jquery ajax例子-白红宇

jquery ajax例子

阅读量：5782 次

发布时间：2019-06-18

本文共 3495 字，大约阅读时间需要 11 分钟。

（1）取得服务端当前时间

jquery对象.load(url,sendData,function(backData,textStatus,xhr){... ...})

load()：如果无参的话，就以GET方式发送

如果有参的话，就以POST方式发送

（2）检查注册用户名是否存在

$.get(url,sendData,function(backData,textStatus,xhr){... ...})

$.post(url,sendData,function(backData,textStatus,xhr){... ...})

getTime.jsp

1 <%@ page language="java" pageEncoding="UTF-8"%> 2  3  4    5        6    7    8        9       
     
10       
     
11           27   28

TimeServlet.java

1 package cn.itcast.web.servlet; 2  3 import java.io.IOException; 4 import java.text.DateFormat; 5 import java.util.Date; 6 import java.util.Locale; 7 import javax.servlet.ServletException; 8 import javax.servlet.http.HttpServlet; 9 import javax.servlet.http.HttpServletRequest;10 import javax.servlet.http.HttpServletResponse;11 12 public class TimeServlet extends HttpServlet {13     public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {14         DateFormat df = DateFormat.getDateTimeInstance(15                 DateFormat.FULL,16                 DateFormat.DEFAULT, 17                 Locale.CHINA);18         String now = df.format(new Date());19         response.setContentType("text/html;charset=UTF-8");20         response.getWriter().write(now);21     }22     public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {23         request.setCharacterEncoding("UTF-8");24         response.setContentType("text/html;charset=UTF-8");25         String ip = request.getRemoteAddr();26         if(ip.equals("127.0.0.1")){27             String username = request.getParameter("username");28             String password = request.getParameter("password");29             response.getWriter().write(username+":"+password);30         }31     }32 }

ajax_2.jsp 调用$.get()方法

1 <%@ page language="java" pageEncoding="UTF-8"%> 2  3  4    5        6    7    8     用户名[GET]： 9      40   41

ajax_3.jsp调用 $.post()方法

1 <%@ page language="java" pageEncoding="UTF-8"%> 2  3  4    5        6    7    8     用户名[POST]： 9     10      42   43

UserServlet.java

1 package cn.itcast.web.servlet; 2  3 import java.io.IOException; 4 import javax.servlet.ServletException; 5 import javax.servlet.http.HttpServlet; 6 import javax.servlet.http.HttpServletRequest; 7 import javax.servlet.http.HttpServletResponse; 8  9 public class UserServlet extends HttpServlet {10     public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {11         String username = request.getParameter("username");12         byte[] buf = username.getBytes("ISO8859-1");13         username = new String(buf,"UTF-8");14         String imagePath = "images/MsgSent.gif";15         if("哈哈".equals(username)){16             imagePath = "images/MsgError.gif";17         }18         response.setContentType("text/html;charset=UTF-8");19         response.getWriter().write(imagePath);20     }21     public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {22         request.setCharacterEncoding("UTF-8");23         String username = request.getParameter("username");24         String imagePath = "images/MsgSent.gif";25         if("哈哈".equals(username)){26             imagePath = "images/MsgError.gif";27         }28         response.setContentType("text/html;charset=UTF-8");29         response.getWriter().write(imagePath);30     }31 }

转载于:https://www.cnblogs.com/friends-wf/p/3810601.html

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