java備份以及還原mysql數據庫

參考：http://xp84012493.iteye.com/blog/199290

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：備份以及還原mysql數據庫
 * 需要將mysql安裝的bin目錄C:\Program Files\MySQL\MySQL Server 5.5\bin設置到環境變量，否則不知道怎麼調用mysqldump[⊙﹏⊙b汗]
 * 用java備份的話，不能使用">"了，所以調用cmd命令時，需要更改裏面的參數
 * 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 BackupsDB {

    /**
     * 備份mysql數據庫
     * @param root  mysql登錄名
     * @param rootPass  登錄密碼
     * @param dbName  要備份的數據庫名稱
     * @param backupsPath  備份的路徑
     * @param backupsSqlFileName  備份文件的名字
     * @return
     */
    public static String dbBackUp(String root,String rootPass,String dbName,String backupsPath,String backupsSqlFileName)
    {
        //生成臨時備份文件
//      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命令爲：——>>>"+sbs.toString());
            Runtime runtime = Runtime.getRuntime();
            Process child = runtime.exec(sbs.toString());

            //讀取備份數據並生成臨時文件
            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("數據庫已備份到——>>"+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();
    }

    /**
     * 備份erp數據庫到D:db.sql
     * @return
     */
    public static boolean backup() {//備份
        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);
            // 調用 mysql 的 cmd:
            Process child = rt
            .exec("cmd /c "+mysql);// 設置導出編碼爲utf8。這裏必須是utf8

            // 把進程執行中的控制檯輸出信息寫入.sql文件，即生成了備份文件。注：如果不對控制檯信息進行讀出，則會導致進程堵塞無法運行
            InputStream in = child.getInputStream();// 控制檯的輸出信息作爲輸入流

            InputStreamReader xx = new InputStreamReader(in, "utf8");// 設置輸出流編碼爲utf8。這裏必須是utf8，否則從流中讀入的是亂碼

            String inStr;
            StringBuffer sb = new StringBuffer("");
            String outStr;
            // 組合控制檯輸出信息字符串
            BufferedReader br = new BufferedReader(xx);
            while ((inStr = br.readLine()) != null) {
                sb.append(inStr + "\r\n");
            }
            outStr = sb.toString();

            // 要用來做導入用的sql目標文件：
            FileOutputStream fout = new FileOutputStream(
                    "D:/db.sql");
            OutputStreamWriter writer = new OutputStreamWriter(fout, "utf8");
            writer.write(outStr);
            // 注：這裏如果用緩衝方式寫入文件的話，會導致中文亂碼，用flush()方法則可以避免
            writer.flush();

            // 別忘記關閉輸入輸出流
            in.close();
            xx.close();
            br.close();
            writer.close();
            fout.close();

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

            String error="備份成功!";

        } catch (Exception e) {
            e.printStackTrace();
        }

        return true;
    }

    /**
     * 還原D:db.sql到erp數據庫
     * @return
     */
    public static boolean load() {//還原
        try {
            String fPath = "D:/db.sql";
            Runtime rt = Runtime.getRuntime();

            // 調用 mysql 的 cmd:
            Process child = rt.exec("mysql -uroot -proot erp ");
            OutputStream out = child.getOutputStream();//控制檯的輸入信息作爲輸出流
            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：這裏如果用緩衝方式寫入文件的話，會導致中文亂碼，用flush()方法則可以避免
            writer.flush();
            // 別忘記關閉輸入輸出流
            out.close();
            br.close();
            writer.close();

            System.out.println("/* Load OK! */");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return true;
    }
}