MySQL数据库备份与还原

MySQL数据库备份与还原

今天就分享代码，大家回去看看研究下！

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.text.SimpleDateFormat;

import java.util.Date;

/**

* 功能：备份以及还原mysql数据库

* 需要将mysql安装的bin目录C:\Program Files\MySQL\MySQL Server 5.5\bin设置到环境变量，否则不知道怎么调用mysqldump[⊙﹏⊙b汗]

* 用java备份的话，不能使用">"了，所以调用cmd命令时，需要更改里面的参数

* mysqldump -h127.0.0.1 -uroot -proot erp > backupfile.sql

* mysqldump -h 127.0.0.1 -u root -proot erp --default-character-set=utf8 --result-file=D:backupfile.sql

* @author Administrator

*

*/

public class mysql {

/**

* 备份mysql数据库

* @param root mysql登录名

* @param rootPass 登录密码

* @param dbName 要备份的数据库名称

* @param backupsPath 备份的路径

* @param backupsSqlFileName 备份文件的名字

* @return

*/

public static String dbBackUp(String root,String rootPass,String dbName,String backupsPath,String backupsSqlFileName)

{

//生成临时备份文件

// SimpleDateFormat sd=new SimpleDateFordckupsSqlFileName;

String pathSql = backupsPath+backupsSqlFileName;

try {

File fileSql = new File(pathSql);

if(!fileSql.exists()){

fileSql.createNewFile();

}

StringBuffer sbs = new StringBuffer();

sbs.append("mysqldump ");

sbs.append(" -h 127.0.0.1 ");

sbs.append(" -u ");

sbs.append(root+" ");

sbs.append("-p"+rootPass+" ");

sbs.append(dbName);

sbs.append(" --default-character-set=utf8 ");

// sbs.append(">"+pathSql);

sbs.append(" --result-file="+pathSql);

System.out.println("cmd命令为：——>>>"+sbs.toString());

Runtime runtime = Runtime.getRuntime();

Process child = runtime.exec(sbs.toString());

//读取备份数据并生成临时文件

InputStream in = child.getInputStream();

OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(pathSql), "utf8");

BufferedReader reader = new BufferedReader(new InputStreamReader(in, "utf8"));

String line=reader.readLine();

while (line != null) {

writer.write(line+"\n");

line=reader.readLine();

}

writer.flush();

System.out.println("数据库已备份到——>>"+pathSql);

} catch (Exception e) {

}

return pathSql;

}

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

//mysqldump -h 192.168.110.10 --user=root --password=fortune123 --lock-all-tables=true --result-file=D:tt.sql\ --default-character-set=utf8 ERP

SimpleDateFormat sd=new SimpleDateFormat("yyyyMMddHHmmss");

String root = "root";

String rootPass = "root";

String dbName = "erp";

String backupsPath = "D:";

String backupsSqlFileName = "erpDB_"+sd.format(new Date())+".sql";

dbBackUp(root, rootPass, dbName, backupsPath, backupsSqlFileName);

backup();

load();

}

/**

* 备份erp数据库到D:db.sql

* @return

*/

public static boolean backup() {//备份

try {

Runtime rt = Runtime.getRuntime();

String mysql = "mysqldump -uroot -proot erp --default-character-set=utf8 ";

// mysql ="C:\\Program Files\\MySQL\\MySQL Server 5.5\\bin\\"+mysql;

System.out.println("mysql=============>>>>"+mysql);

// 调用 mysql 的 cmd:

Process child = rt

.exec("cmd /c "+mysql);// 设置导出编码为utf8。这里必须是utf8

// 把进程执行中的控制台输出信息写入.sql文件，即生成了备份文件。注：如果不对控制台信息进行读出，则会导致进程堵塞无法运行

InputStream in = child.getInputStream();// 控制台的输出信息作为输入流

InputStreamReader xx = new InputStreamReader(in, "utf8");// 设置输出流编码为utf8。这里必须是utf8mssql数据库还原，否则从流中读入的是乱码

String inStr;

StringBuffer sb = new StringBuffer("");

String outStr;

// 组合控制台输出信息字符串

BufferedReader br = new BufferedReader(xx);

while ((inStr = br.readLine()) != null) {

sb.append(inStr + "\r\n");

}

outStr = sb.toString();

// 要用来做导入用的sql目标文件：

FileOutputStream fout = new FileOutputStream(

"D:/db.sql");

OutputStreamWriter writer = new OutputStreamWriter(fout, "utf8");

writer.write(outStr);

// 注：这里如果用缓冲方式写入文件的话，会导致中文乱码，用flush()方法则可以避免

writer.flush();

// 别忘记关闭输入输出流

in.close();

xx.close();

br.close();

writer.close();

fout.close();

System.out.println("/* Output OK! */");

String error="备份成功!";

} catch (Exception e) {

e.printStackTrace();

}

return true;

}

/**

* 还原D:db.sql到erp数据库

* @return

*/

public static boolean load() {//还原

try {

String fPath = "D:/db.sql";

Runtime rt = Runtime.getRuntime();

// 调用 mysql 的 cmd:

Process child = rt.exec("mysql -uroot -proot erp ");

OutputStream out = child.getOutputStream();//控制台的输入信息作为输出流

String inStr;

StringBuffer sb = new StringBuffer("");

String outStr;

BufferedReader br = new BufferedReader(new InputStreamReader(

new FileInputStream(fPath), "utf8"));

while ((inStr = br.readLine()) != null) {

sb.append(inStr + "\r\n");

}

outStr = sb.toString();

OutputStreamWriter writer = new OutputStreamWriter(out, "utf8");

writer.write(outStr);

// 注：这里如果用缓冲方式写入文件的话，会导致中文乱码，用flush()方法则可以避免

writer.flush();

// 别忘记关闭输入输出流

out.close();

br.close();

writer.close();

System.out.println("/* Load OK! */");

} catch (Exception e) {

e.printStackTrace();

}

return true;

}

}

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