup java -jar E:/name-0.0.1-SNAPSHOT.jar

\* 完整展示(指定端口、后端运行、日志输入到指定文件)

nohup java -jar E:/name-0.0.1-SNAPSHOT.jar  --server.port=8080  > E:/my.log &

\* 后台运行方式（会生成 nohub.out 和 log.file 两个文件）

nohup java -jar xxx.jar  > log.file  2>&1 &

# 13、SpringBoot 指定 profile #

> 首先方式有很多种

第一种

# yml 文件中指定 spring.profiles.active=test
    # 亦可在 main 方法中SpringApplicationBuilder.application().setAdditionalProfiles("test")
    # 亦可在启动时 --spring.profiles.active=test
    # 如果是maven 启动，可以添加  -P test

第二种：pom 中指定， 为激活项，这里可以添加 build 从而改变默认的  build 目录

<profiles>
        
        <profile>
            <id>dev</id>
            <properties>
                <environment>dev</environment>
            </properties>
            <activation>
                <activeByDefault>true</activeByDefault>
            </activation>
        </profile>
        <profile>
            <id>test</id>
            <properties>
                <environment>test</environment>
            </properties>
        </profile>
        <profile>
            <id>prod</id>
            <properties>
                <environment>prod</environment>
            </properties>
        </profile>
    </profiles>

# 14、SpringBoot Idea 2020 Maven 地址改不了 #

[https://blog.csdn.net/weixin\_43423864/article/details/109403880][https_blog.csdn.net_weixin_43423864_article_details_109403880]

删除 .mvn 文件 ,然后从新修改 maven 文件刷新即可

# 15、使用默认统一版本管理 spring-boot-starter-parent #

spring-boot-starter-parent 是一个特殊的Starter,提供了一些Maven的默认配置，同时还提供了 dependency-management，可以使开发者在引入其他依赖时不必输入版本号，方便依赖管理。

一般我们会把这个依赖作为 parent，例如

org.springgramework.boot

spring-boot-starter-parent

2.0.4.RELEASE

# 16、Web 的 Starter spring-boot-starter-web #

如果新建一个web项目，可以引入下面的依赖，就可以简单的启动了

org.springgramework.boot

spring-boot-starter-web

然后在启动类上增加注解，看下面

## @SpringBootApplication 和 @EnableAutoConfiguration、@ComponentScan、@MapperScan ##

@SpringBootApplication 包含了 @EnableAutoConfiguration， @EnableAutoConfiguration表示开启自动化配置，比如对于Starter spring-boot-starter-web，表示自动进行Spring和Spring MVC的配置。

@SpringBootApplication 还包含了 @ComponentScan 的功能

第一种方式:

@SpringBootApplication(exclude = \{DataSourceAutoConfiguration.class\}, scanBasePackages = "a.b.c.\*")

第二种方式:

@ComponentScan(basePackages = \{  
       "a.b.c.1",  
       "a.b.c.2"  
\})

@MapperScan 扫描Mapper 不用再使用 @Repository 注解了

@SpringBootApplication(scanBasePackages = "com.bestcxx.stu.blog.*")
    @MapperScan("com.bestcxx.stu.blog.broker.repository.mysql")

# 17、Unable to find main class #

Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.0.7.RELEASE:repackage (default) on project grocery-product-spu-inner-api: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:2.0.7.RELEASE:repackage failed: Unable to find main class

去掉下面的maven plugin 配置即可

org.springframework.bootspring-boot-maven-plugin

# 18、SpringBoot 引入 xml 配置 #

\* 在 resources 目录下添加xml文件

\* 在配置类中增加@ImportResource("classpath:demo-applicationContext.xml")

# 19、fastjson/Gson #

· fastjson

<dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.78</version>
            </dependency>

使用：JSON.toJSONString(response1)

#  #

·Gson

<dependency>
                <groupId>com.google.code.gson</groupId>
                <artifactId>gson</artifactId>
                <version>2.8.7</version>
            </dependency>

