java生成base64编码的png
java代码:
引用包:
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Hashtable;
import javax.imageio.ImageIO;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import sun.misc.BASE64Encoder;
方法:
/**
* 二维码生成器
*
* @param text 二维码内容
* @throws IOException
*/
@SuppressWarnings({ "unchecked", "rawtypes", "restriction" })
public static String generalQRCode(String url) {
Hashtable hints= new Hashtable();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
String binary = null;
try {
BitMatrix bitMatrix = new MultiFormatWriter().encode(
url, BarcodeFormat.QR_CODE, 200, 200, hints);
// 实现一: 输出图片到指定目录
// File outputFile = new File("d://1.jpg");
// MatrixToImageWriter.writeToFile(bitMatrix, "png", outputFile);
// 实现二:生成二维码图片并将图片转为二进制传递给前台
// 1、读取文件转换为字节数组
ByteArrayOutputStream out = new ByteArrayOutputStream();
BufferedImage image = toBufferedImage(bitMatrix);
////
ImageIO.write(image, "png", out);
byte[] bytes = out.toByteArray();
// 2、将字节数组转为二进制
BASE64Encoder encoder = new BASE64Encoder();
binary = encoder.encodeBuffer(bytes).trim();
} catch (Exception e) {
e.printStackTrace();
}
return binary;
}
// 其他调用方法
public static BufferedImage toBufferedImage(BitMatrix matrix) {
int width = matrix.getWidth();
int height = matrix.getHeight();
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
for (int x = 0; x < width; x++) {
for (int y = 0; y < height; y++) {
image.setRGB(x, y, matrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
}
}
return image;
}
前台ajax方法:
$.ajax({
url: 方法url,
type:'post',
success : function(data) {
$('#img').attr('src', 'data:image/jpg;base64,' + data);
}
});
注意:img 的src前面需要拼接data:image/jpg;base64, 在加上后台生成的二进制才能正确解析二进制
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posted on 2016-07-01 14:21 jie_er的种码园子 阅读(1730) 评论(0) 编辑 收藏 举报