Spring-Boot学习第一天+整合servlet,filter,listen+文件上传

逃离我推掉我的手 2024-02-19 21:48 12阅读 0赞

今天开始学习spring-boot  
一：新建sprinf-boot的hello-word项目  
1.新建maven项目，修改pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
     	
     	 <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.5.22.RELEASE</version>
         </parent>
        
      <groupId>cn.zds</groupId>
      <artifactId>01-spring-boot-hello</artifactId>
      <version>0.0.1-SNAPSHOT</version>
    	
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    		</dependency>
    	</dependencies>
    	
    	<properties>
    		<java.version>1.7</java.version>
    	</properties>
    </project>

2.因为启动器（就是maven配置依赖的那堆jar包）含有springmvc。所以可以直接编写controller

package cn.zds.controller;
    
    import java.util.HashMap;
    import java.util.Map;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    @Controller
    public class HelloWorldController {
    	
    	@RequestMapping("/hello")
    	@ResponseBody
    	public Map<String, Object> getHello() {
    		
    		Map<String, Object> map=new HashMap<String, Object>();
    		map.put("msg", "hello,world");
    		return map;
    		
    	}
    }

3.编写启动器（**注意启动器的类必须要能直达controller**），意思就是启动器的类App要么在controller的上一级（比如controller在cn.zds.controller，那么启动器要在cn.zds中），要么就是在同一包中（cn.zds.controller中）。

package cn.zds.controller;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication  //启动类的标记
    public class App {
    
    	public static void main(String[] args) {
    	
    		SpringApplication.run(App.class, args);
    	}
    
    }

4.目录结构：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyMDExNTY1_size_16_color_FFFFFF_t_70]  
二：spring整合servlet  
配置不变，pom.xml和上面的hello项目一样就好  
1.通过注解方式注册servlet组件  
1.1编写servlet

package cn.zds.servlet;
    
    import java.io.IOException;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    @WebServlet(name="FirstServlet",urlPatterns="/firstServlet")
    public class FirstServlet extends HttpServlet {
    	@Override
    	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    		System.out.println("FisetServlet.............");
    	}
    }

1.2编写启动类  
![在这里插入图片描述][20190807193444368.png]

2.通过方法完成servlet组件的注册  
2.1编写servlet

package cn.zds.servlet;
    
    import java.io.IOException;
    
    import javax.servlet.ServletException;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    
    public class SecondServlet extends HttpServlet {
    	@Override
    	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    		System.out.println("FisetServlet.............");
    	}
    }

2.2编写启动器

package cn.zds;
    
    import javax.servlet.annotation.WebServlet;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.ServletComponentScan;
    import org.springframework.boot.web.servlet.ServletRegistrationBean;
    import org.springframework.context.annotation.Bean;
    
    import cn.zds.servlet.SecondServlet;
    
    @SpringBootApplication
    public class App2 {
    
    	public static void main(String[] args) {
    	
    	SpringApplication.run(App2.class, args);
    	}
    	
    	@Bean
    	public ServletRegistrationBean getServletRegistrationBean(){
    		ServletRegistrationBean bean=new ServletRegistrationBean(new SecondServlet());
    		bean.addUrlMappings("/secondServlet");
    		return bean;
    	}
    
    }

三：spring-boot整合filter  
1.通过注解方式注册  
1.1编写filter

package cn.zds.filter;
    
    import java.io.IOException;
    
    import javax.servlet.Filter;
    import javax.servlet.FilterChain;
    import javax.servlet.FilterConfig;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRequest;
    import javax.servlet.ServletResponse;
    import javax.servlet.annotation.WebFilter;
    //@WebFilter(filterName="FirstFilterNmae",urlPatterns={"*.do","*.jsp"})多种地址写法
    @WebFilter(filterName="FirstFilterNmae",urlPatterns="/first")
    public class FirstFilter implements Filter {
    
    	@Override
    	public void destroy() {
    		// TODO Auto-generated method stub
    		
    	}
    
    	@Override
    	public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
    			throws IOException, ServletException {
    		System.out.println("进入Filter....");
    		arg2.doFilter(arg0, arg1);
    		System.out.println("离开Filter。。。。。");
    		
    	}
    
    	@Override
    	public void init(FilterConfig arg0) throws ServletException {
    		System.out.println("FirstFilterInit..........");
    		
    	}
    
    }

1.2编写启动器

2.通过方法注册filter  
2.1编写filter

package cn.zds.filter;
    
    import java.io.IOException;
    
    import javax.servlet.Filter;
    import javax.servlet.FilterChain;
    import javax.servlet.FilterConfig;
    import javax.servlet.ServletException;
    import javax.servlet.ServletRequest;
    import javax.servlet.ServletResponse;
    import javax.servlet.annotation.WebFilter;
    
    
    public class SecondFilter implements Filter {
    
    	@Override
    	public void destroy() {
    		// TODO Auto-generated method stub
    		
    	}
    
    	@Override
    	public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
    			throws IOException, ServletException {
    		System.out.println("进入Filter....");
    		arg2.doFilter(arg0, arg1);
    		System.out.println("离开Filter。。。。。");
    		
    	}
    
    	@Override
    	public void init(FilterConfig arg0) throws ServletException {
    		System.out.println("FirstFilterInit..........");
    		
    	}
    
    }

2.2编写启动器

package cn.zds;
    
    import javax.servlet.annotation.WebServlet;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.FilterRegistrationBean;
    import org.springframework.boot.web.servlet.ServletComponentScan;
    import org.springframework.boot.web.servlet.ServletRegistrationBean;
    import org.springframework.context.annotation.Bean;
    
    import cn.zds.filter.SecondFilter;
    
    
    @SpringBootApplication
    
    public class App2 {
    
    	public static void main(String[] args) {
    	
    		SpringApplication.run(App2.class, args);
    	}
    	@Bean
    	public FilterRegistrationBean getFilterRegistrationBean(){
    		FilterRegistrationBean bean=new FilterRegistrationBean(new SecondFilter());
    		bean.addUrlPatterns("/first");
    		return bean;
    		
    	}
    
    }

四：spring-boot整合listen  
1.通过注解方式注册listen  
1.1编写listen

package cn.zds.filter;
    
    import javax.servlet.ServletContextEvent;
    import javax.servlet.ServletContextListener;
    import javax.servlet.annotation.WebListener;
    @WebListener
    public class FirstListen implements ServletContextListener {
    
    	@Override
    	public void contextDestroyed(ServletContextEvent arg0) {
    		// TODO Auto-generated method stub
    
    	}
    
    	@Override
    	public void contextInitialized(ServletContextEvent arg0) {
    		System.out.println("我是listen初始化。。。。。");
    
    	}
    
    }

1.2编写启动器

2通过方法注册listen  
2.1编写listen

package cn.zds.filter;
    
    import javax.servlet.ServletContextEvent;
    import javax.servlet.ServletContextListener;
    import javax.servlet.annotation.WebListener;
    
    public class SecondListen implements ServletContextListener {
    
    	@Override
    	public void contextDestroyed(ServletContextEvent arg0) {
    		// TODO Auto-generated method stub
    
    	}
    
    	@Override
    	public void contextInitialized(ServletContextEvent arg0) {
    		System.out.println("我是listen2初始化。。。。。");
    
    	}
    
    }

2.2编写启动器

package cn.zds;
    
    import javax.servlet.annotation.WebServlet;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.ServletComponentScan;
    import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
    import org.springframework.context.annotation.Bean;
    
    import cn.zds.filter.SecondListen;
    
    @SpringBootApplication
    public class App2 {
    
    	public static void main(String[] args) {
    	
    		SpringApplication.run(App2.class, args);
    	}
    
    	@Bean
    	public ServletListenerRegistrationBean<SecondListen> getServletListenerRegistrationBean(){
    		ServletListenerRegistrationBean<SecondListen> bean=new ServletListenerRegistrationBean<SecondListen> (new SecondListen());
    		return bean;
    		
    	}
    }

五：spring-boot整合文件上传  
1.在classpath路径（**也就是src/main/resources**）新建**application.proterties**文件（配置文件，用以配置上传文件的大小）

spring.http.multipart.maxFileSize=200MB
    spring.http.multipart.maxRequestSize=200MB

2.在classpath路径新建static文件，再在static文件中新建前端文件index.html用来提交文件

<!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>文件上传</title>
    </head>
    <body>
    <form action="fileUpload" method="post" enctype="multipart/form-data">
    	上传文件：<input type="file" name="filename"> </br>
    	<input type="submit">
    
    </form>
    </body>
    </html>
    3.编写controller接受来自前端得到请求
    package cn.zds.controller;
    
    import java.io.File;
    import java.io.IOException;
    import java.util.HashMap;
    import java.util.Map;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.multipart.MultipartFile;
    
    @RestController  //默认返回值转换成json 功能相当于@controller跟responbody结合
    public class FileUploadController {
    	@RequestMapping("/fileUpload")
    	public Map<String, Object> fileUpload(MultipartFile filename) throws IllegalStateException, IOException {
    		System.out.println(filename.getOriginalFilename());
    		filename.transferTo(new File("d:/"+filename.getOriginalFilename()));
    		Map<String, Object> map=new HashMap<String, Object>();
    		map.put("msg", "ok");
    		return map;
    	}
    }

4.编写启动器

5.目录结构  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyMDExNTY1_size_16_color_FFFFFF_t_70 1]

***说明：为啥要加application.proterties。因为默认上传最大不能超过10MB，application.proterties可以对其重新设置，这里设置为200MB了***

六：静态文件存放  
1.在classpath目录下新建static，静态文件存放在这里  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyMDExNTY1_size_16_color_FFFFFF_t_70 2]  
2.或者存放在这里  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyMDExNTY1_size_16_color_FFFFFF_t_70 3]  
好好学习，今天先到这里，明天学spring-boot视图层技术

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyMDExNTY1_size_16_color_FFFFFF_t_70]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/515d78d3d07b459b9b95dca327035194.png
[20190807193444368.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/d4470a8587ea445cb5aabde82dc8a09c.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyMDExNTY1_size_16_color_FFFFFF_t_70 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/eb25f4e068c94322b7770384dc3cd535.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyMDExNTY1_size_16_color_FFFFFF_t_70 2]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/002cd371ab0d4fb6b10379fe31b1f1f0.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQyMDExNTY1_size_16_color_FFFFFF_t_70 3]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/29/2c8cf4adc6cb45bc8fea45dd038557c8.png