JAVA base64图片字符串和file之间互相转换

 

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import java.io.*;

public class Base64Img {

	//图片转化成base64字符串

	public static String GetImageStr(File imgFile) {//将图片文件转化为字节数组字符串，并对其进行Base64编码处理

		InputStream in = null;

		byte[] data = null;

		//读取图片字节数组

		try {

			in = new FileInputStream(imgFile);

			data = new byte[in.available()];

			in.read(data);

			in.close();

		} catch (IOException e) {

			e.printStackTrace();

		}

		//对字节数组Base64编码

		BASE64Encoder encoder = new BASE64Encoder();

		return encoder.encode(data);//返回Base64编码过的字节数组字符串

	}


	//base64字符串转化成图片
	public static File base64ToFile(String base64, String fileName) throws Exception {
		if(base64.contains("data:image")){
			base64 = base64.substring(base64.indexOf(",")+1);
		}
		base64 = base64.toString().replace("\r\n", "");
		File file = null;
		//创建文件目录
		String filePath=Const.TEMP_PATH;
		File  dir=new File(filePath);
		if (!dir.exists() && !dir.isDirectory()) {
			dir.mkdirs();
		}
		BufferedOutputStream bos = null;
		java.io.FileOutputStream fos = null;
		try {
			BASE64Decoder decoder = new BASE64Decoder();
			byte[] bytes =  decoder.decodeBuffer(base64);

			file=new File(filePath+Const.F+fileName);
			OutputStream out = new FileOutputStream(filePath+Const.F+fileName);
			fos = new FileOutputStream(file);
			bos = new BufferedOutputStream(fos);
			bos.write(bytes);
		}finally {
			if (bos != null) {
				try {
					bos.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if (fos != null) {
				try {
					fos.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return file;
	}

}