java代码备份流程 java代码备份数据库

如何用java代码实现定时备份数据库表记录到

将MySql中的数据库导出到文件中 备份

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import java.io.*;

import java.lang.*;

public class BeiFen {

public static void main(String[] args) {

// 数据库导出

String user = "root"; // 数据库帐号

String password = "root"; // 登陆密码

String database = "test"; // 需要备份的数据库名

String filepath = "e:\\test.sql"; // 备份的路径地址

String stmt1 = "mysqldump " + database + " -u " + user + " -p"

+ password + " --result-file=" + filepath;

/*

* String mysql="mysqldump test -u root -proot

* --result-file=d:\\test.sql";

*/

try {

Runtime.getRuntime().exec(stmt1);

System.out.println("数据已导出到文件" + filepath + "中");

}

catch (IOException e) {

e.printStackTrace();

}

}

}

将数据从磁盘上的文本文件还原到MySql中的数据库

import java.io.*;

import java.lang.*;

/*

* 还原MySql数据库

* */

public class Recover {

public static void main(String[] args) {

String filepath = "d:\\test.sql"; // 备份的路径地址

//新建数据库test

String stmt1 = "mysqladmin -u root -proot create test";

String stmt2 = "mysql -u root -proot test " + filepath;

String[] cmd = { "cmd", "/c", stmt2 };

try {

Runtime.getRuntime().exec(stmt1);

Runtime.getRuntime().exec(cmd);

System.out.println("数据已从 " + filepath + " 导入到数据库中");

} catch (IOException e) {

e.printStackTrace();

}

}

}

如何用Java实现MySQL数据库的备份和恢复

MySQL的一些前台工具是有备份恢复功能的,可是如何在我们的应用程序中实现这一功能呢?本文提供了示例代码来说明如何使用Java代码实现MySQL数据库的备份恢复。

本次实现是使用了MySQL数据库本身提供的备份命令mysqldump和恢复命令mysql,在java代码中通过从命令行调用这两条命令来实现备份和恢复。备份和恢复所使用的文件都是sql文件。

本代码是参照网上某网友提供的源码完成的。

[java] view plaincopy

package xxx.utils;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.io.UnsupportedEncodingException;

/**

* MySQL数据库的备份与恢复 缺陷:可能会被杀毒软件拦截

*

* @author xxx

* @version xxx

*/

public class DatabaseBackup {

/** MySQL安装目录的Bin目录的绝对路径 */

private String mysqlBinPath;

/** 访问MySQL数据库的用户名 */

private String username;

/** 访问MySQL数据库的密码 */

private String password;

public String getMysqlBinPath() {

return mysqlBinPath;

}

public void setMysqlBinPath(String mysqlBinPath) {

this.mysqlBinPath = mysqlBinPath;

}

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public DatabaseBackup(String mysqlBinPath, String username, String password) {

if (!mysqlBinPath.endsWith(File.separator)) {

mysqlBinPath = mysqlBinPath + File.separator;

}

this.mysqlBinPath = mysqlBinPath;

this.username = username;

this.password = password;

}

/**

* 备份数据库

*

* @param output

* 输出流

* @param dbname

* 要备份的数据库名

*/

public void backup(OutputStream output, String dbname) {

String command = "cmd /c " + mysqlBinPath + "mysqldump -u" + username

+ " -p" + password + " --set-charset=utf8 " + dbname;

PrintWriter p = null;

BufferedReader reader = null;

try {

p = new PrintWriter(new OutputStreamWriter(output, "utf8"));

Process process = Runtime.getRuntime().exec(command);

InputStreamReader inputStreamReader = new InputStreamReader(process

.getInputStream(), "utf8");

reader = new BufferedReader(inputStreamReader);

String line = null;

while ((line = reader.readLine()) != null) {

p.println(line);

}

p.flush();

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

if (reader != null) {

reader.close();

}

if (p != null) {

p.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

/**

* 备份数据库,如果指定路径的文件不存在会自动生成

*

* @param dest

* 备份文件的路径

* @param dbname

* 要备份的数据库

*/

public void backup(String dest, String dbname) {

try {

OutputStream out = new FileOutputStream(dest);

backup(out, dbname);

} catch (FileNotFoundException e) {

e.printStackTrace();

}

}

/**

* 恢复数据库

*

* @param input

* 输入流

* @param dbname

* 数据库名

*/

public void restore(InputStream input, String dbname) {

String command = "cmd /c " + mysqlBinPath + "mysql -u" + username

+ " -p" + password + " " + dbname;

try {

Process process = Runtime.getRuntime().exec(command);

