public static void main(String[] args) throws Exception {
File file = new File("C:\\Users\\Administrator\\Pictures\\girl.jpg");
File destFile = new File("d:\\girl.jpg");
System.out.println(file.length());
int data1 = (int) (file.length()/2);
int data2 = (int) (file.length() -data1);
//存储图片的字节数组输出流
ByteArrayOutputStream bos = new ByteArrayOutputStream();
Thread t1 = new Thread() {
public void run() {
FileImageInputStream input = null;
try {
input = new FileImageInputStream(file);
byte[] buf = new byte[data1];
input.read(buf);//读到缓冲
bos.write(buf);//把缓冲写到字节数组输出流
} catch (Exception e) {
e.printStackTrace();
}finally {
try {
bos.close();
input.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
};
t1.start();
Thread.sleep(200);//保证先读取第一部分数据,否则可能第二个线程先启动,图片打不开
Thread t2 = new Thread() {
public void run() {
FileImageInputStream input = null;
try {
input = new FileImageInputStream(file);
byte[] buf = new byte[data2];
input.skipBytes(data1);//跳过读取的
input.read(buf);//读到缓冲
bos.write(buf);//把缓冲写到字节数组输出流
} catch (Exception e) {
e.printStackTrace();
}finally {
try {
bos.close();
input.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
};
t2.start();
t1.join();
t2.join();
//图片数据都在ByteArrayOutputStream
FileImageOutputStream output = new FileImageOutputStream(destFile);
System.out.println("==="+bos.toByteArray().length);
output.write(bos.toByteArray());
output.close();
}
多线程文件复制工具--复制图片
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转载自blog.csdn.net/kongfanyu/article/details/103786966
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