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通过request读取所有参数的练习

2015-11-27 18:26 344 查看 
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{

@Override
protected 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>");
}

}
}

@Override
protected 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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                         标签： 
                                                静态访问
                                                提交方式访问
                                                servlet
                                                

                        

                    


                

            


            

                
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