SpringMVC（一）搭建ssm框架全过程，遇到得坑记录

朱雀 2021-12-15 10:41 358阅读 0赞

题记：找到一篇关于activiti的书，打算根据书去做一些学习，自己搭建ssm框架遇到一些坑，以做记录！

一，搭建过程，代码记录

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二，项目结构

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三、配置文件代码

applicationContext.xml代码示例：

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <beans xmlns="http://www.springframework.org/schema/beans"
  3.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
  4.        xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
  5.        xmlns:p="http://www.springframework.org/schema/p"
  6.        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
  7.         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
  8.         http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
  9.         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
  10.     <!-- 自动扫描指定目录，将控制器加载到bean -->
  11.     <context:component-scan base-package="top.wj.demo" />
  13.     <!-- 配置 druid 数据源 -->
  14.     <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
  15.         <!-- 基本属性 url、user、password、driverClass -->
  16.         <property name="username" value="action" />
  17.         <property name="password" value="" />
  18.         <property name="driverClassName" value="com.mysql.jdbc.Driver" />
  19.         <property name="url" value="jdbc:mysql://119.23.108.107:3306/activiti?useUnicode=true$characterEncoding=utf8$useSSL=false" />
  20.     </bean>
  22.     <!-- 配置 sessionFactory -->
  23.     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
  24.         <property name="dataSource" ref="dataSource" />
  25.         <property name="mapperLocations">
  26.             <list>
  27. <!--                <value>classpath:com/frame/**/*Mapper.xml</value>-->
  28.                 <value>classpath:mapper/*.xml</value>
  29.             </list>
  30.         </property>
  31.     </bean>
  33.     <!-- 配置 sqlSessionTemplate 持久化模板 -->
  34.     <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
  35.         <constructor-arg ref="sqlSessionFactory" />
  36.     </bean>
  38.     <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"
  39.           p:basePackage="top.wj.demo.mapper"
  40.           p:sqlSessionFactoryBeanName="sqlSessionFactory"/>
  42.     <!-- 配置事物管理器 -->
  43.     <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
  44.         <property name="dataSource" ref="dataSource" />
  45.     </bean>
  47.     <!-- 配置事物传播行为 -->
  48.     <tx:advice id="txAdvice" transaction-manager="transactionManager">
  49.         <tx:attributes>
  50.             <tx:method name="get*" read-only="true" />
  51.             <tx:method name="find*" read-only="true" />
  52.             <tx:method name="select*" read-only="true" />
  53.             <tx:method name="*" propagation="REQUIRED" />
  54.         </tx:attributes>
  55.     </tx:advice>
  57.     <!-- 配置事物切入点 -->
  58.     <aop:config>
  59.         <aop:pointcut expression="execution(* top.wj.demo.service.*.*(..))" id="pointCut" />
  60.         <aop:advisor advice-ref="txAdvice" pointcut-ref="pointCut" />
  61.     </aop:config>
  62.     <!-- 开始声明式事务（事物注解） -->
  63.     <tx:annotation-driven transaction-manager="transactionManager" />
  64. </beans>

spring-mvc.xml代码示例：

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <beans xmlns="http://www.springframework.org/schema/beans"
  3.        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
  4.        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
  5.         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
  7.     <!-- 自动将控制器加载到bean -->
  8.     <context:component-scan base-package="top.wj.demo.controller" />
  10.     <!-- 配置视图解析器 -->
  11.     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  12.         <property name="prefix" value="/views/" />
  13.         <property name="suffix" value=".jsp" />
  14.         <!-- 可为空,方便实现自已的依据扩展名来选择视图解释类的逻辑 -->
  15.         <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
  16.     </bean>
  18.     <!-- 返回json 需导入 jackson-annotations.jar，jackson-core.jar，jackson-databind.jar -->
  19.     <!-- 通过处理器映射DefaultAnnotationHandlerMapping来开启支持@Controller注解 -->
  20.     <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" />
  21.     <!-- 通过处理器适配器AnnotationMethodHandlerAdapter来开启支持@RequestMapping注解 -->
  22.     <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
  23.         <property name="messageConverters">
  24.             <list>
  25.                 <!-- 配置返回字符串编码 -->
  26.                 <bean
  27.                         class="org.springframework.http.converter.StringHttpMessageConverter">
  28.                     <property name="supportedMediaTypes">
  29.                         <list>
  30.                             <value>text/html; charset=UTF-8</value>
  31.                             <value>application/json;charset=UTF-8</value>
  32.                         </list>
  33.                     </property>
  34.                 </bean>
  35.                 <!-- 配置 json 转换器 -->
  36.                 <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
  37.                     <property name="supportedMediaTypes">
  38.                         <list>
  39.                             <value>text/html; charset=UTF-8</value>
  40.                             <value>application/json;charset=UTF-8</value>
  41.                         </list>
  42.                     </property>
  43.                 </bean>
  44.             </list>
  45.         </property>
  46.     </bean>
  47. </beans>

web.xml代码示例：

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  3.          xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  4.          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
  5.          id="WebApp_ID" version="3.1">
  6.   <display-name>ssm</display-name>
  8.   <!-- 过滤器解决中文乱码问题、强制编码 UTF-8 -->
  9.   <filter>
  10.     <filter-name>characterEncodingFilter</filter-name>
  11.     <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
  12.     <init-param>
  13.       <param-name>encoding</param-name>
  14.       <param-value>UTF-8</param-value>
  15.     </init-param>
  16.     <init-param>
  17.       <param-name>forceRequestEncoding</param-name>
  18.       <param-value>true</param-value>
  19.     </init-param>
  20.   </filter>
  21.   <filter-mapping>
  22.     <filter-name>characterEncodingFilter</filter-name>
  23.     <url-pattern>/</url-pattern>
  24.   </filter-mapping>
  26.   <!-- 配置 springMVC 基本配置 -->
  27.   <servlet>
  28.     <servlet-name>springMVC</servlet-name>
  29.     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  30.     <init-param>
  31.       <param-name>contextConfigLocation</param-name>
  32.       <param-value>classpath:spring/spring-mvc.xml</param-value>
  33.     </init-param>
  34.     <load-on-startup>1</load-on-startup>
  35.   </servlet>
  36.   <servlet-mapping>
  37.     <servlet-name>springMVC</servlet-name>
  38.     <url-pattern>/</url-pattern>
  39.   </servlet-mapping>
  41.   <!-- 配置 spring 监听器 -->
  42.   <!-- needed for ContextLoaderListener -->
  43.   <context-param>
  44.     <param-name>contextConfigLocation</param-name>
  45.     <param-value>classpath:spring/applicationContext.xml</param-value>
  46.   </context-param>
  47.   <!-- Bootstraps the root web application context before servlet initialization -->
  48.   <listener>
  49.     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  50.   </listener>
  52.   <!-- 配置欢迎页 -->
  53.   <welcome-file-list>
  54.     <welcome-file>views/index.jsp</welcome-file>
  55.   </welcome-file-list>
  57. </web-app>

pom.xml代码示例：

  1. <?xml version="1.0" encoding="UTF-8"?>
  3. <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5.   <modelVersion>4.0.0</modelVersion>
  7.   <groupId>top.wj.springmvc</groupId>
  8.   <artifactId>springmvc-demo</artifactId>
  9.   <version>1.0-SNAPSHOT</version>
  10.   <packaging>war</packaging>
  12.   <name>springmvc-demo Maven Webapp</name>
  13.   <!-- FIXME change it to the project's website -->
  14.   <url>http://www.example.com</url>
  16.   <!--  原始配置-->
  17.   <!--  <properties>-->
  18.   <!--    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>-->
  19.   <!--    <maven.compiler.source>1.7</maven.compiler.source>-->
  20.   <!--    <maven.compiler.target>1.7</maven.compiler.target>-->
  21.   <!--  </properties>-->
  23.   <!--  <dependencies>-->
  24.   <!--    <dependency>-->
  25.   <!--      <groupId>junit</groupId>-->
  26.   <!--      <artifactId>junit</artifactId>-->
  27.   <!--      <version>4.11</version>-->
  28.   <!--      <scope>test</scope>-->
  29.   <!--    </dependency>-->
  30.   <!--  </dependencies>-->
  32.   <properties>
  33.     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  34.     <spring.framework.version>5.1.8.RELEASE</spring.framework.version>
  35.     <aspectj.version>1.9.4</aspectj.version>
  36.     <jackson.version>2.9.9</jackson.version>
  37.     <logback.version>1.2.3</logback.version>
  38.   </properties>
  40.   <dependencies>
  41.     <!-- 添加 commons 依赖包 -->
  42.     <dependency>
  43.       <groupId>commons-fileupload</groupId>
  44.       <artifactId>commons-fileupload</artifactId>
  45.       <version>1.3.3</version>
  46.     </dependency>
  47.     <dependency>
  48.       <groupId>commons-io</groupId>
  49.       <artifactId>commons-io</artifactId>
  50.       <version>2.5</version>
  51.     </dependency>
  52.     <dependency>
  53.       <groupId>org.apache.commons</groupId>
  54.       <artifactId>commons-lang3</artifactId>
  55.       <version>3.6</version>
  56.     </dependency>
  58.     <!-- 添加 spring 依赖包 -->
  59.     <dependency>
  60.       <groupId>org.springframework</groupId>
  61.       <artifactId>spring-aspects</artifactId>
  62.       <version>${spring.framework.version}</version>
  63.     </dependency>
  64.     <dependency>
  65.       <groupId>org.springframework</groupId>
  66.       <artifactId>spring-context</artifactId>
  67.       <version>${spring.framework.version}</version>
  68.     </dependency>
  69.     <dependency>
  70.       <groupId>org.springframework</groupId>
  71.       <artifactId>spring-jdbc</artifactId>
  72.       <version>${spring.framework.version}</version>
  73.     </dependency>
  74.     <dependency>
  75.       <groupId>org.springframework</groupId>
  76.       <artifactId>spring-webmvc</artifactId>
  77.       <version>${spring.framework.version}</version>
  78.     </dependency>
  79.     <dependency>
  80.       <groupId>org.springframework</groupId>
  81.       <artifactId>spring-context-support</artifactId>
  82.       <version>${spring.framework.version}</version>
  83.     </dependency>
  85.     <!-- 添加 aspectJ 依赖包 -->
  86.     <dependency>
  87.       <groupId>org.aspectj</groupId>
  88.       <artifactId>aspectjweaver</artifactId>
  89.       <version>${aspectj.version}</version>
  90.     </dependency>
  91.     <dependency>
  92.       <groupId>org.aspectj</groupId>
  93.       <artifactId>aspectjrt</artifactId>
  94.       <version>${aspectj.version}</version>
  95.     </dependency>
  97.     <!-- 添加 mybatis 依赖包 -->
  98.     <dependency>
  99.       <groupId>org.mybatis</groupId>
  100.       <artifactId>mybatis</artifactId>
  101.       <version>3.5.1</version>
  102.     </dependency>
  103.     <dependency>
  104.       <groupId>org.mybatis</groupId>
  105.       <artifactId>mybatis-spring</artifactId>
  106.       <version>1.3.1</version>
  107.     </dependency>
  109.     <!-- 添加 druid 依赖包 -->
  110.     <dependency>
  111.       <groupId>com.alibaba</groupId>
  112.       <artifactId>druid</artifactId>
  113.       <version>1.1.18</version>
  114.     </dependency>
  116.     <!-- 添加 mysql 驱动 -->
  117.     <dependency>
  118.       <groupId>mysql</groupId>
  119.       <artifactId>mysql-connector-java</artifactId>
  120.       <version>8.0.16</version>
  121.     </dependency>
  123.     <!-- 添加 jackson 依赖包 -->
  124.     <dependency>
  125.       <groupId>com.fasterxml.jackson.core</groupId>
  126.       <artifactId>jackson-databind</artifactId>
  127.       <version>${jackson.version}</version>
  128.     </dependency>
  130.     <!-- 添加 servlet 依赖包 -->
  131.     <dependency>
  132.       <groupId>javax.servlet</groupId>
  133.       <artifactId>javax.servlet-api</artifactId>
  134.       <version>4.0.1</version>
  135.     </dependency>
  137.     <!-- 添加 jstl 依赖包 -->
  138.     <dependency>
  139.       <groupId>javax.servlet</groupId>
  140.       <artifactId>jstl</artifactId>
  141.       <version>1.2</version>
  142.     </dependency>
  144.     <!-- 添加 logback 依赖包 -->
  145.     <dependency>
  146.       <groupId>ch.qos.logback</groupId>
  147.       <artifactId>logback-classic</artifactId>
  148.       <version>${logback.version}</version>
  149.     </dependency>
  150.     <dependency>
  151.       <groupId>junit</groupId>
  152.       <artifactId>junit</artifactId>
  153.       <version>4.12</version>
  154.       <scope>compile</scope>
  155.     </dependency>
  157.   </dependencies>
  159.   <build>
  160.     <finalName>SpringMVC</finalName>
  161.     <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
  162.       <plugins>
  163.         <plugin>
  164.           <artifactId>maven-clean-plugin</artifactId>
  165.           <version>3.1.0</version>
  166.         </plugin>
  167.         <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
  168.         <plugin>
  169.           <artifactId>maven-resources-plugin</artifactId>
  170.           <version>3.0.2</version>
  171.         </plugin>
  172.         <plugin>
  173.           <artifactId>maven-compiler-plugin</artifactId>
  174.           <version>3.8.0</version>
  175.         </plugin>
  176.         <plugin>
  177.           <artifactId>maven-surefire-plugin</artifactId>
  178.           <version>2.22.1</version>
  179.         </plugin>
  180.         <plugin>
  181.           <artifactId>maven-war-plugin</artifactId>
  182.           <version>3.2.2</version>
  183.         </plugin>
  184.         <plugin>
  185.           <artifactId>maven-install-plugin</artifactId>
  186.           <version>2.5.2</version>
  187.         </plugin>
  188.         <plugin>
  189.           <artifactId>maven-deploy-plugin</artifactId>
  190.           <version>2.8.2</version>
  191.         </plugin>
  192.       </plugins>
  193.     </pluginManagement>
  194.     <!--    找不到包地址-->
  196.     <!-- maven项目中src源代码下的xml等资源文件编译进classes文件夹，
  197.         注意：如果没有这个，它会自动搜索resources下是否有mapper.xml文件，
  198.         如果没有就会报org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.pet.mapper.PetMapper.selectByPrimaryKey-->
  199.     <resources>
  200.       <resource>
  201.         <directory>src/main/java</directory>
  202.         <includes>
  203.           <include>**/*.xml</include>
  204.         </includes>
  205.       </resource>
  206.       <!--将resources目录下的配置文件编译进classes文件  -->
  207.       <resource>
  208.         <directory>src/main/resources</directory>
  209.       </resource>
  210.     </resources>
  211.   </build>
  212. </project>

BaseMapper.xml约束头代码示例:

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
  3. <mapper namespace="top.wj.demo.mapper">
  4. </mapper>

四、Java代码示例：

TestController.java

  1. package top.wj.demo.controller;
  3. import org.junit.Test;
  4. import org.springframework.beans.factory.annotation.Autowired;
  5. import org.springframework.web.bind.annotation.GetMapping;
  6. import org.springframework.web.bind.annotation.RequestMapping;
  7. import org.springframework.web.bind.annotation.ResponseBody;
  8. import org.springframework.web.bind.annotation.RestController;
  9. import top.wj.demo.entity.TUser;
  10. import top.wj.demo.mapper.TestMapper;
  11. import top.wj.demo.service.TestService;
  13. import java.util.List;
  15. @RestController
  16. @RequestMapping("/testController")
  17. public class TestController {
  19.     @Autowired
  20.     private TestService testService;
  22.     @GetMapping("/testMethod")
  23.     @ResponseBody
  24.     public String testMethod(){
  25.         List<TUser> usersList=testService.testMethod();
  26.         System.out.println(usersList+".....");
  27.         return "hello";
  28.     }
  30.     @Test
  31.     public void test(){
  32.         List<TUser> users = testService.testMethod();
  33.         System.out.println(users);
  34.     }
  35. }

