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servlet使用实例

 
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java虚拟主机运行servlet时需要在调用路径前以“/servlet/”开头,请参考以下示例:示例中包括test.jsp、web.xml、HelloWorld.class三个文件,分别上传到站点目录下

/htdocs/test.jsp

/htdocs/WEB-INF/web.xml

/htdocs/WEB-INF/classes/HelloWorld.class

上传后访问 http://yourdomain/test.jsp 。

样例程序如下:


(1)web.xml的配置
<?xml version="1.0" ?>
<web-app>
<!-- HICHINA Servlet Test -->
<servlet>
<servlet-name>HelloWorld</servlet-name>
<servlet-class>HelloWorld</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>HelloWorld</servlet-name>
<url-pattern>/servlet/HelloWorld</url-pattern>
</servlet-mapping>
<!-- HICHINA Servlet Test -->
</web-app>

(2)test.jsp文件
<html>
<head>
<title>Hello JSP World!</title>
</head>
<body>
<h1>Hello, JSP World!</h1>
<p>The time now is : <%= new java.util.Date() %>.</p>
<p>To see the servlet example <a href="/servlet/HelloWorld">click here</a>.</p>
</body>
</html>

(3)HelloWorld.java源文件,需要您在本地编译成HellWorld.class
// Filename : HelloWorld.java
// Description : This servlet merely says hello!


import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class HelloWorld extends HttpServlet {

public void doGet ( HttpServletRequest request, HttpServletResponse response )
throws ServletException, IOException {

response.setContentType("text/html");
PrintWriter out = response.getWriter();

out.println("");
out.println("Hello, Cruel World!");
out.println("");
out.println("Hello, Cruel World !");
out.println("This is my first servlet.");
out.println("");
}// end doGet

}
//code end


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