使用Java和Base64解码进行解谜并生成图片

使用Java和Base64解码进行解谜并生成图片

工具类ImgUtil：

-import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Properties;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;

import com.mb.service.impl.GSAPIServiceImpl;

import sun.misc.BASE64Decoder;


@SuppressWarnings("restriction")
public class ImgUtil {
    public static String pa;
    public static Object FromBase64ToImage(String strImage, String fileName, int maxSize,HttpServletRequest req) throws IOException{
        //String webpath=req.getContextPath();
        Properties p = new Properties();
        p.load(ImgUtil.class.getClassLoader().getResourceAsStream("configurationfile.properties"));
        String webpath = req.getSession().getServletContext().getRealPath("/");
        String YM=new SimpleDateFormat("yyyyMM").format(new Date());
        String path= "\\files\\SQ\\" + YM + "\\";
        String urlPath = p.getProperty("imgUrl")+"/files/SQ/" + YM + "/";
        String imagePath = webpath + path;
        pa=urlPath+fileName;
        File file=new File(imagePath);
        if(!file .exists()  && !file .isDirectory()){
            file .mkdirs();  
        } 
        if(strImage.indexOf(',')>0){
            String[] strBase64 = strImage.split(",");
             if(strBase64 != null && strImage.length() >= 2){
                 strImage = strBase64[1];
             }
        }
        BASE64Decoder decoder = new BASE64Decoder();
        // Base64解码
        byte[] bytes = decoder.decodeBuffer(strImage);
        for (int i = 0; i < bytes.length; ++i) {
            if (bytes[i] < 0) {// 调整异常数据
                bytes[i] += 256;
            }
         }
        // 生成jpeg图片
        OutputStream out = new FileOutputStream(imagePath+fileName);
        out.write(bytes);
        out.flush();
        out.close();
        return imagePath;
    }
}

---

测试：
Object fromBase64ToImage = ImgUtil.FromBase64ToImage(imgdata, java.util.UUID.randomUUID() + “.jpg”, 300,req);
//ChangeHeadImage方法修改头像
int changeHeadImage = userService.ChangeHeadImage(userid, ImgUtil.pa);