[Java知识库]SSM框架整合---＞简单后台管理

一、数据库及实体类创建

数据库：

实体类：
Role

public class Role {
    private Long id;
    private String roleName;
    private String roleDesc;
    
    get/set/toString;
    
}

User

public class User {
    private Long id;
    private String username;
    private String email;
    private String password;
    private String phoneNum;
    //当前用户具备哪些角色
    private List<Role> roles;
      get/set/toString;
 }

二、配置文件

1.pom.xml

<?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>org.example</groupId>
    <artifactId>spring-test</artifactId>
    <version>1.0-SNAPSHOT</version>
     <dependencies>
        <!--   数据库驱动     -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.32</version>
        </dependency>
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <!--   spring     -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <!--   springMVC     -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.0.1</version>
            <scope>provided</scope>
        </dependency>
        <!--   mybatis     -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>javax.servlet.jsp-api</artifactId>
            <version>2.2.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.0</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.0</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.0</version>
        </dependency>
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.3</version>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.7</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
    </dependencies>
</project>

2.applicationContext.xml

<?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:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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.xsd
                           http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
                           http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
">

    <!--1、数据源-->
    <!-- 外部加载jdbc文件   -->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

    <!-- 2、配置jdbc模板对象-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"/>
    </bean>


    <!-- 3.配置SqlSessionFactory对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 配置MyBaties全局配置文件:mybatis-config.xml -->
        <property name="configLocation" value="classpath:sqlMapConfig.xml"/>
    </bean>

3.sqlMapConfig.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!--通过properties标签加载外部properties文件-->
    <properties resource="jdbc.properties"></properties>

    <!--自定义别名-->
    <typeAliases>
        <typeAlias type="com.domain.User" alias="user"></typeAlias>
        <typeAlias type="com.domain.Role" alias="role"></typeAlias>
    </typeAliases>
    <!--加载映射关系-->
    <mappers>
        <!--指定接口所在的包-->
        <package name="com.dao"></package>
    </mappers>
</configuration>

4.spring-mvc.xml

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

    <!--1、mvc注解驱动-->
    <mvc:annotation-driven/>
    <!--2、配置内部资源视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!--  /jsp/success.jsp  -->
        <property name="prefix" value="/pages/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

    <!--3、静态资源权限开放-->
    <!-- <mvc:resources mapping="/js/**" location="/js/"/>-->
    <!--  Tomcat找静态资源  -->
    <mvc:default-servlet-handler/>
    <!--4、组件扫描：扫描Controller-->
    <context:component-scan base-package="com.controller">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
</beans>

5.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">
    
    <!--全局初始化参数-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>

    <!--Spring监听器-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!--  SpringMVC的前端控制器  -->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--解决乱码的过滤器-->
    <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>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

</web-app>

三、功能实现

1.角色增删查

控制层Controller：

@RequestMapping("/role")
@Controller //代表RoleController用注解方式，但需要在springMVC配置文件中配置组件扫描
public class RoleController {
    @Autowired
    private RoleService roleService;
		//角色查询
    @RequestMapping("/list")
    public ModelAndView list() {
        ModelAndView modelAndView = new ModelAndView();
        List<Role> roleList = roleService.list();
        //设置模型对象
        modelAndView.addObject("roleList", roleList);
        //设置视图
        modelAndView.setViewName("role-list");
        return modelAndView;
    }
	//
    @RequestMapping("/save")
    public String save(Role role) {
        roleService.save(role);
        return "redirect:/role/list";
    }
    @RequestMapping("/del/{roleId}")
    public String del(@PathVariable("roleId") Long roleId) {
        roleService.del(roleId);
        return "redirect:/role/list";
    }
}

业务逻辑层Service
service接口：

public interface RoleService {
     public List<Role> list();

    void save(Role role);
    void del(Long roleId);
}

接口实现类：

public class RoleServiceImpl implements RoleService {
   
    @Autowired
    private RoleDao roleDao;

    @Override
    public List<Role> list() {
        List<Role> roleList = roleDao.findAll();
        return roleList;
    }

    @Override
    public void save(Role role) {
        roleDao.save(role);
    }

    @Override
    public void del(Long roleId) {
        roleDao.delRoleRel(roleId);
        roleDao.del(roleId);
    }
    }

