效果：点击获取信息
testAjax.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
function getName(){
var xmlHttp;
//判断浏览器是否兼容
if(window.XMLHttpRequest){
xmlHttp = new XMLHttpRequest();
}else{
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlHttp.onreadystatechange = function(){
//判断返回状态
if(xmlHttp.readyState == 4 && xmlHttp.status == 200){
document.getElementById("name").value = xmlHttp.responseText;
}
}
xmlHttp.open("get","getAjaxName",true);
xmlHttp.send();
}
</script>
</head>
<body>
<div style="text-align:center;">
<input type="button" value="获取ajax信息" onclick="getName()"><input type="text" name="name" id="name">
</div>
</body>
</html>
GetAjaxNameServlet.java
package com.xxc.ajax;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class GetAjaxNameServlet extends HttpServlet{
/**
*
*/
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
this.doPost(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
out.println("返回的信息");
out.flush();
out.close();
}
}
web.xml
<servlet>
<servlet-name>GetAjaxNameServlet</servlet-name>
<servlet-class>com.xxc.ajax.GetAjaxNameServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>GetAjaxNameServlet</servlet-name>
<url-pattern>/getAjaxName</url-pattern>
</servlet-mapping>
原文地址：https://www.cnblogs.com/alex-xxc/p/10011283.html
时间： 2024-11-29 09:45:40