Java 检查是否创建了备份
我正在尝试学习JSP/Servlets。。。我设法写了一个函数来备份整个数据库Java 检查是否创建了备份,java,database,jsp,jdbc,Java,Database,Jsp,Jdbc,我正在尝试学习JSP/Servlets。。。我设法写了一个函数来备份整个数据库 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; im
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();
}
}
}
我仍然不知道如何验证备份是否成功。。??
如如何检查备份是否成功
PS:每次我运行该文件时,都会填充它 那么,如果每次都填充该文件,这不意味着备份成功了吗
您是否考虑过将流程流传输到响应流?尝试这样做。检查文件大小
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---");
}