📄 helloworld.java
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import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
/**
* <p>Title: 使用servlet输出Html页面</p>
* <p>Description: HelloWorld实例书写html页面，初始化参数定义在web.xml文件中</p>
* <p>Copyright: Copyright (c) 2003</p>
* <p>Filename: HelloWorld.java</p>
* @author 杜江
* @version 1.0
*/
//必须继承HttpServlet类
public class HelloWorld extends HttpServlet {
String defaultGreeting;
String defaultName;
String ICO1;
String ICO2;
String ICO3;
String ICO4;
//初始化
public void init(ServletConfig config) throws ServletException
{
super.init(config);
//获取参数
if ((defaultName = getInitParameter("name")) == null)
defaultName = "Java";
if ((defaultGreeting = getInitParameter("message")) == null)
defaultGreeting = "Hello World!";
if ((ICO1 = getInitParameter("ICO1")) == null)
ICO1 = "images/commend4.gif";
if ((ICO2 = getInitParameter("ICO2")) == null)
ICO2 = "images/commend.gif";
if ((ICO3 = getInitParameter("ICO3")) == null)
ICO3 = "images/commend1.gif";
if ((ICO4 = getInitParameter("ICO4")) == null)
ICO4 = "images/commend3.gif";
}
/**
*<br>方法说明：生成HTML页面
*<br>输入参数：
*<br>返回类型：
*/
public void service(HttpServletRequest req, HttpServletResponse res)
throws IOException
{
// 首先设置文档类型
res.setContentType("text/html; charset=GB2312");
// 获取输出流
PrintWriter out = res.getWriter();
//书写页面
out.println("<html><head><title>欢迎进入Java世界</title></head>");
out.println("<body>");
out.println("<h1>");
out.println(defaultName + " " + defaultGreeting + "!");
out.println("</h1>");
out.println("<ul>");
out.println("<li><img src=\""+ICO1+"\">");
out.println("<li><img src=\""+ICO2+"\">");
out.println("<li><img src=\""+ICO3+"\">");
out.println("<li><img src=\""+ICO4+"\">");
out.println("</ul>");
out.println("</body></html>");
}
}
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