package com.java110.api.rest;
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import java.awt.Color;
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import java.awt.Graphics;
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import java.awt.Image;
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import java.awt.image.BufferedImage;
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import java.io.BufferedInputStream;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Arrays;
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import javax.imageio.ImageIO;
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import javax.imageio.stream.FileImageOutputStream;
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public class PicTest {
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public static void main(String[] args) throws IOException {
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long timeStart = System.currentTimeMillis();
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String imgLocalUrl = "D:\\白静雪.jpg";
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byte[] imgBytes = getByteByPic(imgLocalUrl);
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byte[] resultImg = compressUnderSize(imgBytes,800 * 1024);
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byte2image(resultImg,"E:\\tp\\timga.jpg");
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long timeEnd = System.currentTimeMillis();
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System.out.println("耗时："+ (timeEnd - timeStart));
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}
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public static byte[] getByteByPic(String imageUrl) throws IOException{
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File imageFile = new File(imageUrl);
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InputStream inStream = new FileInputStream(imageFile);
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BufferedInputStream bis = new BufferedInputStream(inStream);
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BufferedImage bm = ImageIO.read(bis);
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ByteArrayOutputStream bos = new ByteArrayOutputStream();
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String type = imageUrl.substring(imageUrl.length() - 3);
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ImageIO.write(bm, type, bos);
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bos.flush();
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byte[] data = bos.toByteArray();
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return data;
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}
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/**
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* 将图片压缩到指定大小以内
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*
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* @param srcImgData 源图片数据
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* @param maxSize 目的图片大小
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* @return 压缩后的图片数据
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*/
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public static byte[] compressUnderSize(byte[] srcImgData, long maxSize) {
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double scale = 0.9;
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byte[] imgData = Arrays.copyOf(srcImgData, srcImgData.length);
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if (imgData.length > maxSize) {
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do {
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try {
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imgData = compress(imgData, scale);
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} catch (IOException e) {
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throw new IllegalStateException("压缩图片过程中出错，请及时联系管理员！", e);
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}
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} while (imgData.length > maxSize);
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}
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return imgData;
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}
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/**
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* 按照 宽高 比例压缩
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*
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* @param scale 压缩刻度
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* @return 压缩后图片数据
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* @throws IOException 压缩图片过程中出错
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*/
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public static byte[] compress(byte[] srcImgData, double scale) throws IOException {
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BufferedImage bi = ImageIO.read(new ByteArrayInputStream(srcImgData));
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int width = (int) (bi.getWidth() * scale); // 源图宽度
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int height = (int) (bi.getHeight() * scale); // 源图高度
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Image image = bi.getScaledInstance(width, height, Image.SCALE_SMOOTH);
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BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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Graphics g = tag.getGraphics();
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g.setColor(Color.RED);
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g.drawImage(image, 0, 0, null); // 绘制处理后的图
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g.dispose();
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ByteArrayOutputStream bOut = new ByteArrayOutputStream();
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ImageIO.write(tag, "JPEG", bOut);
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return bOut.toByteArray();
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}
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//byte数组到图片
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public static void byte2image(byte[] data,String path){
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if(data.length<3||path.equals("")) return;
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try{
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FileImageOutputStream imageOutput = new FileImageOutputStream(new File(path));
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imageOutput.write(data, 0, data.length);
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imageOutput.close();
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System.out.println("Make Picture success,Please find image in " + path);
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} catch(Exception ex) {
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System.out.println("Exception: " + ex);
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ex.printStackTrace();
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}
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}
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}
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