📄 helloworld2.java
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// ==================== Program Discription ==========================
// 程序名称：示例14-2: HelloWorld2.java
// 程序目的：编写带有参数的Servlet程序
// ==============================================================
package examples.servlets;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class HelloWorld2 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";
}
public void service(HttpServletRequest req, HttpServletResponse res)
throws IOException
{
// Check for a request parameter called "name." If the
// parameter exists (detected when the getParameterValues()
// method does not return null), use its value for the
// greeting.
String name, paramName[];
if ((paramName = req.getParameterValues("name"))
!= null) {
name = paramName[0];
}
else {
name = defaultName;
}
// Must set the content type first
res.setContentType("text/html");
// Now we can obtain a PrintWriter
PrintWriter out = res.getWriter();
out.println("<html><head><title>Hello World3.java</title></head>");
out.println("<body>");
out.println("<p><img src=images/BEA_Button_Final_web.gif align=right>");
out.println("<h1>");
out.println(defaultGreeting + " " + name + "!");
out.println("</h1></body></html>");
// Do not close the output stream or print writer.
}
}
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