servlet基礎-hello world

一個簡單的servlet示例：

開發步驟：

1.在MyEclipse中創建一個web工程

2.在web.xml文件中添加過濾器：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
	xmlns="http://java.sun.com/xml/ns/j2ee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<servlet-name>hello</servlet-name>
<servlet-class>demo</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>hello</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
</web-app>

3.創建對應的demo類：

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 demo extends HttpServlet{
	public void service(HttpServletRequest request,HttpServletResponse response)
							throws ServletException,IOException{
		PrintWriter out = response.getWriter();
		out.println("hello world");
		out.close();
	}
}

4.在瀏覽器地址訪問：

http://127.0.0.1:8888/servletdemo/hello

頁面將會顯示：

hello world

至此，一個簡單的servlet示例演示完畢。