通过request读取所有参数的练习

来源：互联网发布：linux系统安全配置编辑：程序博客网时间：2024/05/22 19:24

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 ShowParameters extends HttpServlet{@Overrideprotected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {response.setContentType("text/html;charset=gb2312");PrintWriter out = response.getWriter();String title = "Reading all request Parameters";out.println("<html><head><title>读取所有参数</title></head>"+ "<BODY BGCOLOR='#FDF5E6'>\n" + "<H1 ALIGN=CENTER>" + title +"</H1>\n" + "<TABLE BORDER =1 ALIGN=CENTER>\n"+ "<TR BGCOLOR=\"#FFAD00\">\n" + "<TH>Parameter Name<TH>Parameter Value(s)");Enumeration paramNames = request.getParameterNames();//返回实现了接口的对象 while(paramNames.hasMoreElements()) {String paramName = (String) paramNames.nextElement();out.print("<TR><TD>" + paramName + "\n<TD>");String[] paramValues = request.getParameterValues(paramName);if(paramValues.length == 1) {String paramValue = paramValues[0];if(paramValue.length() ==0) {out.println("<I>No Values</I>");} else out.println(paramValue);} else {out.println("<UL>");for (int i=0; i<paramValues.length; i++) {out.println("<LI>" + paramValues[i]);}out.println("</UL>");}}}@Overrideprotected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doGet(request,response);}}

以上是通过request读取所有数据的示例程序

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitinal//EN"><HTML><HEAD><TITLE>A Sample FORM using POST</TITLE></HEAD><BODY BECOLOR="#FDF5E6"><H1 ALIGN="CENTER>A Sample FORM using POST</H1><FORM ACTION="servlet/ShowParameters"METHOD="get">Item Number:<INPUT TYPE="TEXT" NAEM="itemNum"><BR>Quantity: <INPUT TYPE="TEXT" NAEM="quantity"><BR>Price Each: <INPUT TYPE="TEXT" NAEM="price " VALUE="$"><BR><HR>First Name: <INPUT TYPE="TEXT" NAEM="firstName"><BR>Lase Name: <INPUT TYPE="TEXT" NAEM="lastName"><BR>Middle Initial: <INPUT TYPE="TEXT" NAEM="initial"><BR>Shipping Address:<TEXTAREA NAME="address" ROWS=3 COLS=40></TEXTAREA><BR>Credit Card:  <INPUT TYPE="RADIO" NAME="cardType" VALUE="Visa">Visa<BR>  <INPUT TYPE="RADIO" NAME="cardType" VALUE="Master Card">Master Card<BR>  <INPUT TYPE="RADIO" NAME="cardType" VALUE="Amex">American Express<BR>  <INPUT TYPE="RADIO" NAME="cardType" VALUE="Discover">Discover<BR>  <INPUT TYPE="RADIO" NAME="cardType" VALUE="Java SmartCard">Java SmartCard<BR>Credit Card Number:<INPUT TYPE="PASSWORD" NAME="cardNum"><BR>Repeat Credit Card Number:<INPUT TYPE="PASSWORD" NAME="cardNum"><BR><BR><CENTER><INPUT TYPE="SUBMIT" VALUE="Submit Order"></CENTER></FORM></BODY></HTML><span style="white-space:pre"></span>

该段程序的功能可以显示一个网页的静态文本的代码

可以通过以上两种方式访问网页

1.静态访问方式  http://127.0.0.1:8888/test/servlet/ShowParametersForm<span style="white-space:pre"></span>使用webapp的跟路径，后加文件名的方式2.使用提交的方式访问页面  http://127.0.0.1:8888/test/ShowParametersForm.htm

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