jsp 中servlet的自己实现
一 步骤
1、继承httpservlet
2、重写doget()或者dopost()方法
3、在web.xml中注册servlet
二 httpservlet类继承图
三 实例
1、创建myfirstservletdemo web project.
2、编辑index.jsp
<%@ page language="java" import="java.util.*" contenttype="text/html; charset=utf-8"%>
<%
string path = request.getcontextpath();
string basepath = request.getscheme()+"://"+request.getservername()+":"+request.getserverport()+path+"/";
%>
<!doctype html public "-//w3c//dtd html 4.01 transitional//en">
<html>
<head>
<base href="<%=basepath%>" rel="external nofollow" >
<title>my jsp 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" >
-->
</head>
<body>
<h1>第一个servlet小例子</h1>
<a href="servlet/helloservlet" rel="external nofollow" >get方式请求helloservlet</a>
<form action="servlet/helloservlet" method="post">
<input type="submit" value="post方式请求helloservlet">
</form>
</body>
</html>
3、编写helloservlet
package servlet;
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;
//继承于httpservlet
public class helloservlet extends httpservlet {
@override
protected void doget(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
// todo auto-generated method stub
system.out.println("处理get（）请求...");
printwriter out = response.getwriter();
response.setcontenttype("text/html; charset=utf-8");
out.println("<strong>hello servlet!</strong><br>");
}
@override
protected void dopost(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
system.out.println("处理post（）请求...");
printwriter out = response.getwriter();
response.setcontenttype("text/html; charset=utf-8");
out.println("<strong>hello servlet!</strong><br>");
}
}
4、编写web.xml
<?xml version="1.0" encoding="utf-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee";
xmlns:xsi="http://www.w3.org/2001/xmlschema-instance";
xsi:schemalocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd";>
<display-name></display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>helloservlet</servlet-name>
<servlet-class>servlet.helloservlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>helloservlet</servlet-name>
<url-pattern>/servlet/helloservlet</url-pattern>
</servlet-mapping>
</web-app>
四 运行结果
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