【图解+代码】前后台数据交互，方便纯前端程序员了解后台服务器处理

package cn.servlet; import java.io.IOException; import java.io.PrintWriter; 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 cn.dao.LoginDao; @WebServlet("/user/login") public class LoginServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //设置编码 response.setContentType("text/html;charset=utf-8"); System.out.println("doGet..."); //接收从浏览器页面提交到服务器的参数值 String name = request.getParameter("user");//input--> name System.out.println("name="+name); //处理值 LoginDao dao = new LoginDao(); boolean result = dao.check(name); //信息给返回到请求的地方 PrintWriter writer = response.getWriter(); if(result){ writer.write("账号正确"); }else{ writer.write("账号错误"); } writer.flush(); writer.close(); } }