Java备份Oracle数据库

Java备份Oracle数据库  

Java线程、Process、ProcessBuilder

2010 年 6 月 20 日

文章内容描述了使用Java执行外部Oracle导出命令备份数据库功能的示例，依据此例子进行修改制造一些bug，然后将会对Java外部命令这块会有一个更加清晰的认知(个人观点仅供参考，不许拍砖，哈)

小细节

·试着把innerTh.start()这段给注释掉，然后再把用户名或密码写错。

·有些程序是不会在命令行有输出的，比如最直接的plsqldev.exe、MindManager.exe

·试着把将要执行的命令改成我们本地相关.exe程序，如上面所例或干脆TM.exe试试。

回页首

代码示例:

package org.ybygjy.basic.oracle; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.nio.ByteBuffer; import java.nio.channels.Channels; import java.nio.channels.FileChannel; import java.nio.channels.ReadableByteChannel; import java.util.ArrayList; import java.util.List; import java.util.Map; /** * java外部系统命令模式备份数据库 * @author WangYanCheng * @version 2010-6-19 */ public class BackupOracleDatabase { /** * 封装执行入口 */ public void doWork() { InnerClass innerInst = new InnerClass("DB_USER", "DB_PASS", "127.0.0.1:1521/ORCL", "E:/dbback/BACK201006.DMP"); Thread thInst = new Thread(innerInst); thInst.start(); } /** * 用于分担执行命令 * @author WangYanCheng * @version 2010-6-19 */ class InnerClass implements Runnable { /** 用户名 */ private String userName; /** 密码 */ private String userPass; /** 服务地址 */ private String serverAddr; /** 输出文件路径 */ private String outFilePath; /** * constructor * @param userName userName * @param userPass userPass * @param serverAddr 服务地址必须带<strong>端口</strong>/<strong>SID</strong> * @param outFilePath outPath */ public InnerClass(String userName, String userPass, String serverAddr, String outFilePath) { this.userName = userName; this.userPass = userPass; this.serverAddr = serverAddr; this.outFilePath = outFilePath; } /** * 提供执行的命令串 * @return commStr 命令串 */ private List doBuildCommand() { List rtnList = new ArrayList(); rtnList.add("EXP"); rtnList.add("@USER@/@PASSWORD@@@SERVER@".replaceAll("@USER@", this.userName) .replaceAll("@PASSWORD@", this.userPass).replaceAll("@SERVER@", this.serverAddr)); rtnList.add("FILE=/"@FILE@/"".replaceAll("@FILE@", this.outFilePath)); rtnList.add("TABLES=(SY_TABLE_DEF)"); return rtnList; } /** * 构建ProcessBuilder实例 * @param workDir 当前进程工作目录 * @return pbInst ProcessBuilder实例 * @see ProcessBuilder */ private ProcessBuilder buildProcessBuilder(File workDir) { new ProcessBuilder(); List commandArray = (doBuildCommand()); ProcessBuilder pbInst = new ProcessBuilder(commandArray); pbInst.command(commandArray); Map envMap = pbInst.environment(); envMap.clear(); envMap.putAll(System.getenv()); pbInst.directory(workDir); pbInst.redirectErrorStream(true); return pbInst; } /** * 线程执行入口 */ public void run() { File tmpOutFile = new File(this.outFilePath); File outDir = tmpOutFile.getParentFile(); ProcessBuilder pbInst = buildProcessBuilder(outDir); try { Process proInst = pbInst.start(); final InputStream ins = proInst.getInputStream(); File outFile = new File(outDir, "exp.log"); outFile.createNewFile(); final FileChannel focInst = new FileOutputStream(outFile).getChannel(); Thread innerTh = new Thread() { ByteBuffer byteBuffer = ByteBuffer.allocate(1024); public void run() { ReadableByteChannel rbcObj = Channels.newChannel(ins); try { while (rbcObj.read(byteBuffer) != -1) { byteBuffer.flip(); focInst.write(byteBuffer); byteBuffer.clear(); } } catch (IOException ioe) { ioe.printStackTrace(); } } }; // innerTh.setDaemon(true); innerTh.start(); } catch (IOException ioe) { ioe.printStackTrace(); } } } /** * 测试入口 * @param args 参数列表 */ public static void main(String[] args) { new BackupOracleDatabase().doWork(); } }

回首页