?? surveyservlet.java
字號:
// ==================== Program Discription ==========================
// 程序名稱：示例14-4 : SurveyServlet.java
// 程序目的：處理Http Post的表單請求
// ==============================================================
package examples.servlets;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class SurveyServlet extends HttpServlet
{
String resultsDir;
public void init(ServletConfig config)
throws ServletException
{
super.init(config);
resultsDir = getInitParameter("resultsDir");
if (resultsDir == null) {
Enumeration initParams = getInitParameterNames();
System.err.println("The init parameters were: ");
while (initParams.hasMoreElements()) {
System.err.println(initParams.nextElement());
}
System.err.println("Should have seen one parameter name");
throw new UnavailableException (this,
"Not given a directory to write survey results!");
}
}
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
{
res.setContentType("text/html");
PrintWriter toClient = res.getWriter();
try {
//Open the file for writing the survey results.
String surveyName = req.getParameterValues("survey")[0];
FileWriter resultsFile = new FileWriter(resultsDir
+ System.getProperty("file.separator")
+ surveyName + ".txt", true);
PrintWriter toFile = new PrintWriter(resultsFile);
toFile.println("<BEGIN>");
Enumeration values = req.getParameterNames();
while(values.hasMoreElements()) {
String name = (String)values.nextElement();
String value = req.getParameterValues(name)[0];
if(name.compareTo("submit") != 0) {
toFile.println(name + ": " + value);
}
}
toFile.println("<END>");
//Close the file.
resultsFile.close();
// Respond to client with a thank you
toClient.println("<html>");
toClient.println("<title>Thank you!</title>");
toClient.println("<body bgcolor=#ffffff><p><img src=images/BEA_Button_Final_web.gif align=right>" +
"<font face=\"Helvetica\">" +
"Thank you for participating</font></body>");
toClient.println("</html>");
}
catch(IOException e) {
e.printStackTrace();
toClient.println("A problem occured while recording your answers. " +
"Please try again.");
}
}
}
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