📄 formservlet.java
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import javax.servlet.*;import javax.servlet.http.*;import java.io.*;import java.util.*;/** * This servlet demonstrates how to service HTTP GET and POST requests. */public class FormServlet extends HttpServlet { /** * Process the HTTP Get request. */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // Identify this response as an HTML document response.setContentType("text/html"); PrintWriter out = response.getWriter(); // Start the HTML document out.println("<html>"); // Set the title of the document out.println("<head><title>FormServlet</title></head>"); // Start the document body out.println("<body>"); /** * print some information about the request */ // What protocol are we using? out.println("Using protocol: " + request.getProtocol() + "<br>"); // What URL was requested? out.println("The URL you requested is "); String my_url = // Add the scheme we're using (http) request.getScheme() + "://" + // Add the hostname and port the server is using request.getServerName() + ":" + request.getServerPort() + // Add the path to the servlet request.getServletPath(); out.println(my_url + "<br>"); // Print the requestor's IP address out.println("Your computer is " + request.getRemoteHost() + "<br>"); out.println("<hr>"); // Show all the headers Enumeration headerNames = request.getHeaderNames(); while (headerNames.hasMoreElements()) { String headerName = (String) headerNames.nextElement(); String headerValue = request.getHeader(headerName); out.println("Header:" + headerName + " = " + headerValue + "<br>"); } out.println("<hr>"); // Print a form asking for a name and a favorite color. // Note that the ACTION refers the form back to this servlet // and the method will be POST rather than GET. out.println("<FORM METHOD=\"post\" ACTION=\"" + my_url + "\">"); out.println("<br>"); out.println("What is your name: <INPUT TYPE=\"text\" NAME=\"name\" >"); out.println("<br>"); out .println("What is your favorite color: <INPUT TYPE=\"text\" NAME=\"color\" >"); out.println("<br>"); out.println("<INPUT TYPE=\"submit\" >"); out.println("<br>"); out.println("</FORM>"); out.println("</body></html>"); } /** * Process the HTTP POST request. This is called when the user submits the form. */ protected void doPost(HttpServletRequest request, HttpServletResponse response) throws javax.servlet.ServletException, java.io.IOException { // Identify this response as an HTML document response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<html>"); out.println("<head><title>FormServlet</title></head>"); out.println("<body>"); // Get the values for the "name" and "color" form parameters. out.println("Your name is " + request.getParameter("name") + "<br>"); out.println("Your favorite color is " + request.getParameter("color") + "<br>"); out.println("</body></html>"); } }⌨️ 快捷键说明
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