• 用JAVA实现MySQL数据库的备份和还原
  • 发布于 2个月前
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  • Zoker
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我们一般进行数据库的备份和还原都是直接使用数据库的相关管理工具进行实现,但是有些情况下我们可能没办法直接把这个数据库管理工具开放给用户使用,而只能给用户一个在线工具,让用户进行数据库的备份和还原操作,今天这篇文章就是介绍如何用JAVA实现MySQL数据库的备份和还原操作的,有需要开发类似数据库管理系统的同学可以参考一下。

直接看代码:

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
public class Test {
	public static void main(String[] args) throws IOException{
		backup("d:\\d.sql");
		recover("d:\\d.sql");
	}
	public static void backup(String path) throws IOException{
		Runtime runtime = Runtime.getRuntime();
		//-u后面是用户名,-p是密码-p后面最好不要有空格,-family是数据库的名字
		Process process = runtime.exec("mysqldump -u root -p123456 family");
		InputStream inputStream = process.getInputStream();//得到输入流,写成.sql文件
		InputStreamReader reader = new InputStreamReader(inputStream);
		BufferedReader br = new BufferedReader(reader);
		String s = null;
		StringBuffer sb = new StringBuffer();
		while((s = br.readLine()) != null){
			sb.append(s+"\r\n");
		}
		s = sb.toString();
		System.out.println(s);
		File file = new File(path);
		file.getParentFile().mkdirs();
		FileOutputStream fileOutputStream = new FileOutputStream(file);
		fileOutputStream.write(s.getBytes());
		fileOutputStream.close();
		br.close();
		reader.close();
		inputStream.close();
	}
	public static void recover(String path) throws IOException{
		Runtime runtime = Runtime.getRuntime();
		//-u后面是用户名,-p是密码-p后面最好不要有空格,-family是数据库的名字,--default-character-set=utf8,这句话一定的加
		//我就是因为这句话没加导致程序运行成功,但是数据库里面的内容还是以前的内容,最好写上完成的sql放到cmd中一运行才知道报错了
		//错误信息:
		//mysql: Character set 'utf-8' is not a compiled character set and is not specified in the '
		//C:\Program Files\MySQL\MySQL Server 5.5\share\charsets\Index.xml' file ERROR 2019 (HY000): Can't
		// initialize character set utf-8 (path: C:\Program Files\MySQL\MySQL Server 5.5\share\charsets\),
		//又是讨人厌的编码问题,在恢复的时候设置一下默认的编码就可以了。
		Process process = runtime.exec("mysql -u root -p123456 --default-character-set=utf8 family");
		OutputStream outputStream = process.getOutputStream();
		BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(path)));
		String str = null;
		StringBuffer sb = new StringBuffer();
		while((str = br.readLine()) != null){
			sb.append(str+"\r\n");
		}
		str = sb.toString();
		System.out.println(str);
		OutputStreamWriter writer = new OutputStreamWriter(outputStream,"utf-8");
		writer.write(str);
		writer.flush();
		outputStream.close();
		br.close();
		writer.close();
	}
}

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