Posted on 2008-12-13 08:47
fcp 阅读(17400)
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j2ee
简单小程序，就是在页面里显示出POST或者GET
1，request.getMethod()，获得调用页面的方法
2，Enumeration<String> e = request.getParameterNames();接收所有的参数的名称，并且存在一个Enumeration里
3，parameterValue = request.getParameter(parameterName); 循环这句话，获取所有的参数的值
package com.fcp.web2;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ShowParameter extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = -3484338400290863566L;
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
this.printMethod(request, response);
this.printParameters(request, response);
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
this.printMethod(request, response);
this.printParameters(request, response);
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
private void printMethod(HttpServletRequest request, HttpServletResponse response) throws IOException
{
PrintWriter out = response.getWriter();
out.println("Method: " + request.getMethod() + "<br>");
}
private void printParameters(HttpServletRequest request, HttpServletResponse response) throws IOException
{
PrintWriter out = response.getWriter();
Enumeration<String> e = request.getParameterNames();
String parameterName, parameterValue;
while(e.hasMoreElements())
{
parameterName = e.nextElement();
parameterValue = request.getParameter(parameterName);
out.println(parameterName + ": " + parameterValue + "<br>");
}
}
}