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JSP在页面加载时调用servlet的方法

2017-05-19 08:48 441 查看

方法：先在JS里面写一个调用servlet的事件（可以利用ajax），然后利用<body>标签的onload调用这个事件。

代码如下：

jsp文件代码如下：

<%@ 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" src="http://www.daimajiayuan.com/download/jquery/jquery-1.10.2.min.js"></script>
<script type="text/javascript" src="http://cdn.bootcss.com/bootstrap-select/2.0.0-beta1/js/bootstrap-select.js"></script>
<link rel="stylesheet" type="text/css" href="http://cdn.bootcss.com/bootstrap-select/2.0.0-beta1/css/bootstrap-select.css">


<link href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet">
<script src="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>


<script type="text/javascript">
function a(){
$.ajax({
url:"LoaddataServlet",//servlet文件的名称
type:"GET",
success:function(e){
alert("servlet调用成功！");
}
});

}
</script>
</head>
<body onload="a()">
</body>
</html>

servlet文件代码如下：

package com.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* Servlet implementation class LoaddataServlet
*/
@WebServlet(urlPatterns = "/LoaddataServlet",loadOnStartup = 1)
public class LoaddataServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public LoaddataServlet() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.getWriter().append("Served at: ").append(request.getContextPath());
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}

结果图：

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