SpringMVC（一）搭建ssm框架全过程，遇到得坑记录

朱雀 2021-12-15 10:41 242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

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3c4OTM5MzI3NDc_size_16_color_FFFFFF_t_70 2][]

三、配置文件代码

applicationContext.xml代码示例：

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
           xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
           xmlns:p="http://www.springframework.org/schema/p"
           xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
        
        <context:component-scan base-package="top.wj.demo" />
    
        
        <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
            
            <property name="username" value="action" />
            <property name="password" value="" />
            <property name="driverClassName" value="com.mysql.jdbc.Driver" />
            <property name="url" value="jdbc:mysql://119.23.108.107:3306/activiti?useUnicode=true$characterEncoding=utf8$useSSL=false" />
        </bean>
    
        
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource" />
            <property name="mapperLocations">
                <list>
    
                    <value>classpath:mapper/*.xml</value>
                </list>
            </property>
        </bean>
    
        
        <bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
            <constructor-arg ref="sqlSessionFactory" />
        </bean>
    
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"
              p:basePackage="top.wj.demo.mapper"
              p:sqlSessionFactoryBeanName="sqlSessionFactory"/>
    
        
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource" />
        </bean>
    
        
        <tx:advice id="txAdvice" transaction-manager="transactionManager">
            <tx:attributes>
                <tx:method name="get*" read-only="true" />
                <tx:method name="find*" read-only="true" />
                <tx:method name="select*" read-only="true" />
                <tx:method name="*" propagation="REQUIRED" />
            </tx:attributes>
        </tx:advice>
    
        
        <aop:config>
            <aop:pointcut expression="execution(* top.wj.demo.service.*.*(..))" id="pointCut" />
            <aop:advisor advice-ref="txAdvice" pointcut-ref="pointCut" />
        </aop:config>
        
        <tx:annotation-driven transaction-manager="transactionManager" />
    </beans>

spring-mvc.xml代码示例：

<?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
           xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd">
    
        
        <context:component-scan base-package="top.wj.demo.controller" />
    
        
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/views/" />
            <property name="suffix" value=".jsp" />
            
            <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
        </bean>
    
        
        
        <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" />
        
        <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
            <property name="messageConverters">
                <list>
                    
                    <bean
                            class="org.springframework.http.converter.StringHttpMessageConverter">
                        <property name="supportedMediaTypes">
                            <list>
                                <value>text/html; charset=UTF-8</value>
                                <value>application/json;charset=UTF-8</value>
                            </list>
                        </property>
                    </bean>
                    
                    <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
                        <property name="supportedMediaTypes">
                            <list>
                                <value>text/html; charset=UTF-8</value>
                                <value>application/json;charset=UTF-8</value>
                            </list>
                        </property>
                    </bean>
                </list>
            </property>
        </bean>
    </beans>

web.xml代码示例：

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xmlns="http://xmlns.jcp.org/xml/ns/javaee"
             xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
             id="WebApp_ID" version="3.1">
      <display-name>ssm</display-name>
    
      
      <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
          <param-name>encoding</param-name>
          <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
          <param-name>forceRequestEncoding</param-name>
          <param-value>true</param-value>
        </init-param>
      </filter>
      <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/</url-pattern>
      </filter-mapping>
    
      
      <servlet>
        <servlet-name>springMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath:spring/spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
      </servlet>
      <servlet-mapping>
        <servlet-name>springMVC</servlet-name>
        <url-pattern>/</url-pattern>
      </servlet-mapping>
    
      
      
      <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring/applicationContext.xml</param-value>
      </context-param>
      
      <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
      </listener>
    
      
      <welcome-file-list>
        <welcome-file>views/index.jsp</welcome-file>
      </welcome-file-list>
    
    </web-app>

pom.xml代码示例：

<?xml version="1.0" encoding="UTF-8"?>
    
    <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>
    
      <groupId>top.wj.springmvc</groupId>
      <artifactId>springmvc-demo</artifactId>
      <version>1.0-SNAPSHOT</version>
      <packaging>war</packaging>
    
      <name>springmvc-demo Maven Webapp</name>
      
      <url>http://www.example.com</url>
    
      
      
      
      
      
      
    
      
      
      
      
      
      
      
      
    
      <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <spring.framework.version>5.1.8.RELEASE</spring.framework.version>
        <aspectj.version>1.9.4</aspectj.version>
        <jackson.version>2.9.9</jackson.version>
        <logback.version>1.2.3</logback.version>
      </properties>
    
      <dependencies>
        
        <dependency>
          <groupId>commons-fileupload</groupId>
          <artifactId>commons-fileupload</artifactId>
          <version>1.3.3</version>
        </dependency>
        <dependency>
          <groupId>commons-io</groupId>
          <artifactId>commons-io</artifactId>
          <version>2.5</version>
        </dependency>
        <dependency>
          <groupId>org.apache.commons</groupId>
          <artifactId>commons-lang3</artifactId>
          <version>3.6</version>
        </dependency>
    
        
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-aspects</artifactId>
          <version>${spring.framework.version}</version>
        </dependency>
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context</artifactId>
          <version>${spring.framework.version}</version>
        </dependency>
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-jdbc</artifactId>
          <version>${spring.framework.version}</version>
        </dependency>
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-webmvc</artifactId>
          <version>${spring.framework.version}</version>
        </dependency>
        <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-context-support</artifactId>
          <version>${spring.framework.version}</version>
        </dependency>
    
        
        <dependency>
          <groupId>org.aspectj</groupId>
          <artifactId>aspectjweaver</artifactId>
          <version>${aspectj.version}</version>
        </dependency>
        <dependency>
          <groupId>org.aspectj</groupId>
          <artifactId>aspectjrt</artifactId>
          <version>${aspectj.version}</version>
        </dependency>
    
