java多线程复制文件的实例代码

公共类 FileCoper {
私有静态最终字符串_ORIGIN_FILE_MODE =“r”；

私有静态最终字符串_TARGET_FILE_MODE =“rw”;

私有静态长时间1 = 0l;
私有字符串originFileName；

私有字符串目标文件名；

私有RandomAccessFile originFile；

私有RandomAccessFile目标文件；

私有 int threadCount；

私有静态 int 总线程数 = 0;

私有静态 int 执行计数 = 0;

公共 FileCoper() {
this.threadCount = 1;
总线程数 = this.threadCount;
}

公共 FileCoper(字符串 originFile, 字符串 targetFile) {
尝试 {
this.originFileName = originFile;
this.targetFileName = targetFile;
this.originFile = new RandomAccessFile((originFile), FileCoper._ORIGIN_FILE_MODE);
this.targetFile = new RandomAccessFile((targetFile), FileCoper._TARGET_FILE_MODE);
this.threadCount = 1;
总线程数 = this.threadCount;
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}

公共 FileCoper（字符串 originFile，字符串 targetFile，int threadCount）{
尝试 {
this.originFileName = originFile;
this.targetFileName = targetFile;
this.originFile = new RandomAccessFile((originFile), FileCoper._ORIGIN_FILE_MODE);
this.targetFile = new RandomAccessFile((targetFile), FileCoper._TARGET_FILE_MODE);
this.threadCount = 1;
总线程数 = this.threadCount;
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}

公共无效初始化（字符串originFile，字符串targetFile）抛出异常{
this.originFileName = originFile;
this.targetFileName = targetFile;
this.originFile = new RandomAccessFile((originFile), FileCoper._ORIGIN_FILE_MODE);
this.targetFile = new RandomAccessFile((targetFile), FileCoper._TARGET_FILE_MODE);
this.threadCount = 1;
总线程数 = this.threadCount;
}

公共无效初始化（字符串originFile，字符串targetFile，int threadCount）抛出异常{
this.originFileName = originFile;
this.targetFileName = targetFile;
this.originFile = new RandomAccessFile((originFile), FileCoper._ORIGIN_FILE_MODE);
this.targetFile = new RandomAccessFile((targetFile), FileCoper._TARGET_FILE_MODE);
this.threadCount = threadCount;
总线程数 = this.threadCount;
}

公共无效初始化（RandomAccessFile originFile，RandomAccessFile targetFile）抛出异常{
this.originFile = originFile;
this.targetFile = targetFile;
this.threadCount = 1;
总线程数 = this.threadCount;
}

公共无效初始化（RandomAccessFile originFile，RandomAccessFile targetFile，int threadCount）抛出异常{
this.originFile = originFile;
this.targetFile = targetFile;
this.threadCount = threadCount;
总线程数 = this.threadCount;
}

公共静态同步无效完成（）{
FileCoper.executedCount ++；

System.out.println("总线程【" + FileCoper.totalThreadCount + "】,已经完成【" + FileCoper.execulatedCount + "】个线程的复制！！！");
if (FileCoper.totalThreadCount == FileCoper.execulatedCount){
长时间2 = System.currentTimeMillis();
System.out.println("花费时间长："+(time2-time1));
System.out.println("所有【" + FileCoper.totalThreadCount + "】线程复制完成！！！");
}
}

公共无效开始（）抛出异常{
if (this.originFile.length() == 0)
返回;
if (this.threadCount == 0)
this.threadCount = 1;
// 设置目标文件大小
this.targetFile.setLength(this.originFile.length());
this.targetFile.seek(0);
this.originFile.seek(0);
time1 = System.currentTimeMillis();
System.out.println(this.originFile.length());
//放入文件分块，每一块有一对值：当前块在文件中的起始位置和结束位置
long[][] splits = new long[this.threadCount][2];
长 originFileLength = this.originFile.length();
int 起始位置 = 0;
for (int i = 0; i < this.threadCount; i++) {
分割[i][0] = 0;
分割[i][1] = 0；
如果（我==0）{
分割[i][0] = 0;
splits[i][1] = originFileLength / this.threadCount;

} else if (i == this.threadCount - 1) {
//注意：此处不能加1，如果加1，线程多文件就会出现乱码
// splits[i][0] = startPos + 1;
splits[i][0] = startPos;
splits[i][1] = originFileLength;
} 别的 {
//注意：此处不能加1，如果加1，线程多文件就会出现乱码
// splits[i][0] = startPos + 1;
splits[i][0] = startPos;
splits[i][1] = startPos + originFileLength / this.threadCount;
}
startPos += originFileLength / this.threadCount;
// System.out.println(splits[i][0] + " " + splits[i][1]);