持久层Dao

public interface RoleDao {
  @Select("select * from sys_role")
    @Results({
            @Result(column = "id", property = "id"),
            @Result(column = "roleName", property = "roleName"),
            @Result(column = "roleDesc", property = "roleDesc"),
    })
    List<Role> findAll();

    @Insert("insert into sys_role values(#{id},#{roleName},#{roleDesc})")
    void save(Role role);

    @Select("select * from sys_user_role ur,sys_role r where ur.roleId=r.id and ur.userId=#{id}")
    List<Role> findRoleByUserId(@Param("id") Long id);

    @Delete("delete from sys_user_role where roleId=#{roleId}")
    void delRoleRel(@Param("roleId") Long roleId);

    @Delete("delete from sys_role where id=#{roleId}")
    void del(@Param("roleId") Long roleId);
  }

效果展示：

2.用户增删查

控制层Controller：

@RequestMapping("/user")
@Controller
public class UserController {

    @Autowired
    private UserService userService;

    @Autowired
    private RoleService roleService;

    @RequestMapping("/list")
    public ModelAndView list() {
        ModelAndView modelAndView = new ModelAndView();
        List<User> userList = userService.list();
        //设置模型对象
        modelAndView.addObject("userList", userList);
        //设置视图
        modelAndView.setViewName("user-list");
        return modelAndView;
    }

    @RequestMapping("/saveUI")
    public ModelAndView saveUI() {
        ModelAndView modelAndView = new ModelAndView();
        List<Role> roleList = roleService.list();
        modelAndView.addObject("roleList", roleList);
        modelAndView.setViewName("user-add");
        return modelAndView;
    }

    @RequestMapping("/save")
    public String save(User user, Long[] roleIds) throws Exception {
        userService.save(user, roleIds);
        return "redirect:/user/list";
    }
    @RequestMapping("/del/{userId}")
    public String del(@PathVariable("userId") Long userId) {
        userService.del(userId);
        return "redirect:/user/list";
    }
}

业务逻辑层Service
service接口：

public interface UserService {
    public List<User> list();

    void save(User user, Long[] roleIds);

    void del(Long userId);
}

接口实现类：

public class UserServiceImpl implements UserService {
    @Autowired
    private UserDao userDao;
    @Autowired
    private RoleDao roleDao;
    @Override
    public List<User> list() {
        List<User> userList = userDao.findAll();
        //封装userList中的每一个User的roles数据
        for (User user : userList) {
            //获得user的id
            Long id = user.getId();
            //将id作为参数 查询当前userId对应的Role集合数据
            List<Role> roles = roleDao.findRoleByUserId(id);
            user.setRoles(roles);
        }
        return userList;
    }

    @Override
    //@Transactional(isolation = Isolation.READ_COMMITTED, propagation = Propagation.REQUIRED)
    public void save(User user, Long[] roleIds) {

        //第一步 向sys_user表中存储数据
        userDao.save(user);
        //第二步 向sys_user_role 关系表中存储多条数据
        for (Long roleId : roleIds) {
            userDao.saveUserRoleRel(user.getId(), roleId);
        }
    }

    @Override
    public void del(Long userId) {
        //1、删除中间关系表
        userDao.delUserRoleRel(userId);
        //2、删除User
        userDao.del(userId);
    }
}

持久层Dao

public interface UserDao {
    @Select("SELECT * FROM sys_user")
    @Results({
            @Result(id = true, column = "id", property = "id"),
            @Result(column = "username", property = "username"),
            @Result(column = "email", property = "email"),
            @Result(column = "phoneNum", property = "phoneNum"),
            @Result(
                    property = "roleList",
                    column = "id",
                    javaType = List.class,
                    many = @Many(select = "com.dao.RoleDao")
            )
    })
    List<User> findAll();

    @Insert("insert into sys_user values(#{id},#{username},#{email},#{password},#{phoneNum})")
    @Options(useGeneratedKeys = true, keyColumn = "id", keyProperty = "id")
    Long save(User user);

    @Insert("insert into sys_user_role values(#{userId},#{roleIds})")
    void saveUserRoleRel(@Param("userId") Long userId, @Param("roleId") Long roleId);

    @Delete("delete from sys_user_role where userId=#{userId}")
    void delUserRoleRel(@Param("userId") Long userId);

    @Delete("delete from sys_user where id=#{userId}")
    void del(@Param("userId") Long userId);

效果展示：

开发者涨薪指南

48位大咖的思考法则、工作方式、逻辑体系