写一个servlet打印Helloworld -优快云博客

本文通过一个简单的Servlet示例——HelloWorld，介绍了如何创建并部署Servlet应用。该示例使用了标准的Java Servlet API，并展示了基本的HTML输出。文章还提供了web.xml配置文件的内容，用于设置Servlet的映射路径。

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HelloWorld.java



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

public class HelloWorld extends HttpServlet { 

    public void doGet(HttpServletRequest request, HttpServletResponse response) 
    throws IOException, ServletException 
    { 
        response.setContentType("text/html"); 
        PrintWriter out = response.getWriter(); 
        out.println("<html>"); 
        out.println("<head>"); 
        out.println("<title>Hello World!</title>"); 
        out.println("</head>"); 
        out.println("<body>"); 
        out.println("<h1>Hello World!</h1>"); 
        out.println("</body>"); 
        out.println("</html>"); 
    } 
}

web.xml


<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN" "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
	<display-name>Servlet HelloWorld</display-name> 
    <description> 
      Servlet HelloWorld 
    </description> 
  <servlet> 
    <servlet-name>HelloWorld</servlet-name> 
    <servlet-class>HelloWorld</servlet-class> 
  </servlet> 
  <servlet-mapping> 
    <servlet-name>HelloWorld</servlet-name> 
    <url-pattern>/HelloWorld</url-pattern> 
  </servlet-mapping> 
</web-app>