📄 requestparam.java
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import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class RequestParam extends HttpServlet
{
public void doGet(HttpServletRequest request, HttpServletResponse
response)throws IOException, ServletException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>Post request parameters</title>");
out.println("</head>");
out.println("<body>");
out.println("<h3>This is Example of Posting request
parameters.</h3>");
//获取表单传递过来的参数值
String name=request.getParameter("yourname");
String age=request.getParameter("age");
//如果参数非空，则输出参数值
if(name!=null||age!=null)
{
out.println("<p>Name:"+name+"</p>");
out.println("<p>Age:"+age+"</p>");
}
//否则，显示空值信息
else
{
out.println("No Form Data Posted.");
}
//输出表单的HTML代码
out.println("<center>");
out.print("<form action=\"");
out.print("RequestParam\" ");
out.println("method=POST>");
out.println("<p>Name:<input type=text size=20 name=yourname></p>");
out.println("<p>Age:<input type=text size=20 name=age></p>");
out.println("<p><input type=submit></p>");
out.println("</form>");
out.println("</center>");
out.println("</body>");
out.println("</html>");
}
public void doPost(HttpServletRequest request, HttpServletResponse
response)throws IOException, ServletException
{
doGet(request,response);
}
}
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