java保存对象包含图片 java项目中图片怎么保存的

Java后端通过图片URL获取图片并保存

工作中需要同步图片并保存下来，但第三方接口返回结果只能返回图片的绝对路径，于是需要通过url获取图片信息，先通过获取url获取图片的二进制流并转化为base64.

public static String image2Base64(String imgUrl) {
        URL url = null;
        InputStream is = null;
        ByteArrayOutputStream outStream = null;
        HttpURLConnection httpUrl = null;
        try{
            url = new URL(imgUrl);
            httpUrl = (HttpURLConnection) url.openConnection();
            httpUrl.connect();
            httpUrl.getInputStream();
            is = httpUrl.getInputStream();
            outStream = new ByteArrayOutputStream();
            //创建一个Buffer字符串
            byte[] buffer = new byte[1024];
            //每次读取的字符串长度，如果为-1，代表全部读取完毕
            int len = 0;
            //使用一个输入流从buffer里把数据读取出来
            while( (len=is.read(buffer)) != -1 ){
                //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
                outStream.write(buffer, 0, len);
            }
            // 对字节数组Base64编码
            return Base64Utils.encodeImage(outStream.toByteArray());
        }catch (Exception e) {
            e.printStackTrace();
        }
        finally{
            if(is != null)
            {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(outStream != null)
            {
                try {
                    outStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(httpUrl != null)
            {
                httpUrl.disconnect();
            }
        }
        return imgUrl;
    }
    /**
	 * 图片转字符串
	 * @param image
	 * @return
	 */
	public static String encodeImage(byte[] image){
		BASE64Encoder decoder = new BASE64Encoder();
		return replaceEnter(decoder.encode(image));
	}

	public static String replaceEnter(String str){
		String reg ="[\n-\r]";
		Pattern p = Pattern.compile(reg);
		Matcher m = p.matcher(str);
		return m.replaceAll("");
	}

在通过base64转换为image并保存到指定的路径，下面为Base64Util的代码

public static void base64ToImage(String path,String base64) {
		File file = null;
		BufferedOutputStream bos = null;
		java.io.FileOutputStream fos = null;
		try {
			byte[] bytes = Base64.getDecoder().decode(base64);
			file = new File(path);
			fos = new java.io.FileOutputStream(file);
			bos = new BufferedOutputStream(fos);
			bos.write(bytes);
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			if (bos != null) {
				try {
					bos.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if (fos != null) {
				try {
					fos.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}

上面以百度图片为例：