# 1、添加依赖

	<!-- 图片缩略图 -->
	<dependency>
	<groupId>net.coobird</groupId>
	<artifactId>thumbnailator</artifactId>
	<version>0.4.8</version>
	</dependency>

# 2、base64 加密方法

	//base64 加密
	/**
	* 图片转 base64 加密
	* @param imgFile
	* @return
	*/
	protected static String imageToBase64Str(String imgFile) {
	String strRet = "";

	InputStream inputStream = null;
	byte[] data = null;
	try {
	inputStream = new FileInputStream(imgFile);
	data = new byte[inputStream.available()];
	inputStream.read(data);
	inputStream.close();
	} catch (IOException e) {
	e.printStackTrace();
	}
	// 加密
	org.apache.commons.codec.binary.Base64 encoder = new org.apache.commons.codec.binary.Base64();
	strRet = encoder.encodeAsString(data);

	return strRet;
	}

	/**
	* @param imgStr base64 编码字符串
	* @param path 图片路径 - 具体到文件
	* @return
	* @Description: 将 base64 编码字符串转换为图片
	* @Author:
	* @CreateTime:
	*/
	public static boolean generateImage(String imgStr, String path) {
	if(imgStr == null){
	return false;
	}
	BASE64Decoder decoder = new BASE64Decoder();
	try{
	// 解密
	byte[] b = decoder.decodeBuffer(imgStr);
	// 处理数据
	for (int i = 0;i<b.length;++i){
	if(b[i]<0){
	b[i]+=256;
	}
	}
	OutputStream out = new FileOutputStream(path);
	out.write(b);
	out.flush();
	out.close();
	return true;
	} catch (IOException e) {
	e.printStackTrace();
	return false;
	}
	}

	//TODO 缩小图片 200X200
	String basePath = Controller.class.getResource("/").getPath();
	basePath = basePath.substring(1, basePath.length());
	String reportPath = "";
	reportPath = basePath.replace("classes", "images"); // 找到 image 路径
	String srcPath = reportPath + "image.jpeg";
	generateImage(faceImage, srcPath);
	String destPath = reportPath + "newImage.jpeg";
	try {
	resizeImage(srcPath, destPath, 200, 200, false);
	String newImage = imageToBase64Str(destPath);// 改变大小后的图片 base64 码
	LOGGER.debug(newImage);
	} catch (IOException e) {
	e.printStackTrace();
	}

	/**
	* 重新生成图片宽、高
	* @param srcPath 图片路径
	* @param destPath 新生成的图片路径
	* @param newWigth 新的宽度
	* @param newHeight 新的高度
	* @param forceSize 是否强制使用指定宽、高，false: 会保持原图片宽高比例约束
	* @return
	* @throws IOException
	*/
	public static boolean resizeImage (String srcPath, String destPath, int newWigth, int newHeight, boolean forceSize) throws IOException {
	if (forceSize) {
	try {
	Thumbnails.of(srcPath).forceSize(newWigth, newHeight).toFile(destPath);
	} catch (IOException e) {
	e.printStackTrace();
	}
	} else {
	Thumbnails.of(srcPath).width(newWigth).height(newHeight).toFile(destPath);
	}
	return true;
	}

注意：

data:image/jpg;base64,