SSM整合

目录

1 ssm整合的原理

2 创建一个MAVEN-web工程

3. 添加依赖

4. 编写spring配置文件

5.配置web.xml

6. generator生成代码

7. 添加sql日志

---

1 ssm整合的原理

2 创建一个MAVEN-web工程

 并替换web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
         
</web-app>

3. 添加依赖

<?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>com.xzj</groupId>
  <artifactId>mySSM01</artifactId>
  <version>1.0-SNAPSHOT</version>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>6</source>
          <target>6</target>
        </configuration>
      </plugin>
    </plugins>
  </build>
  <packaging>war</packaging>


    <dependencies>
      <!--spring-webmvc-->
      <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.2.15.RELEASE</version>
      </dependency>

      <!--mybatis依赖-->
      <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.6</version>
      </dependency>

      <!--mybatis和spring整合的依赖-->
      <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.6</version>
      </dependency>

      <!--mysql驱动-->
      <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.28</version>
      </dependency>

      <!--druid连接池依赖-->
      <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.2.1</version>
      </dependency>

      <!--lombok依赖-->
      <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.24</version>
      </dependency>

      <!--jackson java对象转换为json对象 @ResponseBody-->
      <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.13.2.2</version>
      </dependency>

      <!--servlet-api依赖-->
      <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>4.0.1</version>
      </dependency>

      <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.2.15.RELEASE</version>
      </dependency>

      <!--generator-->
      <dependency>
        <groupId>org.mybatis.generator</groupId>
        <artifactId>mybatis-generator-core</artifactId>
        <version>1.4.0</version>
      </dependency>


      <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
      </dependency>
      <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.30</version>
      </dependency>
    </dependencies>


</project>

4. 编写spring配置文件

<?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:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--包扫描-->
    <context:component-scan base-package="com.xzj"/>

    <!--特殊注解的开启-->
    <mvc:annotation-driven/>

    <!--静态资源放行-->
    <mvc:default-servlet-handler/>

    <!--拦截器-->
        <mvc:interceptors>
            <mvc:interceptor>
                <mvc:mapping path="/**"/>
                <mvc:exclude-mapping path="/login"/>
                <mvc:exclude-mapping path="/login/findAll"/>
                <mvc:exclude-mapping path="/js/**"/>
                <mvc:exclude-mapping path="/css/**"/>
                <mvc:exclude-mapping path="/imgs/**"/>
                <bean class="com.xzj.interceptor.MyInterceptor"/>
            </mvc:interceptor>
        </mvc:interceptors>

    <!--数据源配置-->
   <bean id="ds" class="com.alibaba.druid.pool.DruidDataSource">
    <!--驱动名称-->
       <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
       <property name="url" value="jdbc:mysql://localhost:3306/mybatis?serverTimezone=Asia/Shanghai"/>
       <property name="username" value="root"/>
       <property name="password" value="pAssW0rd"/>
    <!--初始化连接池个数-->
       <property name="initialSize" value="5"/>
    <!--至少的个数-->
       <property name="minIdle" value="5"/>
    <!--最多的个数-->
       <property name="maxActive" value="10"/>
    <!--最长等待时间单位毫秒-->
       <property name="maxWait" value="3000"/>

   </bean>

    <!--sqlSessionFactory 整合mybaits-->
    <bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
      <property name="dataSource" ref="ds"/>
    <!--设置mybatis映射文件的路径-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>

    <!--为dao接口生成代理实现类-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <!--为com.xzj.dao包下的接口生成代理实现类-->
        <property name="basePackage" value="com.xzj.dao"/>
    </bean>
</beans>

 拦截器使用

package com.xzj.interceptor;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.xzj.util.CommonResult;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.PrintWriter;


public class MyInterceptor implements HandlerInterceptor {
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        response.setContentType("session/json;charset=utf-8");
        HttpSession session = request.getSession();
        Object user = session.getAttribute("user");
        if(user!=null){
            return true;
        }
        PrintWriter writer = response.getWriter();
        CommonResult result = new CommonResult(5001,"请先登录",null);
        ObjectMapper objectMapper = new ObjectMapper();
        String json = objectMapper.writeValueAsString(result);
        writer.print(json);
        writer.flush();
        writer.close();
        return false;
    }
}

5.配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

  <filter>
    <filter-name>encodingFilter</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>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!--加载springmvc配置-->
  <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:springmvc.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>
</web-app>

配置tomcat并启动

 缺少: <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.15.RELEASE</version>
    </dependency>

如果启动tomcat时就出现问题，那么有可能是spring配置文件出错。

6. generator生成代码

(1)依赖

<!--generator-->
    <dependency>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-core</artifactId>
      <version>1.4.0</version>
    </dependency>

(2)配置文件  

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>
    <!--找到你的mysql驱动jar的位置-->
    <classPathEntry location="E:\Maven\repMaven\mysql\mysql-connector-java\8.0.28\mysql-connector-java-8.0.28.jar"/>

    <context id="DB2Tables" targetRuntime="MyBatis3">
        <!--消除注释-->
        <commentGenerator>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <!--数据源的配置信息-->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/mybatis?serverTimezone=Asia/Shanghai"
                        userId="root"
                        password="pAssW0rd">
        </jdbcConnection>

        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!--java实体类的配置-->
        <javaModelGenerator targetPackage="com.xzj.entity" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!--映射文件的配置-->
        <sqlMapGenerator targetPackage="mapper" targetProject=".\src\main\resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!--dao数据访问层的配置-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.xzj.dao" targetProject=".\src\main\java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!--数据库表和实体的映射关系
             schema:数据库名称
             tableName: 表名
             domainObjectName:实体类名

             enableUpdateByExample:是否生成复杂的修改操作
       -->
        <table schema="mybatis" tableName="tb_user01" domainObjectName="User" enableCountByExample="false"
               enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false">

        </table>
        <table schema="mybatis" tableName="student01" domainObjectName="Student" enableCountByExample="false"
               enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false">

        </table>
    </context>
</generatorConfiguration>

(3) 测试

public class TestGeneratory {
    public static void main(String[] args) throws Exception {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("generator.xml");
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);
        myBatisGenerator.generate(null);
    }
}

7. 添加sql日志

<dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>

log4j.properties

log4j.rootLogger=DEBUG, Console
#Console
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.layout=org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n
log4j.logger.java.sql.ResultSet=INFO
log4j.logger.org.apache=INFO
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG