java自带BASE64工具进行图片和字符串转换【转】

 java自带BASE64工具进行图片和字符串转换

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

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

public class Base64Test {
    public static void main(String[] args) throws Exception{
        File inputFile = new File("src/test.jpg");// 放在src文件夹下 待处理的图片
        String strImg = null;
        if(inputFile.exists()){
            strImg = getImageStr(inputFile);
            System.out.println(inputFile.getPath()+"转换后的字符串:
"+strImg);
        }
        
        File outputFile = new File("src/testCopy.jpg");// 即将在src文件夹下 生成的图片
        generateImage(outputFile,strImg);
    }

    /**
     * 图片转化成base64字符串
     * @param inputFile  源图片文件路径
     * @return
     */
    public static String getImageStr(File inputFile) throws Exception{// 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
        in = new FileInputStream(inputFile);
        data = new byte[in.available()];
        in.read(data);
        in.close();
        // 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
     * @param outputFile 输出目标图片
     * @param imgStr BASE64字符串
     * @return
     */
    public static boolean generateImage( File outputFile ,String imgStr ) throws Exception{ // 对字节数组字符串进行Base64解码并生成图片
        if (imgStr == null) // 图像数据为空
            return false;
//        imgStr =  "";
        BASE64Decoder decoder = new BASE64Decoder();
        try {
            // Base64解码
            byte[] b = decoder.decodeBuffer(imgStr);
            for (int i = 0; i < b.length; ++i) {
                if (b[i] < 0) {// 调整异常数据
                    b[i] += 256;
                }
            }
            // 生成jpg图片
            OutputStream out = new FileOutputStream(outputFile);
            out.write(b);
            out.flush();
            out.close();
            System.out.println("通过BASE64字符串
"+imgStr+"
 生成"+outputFile.getPath());
            return true;
        } catch (Exception e) {
            return false;
        }
    }
}

打印结果

src	est.jpg转换后的BASE64字符串:
iVBORw0KGgoAAAANSUhEUgAAAFoAAAAZAQMAAACLqquDAAAABlBMVEUAAAD///+l2Z/dAAAAY0lE
QVR4nGNgIAOwf0DisDHg5DxA1mPAwMDfAONJANEBJA5DAkwPiAOTYTawYWCG6WF8kAaUYYRZfRio
h1kCicMA46QDjWb+AeVYAy1lg8kwgyywgHKcQQI3oJw0ZHfbMJAIALYtEHx6n3m7AAAAAElFTkSu
QmCC
通过BASE64字符串
iVBORw0KGgoAAAANSUhEUgAAAFoAAAAZAQMAAACLqquDAAAABlBMVEUAAAD///+l2Z/dAAAAY0lE
QVR4nGNgIAOwf0DisDHg5DxA1mPAwMDfAONJANEBJA5DAkwPiAOTYTawYWCG6WF8kAaUYYRZfRio
h1kCicMA46QDjWb+AeVYAy1lg8kwgyywgHKcQQI3oJw0ZHfbMJAIALYtEHx6n3m7AAAAAElFTkSu
QmCC
 生成src	estCopy.jpg

引用自： http://blog.csdn.net/hfhwfw/article/details/5544408