SERVLET如何从上一个页面取得参数(2)

最新推荐文章于 2025-07-14 12:12:47 发布

原创最新推荐文章于 2025-07-14 12:12:47 发布 · 164 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#servlet

Servlet 专栏收录该内容

10 篇文章

订阅专栏

本文介绍了一个使用HTML表单收集用户输入并通过GET方法发送到服务器端的例子。Servlet接收这些参数并展示所有请求参数及其对应的值。此示例展示了如何通过Java Servlet处理HTTP请求中的表单数据。


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
  <TITLE>A Sample FORM using POST</TITLE>
</HEAD>
<BODY BGCOLOR="#FDF5E6">
<H1 ALIGN="CENTER">A Sample FORM using POST</H1>

<FORM ACTION="servlet/ShowParameters" 
      METHOD="get">
  Item Number: <INPUT TYPE="TEXT" NAME="itemNum"><BR>
  Quantity: <INPUT TYPE="TEXT" NAME="quantity"><BR>
  Price Each: <INPUT TYPE="TEXT" NAME="price" VALUE="$"><BR>
  <HR>
  First Name: <INPUT TYPE="TEXT" NAME="firstName"><BR>
  Last Name: <INPUT TYPE="TEXT" NAME="lastName"><BR>
  Middle Initial: <INPUT TYPE="TEXT" NAME="initial"><BR>
  Shipping Address:
  <TEXTAREA NAME="address" ROWS=3 COLS=40></TEXTAREA><BR>
  Credit Card:<BR>
    <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>


import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;

//获取所有的参数

public class ShowParametersMap extends HttpServlet {
	public 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)");
		Map<String, String[]> paramMap = request.getParameterMap();
		Set<Map.Entry<String, String[]>> entries = paramMap.entrySet(); 
		for(Iterator<Map.Entry<String, String[]>> it = entries.iterator(); it.hasNext(); ) {
			Map.Entry<String, String[]> entry = it.next();
			String paramName = entry.getKey();
			out.print("<TR><TD>" + paramName + "\n<TD>");
			String[] paramValues = entry.getValue();
			if (paramValues.length == 1) {
				String paramValue = paramValues[0];
				if (paramValue.length() == 0)
					out.println("<I>No Value</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>");
			}
		}
		out.println("</TABLE>\n</BODY></HTML>");
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		doGet(request, response);
	}
}