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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：
Login
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