package org.springblade.common.utils;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import javax.imageio.ImageIO;
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import javax.swing.ImageIcon;
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import java.awt.Graphics;
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import java.awt.GraphicsConfiguration;
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import java.awt.GraphicsDevice;
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import java.awt.GraphicsEnvironment;
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import java.awt.HeadlessException;
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import java.awt.Image;
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import java.awt.Toolkit;
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import java.awt.Transparency;
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import java.net.HttpURLConnection;
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import java.net.URL;
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public class ImageUtils {
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public static String getBase64ByImgUrl(String url){
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String suffix = url.substring(url.lastIndexOf(".") + 1);
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try {
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URL urls = new URL(url);
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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Image image = Toolkit.getDefaultToolkit().getImage(urls);
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BufferedImage biOut = toBufferedImage(image);
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ImageIO.write(biOut, suffix, baos);
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String base64Str = Base64Util.encode(baos.toByteArray());
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return base64Str;
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} catch (Exception e) {
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return "";
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}
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}
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public static BufferedImage toBufferedImage(Image image) {
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if (image instanceof BufferedImage) {
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return (BufferedImage) image;
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}
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// This code ensures that all the pixels in the image are loaded
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image = new ImageIcon(image).getImage();
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BufferedImage bimage = null;
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GraphicsEnvironment ge = GraphicsEnvironment
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.getLocalGraphicsEnvironment();
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try {
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int transparency = Transparency.OPAQUE;
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GraphicsDevice gs = ge.getDefaultScreenDevice();
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GraphicsConfiguration gc = gs.getDefaultConfiguration();
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bimage = gc.createCompatibleImage(image.getWidth(null),
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image.getHeight(null), transparency);
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} catch (HeadlessException e) {
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// The system does not have a screen
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}
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if (bimage == null) {
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// Create a buffered image using the default color model
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int type = BufferedImage.TYPE_INT_RGB;
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bimage = new BufferedImage(image.getWidth(null),
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image.getHeight(null), type);
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}
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// Copy image to buffered image
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Graphics g = bimage.createGraphics();
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// Paint the image onto the buffered image
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g.drawImage(image, 0, 0, null);
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g.dispose();
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return bimage;
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}
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/**
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* 通过图片的url获取图片的base64字符串
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* @param imgUrl 图片url
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* @return 返回图片base64的字符串
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*/
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public static String imageUrlToBase64(String imgUrl) {
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URL url = null;
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InputStream is = null;
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ByteArrayOutputStream outStream = null;
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HttpURLConnection httpUrl = null;
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try{
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url = new URL(imgUrl);
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httpUrl = (HttpURLConnection) url.openConnection();
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httpUrl.connect();
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httpUrl.getInputStream();
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is = httpUrl.getInputStream();
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outStream = new ByteArrayOutputStream();
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//创建一个Buffer字符串
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byte[] buffer = new byte[1024];
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//每次读取的字符串长度，如果为-1，代表全部读取完毕
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int len = 0;
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//使用一个输入流从buffer里把数据读取出来
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while( (len=is.read(buffer)) != -1 ){
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//用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
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outStream.write(buffer, 0, len);
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}
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// 对字节数组Base64编码
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return Base64Util.encode(outStream.toByteArray());
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}catch (Exception e) {
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e.printStackTrace();
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}
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finally{
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if(is != null)
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{
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try {
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is.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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if(outStream != null)
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{
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try {
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outStream.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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if(httpUrl != null)
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{
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httpUrl.disconnect();
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}
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}
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return imgUrl;
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}
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}
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