通常在MySQL數據庫的備份和恢復的時候,多是採用在cmd中執行mysql命令來實現。
例如:
mysqldump -h127.0.0.1 -uroot -p123456 test > d:/test.sql —備份test數據庫到 D 盤
mysql -h127.0.0.1 -uroot -p123456 test< test.sql —將D備份的數據庫腳本,恢復到數據庫中(數據庫要存在!)
在cmd調用命令行,其實是調用 mysql安裝路徑下面的bin目錄下面的 msqldump.exe和mysql.exe來完成相應的工作
所以,在java代碼中,我們也需要通過調用 mysqldump.exe和mysql.exe來完成備份和恢復的工作
Runtime.getRuntime().exec(String args); java調用外部軟件exe執行命令的api;
linux下:
String[] command = { “/bin/sh”, “-c”, command };
Process ps = Runtime.getRuntime().exec(command );
windows下:
String[] command = { “cmd”, “/c”, command};
RunTime.getRuntime().exec()運行腳本命令的介紹
數據庫備份具體代碼
Process ps = Runtime.getRuntime().exec(command );
package com.cxx.backupdb;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* @Author: cxx
* 數據庫備份與還原
* @Date: 2018/4/28 19:56
*/
public class DbOperate {
/**
* 備份數據庫db
* @param root
* @param pwd
* @param dbName
* @param backPath
* @param backName
*/
public static void dbBackUp(String root,String pwd,String dbName,String backPath,String backName) throws Exception {
String pathSql = backPath+backName;
File fileSql = new File(pathSql);
//創建備份sql文件
if (!fileSql.exists()){
fileSql.createNewFile();
}
//mysqldump -hlocalhost -uroot -p123456 db > /home/back.sql
StringBuffer sb = new StringBuffer();
sb.append("mysqldump");
sb.append(" -h127.0.0.1");
sb.append(" -u"+root);
sb.append(" -p"+pwd);
sb.append(" "+dbName+" >");
sb.append(pathSql);
System.out.println("cmd命令爲:"+sb.toString());
Runtime runtime = Runtime.getRuntime();
System.out.println("開始備份:"+dbName);
Process process = runtime.exec("cmd /c"+sb.toString());
System.out.println("備份成功!");
}
/**
* 恢復數據庫
* @param root
* @param pwd
* @param dbName
* @param filePath
* mysql -hlocalhost -uroot -p123456 db < /home/back.sql
*/
public static void dbRestore(String root,String pwd,String dbName,String filePath){
StringBuilder sb = new StringBuilder();
sb.append("mysql");
sb.append(" -h127.0.0.1");
sb.append(" -u"+root);
sb.append(" -p"+pwd);
sb.append(" "+dbName+" <");
sb.append(filePath);
System.out.println("cmd命令爲:"+sb.toString());
Runtime runtime = Runtime.getRuntime();
System.out.println("開始還原數據");
try {
Process process = runtime.exec("cmd /c"+sb.toString());
InputStream is = process.getInputStream();
BufferedReader bf = new BufferedReader(new InputStreamReader(is,"utf8"));
String line = null;
while ((line=bf.readLine())!=null){
System.out.println(line);
}
is.close();
bf.close();
} catch (IOException e) {
e.printStackTrace();
}
System.out.println("還原成功!");
}
public static void main(String[] args) throws Exception {
String backName = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss").format(new Date())+".sql";
DbOperate.dbBackUp("root","123456","ks","F:/",backName);
dbRestore("root","123456","db","F://2018-04-30-19-28-28.sql");
}
}