檢查創建備份

我想學習JSP/Servlet的......我好不容易寫一個函數，整個數據庫的備份...檢查創建備份

package com.functions; 

import java.io.*; 
import java.io.IOException; 
//import java.sql.Connection; 
//import java.sql.PreparedStatement; 
//import java.sql.ResultSet; 
//import javax.servlet.RequestDispatcher; 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 

//import com.functions.utility.DBConnector; 

public class addMarks3 extends HttpServlet { 

    private static final long serialVersionUID = 8097085789553030042L; 

    protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {  

     System.out.println("--------------------"); 
     System.out.println(" On Backup.java "); 
     System.out.println("--------------------"); 

      fetchDataFromDB(request,response); 
    } 

    private void fetchDataFromDB(HttpServletRequest request,HttpServletResponse response){ 


     try { 
      Runtime runtime = Runtime.getRuntime(); 
      File backupFile = new File("C:/Users/Rohan/Desktop/LMS/backup.sql"); 
      FileWriter fw = new FileWriter(backupFile); 
      Process child = runtime.exec("C:/Program Files (x86)/MySQL/MySQL Server 5.5/bin/mysqldump --user=root --password=root --lock-all-tables --opt dummy"); 
      InputStreamReader irs = new InputStreamReader(child.getInputStream()); 
      BufferedReader br = new BufferedReader(irs); 

      String line; 
      while((line=br.readLine()) != null) { 
       fw.write(line + "\n"); 
      } 
      fw.close(); 
      irs.close(); 
      br.close(); 
     } catch (IOException ex) { 
      ex.printStackTrace(); 
     } 

    } 
}

我仍然無法弄清楚如何驗證備份是否成功.. ?? 如何檢查備份是否成功？

PS：該文件沒有得到填充，每次我運行它....

來源

2011-09-16 John

試試這個。檢查文件大小。

File backupFile = new File("C:/Users/Rohan/Desktop/LMS/backup.sql"); 
int len1=backupFile.length(); 
FileWriter fw = new FileWriter(backupFile); 

Process child = runtime.exec("C:/Program Files (x86)/MySQL/MySQL Server 5.5/bin/mysqldump --user=root --password=root --lock-all-tables --opt dummy"); 
     InputStreamReader irs = new InputStreamReader(child.getInputStream()); 
     BufferedReader br = new BufferedReader(irs); 
     String line; 
     while((line=br.readLine()) != null) { 
      fw.write(line + "\n"); 
     } 
     fw.close(); 
     irs.close(); 
     br.close(); 

     int len2=backupFile.length(); 

     int compare=len2-len1; 

      if(compare>0) 
      { 
      System.out.println("-- Backup done---"); 
      }

來源

2011-09-16 12:59:37

那麼，如果該文件被填充每次，並不意味着備份是成功的？

您是否考慮過將流處理流轉換爲響應流？

來源

2011-09-16 12:09:01

檢查創建備份

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