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[原]HelloWorldServlet

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编译运行步骤:
1、将HelloWorldServlet.java编译成.class文件。
2、将HelloWorldServlet.class文件放到WEB-INF\classes\servlet目录下(servlet为自定义包目录)。
3、在WEB-INF\web.xml描述文件中,将的<web-app></web-app>标签中添加如下描述:
    <servlet>
      <servlet-name>HelloWorld</servlet-name>
      <servlet-class>servlet.HelloWorldServlet</servlet-class>
    </servlet>

    <servlet-mapping>
        <servlet-name>HelloWorld</servlet-name>
        <url-pattern>/helloworld</url-pattern>
    </servlet-mapping>
4、在浏览器中输入http://localhost:8080/helloworld即可。

HelloWorldServlet.java:
package servlet;

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

public class HelloWorldServlet 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>");
    }

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