从登录注册学习jdbc

项目目录

该目录下控制器使用LoginControllerPost，Object类使用User2，暂时不考虑sql注入、异常处理等，纯粹的入门

数据库格式类型

前台代码

		var loginParams = {
			"userName": this.ruleForm2.account, 
			"password": this.ruleForm2.checkPass,
			'sysId':'hello'
		};
		this.$http.post('/login2',loginParams,).then((res) => {
		  if (res.data.returnCode == '200') {
		     _this.$message({
		       message: '登陆成功',
		       type: 'success'
		     });
		   }
		 }

前台页面

返回的数据

后台代码

/**
*LoginControllerPost	控制器
*/
package com.example.demo22.controller;

import com.example.demo22.Object.User2;
import com.example.demo22.jdbcUtil.JdbcUtil;
import com.example.demo22.jsonUtil.JsonUtil;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import java.sql.ResultSet;
import java.util.ArrayList;

@RestController
public class LoginControllerPost {
    @PostMapping("/login2")
    public Object login(@RequestBody User2 user2){
        String username = user2.getUserName();
        String password = user2.getPassword();
        String sysId = user2.getSysId();
        String sql = "select * from user where userName='"+username+"'&&password='"+password+"'&&sysId='"+sysId+"'";
        JsonUtil json = new JsonUtil();
        ArrayList list = new ArrayList();
        try {
            ResultSet res = JdbcUtil.jdbc1(sql);
            if(res.next()){
                User2 user = new User2();
                user.setSysId(sysId);
                user.setId("1111");
                user.setUserName(username);
                user.setPassword(password);
                list.add(user);
                json.setRows(list);
                json.setTotal(1);
                json.setReturnCode("200");
                json.setReturnMsg("登录成功");
            }else{
                json.setReturnCode("500");
                json.setReturnMsg("账号或密码错误");
                json.setRows(new ArrayList());
            }
        } catch  (Exception e){
            e.printStackTrace();
        }finally{
            System.out.println(user2.getUserName());
            return json;
        }

    }
}

/**
*JdbcUtil类
*/
package com.example.demo22.jdbcUtil;

import javax.annotation.Resource;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

@Resource
public class JdbcUtil {
    private static final String URL = "jdbc:mysql://127.0.0.1:3306/test?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf-8";
    public static final String USER = "root";
    public static final String PASSWORD = "";

    public static ResultSet jdbc1(String sql) throws Exception {
        //1.加载驱动程序
        Class.forName("com.mysql.cj.jdbc.Driver");
        //2. 数据库连接
        Connection conn = DriverManager.getConnection(URL, USER, PASSWORD);
        //3.操作数据库
        Statement stmt = conn.createStatement();
        ResultSet rs = stmt.executeQuery(sql);
        return rs;
    }
}

/**
* User2类
*/
package com.example.demo22.Object;

public class User2 {
    String id;
    String userName;
    String password;
    String sysId;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getSysId() {
        return sysId;
    }

    public void setSysId(String sysId) {
        this.sysId = sysId;
    }
}

package com.example.demo22.jsonUtil;

import java.util.ArrayList;

public class JsonUtil {
    private String returnCode;
    private String returnMsg;
    private ArrayList rows;
    private int total;

    public void setReturnMsg(String returnMsg) {
        this.returnMsg = returnMsg;
    }

    public void setRows(ArrayList rows) {
        this.rows = rows;
    }

    public void setTotal(int total) {
        this.total = total;
    }

    public String getReturnMsg() {
        return returnMsg;
    }

    public ArrayList getRows() {
        return rows;
    }

    public int getTotal() {
        return total;
    }


    public String getReturnCode() {
        return returnCode;
    }

    public void setReturnCode(String returnCode) {
        this.returnCode = returnCode;
    }
}

总结

要想实现登录注册，首先前台要提交用户输入的账号密码到后台，后台接收参数去数据库查找，如果查找到了，那么就生成token，并返回相应的状态码和token到前台，前台作出相应的展示效果。