TestService.java代码示例：

  1. package top.wj.demo.service.impl;
  3. import org.springframework.beans.factory.annotation.Autowired;
  4. import org.springframework.stereotype.Service;
  5. import org.springframework.transaction.annotation.Transactional;
  6. import top.wj.demo.entity.TUser;
  7. import top.wj.demo.mapper.TestMapper;
  8. import top.wj.demo.service.TestService;
  10. import java.util.List;
  12. @Transactional
  13. @Service
  14. public class TestServiceImpl implements TestService {
  15.     @Autowired
  16.     private TestMapper testMapper;
  18.     @Override
  19.     public List<TUser> testMethod() {
  20.         List<TUser> tUserList=testMapper.testMethod();
  21.         return tUserList;
  22.     }
  23. }

TestMapper.java代码示例：

  1. package top.wj.demo.mapper;
  3. import org.springframework.stereotype.Repository;
  4. import top.wj.demo.entity.TUser;
  6. import java.util.List;
  8. @Repository
  9. public interface TestMapper {
  10.     /**
  11.      * 测试
  12.      * @return
  13.      */
  14.     List<TUser> testMethod();
  15. }

TUser.java代码示例：

  1. package top.wj.demo.entity;
  3. import org.springframework.stereotype.Component;
  5. @Component
  6. public class TUser {
  7.     private Integer id;
  8.     private String userName;
  9.     private String password;
  10.     private Integer age;
  12.     public Integer getId() {
  13.         return id;
  14.     }
  16.     public void setId(Integer id) {
  17.         this.id = id;
  18.     }
  20.     public String getUserName() {
  21.         return userName;
  22.     }
  24.     public void setUserName(String userName) {
  25.         this.userName = userName;
  26.     }
  28.     public String getPassword() {
  29.         return password;
  30.     }
  32.     public void setPassword(String password) {
  33.         this.password = password;
  34.     }
  36.     public Integer getAge() {
  37.         return age;
  38.     }
  40.     public void setAge(Integer age) {
  41.         this.age = age;
  42.     }
  43. }

数据库脚本：

  1. DROP TABLE IF EXISTS `t_user`;
  3. CREATE TABLE `t_user` (
  4.   `id` int(11) NOT NULL AUTO_INCREMENT,
  5.   `user_name` varchar(40) NOT NULL,
  6.   `password` varchar(255) NOT NULL,
  7.   `age` int(4) NOT NULL,
  8.   PRIMARY KEY (`id`)
  9. ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
  11. insert  into `t_user`(`id`,`user_name`,`password`,`age`) values (1,'WJ','wwwwwwwww',24);

这些是搭建项目的基础配置，下面总结一下遇到的坑

报错一：

watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3c4OTM5MzI3NDc_size_16_color_FFFFFF_t_70 3

搭建好项目激动之余看到报错即震惊又难受，难道我老了？搭建一个ssm还跑不起来，

原因：配置了spring扫描没有配置mybatis扫描mapper文件，所以找不到mapper配置文件！

watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3c4OTM5MzI3NDc_size_16_color_FFFFFF_t_70 4

  1. <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"
  2.           p:basePackage="top.wj.demo.mapper"
  3.           p:sqlSessionFactoryBeanName="sqlSessionFactory"/>

报错二：

启动没错但是访问不到Controller，浏览器访问一直报404，在网上看了很多文章，说的各种问题，其实是controller扫描不到

原因是在psringmvc配置文件中没有扫描controller

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报错三：访问到了controller但是请求走到service就报错

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原因是因为applicationContext.xml文件中扫描mapper缺少一层目录

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