demo_3

##　　控制器层

需求分析：

访问路径：`/user/reg.do`
请求参数：`username=xx&password=xx&&phone=xx&email=xx`
请求类型：`POST`
响应内容：`JSON`

在`pom.xml`中添加对`Jackson`的依赖：

    <!-- jackson -->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.9.6</version>
    </dependency>

对于JSON的解释

创建专门用于响应给客户端的JSON数据的类`com.demo.pojo.ResponseResult`

package com.demo.pojo;

import java.io.Serializable;

public class ResponseResult<T> implements Serializable {

    /**
     * 
     */
    private static final long serialVersionUID = -8070114279101787255L;

    private static final int STATE_SUCCESS = 1;
    private static final int STATE_ERROR = 0;

    private Integer state;// 成功（1）或失败（0）
    private String message;// 当失败时封装错误信息
    private T data;// 数据

    public ResponseResult() {
        super();
        // TODO Auto-generated constructor stub
    }

    public ResponseResult(Integer state) {
        super();
        this.state = state;
    }

    public ResponseResult(Integer state, String message) {
        super();
        this.state = state;
        this.message = message;
    }

    /**
     * 状态成功
     * 
     * @param state 1
     * @param data  数据
     */
    public ResponseResult(Integer state, T data) {
        super();
        this.state = STATE_SUCCESS;
        this.data = data;
    }

    /**
     * 状态失败
     * 
     * @param throwable 返回异常
     */
    public ResponseResult(Throwable throwable) {
        super();
        this.state = STATE_ERROR;
        this.message = throwable.getMessage();
    }

    public Integer getState() {
        return state;
    }

    public void setState(Integer state) {
        this.state = state;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }

    public static long getSerialversionuid() {
        return serialVersionUID;
    }

    public static int getStateSuccess() {
        return STATE_SUCCESS;
    }

    public static int getStateError() {
        return STATE_ERROR;
    }

    @Override
    public String toString() {
        return "ResponseResult [state=" + state + ", message=" + message + ", data=" + data + "]";
    }

}

 ##　　在IUserService业务层添加登陆接口

/**
     * 用户登录
     * @param username 用户名
     * @param password 密码
     * @return 成功登录的用户名
     * @throws UsernameNotExistsException
     * @throws PasswordNotMatchException
     */
    User login(String username,String password);

在UserServiceImpl类实现

public User login(String username, String password) {
        // 根据用户名查询用户信息
        User user = findUserByUsername(username);
        // 判断是否查询到匹配的用户信息
        if (user == null) {
            // 没有则抛出异常，用户名不存在UsernameNotExistsException
            throw new UsernameNotExistsException("尝试登陆的用户名" + username + "不存在！");
        } else {
            // 获取该用户的盐(UUID)
            String salt = user.getUuid();
            // 基于盐，对用于输入的密码（方法的参数）进行加密
            String md5Password = getEncrpytedPassword(password, salt);
            // 判断加密后的密码，与获取的用户信息中的密码是否匹配
            if (user.getPassword().equals(md5Password)) {
                // 返回查询到的User对象
                return user;
            } else {
                // 不匹配则抛出异常，密码错误PasswordNotMatchException
                throw new PasswordNotMatchException("您输入的用户名或密码不正确");
            }
        }
    }

创建控制器类`com.demo.controller.UserController`，使用`@Controller`注解，并添加`@RequestMapping("/user")`注解。

在这个类中添加`public ResponseResult<Void> handleReg()`方法以处理请求，该方法使用`@RequestMapping(value="/reg.do",method=RequestMethod.POST)`注解，并添加`@ResponseBody`注解。

 

package com.demo.controller;

import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import com.demo.pojo.ResponseResult;
import com.demo.pojo.User;
import com.demo.service.IUserService;
import com.demo.service.ex.ServiceException;
import com.demo.service.ex.UsernameNotExistsException;

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

    // 访问注册页面
    @RequestMapping("/reg.do")
    public String showReg() {
        return "reg";
    }

    // 访问登录页面
    @RequestMapping("login.do")
    public String showLogin() {
        return "login";
    }

    /**
     * 将java数据转换为JSON串类型
     * 
     * @param username
     * @param password
     * @param phone
     * @param email
     * @param session
     * @return 执行的数据
     */
    //处理注册信息
    @RequestMapping(value = "/handle_reg.do", method = RequestMethod.POST)
    @ResponseBody
    public ResponseResult<Void> handleReg(String username, String password, String phone, String email,
            HttpSession session) {
        ResponseResult<Void> rr;

        User user = new User();
        user.setUsername(username);
        user.setPassword(password);
        user.setPhone(phone);
        user.setEmail(email);

        try {
            User u = userService.reg(user);
            //绑定信息
            session.setAttribute("uid", u.getUsername());
            rr = new ResponseResult<Void>(ResponseResult.STATE_ERROR);
        } catch (UsernameNotExistsException e) {
            rr = new ResponseResult<Void>(e);
        }
        return rr;
    }
    /**
     * 
     * @param username
     * @param password
     * @param session
     * @return
     */
    //处理登录信息
    @RequestMapping(value = "/handle_login.do", method = RequestMethod.POST)
    @ResponseBody
    public ResponseResult<Void> handlerLogin(String username, String password, HttpSession session) {
        ResponseResult<Void> rr;
        try {
            User user = userService.login(username, password);
            //绑定信息
            session.setAttribute("uid", user.getId());
            session.setAttribute("username", user.getUsername());
            rr = new ResponseResult<Void>(ResponseResult.STATE_SUCCESS);
        } catch (ServiceException e) {
            rr = new ResponseResult<Void>(e);
        }
        return rr;
    }
}

 

编辑`/web/register.jsp`，测试完毕