Gson gson = new Gson();
    HomeInfo homeInfo = new HomeInfo();
    homeInfo.name="test";
    homeInfo.age=20;
    return gson.toJson(homeInfo);

# 20、全局异常捕获(返回JSON) #

import com.alibaba.fastjson.JSON;
    import com.bestcxx.stu.blog.broker.BaseEnum;
    import com.bestcxx.stu.blog.broker.BaseResponse;
    import com.bestcxx.stu.blog.broker.exception.BaseException;
    import org.springframework.web.bind.annotation.ControllerAdvice;
    import org.springframework.web.bind.annotation.ExceptionHandler;
    
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    import java.io.PrintWriter;
    
    @ControllerAdvice
    public class GlobalExceptionResolver {
    
        @ExceptionHandler(RuntimeException.class)
        public void globalExceptionResolver(RuntimeException e, HttpServletResponse response) throws IOException {
    
            BaseResponse response1 = null;
            if(e instanceof BaseException){
                response1 = new BaseResponse(BaseEnum.FAIL.getCode(),e.getMessage());
            }else if(e instanceof IllegalArgumentException){
                response1 = new BaseResponse(BaseEnum.FAIL.getCode(),e.getMessage());
            }
            response.setContentType("text/html;charset=utf-8");
            PrintWriter printWriter = response.getWriter();
            printWriter.write(JSON.toJSONString(response1));
            printWriter.flush();
            printWriter.close();
        }
    }

# 21、guava #

<dependency>
                <groupId>com.google.guava</groupId>
                <artifactId>guava</artifactId>
                <version>18.0</version>
            </dependency>

使用：Preconditions.checkArgument(Objects.nonNull(userInfo),"访问者为空");

# 22、lombok #

<dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.18.12</version>
                <scope>provided</scope>
                <optional>true</optional>
            </dependency>

\* Idea 需要安装 lombok 插件

代码层面写完整如下

import lombok.AllArgsConstructor;
    import lombok.Builder;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    
    @Builder
    @Data
    @NoArgsConstructor
    @AllArgsConstructor
    public class TestRequest {
        private Long id;
    }

# 23、拦截器 #

以来 spring-boot-starter-web

\* 实现 HandlerInterceptor 接口

实际访问顺序为 preHandle->Controller->postHandle->afterCompletion

/**
    *实际访问顺序为 preHandle->Controller->postHandle->afterCompletion
    */
    public class MyInterceptor implements HandlerInterceptor{
        
        @Override
        public boolean preHandle(HttpServletRequest request,
        HttpServletResponse response,
        Object handler
        ){
        System.out.println("MyInterceptor=>preHandle");
        return true;
       }
    
        @Override
        public void postHandle(HttpServletRequest request,
        HttpServletResponse response,
        Object handler,ModelAndView mdv
        ){
        System.out.println("MyInterceptor=>postHandle");
        
       }
    
        @Override
        public void afterCompletion(HttpServletRequest request,
        HttpServletResponse response,
        Object handler,Exception ex
        ){
        System.out.println("MyInterceptor=>afterCompletion");
       }
        
    }

\* 配置 拦截器

@Configuration
    public class WebMvcConfig implements WebMvcConfigurer{
        @Override
        public void addInterceptors(InterceptorRegistry registry){
            registry.addInterceptor(new MyInterceptor())//这里引入自定义的拦截器类
            .addPathPatterns("/**")//设置需拦截路径
            .excludePathPatterns("/hello");//设置需要排除的路径
        }
    }

# 24、启动系统任务 #

打印参数同 main 方法配置 Environment Program arguments

\--name=111 --age=222

打印结果

MyApplicationRunner>>\[111\]  
MyApplicationRunner>>\[222\]  
MyCommandLineRunner>>\[--name=111, --age=222\]

\* 顺序

Order 相同 ApplicationRunner先执行，Order 不同，数小的先执行

\* ApplicationRunner

@Component
    @Order(1)
    public class MyApplicationRunner implements ApplicationRunner {
        @Override
        public void run(ApplicationArguments args) throws Exception {
            args.getOptionNames().forEach(item->{
                System.out.println("MyApplicationRunner>>"+args.getOptionValues(item));
            });
        }
    }

\* CommandLineRunner

@Component
    @Order(1)//order小的先执行
    public class MyCommandLineRunner implements CommandLineRunner {
        //打印参数同 main 方法配置 Environment Program arguments,参数为数组
        public void run(String... args) throws Exception {
            System.out.println("MyCommandLineRunner>>"+ Arrays.toString(args));
        }
    }

# 25、SpringBoot 整合 Servlet、Filter、Listener #

\* 第一步:在启动类增加注解 @ServletComponent

\* 第二步:编写具体代码

@WebServlet("/my")
    public class MyServlet extends HttpServlet{
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp){
            doPost(req,resp);
        }
        
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp){
            System.out.println("name>>>"+reg.getParamter("name"));
        }
    }
    
    @WebFilter("/*")
    public class MyFilter implements Filter{
        @Override
        public void init(FilterConfig filterConfig){
            System.out.println(""MyFilter>>>init);
        }
        
        @Override
        public void doFilter(ServletRequest req,ServletResponse resp,FilterChain chain)   {
        System.out.println("MyFilter>>>doFilter");
        }
        
        @Override
           public void destroy(){
            System.out.println("MyFilter>>>destroy");
        }
    }
    
    @WebListener
    public class MyListener implements ServletRequestListener{
        @Override
        public void requestDestroyed(ServletRequestEvent sre){
            System.out.println("MyListener>>>requestDestroyed");
        }
    
        @Override
        public void requestInitialized(ServletRequestEvent sre){
            System.out.println("MyListener>>>requestInitialized");
        }
    
    }

# 26、路径映射 #

可以使用Controller ，对于无需资源加载可以直接跳转的，比如登陆页，可以直接配置

不过前后端分离场景，这个就没必要了

@Configuration
    public class WebMvcConfig implements WebMvcConfigurer{
        @OVerride
        public void addViewControllers(ViewControllerRegistry registry){
            registry.addViewController("/login").setViewName("login");
        }
    }

# 27、SpringBoot 结合 AOP #

\* 第一步：增加Maven依赖

<dependency>
    <groupId>org.springgramework.boot</groupId>
    <artifactId>spring-boot-starter-aop</artifactId>
    </dependency>

\* 第二步：配置切面

@Component
    @Aspect
    public class LogAgent{
        @Pointcut("execution(* com.bestcxx.stu.*.*(..))")
        public void aspect(){}
        
        @Before(value="aspect()")
        public void before(JoinPoint jp){
            String name = jp.getSignature().getName();
            System.out.println(name+"方法开始执行...");
        }
    
        @After(value="aspect()")
        public void after(JoinPoint jp){
            String name = jp.getSignature().getName();
            System.out.println(name+"方法执行结束...");
        }
    
        @AfterReturn(value="aspect()" ,returning = "result")
        public void afterReturning(JoinPoint jp,Object result){
            String name=jp.getSignature().getName();
            System.out.println(name+"方法返回值"+result)
        }
    
        @AfterThrowing(value="aspect()",throwing="e")
        public void afterThrowing(JointPoint jp,Exception e){
            String name = jp.getSignature().getName();
            System.out.println(name+"方法抛出异常，异常是:"+e.getMessage());
        }
        
        @Around("aspect()")
        public Object around(ProceedingJoinPoint pjp) throws Throwable{
            return pjp.proceed();
        }
    }

# 28、SpringBoot 配置 mybatis #

[https://blog.csdn.net/bestcxx/article/details/79387763][https_blog.csdn.net_bestcxx_article_details_79387763]

# 29、SpringBoot 配置测试 #

Maven 依赖

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.13.2</version>
                <scope>test</scope>
            </dependency>

Java 代码基础类

import org.junit.runner.RunWith;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    
    @RunWith(SpringRunner.class)
    @SpringBootTest
    public class BaseTest {
    }

import com.bestcxx.stu.blog.BaseTest;
    import com.bestcxx.stu.blog.broker.repository.mysql.dao.ArticleMapper;
    import com.bestcxx.stu.blog.broker.repository.mysql.model.Article;
    import org.junit.Assert;
    import org.junit.Test;
    import org.springframework.beans.factory.annotation.Autowired;
    
    import java.util.Date;
    
    public class ArticleMapperTest extends BaseTest {
    
        @Autowired
        private ArticleMapper articleMapper;
    
        @Test
        public void testInsert(){
            Article article = new Article();
            article.setContent("测试内容");
            article.setCreateTime(new Date());
            article.setTilte("测试title");
            article.setUpdateTime(new Date());
            int result = articleMapper.insert(article);
            Assert.assertEquals(1,result);
        }
    }

# 30、整合 Mybatis #

https://blog.csdn.net/bestcxx/article/details/79387763

# 31、Springboot Controller 请求入参为实体+postMan测试 #

入参实体

Controller层

import com.alibaba.fastjson.JSON;
    import com.bestcxx.study.demo.brocker.controller.request.TestRequest;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    
    @RestController
    @RequestMapping(value="/test1")
    @Slf4j
    public class TestController {
    
        /**
         * 使用 @RequestBody注解 ，只接收JSON格式数据，即 raw-JSON 'contentType': 'application/json'
         * @param request
         */
        @PostMapping(value="/test2")
        public void test(@RequestBody  TestRequest request){
            log.info("request={}",JSON.toJSONString(request));
        }
    
        /**
         * 使用入参没有注解标注的实体，请求需要为 form-data
         * @param request
         */
        @PostMapping(value="/test3")
        public void test3(TestRequest request){
            log.info("request={}",JSON.toJSONString(request));
        }
    
    }

\* postMan @RequestBody 标注入参实体

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jlc3RjeHg_size_16_color_FFFFFF_t_70][]

\* postMan 无注解的入参实体

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jlc3RjeHg_size_16_color_FFFFFF_t_70 1][]

# 32、SpringBoot 集合 Redis（单机） #

· Maven

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-redis</artifactId>
                <exclusions>
                    <exclusion>
                        <groupId>io.letture</groupId>
                        <artifactId>letture-core</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
            <dependency>
                <groupId>redis.clients</groupId>
                <artifactId>jedis</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>

yml 配置

spring:
      #redis 相关
      redis:
        database: 0
        host: 127.0.0.1
        port: 6379
        password: 123456
        jedis:
          pool:
            # 最大连接数
            max-active: 8
            # 最大空闲连接数
            max-idle: 8
            # 最大阻塞等待时间，-1 无限制
            max-wait: -1ms
            # 最小空闲连接数
            min-idle: 0

Redis 服务demo

import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.data.redis.core.RedisTemplate;
    import org.springframework.data.redis.core.StringRedisTemplate;
    import org.springframework.data.redis.core.ValueOperations;
    import org.springframework.stereotype.Service;
    
    @Service
    public class RedisService<T> {
    
        @Autowired
        private RedisTemplate redisTemplate;
    
        @Autowired
        private StringRedisTemplate stringRedisTemplate;
    
        public void setStr(String key,String value){
            ValueOperations<String, String> valueOperations= stringRedisTemplate.opsForValue();
            valueOperations.set(key,value);
        }
    
        public <T> void setPO(String key,T t){
            ValueOperations valueOperations= redisTemplate.opsForValue();
            valueOperations.set(key,t);
        }
    
    }

# 33、SpringBoot 配置 Redis缓存 #

yml配置

cache-names 是分组，可以设置多个，逗号隔开

spring:
      #缓存配置
      cache:
        #redis 中的 key 都有一个前缀，默认前缀名就是 "缓存名::"
        cache-names: article
        redis:
          time-to-live: 1800s