        
        <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis</artifactId>
          <version>3.5.1</version>
        </dependency>
        <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis-spring</artifactId>
          <version>1.3.1</version>
        </dependency>
    
        
        <dependency>
          <groupId>com.alibaba</groupId>
          <artifactId>druid</artifactId>
          <version>1.1.18</version>
        </dependency>
    
        
        <dependency>
          <groupId>mysql</groupId>
          <artifactId>mysql-connector-java</artifactId>
          <version>8.0.16</version>
        </dependency>
    
        
        <dependency>
          <groupId>com.fasterxml.jackson.core</groupId>
          <artifactId>jackson-databind</artifactId>
          <version>${jackson.version}</version>
        </dependency>
    
        
        <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>javax.servlet-api</artifactId>
          <version>4.0.1</version>
        </dependency>
    
        
        <dependency>
          <groupId>javax.servlet</groupId>
          <artifactId>jstl</artifactId>
          <version>1.2</version>
        </dependency>
    
        
        <dependency>
          <groupId>ch.qos.logback</groupId>
          <artifactId>logback-classic</artifactId>
          <version>${logback.version}</version>
        </dependency>
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.12</version>
          <scope>compile</scope>
        </dependency>
    
      </dependencies>
    
      <build>
        <finalName>SpringMVC</finalName>
        <pluginManagement>
          <plugins>
            <plugin>
              <artifactId>maven-clean-plugin</artifactId>
              <version>3.1.0</version>
            </plugin>
            
            <plugin>
              <artifactId>maven-resources-plugin</artifactId>
              <version>3.0.2</version>
            </plugin>
            <plugin>
              <artifactId>maven-compiler-plugin</artifactId>
              <version>3.8.0</version>
            </plugin>
            <plugin>
              <artifactId>maven-surefire-plugin</artifactId>
              <version>2.22.1</version>
            </plugin>
            <plugin>
              <artifactId>maven-war-plugin</artifactId>
              <version>3.2.2</version>
            </plugin>
            <plugin>
              <artifactId>maven-install-plugin</artifactId>
              <version>2.5.2</version>
            </plugin>
            <plugin>
              <artifactId>maven-deploy-plugin</artifactId>
              <version>2.8.2</version>
            </plugin>
          </plugins>
        </pluginManagement>
        
    
        
        <resources>
          <resource>
            <directory>src/main/java</directory>
            <includes>
              <include>**/*.xml</include>
            </includes>
          </resource>
          
          <resource>
            <directory>src/main/resources</directory>
          </resource>
        </resources>
      </build>
    </project>

BaseMapper.xml约束头代码示例:

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

四、Java代码示例：

TestController.java

package top.wj.demo.controller;
    
    import org.junit.Test;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.ResponseBody;
    import org.springframework.web.bind.annotation.RestController;
    import top.wj.demo.entity.TUser;
    import top.wj.demo.mapper.TestMapper;
    import top.wj.demo.service.TestService;
    
    import java.util.List;
    
    @RestController
    @RequestMapping("/testController")
    public class TestController {
    
        @Autowired
        private TestService testService;
    
        @GetMapping("/testMethod")
        @ResponseBody
        public String testMethod(){
            List<TUser> usersList=testService.testMethod();
            System.out.println(usersList+".....");
            return "hello";
        }
    
        @Test
        public void test(){
            List<TUser> users = testService.testMethod();
            System.out.println(users);
        }
    }

TestService.java代码示例：

package top.wj.demo.service.impl;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import org.springframework.transaction.annotation.Transactional;
    import top.wj.demo.entity.TUser;
    import top.wj.demo.mapper.TestMapper;
    import top.wj.demo.service.TestService;
    
    import java.util.List;
    
    @Transactional
    @Service
    public class TestServiceImpl implements TestService {
        @Autowired
        private TestMapper testMapper;
    
        @Override
        public List<TUser> testMethod() {
            List<TUser> tUserList=testMapper.testMethod();
            return tUserList;
        }
    }

TestMapper.java代码示例：

package top.wj.demo.mapper;
    
    import org.springframework.stereotype.Repository;
    import top.wj.demo.entity.TUser;
    
    import java.util.List;
    
    @Repository
    public interface TestMapper {
        /**
         * 测试
         * @return
         */
        List<TUser> testMethod();
    }

TUser.java代码示例：

package top.wj.demo.entity;
    
    import org.springframework.stereotype.Component;
    
    @Component
    public class TUser {
        private Integer id;
        private String userName;
        private String password;
        private Integer age;
    
        public Integer getId() {
            return id;
        }
    
        public void setId(Integer id) {
            this.id = id;
        }
    
        public String getUserName() {
            return userName;
        }
    
        public void setUserName(String userName) {
            this.userName = userName;
        }
    
        public String getPassword() {
            return password;
        }
    
        public void setPassword(String password) {
            this.password = password;
        }
    
        public Integer getAge() {
            return age;
        }
    
        public void setAge(Integer age) {
            this.age = age;
        }
    }

数据库脚本：

DROP TABLE IF EXISTS `t_user`;
    
    CREATE TABLE `t_user` (
      `id` int(11) NOT NULL AUTO_INCREMENT,
      `user_name` varchar(40) NOT NULL,
      `password` varchar(255) NOT NULL,
      `age` int(4) NOT NULL,
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
    
    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][]

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

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3c4OTM5MzI3NDc_size_16_color_FFFFFF_t_70 5][]

报错三：访问到了controller但是请求走到service就报错

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3c4OTM5MzI3NDc_size_16_color_FFFFFF_t_70 6][]

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

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3c4OTM5MzI3NDc_size_16_color_FFFFFF_t_70 7][]

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