【工具类】复制文件

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class FileUtil {
    private static final int BUFFER_SIZE = 2 * 1024;
    /*复制文件到本地磁盘*/
    public static void copy(File src, File dst) {
        InputStream in = null;
        OutputStream out = null;
        try {
            if (dst.exists()) {
                out = new BufferedOutputStream(new FileOutputStream(dst, true), BUFFER_SIZE);
            } else {
                out = new BufferedOutputStream(new FileOutputStream(dst), BUFFER_SIZE);
            }
            in = new BufferedInputStream(new FileInputStream(src), BUFFER_SIZE);

            byte[] buffer = new byte[BUFFER_SIZE];
            int len = 0;
            while ((len = in.read(buffer)) > 0) {
                out.write(buffer, 0, len);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (null != in) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != out) {
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}