Java IO流 复制文件 复制过来的文件时空白 ——为什么会这样？

[size=x-small]public void copyFile(String path1,String path2){
    try {
        DataInputStream in = new DataInputStream(new BufferedInputStream(new FileInputStream(path1)));
        DataOutputStream out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(path2)));

        byte[] buf = new byte[1024];
        int b;
        while((b=in.read())!=-1){
            out.write(buf,0,b);
        }           
        in.close();
        out.close();
        System.out.println("文件复制成功");
    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}[size=x-small][/size][size=small][/size][/size]

while((b=in.read())!=-1){
改成：
while((b=in.read(buf))!=-1){

也可以参考一下下面的文章：

[url]http://blogzhoubo.iteye.com/admin/blogs/805044[/url]

在out.close(); 前写上out.flush()