Java在线备份和还原MySQL数据库。

　　今天整了整整一整天，终于使用Java在线备份和还原MySQL数据库了，哎，备份倒是很快，就是在还原的时候遇到了一个问题，也不报错，结果将sql语句放到cmd中一运行才知道是编码的问题，下面代码。

首先将将Mysql的环境变量配上：你的mysql安装目录\bin;，放到系统变量中path变量中，最好是开始Mysql的远程连接的功能，将mysql数据库中的user表中的你连接mysql的用户的host字段设置为%号。

package com.hancai.base.admin.action;

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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2011-12-21 :13:19　邓鸿飞

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