Vue调用后端java接口的实例代码

日期：2020-08-12 栏目：前端经验浏览：次

前段时间做了个学校的春萌项目，其中用到vue连接后端java接口。

先上后端接口代码：

package controller;

import net.sf.json.JSONObject;
import util.DBUtil;

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.Connection;
import java.sql.Date;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

@WebServlet(name = "login",urlPatterns = "/login")
public class login extends HttpServlet {
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    HttpSession session = request.getSession(true);
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    DBUtil dbUtil = new DBUtil();
    Connection connection = dbUtil.getConnection();
    PreparedStatement preparedStatement;
    ResultSet rs;
    String psw="";
    String sql = "select password from `user` where username=?";
    try {
      preparedStatement = connection.prepareStatement(sql);
      preparedStatement.setInt(1,Integer.parseInt(username));
      rs = preparedStatement.executeQuery();
      while (rs.next()){
        psw = rs.getString("password");
      }
    }
    catch (Exception e){
      e.printStackTrace();
    }
    if (password.equals(psw)){
      session.setAttribute("username",username);
      response.getWriter().print("true");
    }
    else
    response.getWriter().print("false");
  }

  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

  }
}

前端调用：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Login</title>
  <script src="node_modules/vue/dist/vue.js"></script>
  <!--axios基于promise-->
  <script src="node_modules/axios/dist/axios.js"></script>
  <script src="login.js"></script>
  <script src="https://cdn.bootcss.com/vue-resource/1.5.1/vue-resource.min.js"></script>
  <link rel="stylesheet" href="login.css" rel="external nofollow" >
</head>
<body>
<div class="login_interface" id="interface_height">
  <img src="ic_login_logo.png" alt="" class="login_logo">
  <span id="login_head">智慧图书管理平台</span>
  <div class="login_input">
    <img src="ic_login_number.png" alt="" class="login_number">
    <input type="text" value="请输入账号" id="input_number" v-model="username">
  </div>
  <div class="login_input" id="add_top">
    <img src="ic_login_password.png" alt="" class="login_number">
    <input type="text" value="请输入密码" id="input_password" v-model="password">
  </div>
  <button class="login_unselected" id="tick"></button>
  <span id="remember_password">记住密码</span>
  <button id="registered_now"><a href=""><span style=" rel="external nofollow" color: grey">立即注册</span></a></button>
  <button id="login" @click="login()">登录</button>
</div>
<script>
  new Vue({
    el:'#interface_height',
    data:{
      username:'',
      password:''
    },
    methods:{
      login:function () {
        this.$http.post('login',{username:this.username,password:this.password},{emulateJSON:true}).then(function(res){
          console.log(res.data);
          window.location.href = 'index.html';
        },function(res){
          console.log(res.status);
        });
      }
    },
    created:function(){
    }
  })
</script>
</body>
</html>

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Vue调用后端java接口的实例代码

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