Java base64 图片编码转换详解编程语言

package com.test; 
 
import org.junit.Test; 
import sun.misc.BASE64Decoder; 
import sun.misc.BASE64Encoder; 
 
import java.io.*; 
 
/** 
 *BASE64 
 */ 
public class Base64Test { 
 
    @Test 
    public void baseTest(){ 
        //加密 
        String basestr = imageChangeBase64("D://1.png"); 
        System.out.println(basestr); 
        //解密 
        base64ChangeImage(basestr,"D://2.png"); 
    } 
 
    /** 
     * 图片转BASE64 
     * @param imagePath 路径 
     * @return 
     */ 
    public String imageChangeBase64(String imagePath){ 
        InputStream inputStream = null; 
        byte[] data = null; 
        try { 
            inputStream = new FileInputStream(imagePath); 
            data = new byte[inputStream.available()]; 
            inputStream.read(data); 
            inputStream.close(); 
        } catch (IOException e) { 
            e.printStackTrace(); 
        } 
        // 加密 
        BASE64Encoder encoder = new BASE64Encoder(); 
        return encoder.encode(data); 
    } 
 
    /** 
     * BASE转图片 
     * @param baseStr  base64字符串 
     * @param imagePath 生成的图片 
     * @return 
     */ 
    public boolean base64ChangeImage(String baseStr,String imagePath){ 
        if (baseStr == null){ 
            return false; 
        } 
        BASE64Decoder decoder = new BASE64Decoder(); 
        try { 
            // 解密 
            byte[] b = decoder.decodeBuffer(baseStr); 
            // 处理数据 
            for (int i = 0; i < b.length; ++i) { 
                if (b[i] < 0) { 
                    b[i] += 256; 
                } 
            } 
            OutputStream out = new FileOutputStream(imagePath); 
            out.write(b); 
             out.flush(); 
            out.close(); 
            return true; 
        } catch (Exception e) { 
            return false; 
        } 
    } 
}

在线的base64图片转换带有："data:image/jpeg;base64," 解码之前这个得去掉。