JAVA开发_图片文件与字符串之间的转换

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

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

public class ImageUtil {

/**
 * 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
 * 
 * @param imgFile
 * @return
 */
public static String getImageStr(String imgFile) {
    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
}

/**
 * 对字节数组字符串进行Base64解码并生成图片
 * 
 * @param imgStr
 * @param imgFilePath
 * @return
 */
public static boolean generateImage(String imgStr, String imgFilePath) {
    if (imgStr == null) // 图像数据为空
        return false;
    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;
            }
        }
        // 生成图片
        OutputStream out = new FileOutputStream(imgFilePath);
        out.write(b);
        out.flush();
        out.close();
        return true;
    } catch (Exception e) {
        e.printStackTrace();
        return false;
    }
}

public static void main(String[] args) {
    String imageStr = getImageStr("e:\\test.jpg");
    System.out.println("Base64编码处理后的图片字符串:"+imageStr);
    System.out.println(imageStr.length());
    generateImage(imageStr, "e:\\test2.jpg");
}

}

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