⭐ 欢迎来到虫虫下载站！ | 📦 资源下载 📁 资源专辑 ℹ️ 关于我们
⭐ 虫虫下载站
📤 上传资源

📄 survey.java

📁 这是另一部分..只是供大家参考下拉..到时候有什么不明白的可以
💻 JAVA
字号:
🔍 
// Survey.java

// This servlet processes the consumer electronics survey 
//  form, updating the file that stores the survey data 
//  and producing the current total votes in the survey.
//  The survey data file, survdat.dat, is stored on the Web server.

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class Survey extends HttpServlet {
    public void doPost(HttpServletRequest request,
                       HttpServletResponse response)
        throws ServletException, IOException {
        int votes[] = null;
        int index;
        int vote; 
        File survdat = new File("survdat.dat");
        String gender;
        String products[] = {"Conventional TV", "HDTV", "VCR",
                             "CD Player", 
                             "Mini CD player/recorder",
                             "DVD player", "Other"};

// Set the content type for the response output and get a writer

        response.setContentType( "text/html" ); 
        PrintWriter servletOut = response.getWriter();

// Produce the head of the output document
servletOut.println("<html><head>");
        servletOut.println(
            "<title> Return message </title></head><body>");

// Synchronize a block for the votes file access

        synchronized(this) {

// If the file already exists, read in its data

          try {
            if (survdat.exists()) {
              ObjectInputStream indat = new ObjectInputStream(
                              new FileInputStream(survdat));
              votes = (int []) indat.readObject();
              indat.close(); 
            }

// If the file does not exist (this is the first vote), create the 
//  votes array

            else
              votes = new int[14];
          }
          catch (Exception e) {e.printStackTrace();}

// Get the gender of the survey respondee

          gender = request.getParameter("gender");

// Add the consumer electronics vote of the response to the
//  votes array

          vote = Integer.parseInt(request.getParameter("vote"));
          if (gender.equals("male")) vote += 7;
          votes[vote]++;

// Write updated votes array to disk

          ObjectOutputStream outdat = new ObjectOutputStream(
              new FileOutputStream(survdat));
          outdat.writeObject(votes);
          outdat.flush();
          outdat.close();

        }  //** end of the synchronized block
// Create the initial response information
 
        servletOut.println(
            "<h3>Thank you for participating in the");
        servletOut.println(" Consumer Electronics Survey</h3>");
        servletOut.println("<h4>Current Survey Results:</h4>");

// Create the total votes return information for female respondents
      
        servletOut.println("<h5>For Female Respondents </h5>");
        for (index = 0; index < 7; index++) {
            servletOut.print(products[index]);
            servletOut.print(": ");
            servletOut.println(votes[index]);
            servletOut.println("<br />");
        }

 // Create the total votes return information for male respondents
      
        servletOut.println("<h5>For Male Respondents </h5>");
        for (index = 7; index < 14; index++) {
            servletOut.print(products[index - 7]);
            servletOut.print(": ");
            servletOut.println(votes[index]);
            servletOut.println("<br />");
        }     
        servletOut.close();
    }
 }

⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -