java实现文件的复制，删除，解压

废话不多说，代码如下:

(一)复制文件代码

    public static void copyFile(File sourceFile, File targetFile) throws IOException{
        BufferedInputStream inBuff = null;
        BufferedOutputStream outBuff = null;
        try {
            // 新建文件输入流并对它进行缓冲
            inBuff = new BufferedInputStream(new FileInputStream(sourceFile));
            // 新建文件输出流并对它进行缓冲
            outBuff = new BufferedOutputStream(new FileOutputStream(targetFile));
            // 缓冲数组
            byte[] b = new byte[1024 * 5];
            int len;
            while ((len = inBuff.read(b)) != -1) {
                outBuff.write(b, 0, len);
            }
            // 刷新此缓冲的输出流
            outBuff.flush();
        } finally {
            // 关闭流
            if (inBuff != null)
                inBuff.close();
            if (outBuff != null)
                outBuff.close();
        }
    }

（二）解压zip格式文件的代码

    public static void unzipFile(String source, String target)
            throws IOException {
        ZipFile zipFile = new ZipFile(new File(source), "GBK");
        System.err.println("文件解压开始");
        Enumeration<?> e = zipFile.getEntries();
        ZipEntry zipEntry;
        while (e.hasMoreElements()) {
            zipEntry = (ZipEntry) e.nextElement();
            InputStream fis = zipFile.getInputStream(zipEntry);
            if (!zipEntry.isDirectory()) {
                File file = new File(target + File.separator
                        + zipEntry.getName());
                File parentFile = file.getParentFile();
                parentFile.mkdirs();
                FileOutputStream fos = new FileOutputStream(file);
                byte[] b = new byte[1024];
                int len;
                while ((len = fis.read(b, 0, b.length)) != -1) {
                    fos.write(b, 0, len);
                }
                fos.close();
                fis.close();
            }
        }
        zipFile.close();
        System.err.println("文件解结束");
    }

（三）删除文件的代码

public static void delFile(File targetFile){
        if (targetFile.exists() && targetFile.isDirectory()) {// 判断是文件还是目录
            if (targetFile.listFiles().length == 0) {// 若目录下没有文件则直接删除
                targetFile.delete();
            } else {// 若有则把文件放进数组，并判断是否有下级目录
                File del[] = targetFile.listFiles();
                int i = targetFile.listFiles().length;
                for (int j = 0; j < i; j++) {
                    if (del[j].isDirectory()) {
                        delFile(new File(del[j].getAbsolutePath()));// 递归调用del方法并取得子目录路径
                    }
                    del[j].delete();// 删除文件
                }
            }
        }
    }