JAVA多线程文件复制

import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.io.RandomAccessFile;public class FileCope implements Runnable{private String sourceFileName = null;//支援文件路径private String targetFileName = null;//目标文件路径private long blockCount;//总分块数private long blockNo;//当前分块数private int maxBufferSize = 1024;public FileCope(String sourceFileName, String targetFileName, long blockCount, long blockNo){this.sourceFileName = sourceFileName;this.targetFileName = targetFileName;this.blockCount = blockCount;this.blockNo = blockNo;}public void run() {File f = new File(sourceFileName);FileInputStream fileIn = null;RandomAccessFile fileRead = null;try {//计算每块的字节数long blockLength = f.length()/blockCount;//计算起始位置long startPosition = blockLength*blockNo;byte[] temp = new byte[maxBufferSize];fileIn = new FileInputStream(f);//设置读取模式为RM（如果当前文件不存在则创建文件）fileRead = new RandomAccessFile(targetFileName,"rw");fileIn.skip(startPosition);fileRead.seek(startPosition);//当前读取的字节数int curRedLength; //累计读取字节数的和 int totalRedLength=0; while((curRedLength = fileIn.read(temp)) >0 && totalRedLength < blockLength){ fileRead.write(temp, 0, curRedLength); totalRedLength += curRedLength; } } catch (FileNotFoundException e) {e.printStackTrace();}catch (IOException e) { e.printStackTrace(); }finally{try {if(fileRead != null){fileRead.close();}if(fileIn != null){fileIn.close();}}catch (IOException e) { e.printStackTrace(); }}}}

import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;import com.file.cope.FileCope;/** * 文件多线程拷贝测试 * @author Administrator * */public class FileTest {public static void main(String[] args){String sourceFileName = "E://源文件//java软件//jdk-1_5_0_19-windows-i586-p.exe";String targetFileName = "E://源文件//java软件//jdk-1_5_0_19-windows-i586-pCode.exe";//创建线程池ExecutorService ex = Executors.newFixedThreadPool(20);long blockCount = 1000;long beginTime=System.currentTimeMillis();for(int i =0 ; i<blockCount; i ++){ex.execute(new FileCope(sourceFileName, targetFileName, blockCount, i));}ex.shutdown();while(true){if(ex.isTerminated()){long endTime=System.currentTimeMillis();System.out.println(endTime- beginTime);break;}}}}

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