如何用java复制图片

如何用java复制文件中的图片

    public static void main(String[] args)
    {
        String src="这里放你要复制的图片的地址，记得在后面加.jpg";//否则可能会报拒绝访问或者无权限
        String target="这里放你要复制到的文件的地址，同样，也要加.jpg";
        copyFile(src,target);
    }
    public static void copyFile(String src,String target)
    {
    //首先需要确定两个源
        File srcFile = new File(src);
        File targetFile = new File(target);
        try {
        //选择两个流
            InputStream in = new FileInputStream(srcFile);
            OutputStream out = new FileOutputStream(targetFile);
            //操作流
            byte[] bytes = new byte[1024];
            int len = -1;
            while((len=in.read(bytes))!=-1)
            {
                out.write(bytes, 0, len);
            }
            //关闭流
            in.close();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("文件复制成功");
    }

如何用java从网站链接中复制图片到文件中

    public static void main(String[] args) {

        // 声明stream输入输出类
        OutputStream os = null;
        InputStream is = null;

        try {
            // 生成URL类并建立连接
            URL url = new URL("链接地址");
            URLConnection conn = url.openConnection();
            is = conn.getInputStream();

            // 准备输出文件，开始读写
            File f = new File("io.jpg");
            os = new FileOutputStream(f);
            byte[] b = new byte[1024];
            int len = 0;
            while((len = is.read(b))!= -1) {
                os.write(b, 0 ,len);
            }
            os.close();
            is.close();
            //最后记得关闭
        } catch (IOException e) {
            e.printStackTrace();
        }
    }