📄 firstservlet.java
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import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
//必须继承HttpServlet类
public class FirstServlet 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/start_logoff.gif";
if ((ICO2 = getInitParameter("ICO2")) == null) ICO2 = "images/start_doc.gif";
if ((ICO3 = getInitParameter("ICO3")) == null) ICO3 = "images/start_find.gif";
if ((ICO4 = getInitParameter("ICO4")) == null) ICO4 = "images/start_shut.gif";
}
//<br>方法说明：生成HTML页面
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+"\">登陆");
out.println("<li><img src=\""+ICO2+"\">文档");
out.println("<li><img src=\""+ICO3+"\">查找");
out.println("<li><img src=\""+ICO4+"\">关闭");
out.println("</ul>");
out.println("</body></html>");
}
}
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