Vue调用后端java接口

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：

    
    
    
    
    
    
    
    



    
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