OutputStream out = process.getOutputStream();

String line = null;

String outStr = null;

StringBuffer sb = new StringBuffer("");

BufferedReader br = new BufferedReader(new InputStreamReader(input,

"utf8"));

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

sb.append(line + "/r/n");

}

outStr = sb.toString();

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

writer.write(outStr);

writer.flush();

out.close();

br.close();

writer.close();

} catch (UnsupportedEncodingException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

/**

* 恢复数据库

*

* @param dest

* 备份文件的路径

* @param dbname

* 数据库名

*/

public void restore(String dest, String dbname) {

try {

InputStream input = new FileInputStream(dest);

restore(input, dbname);

} catch (FileNotFoundException e) {

e.printStackTrace();

}

}

public static void main(String[] args) {

Configuration config = HibernateSessionFactory.getConfiguration();

String binPath = config.getProperty("mysql.binpath");

String userName = config.getProperty("connection.username");

String pwd = config.getProperty("connection.password");

DatabaseBackup bak = new DatabaseBackup(binPath, userName, pwd);

bak.backup("c:/ttt.sql", "ttt");

bak.restore("c:/ttt.sql", "ttt");

}

}

最后的main方法只是一个简单的使用方法的示例代码。

本人所做的项目是使用了hibernate的,而这里需要提供MySQL的bin路径和用户名、密码,而hibernate.cfg.xml中本身就是需要配置数据库的用户名和密码,所以我把MySQL的bin路径也直接配置到了这个文件里面,也不需要创建专门的配置文件,不需要写读取配置文件的接口了。

如果不明白,可以去看hibernate.cfg.xml的说明,里面是可以配置其他的property的

怎么用java备份mysql数据库?

首先,设置mysql的环境变量(在path中添加%MYSQL_HOME%\bin),重启电脑。

完整代码:

备份:

public static void main(String[] args) {

backup();

load();

}

public static void backup() {

try {

Runtime rt = Runtime.getRuntime();

// 调用 mysql 的 cmd:

Process child = rt

.exec("mysqldump -u root --set-charset=utf8 bjse act_obj");// 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utf8,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(

"e:/mysql-5.0.27-win32/bin/bjse22.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("");

} catch (Exception e) {

e.printStackTrace();

}

}

public static void load() {

try {

String fPath = "e:/mysql-5.0.27-win32/bin/bjse22.sql";

Runtime rt = Runtime.getRuntime();

// 调用 mysql 的 cmd:

Process child = rt.exec("mysql -u root bjse ");

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("");

} catch (Exception e) {

e.printStackTrace();

}

}

备份语句:

mysql SELECT * INTO OUTFILE "D:\\data\\db_testtemp.txt" fields terminated by ',

' from db_testtemp where std_state='1';

Query OK, 1 row affected (0.00 sec)

mysql SELECT * INTO OUTFILE "D:\\data\\db_testtemp.txt" fields terminated by ',

' from db_testtemp ;

Query OK, 2 rows affected (0.00 sec)

只生成一个只有数据的.txt:SELECT * INTO OUTFILE "D:\\data\\db_testtemp.txt" fields terminated by ',' lines terminated by '\r\n' from db_testtemp ;

只生成一个只有数据的.txt:mysqldump -uroot -pncae2010 -w "std_state='1'" -T D:\data --no-create-info --fields-terminated-by=, exam db_testtemp

生成一个创建数据库语句的.sql,一个只有数据的.txt:mysqldump -uroot -pncae2010 -w "std_state='1'" -T D:\data --fields-terminated-by=, exam db_testtemp

只生成insert语句:mysqldump -uroot -pncae2010 -w "std_state='1'" -t exam db_testtemp D:\data\a.sql

java 备份程序

import java.io.*;

public class MyCopy {

public static void main(String args[]){

try {

MyCopy j = new MyCopy(); j.CopyFile(new File(args[0]),new File(args[1]));

}

catch (Exception e) {

e.printStackTrace();

}

}

public void CopyFile(File in, File out) throws Exception {

FileInputStream fis = new FileInputStream(in);

FileOutputStream fos = new FileOutputStream(out);

byte[] buf = new byte[1024];

int i = 0;

while((i=fis.read(buf))!=-1) {

fos.write(buf, 0, i);

}

fis.close();

fos.close();

}

}

// 程序运行时的命令语法为:

// javac MyCopy.java (sourcefile) (destfile)

// java MyCopy.java c:\1.txt d:\1.txt

// 当然前提c盘1.txt 已存在。


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