Web在线聊天室(完结) --- 注册用户+ip地址

Posted 2022-12-04 满眼*星辰

注册用户

• 注册用户
• • 接口设计
  • 前端异步回调ajax函数
  • 编写servlet实现注册业务逻辑
  • 操作数据库插入新用户
  • 实现效果
• 项目发布地址

注册用户

接口设计

请求:
POST /register

	name: xxx,
	password: xxx,
	nickName: "蔡徐坤",
	signature: "我擅长唱跳rap篮球",

响应:
HTTP/1.1 200 OK

	ok: 1,
	reason: xxx

前端异步回调ajax函数

        register()
          $.ajax(
            url: 'register',
            type: 'post',
            contentType: 'application/json',
            data: JSON.stringify(
              name: app.registerForm.inputUsername,
              password: app.registerForm.inputPassword,
              nickName: app.registerForm.inputNickName,
              signature: app.registerForm.inputSignature,
            ),
            success: function(data, status) 
              if (!data.ok) 
                alert('注册失败! ' + data.reason);
                return;
              else 
                alert("恭喜你，注册成功！")
              
              app.registerForm.showDialog = false;
              app.login.showLoginDialog = true;
            
          )
        

编写servlet实现注册业务逻辑

package org.example.servlet;

import org.example.dao.UserDao;
import org.example.exception.AppException;
import org.example.model.User;
import org.example.util.Util;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.sql.Timestamp;

/**
 * Created with IntelliJ IDEA.
 * Description:注册
 * User: starry
 * Date: 2021 -05 -31
 * Time: 16:09
 */

@WebServlet("/register")
public class RegisterServlet extends HttpServlet 

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException 

    

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException 
        req.setCharacterEncoding("UTF-8");
        resp.setCharacterEncoding("UTF-8");
        resp.setContentType("application/json");
        User user = new User();
        try 
            //1. 解析请求数据：根据接口文档，需要使用反序列化操作
            User input = Util.deserialize(req.getInputStream(),User.class);
            //2. 业务处理：数据库验证账号密码，如果验证通过，创建session，保存用户信息
            if (input.getName() == null || input.getName().equals("")) 
                throw new AppException("用户名为空");
            
            if (input.getPassword() == null || input.getPassword().equals("")) 
                throw new AppException("密码为空");
            
            if (input.getNickName() == null || input.getNickName().equals("")) 
                throw new AppException("昵称为空");
            
            int result = UserDao.insertUser(input);
            user = input;
            //构造操作成功的正常返回数据：ok-true，业务字段
            user.setOk(true);
        catch (Exception e) 
            e.printStackTrace();
            //构造操作失败的错误信息：ok-false，reason：错误信息
            user.setOk(false);
            //自定义异常，自己抛，为中文信息，可以给用户看
            if (e instanceof AppException)     //e捕获到的异常是不是自定义异常
                user.setReason(e.getMessage());
            else  //非自定义异常，英文信息，给前端看“未知错误”
                user.setReason("未知的错误，请联系管理员");
            
        
        //3. 返回响应数据：从响应对象获取输出流，打印输出到响应体body中
        resp.getWriter().println(Util.serialize(user));
    

操作数据库插入新用户

    /**
     * 插入注册用户
     */
    public static int insertUser(User input) 
        Connection connection = null;
        PreparedStatement statement = null;
        try 
            connection = Util.getConnection();
            String sql = "insert user(name,password,nickName,iconPath,signature,lastLogout) values(?,?,?,?,?,?)";
            statement = connection.prepareStatement(sql);
            statement.setString(1,input.getName());
            statement.setString(2,input.getPassword());
            statement.setString(3,input.getNickName());
            statement.setString(4,"");
            statement.setString(5,input.getSignature());
            Timestamp time = new Timestamp(System.currentTimeMillis());
            statement.setTimestamp(6,time);

            //将注册用户返回给前端的数据修改一下
            input.setIconPath("");
            input.setLastLogout(time);

            return statement.executeUpdate();
        catch (Exception e) 
            throw new AppException("插入注册用户失败",e);
        finally 
            Util.close(connection,statement);
        
    

实现效果

哪一栏没写会提醒 ：注册失败+原因

点击注册后，显示注册成功

接下来登录duoduo账号，可以登录

项目发布地址

http://82.156.229.239:8080/java_chatroom/

欢迎小伙伴们点进来看看呀🤗