Base64处理类

系统管理员 2022-05-30 05:22 127阅读 0赞

import java.io.ByteArrayOutputStream;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.OutputStream;
    import java.util.Hashtable;
    
    import org.apache.commons.codec.binary.Base64;
    
    import Decoder.BASE64Decoder;
    
    import com.alibaba.fastjson.JSONObject;
    import com.google.zxing.BarcodeFormat;
    import com.google.zxing.EncodeHintType;
    import com.google.zxing.MultiFormatWriter;
    import com.google.zxing.client.j2se.MatrixToImageWriter;
    import com.google.zxing.common.BitMatrix;
    import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;
    
    /**
     * Base64处理类
     */
    public class Base64Util {
    
    	/**
    	 * 将base64格式的图片转换成本地图片文件
    	 * 
    	 * @method base64ToFileByte
    	 * @param fileJson
    	 *            base64字符串
    	 * @param fileName
    	 *            本地临时文件名(如1.png)
    	 * @return File 本地临时文件
    	 * @throws Exception
    	 */
    	public static File base64ToFile(String fileJson, String fileName)
    			throws Exception {
    		String prvPath = Thread.currentThread().getContextClassLoader()
    				.getResource("/").getPath();
    		String path = prvPath.substring(1, prvPath.indexOf("classes"))
    				+ "temp/";
    		String tempPath = path + fileName;
    		File file = new File(path);
    		if (!file.exists()) {
    			file.mkdirs();
    		}
    		file = new File(tempPath);
    		if (file.exists()) {
    			file.delete();
    		}
    		Base64 base64 = new Base64();
    		byte[] b = base64.decode(fileJson);
    		OutputStream out = new FileOutputStream(file);
    		out.write(b);
    		out.flush();
    		out.close();
    		return file;
    	}
    
    	/**
    	 * 将指定信息写入base64字符串
    	 * 
    	 * @method toBase64
    	 * @param contents
    	 * @param width
    	 * @param height
    	 * @return
    	 * @throws Exception
    	 */
    	public static String toBase64(JSONObject obj, int width, int height)
    			throws Exception {
    		Hashtable<Object, Object> hints = new Hashtable<Object, Object>();
    		// 指定纠错等级
    		hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
    		// 指定编码格式
    		BitMatrix byteMatrix = new MultiFormatWriter().encode(new String(obj
    				.toJSONString().getBytes("UTF-8"), "iso-8859-1"),
    				BarcodeFormat.QR_CODE, width, height);
    		ByteArrayOutputStream bao = new ByteArrayOutputStream();
    		MatrixToImageWriter.writeToStream(byteMatrix, "png", bao);
    		String ok = Base64Code(bao.toByteArray());
    		bao.flush();
    		bao.close();
    		return ok;
    	}
    
    	/**
    	 * base64加密
    	 * @method Base64Code
    	 * @param b
    	 * @return
    	 */
    	public static String Base64Code(byte[] b) {
    		Base64 encoder = new Base64();
    		StringBuilder pictureBuffer = new StringBuilder();
    		pictureBuffer.append(encoder.encodeAsString(b));
    		String codeBase64 = pictureBuffer.toString();
    		return codeBase64;
    	}
    
    	// base64字符串转化成图片
    	public static boolean GenerateImage(String imgStr) { // 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;
    		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jpeg图片
    			String imgFilePath = "C:\\new.jpg";// 新生成的图片
    			OutputStream out = new FileOutputStream(imgFilePath);
    			out.write(b);
    			out.flush();
    			out.close();
    			return true;
    		} catch (Exception e) {
    			return false;
    		}
    	}
    
    	public static void main(String[] args) {
    		try {
    			JSONObject container1 = new JSONObject();
    			container1.put("QQ", "2418741378");
    			container1.put("昵称", "路人甲");
    			String aa = Base64Util.toBase64(container1, 150, 150);
    			GenerateImage(aa);
    		} catch (Exception e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    	}
    }