6.Spring SSM

一. Mybatis 与 Spring

思路:

1. 加载相关jar:mybtais +spring
   1. 数据–驱动—数据连接池
   2. mybatis核心–日志–连接桥梁
   3. spring 核心
2. 配置mybatis-SqlSessionFactory组件
   2. 连接池
   2. 关联mybatis个性化设置
   3. 关联mapper文件
   4. 扫描项目中类的别名 -
3. 配置事务
4. 配置mapper组件
5. 配置srevice组件

二. springMVC 与spring

思路:

1. 前端控制器
2. 配置编码过滤器
3. 引入spring配置文件

三.实战

• 步骤:
  1. 配置德鲁伊连接池
  2. 配置SqlSessionFactory
     1. ->连接池
     2. ->个性配置
     3. ->关联mapper.xml文件
     4. ->配置包的别名扫描
  3. 配置Mapper接口的代理对象
     1. ->配置SqlSession的来源,其实哪个SqlSessionFactory
     2. ->配置代理哪个接口
  4. 配置Service和事务(3W)

依赖jar包

DDL

CREATE TABLE `t_user` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `username` varchar(255) DEFAULT NULL,
  `password` varchar(255) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;

Mapper文件
UserMapper.xml

    
      insert into t_user (username,password,age)
      values (#{username},#{password},#{age});
    

    
      update t_user
      set
        username=#{username},
        age=#{age}
      where
        id=#{id}
    

    
      delete from t_user where id=#{id}
    

    
      select * from t_user where id=#{id};
    

    
      select * from t_user
    

Spring配置文件

applicationContext.xml

资源文件

db.properties

jdbc.url=jdbc:mysql:///ssm?useSSL=false
jdbc.username=root
jdbc.password=admin

mybatis文件

log4j.properties

#全局的日志配置
log4j.rootLogger=ERROR,stdout
#MyBatis的日志配置,打印哪些名称空间开头的日志
log4j.logger.cn.dusk.ssm.mapper=TRACE
#打印日志的地方
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

mvc

mvc.xml

mybatis.xml

登录控制器
LoginController

@Controller
public class LoginController {
    @RequestMapping("login")
    public String login(String username,String password,HttpSession session){
        if ("admin".equals(username) && "123".equals(password)){
            session.setAttribute("USER_IN_SESSION",username);
            return "forward:/user/list.do";
        }
        return "forward:/login.jsp";
    }
}

页面
UserController

@Controller
@RequestMapping("user")
public class UserController {
    @Autowired
    private IUserService userService;

    @RequestMapping("list")
    public String list(Model model){
        List list = userService.list();
        model.addAttribute("list",list);
        return "user/list";
    }
    @RequestMapping("input")
    public String input(Long id,Model model){
        if (id != null) {
            User user = userService.get(id);
            model.addAttribute("u",user);
        }
        return "user/input";
    }
    @RequestMapping("saveOrUpdate")
    public String saveOrUpdate(User u){
        if (u.getId() == null) {
            userService.save(u);
        }else{
            userService.update(u);
        }
        return "redirect:/user/list.do";
    }
    @RequestMapping("delete")
    public String delete(Long id){
        if (id != null) {
            userService.delete(id);
        }
        return "redirect:/user/list.do";
    }
}

实体类User

@Setter
@Getter
@ToString
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private Long id;
    private String username;
    private String password;
    private Integer age;
}

UserMapper

public interface UserMapper {
    void insert(User user);
    void updateByPrimaryKey(User user);
    void deleteByPrimaryKey(Long id);

    User selectByPrimaryKey(Long id);
    List selectAll();
}

服务接口
IUserService

public interface IUserService {
    void save(User user);
    void update(User user);
    void delete(Long id);
    User get(Long id);
    List list();
}

service实现类UserServiceImpl

@Service
public class UserServiceImpl implements IUserService {
    /**
     * 依赖mapper
     * session=factory.openSession();//先拿到sessionFactory
     * userMapper=session.getMapper(UserMapper.class);//在拿到代理对象
     */
    @Autowired
    private UserMapper userMapper;

    public void save(User user) {
        userMapper.insert(user);
    }

    public void update(User user) {
        userMapper.updateByPrimaryKey(user);
    }

    public void delete(Long id) {
        userMapper.deleteByPrimaryKey(id);
    }

    public User get(Long id) {
        User user = userMapper.selectByPrimaryKey(id);
        return user;
    }

    public List list() {
        List list = userMapper.selectAll();
        return list;
    }
}

控制器CheckLoginInterceptor

public class CheckLoginInterceptor extends HandlerInterceptorAdapter{
    /*在controller方法值前做拦截,返回true表示放行*/
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response,Object handler) throws IOException {
        //从session中获取当前登录成功的对象
        Object user = request.getSession().getAttribute("USER_IN_SESSION");
        //判断是否为null
        if (user == null) {
            //没有登录,返回到登录界面
            response.sendRedirect("/login.jsp");
            return false;
        }
        return true;//放行
    }
}

测试类
App

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class App {
    @Autowired
    private IUserService userService;

    @Test
    public void testSave(){
        User u = new User(null, "Dusk", "1234", 28);
        userService.save(u);
    }
    @Test
    public void testUpdate(){
        User u = new User(2L, "Dusk.Decade", "123123", 259);
        userService.update(u);
    }
    @Test
    public void testDelete(){
        userService.delete(1L);
    }
    @Test
    public void testGet(){
        User user = userService.get(1L);
        System.out.println(user);
    }
    @Test
    public void testList(){
        List list = userService.list();
        for (User user : list) {
            System.out.println(user);
        }

    }
}

添加或编辑列表
input.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    


    

        

        姓名:

        密码:

        年龄:

        

    

信息列表
list.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    


    新增

    编号---> 姓名---> 密码--->年龄---->操作

    
        

            ${u.id} ---> ${u.username} ---> ${u.password} ---> ${u.age}
            编辑
            删除
        
    

web.xml

    
        CharacterEncodingFilter
        org.springframework.web.filter.CharacterEncodingFilter
        
            encoding
            UTF-8
        
        
            forceEncoding
            true
        
    
    
        CharacterEncodingFilter
        /*
    
    
    
        mvc
        org.springframework.web.servlet.DispatcherServlet
        
            contextConfigLocation
            classpath:applicationContext.xml
        
        1
    
    
        mvc
        *.do
    

login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>


    


    

        账号:

        密码: