直接上源码，解释见文章尾部
1 package com.hs.common.util.imgecode;
2
3 import com.hs.common.util.Logger;
4 import net.coobird.thumbnailator.Thumbnails;
5 import org.apache.commons.codec.binary.Base64;
6 import sun.misc.BASE64Decoder;
7
8 import javax.imageio.ImageIO;
9 import java.awt.image.BufferedImage;
10 import java.io.*;
11
12
13 public class ImageEncodeUtil {
14 private final static Logger logger = Logger.getLogger(ImageEncodeUtil.class);
15
16 //1-压缩图片
17 public static InputStream compressFile(InputStream input) throws IOException {
18 //1-压缩图片
19 BufferedImage bufImg = ImageIO.read(input);// 把图片读入到内存中
20 bufImg = Thumbnails.of(bufImg).width(100).keepAspectRatio(true).outputQuality(0.2f).asBufferedImage();//压缩:宽度100px,长度自适应;质量压缩到0.1
21 ByteArrayOutputStream bos = new ByteArrayOutputStream();// 存储图片文件byte数组
22 ImageIO.write(bufImg, "jpg", bos); // 图片写入到 ImageOutputStream
23 input = new ByteArrayInputStream(bos.toByteArray());
24 int available = input.available();
25 //2-如果大小超过50KB，继续压缩
26 if(available > 50000){
27 compressFile(input);
28 }
29 return input;
30
31 }
32 //2-InputStream转化为base64
33 public static String getBase64FromInputStream(InputStream in) {
34 // 将图片文件转化为字节数组字符串，并对其进行Base64编码处理
35 byte[] data = null;
36 // 读取图片字节数组
37 try {
38 ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
39 byte[] buff = new byte[100];
40 int rc = 0;
41 while ((rc = in.read(buff, 0, 100)) > 0) {
42 swapStream.write(buff, 0, rc);
43 }
44 data = swapStream.toByteArray();
45 } catch (IOException e) {
46 e.printStackTrace();
47 } finally {
48 if (in != null) {
49 try {
50 in.close();
51 } catch (IOException e) {
52 e.printStackTrace();
53 }
54 }
55 }
56 String str = new String(Base64.encodeBase64(data));
57 System.out.println( "str length: " + str.length() + " str: " + str);
58 return str;
59 }
60
61 //3-Base64解码并生成图片
62 public static boolean GenerateImage(String base64str,String savepath) { //对字节数组字符串进行Base64解码并生成图片
63 if (base64str == null) //图像数据为空
64 return false;
65 BASE64Decoder decoder = new BASE64Decoder();
66 try {
67 //Base64解码
68 byte[] b = decoder.decodeBuffer(base64str);
69 // System.out.println("解码完成");
70 for (int i = 0; i < b.length; ++i) {
71 if (b[i] < 0) {//调整异常数据（这一步很重要）
72 b[i] += 256;
73 }
74 }
75 //生成jpeg图片
76 OutputStream out = new FileOutputStream(savepath);
77 out.write(b);
78 out.flush();
79 out.close();
80 return true;
81 } catch (Exception e) {
82 return false;
83 }
84 }
85
86 public static void main(String[] args) {
87 try {
88 File file = new File("C:\\Users\\tyj\\Desktop\\01.jpg");
89 FileInputStream fileInputStream = new FileInputStream(file);
90 InputStream inputStream = compressFile(fileInputStream);
91 String base64FromInputStream = getBase64FromInputStream(inputStream);
92 GenerateImage(base64FromInputStream,"C:\\\\Users\\\\tyj\\\\Desktop\\\\113001.jpg");
93 InputStream is =new ByteArrayInputStream(base64FromInputStream.getBytes("UTF-8"));
94 System.out.println("compress success");
95 } catch (IOException e) {
96 // TODO Auto-generated catch block
97 e.printStackTrace();
98 }
99 }
100
101 }
net.coobird
thumbnailator
0.4.8
2-InputStream转化为base64
3-Base64解码并生成图片，注意其中的标红部分，调整异常数据（这一步很重要）
