Ajax实现登录案例_AJAX相关_

 package com.lbl.msg; public class Msg { String msg; int code; public Msg() { } public Msg(String msg, int code) { this.msg = msg; this.code = code; } public String getMsg() { return msg; } public void setMsg(String msg) { this.msg = msg; } public int getCode() { return code; } public void setCode(int code) { this.code = code; } }

 package com.lbl.servlet; import com.fasterxml.jackson.databind.ObjectMapper; import com.lbl.msg.Msg; 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 java.io.IOException; @WebServlet("/register") public class RegisterServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1:获取请求发送的数据 String username = request.getParameter("username"); response.setContentType("text/html;charset=UTF-8"); //2:判断用户名是否注册 if("abc123".equals(username)){ Msg msg = new Msg("用户名已经注册",0); //用户名已经注册 {"flag":false,"info":"用户名已经注册"}; // String jsonStr = "{\"flag\":false,\"info\":\"用户名已经注册\"}"; //响应回浏览器 response.getWriter().write(new ObjectMapper().writeValueAsString(msg)); }else{ Msg msg = new Msg("可以注册",1); //用户名没有注册 // String jsonStr = "{\"flag\":true,\"info\":\"可以注册\"}"; //响应回浏览器 response.getWriter().write(new ObjectMapper().writeValueAsString(msg)); } } }

会员注册USER REGISTER 
用户名
密码