注解说明

@CacheConfig 指定使用哪一个分组，不指定key，key就是入参
    @CachePut(key = "#article.id")，@CachePut 会把返参从新设置为缓存@CacheEvict(key = "#id")，会清楚缓存
    @Cacheable 缓存存在就用缓存，否则就查询后加入缓存

import com.bestcxx.stu.blog.broker.repository.mysql.dao.ArticleMapper;
    import com.bestcxx.stu.blog.broker.repository.mysql.model.Article;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.cache.annotation.CacheConfig;
    import org.springframework.cache.annotation.CacheEvict;
    import org.springframework.cache.annotation.CachePut;
    import org.springframework.cache.annotation.Cacheable;
    import org.springframework.stereotype.Service;
    import org.springframework.transaction.annotation.Isolation;
    import org.springframework.transaction.annotation.Propagation;
    import org.springframework.transaction.annotation.Transactional;
    
    @Service
    @CacheConfig(cacheNames="article")
    public class ArticleServiceImpl implements ArticleService{
    
        @Autowired
        private ArticleMapper articleMapper;
    
        @CachePut(key = "#article.id")
        @Transactional(isolation = Isolation.REPEATABLE_READ,propagation = Propagation.REQUIRED,rollbackFor = Exception.class)
        @Override
        public Article insert(Article article) throws Exception{
            int result = articleMapper.insert(article);
            if(result != 1){
                throw new Exception("保存失败");
            }
            return article;
        }
    
        @Cacheable
        @Override
        public Article getArticleById(Long id) {
            return articleMapper.selectByPrimaryKey(id);
        }
    
        @CachePut(key = "#article.id")
        @Transactional(isolation = Isolation.REPEATABLE_READ,propagation = Propagation.REQUIRED,rollbackFor = Exception.class)
        @Override
        public Article update(Article article) throws Exception {
            int result = articleMapper.updateByPrimaryKey(article);
            if(result != 1){
                throw new Exception("更新失败");
            }
            return article;
        }
    
        @CacheEvict(key = "#id")
        @Transactional(isolation = Isolation.REPEATABLE_READ,propagation = Propagation.REQUIRED,rollbackFor = Exception.class)
        @Override
        public void delete(Long id) throws Exception {
            int result = articleMapper.deleteByPrimaryKey(id);
            if(result != 1){
                throw new Exception("删除失败");
            }
        }
    }

# 34、devTool 的配置 #

可以用于idea 本地代码修改时自动重启服务

默认 /META\_INF/maven、/META-INF/resources、/resources、/static、/public 以及 /template 位置下的资源变化不会触发重启

maven

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-devtools</artifactId>
                <optional>true</optional>
            </dependency>

yml

spring:
      devtools:
        livereload:
          enabled: true
        restart:
          # 默认 resources 修改不会重启
          # 不重启目录排除
          exclude: src/main/test
          # 重启目录增加
          additional-paths: src/main/resources/static
          # 使用这种模式，修改项目且修改该文件才会触发重启 
          trigger-file: .triggle-file

idea 配置

1、File-Settings->Build、Execution、Deployment ->Compiler 勾选 Build project automatically

2、搜Action（快捷键为 Ctrl+Shift+Alt+/）: Maintenance

Registry->勾选 compile.autonake.allow.when.app.running

[20210609071308516.PNG]: /images/20220611/75dd9dbfaad14379bf4cec65f7207d70.png
[20210818125231151.png]: /images/20220611/1aa8abf60f304ff8bd344e7dfd67cc23.png
[20171108105712543]: /images/20220611/c54c3e4c0fb64cb3b3cd58102e7dc69f.png
[https_blog.csdn.net_weixin_43423864_article_details_109403880]: https://blog.csdn.net/weixin_43423864/article/details/109403880
[https_blog.csdn.net_bestcxx_article_details_79387763]: https://blog.csdn.net/bestcxx/article/details/79387763
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jlc3RjeHg_size_16_color_FFFFFF_t_70]: /images/20220611/0ddaf77244b74c18ace0658d414f060c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2Jlc3RjeHg_size_16_color_FFFFFF_t_70 1]: /images/20220611/d6a37130359f4ce088827e4c1a13fa16.png