Coper fc = new Coper("线程-" + i);
fc.init(this.originFile, this.targetFile, splits[i][0], splits[i][1]);
fc.setOriginFileName(this.originFileName);
fc.setTargetFileName(this.targetFileName);
fc.start();
}
}

公共无效startNew（）抛出异常{
if (this.originFile.length() == 0)
返回;
// 设置目标文件大小
this.targetFile.setLength(this.originFile.length());
this.targetFile.seek(0);
this.originFile.seek(0);

长起始位置；
长端位置；
长块 = this.originFile.length() / 1029;

if（块 <= 1）
this.threadCount = 1;

for (int i = 0; i < this.threadCount; i++) {
// 定义每次改变的长度
startPosition = i * 1029 * (块/this.threadCount);
endPosition = (i + 1) * 1029 * (块/this.threadCount);
if (i == (this.threadCount - 1))
endPosition = this.originFile.length();
Coper fc = new Coper("线程-" + i);
fc.init(this.originFile, this.targetFile, startPosition, endPosition);
fc.setOriginFileName(this.originFileName);
fc.setTargetFileName(this.targetFileName);
fc.start();

}
}

私有类 Coper 扩展 Thread {

私有字符串originFileName；

私有字符串目标文件名；

私有RandomAccessFile originFile；

私有RandomAccessFile目标文件；

私有字符串线程ID；

私人长起始位置；

私人多头头寸；

私有长块容量；

公共无效setOriginFileName（字符串originFileName）{
this.originFileName = originFileName;
}

公共无效setTargetFileName（字符串目标文件名）{
this.targetFileName = targetFileName;
}

公共铜（字符串线程ID）{
this.threadId = 线程Id;
}

公共无效初始化（RandomAccessFile originFile，RandomAccessFile targetFile，长startPosition，长endPosition）抛出异常{
this.originFile = originFile;
this.targetFile = targetFile;
this.startPosition = startPosition;
this.endPosition = endPosition;
this.blockCapacity = this.endPosition - this.startPosition;
}

公共无效运行（）{
// System.out.println(this.threadId + " 启动，开始复制文件【" +
// this.originFileName + "】中的文件块【" + this.startPosition + "," +
// this.endPosition + "】到目标文件【" + this.targetFileName + "】中...");
同步（this.originFile）{
尝试 {
// 记录当前拷贝的字节数
int 复制计数 = 0;
// 数据拷贝的暗示偏移量
长offSet = this.startPosition;
字节[] b = 新字节[16 * 1024 * 1024];
// 动态设置一次读取的字节数缓冲
长块大小=0；
while (copyCount < this.blockCapacity) {
this.originFile.seek(offSet);
if (this.blockCapacity - copyCount > 16 * 1024 * 1024)
块大小 = 16 * 1024 * 1024;
别的
blockSize = this.blockCapacity - copyCount;
if (blockSize > this.blockCapacity - copyCount)
blockSize = this.blockCapacity - copyCount;
int count = this.originFile.read(b, 0, (int) blockSize);
同步（this.targetFile）{
尝试 {
if (副本数 == 0)
this.targetFile.seek(offSet);
别的
this.targetFile.seek(offSet + 1);

this.targetFile.write(b, 0, 计数);
} catch (IOException e) {
e.printStackTrace();
}
}
// 增加拷贝的字节数
复制计数 += 计数；
// 复制其实【偏移量下移
偏移量 += 计数；
}
} catch (IOException e) {
e.printStackTrace();
}
}
// System.out.println(this.threadId + " 复制文件【" + this.originFileName
// + "】中的文件块【" + this.startPosition + "," + this.endPosition +
// "】到达目标文件【" + this.targetFileName + "】完成!");

// 完成通知主线程，当前线程复制工作
FileCoper.finish();
}

}

公共静态无效主（字符串[] args）抛出异常{
FileCoper fc = new FileCoper();
fc.init("e:/InitialData_zhihuan.sql", "e:/InitialData_zhihuan2.sql", 30);
//fc.init("d:/ValueAdd_11.txt", "d:/ValueAdd_111.txt", 100);
// fc.init("D:/tools/music/做你的爱人.mp3", "d:/做你的爱人_5.mp3", 10);
//fc.init("E:/电影/最黑暗下部.rmvb", "d:/最黑暗下部_1.rmvb", 100);

/* // 读入键盘输入
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
// 文件来源
字符串原始文件；
// 文件目标
字符串目标文件；
System.out.println("【源文件、目标文件、线程数】");
System.out.print("要复制的源文件：");
originFile = br.readLine();
System.out.print("文件复制到目标文件：");
targetFile = br.readLine();
System.out.print("切分线程数：");
int threadCount = Integer.parseInt(br.readLine());
fc.init(originFile, targetFile, threadCount);*/
// fc.startNew();
长时间1 = System.currentTimeMillis();
fc.start();
长时间2 = System.currentTimeMillis();
System.out.println(time2-time1);
}
}