helloworld2.java

java的一系列产品中包括jsme,jmse,j2ee,本文件提供j2ee实现的源代码.

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

import examples.utils.common.ExampleUtils;

public class HelloWorld extends HttpServlet {
  
  String defaultGreeting;
  String defaultName;
  
  public void init(ServletConfig config) throws ServletException
  {
    super.init(config);
    
    if ((defaultGreeting = getInitParameter("greeting")) == null)
      defaultGreeting = "Hello";
    
    if ((defaultName = getInitParameter("person")) == null)
      defaultName = "World";
  }
  
  /**
   * A very simple implementation of the service method, in
   * which we output the contents of a static html page
   */
  public void service(HttpServletRequest req, HttpServletResponse res)
       throws IOException
  {
    // Must set the content type first
    res.setContentType("text/html");
    // Now we can obtain a PrintWriter
    PrintWriter out = res.getWriter();
    
    out.println(ExampleUtils.returnHtmlHeader("Hello World,Welcome!"));
    out.println("<h4>");
    out.println(defaultGreeting + " " + defaultName + "!");
    out.println("</h4>");
    out.println(ExampleUtils.returnHtmlFooter());
    // Do not close the output stream or print writer. 
  }
}