Base64

• Base64Util.java
  • GenerateImage方法
  • enode方法

import java.io.*;
import java.util.Base64;
import java.util.Base64.Decoder;
import java.util.Base64.Encoder;

public class Base64Util {

    /**
     * base64字符串转化成图片
     *
     * @param imgData     图片base64码
     * @param imgFilePath 存放到本地路径
     * @return
     * @throws IOException
     */
    public static boolean generateImage(String imgData, String imgFilePath) { // 对字节数组字符串进行Base64解码并生成图片
        if (imgData == null) // 图像数据为空
            return false;
        if (imgData.contains("base64")) {
            imgData = imgData.substring(imgData.indexOf(",") + 1);
        }
        Decoder decoder = Base64.getDecoder();
        OutputStream out = null;
        try {
            out = new FileOutputStream(imgFilePath);
            // Base64解码
            byte[] b = decoder.decode(imgData);
            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {// 调整异常数据
                    b[i] += 256;
                }
            }
            out.write(b);
            return true;
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        } finally {
            try {
                out.flush();
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }


    //将字节数组转为base64
    public static String encode(byte[] bytes) {
        Encoder encoder = Base64.getEncoder();
        String answer = "";
        // 读取图片字节数组
        answer = new String(encoder.encode(bytes));
        return answer;
    }

    //将文件转码为base64
    public static String encode(File file) {
        try {
            byte[] bytes = FileUtil.readFileByBytes(file);
            return encode(bytes);
        } catch (IOException e) {
            e.printStackTrace();
            return "";
        }
    }

    //根据文件路径获取文件，并转码为base64
    public static String encode(String filePath) {
        try {
            byte[] bytes = FileUtil.readFileByBytes(filePath);
            return encode(bytes);
        } catch (IOException e) {
            e.printStackTrace();
            return "";
        }
    }

}