图片转Base64并压缩

DogJay 2019-01-18 后端技术 518人已围观

首先需要Apache下的两个jar包 commons-codec commons-codec 1.10 commons-io commons-io 2.4 ```Java package com.silene.base64; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import java.util.zip.GZIPInputStream; import java.util.zip.GZIPOutputStream; import org.apache.commons.codec.binary.Base64; import org.apache.commons.io.FileUtils; public class TestBase64Zip { public static void main(String[] args) { String base64 = base64("e:\\question.jpg"); System.out.println("经过base64转码和压缩" + base64); decode(base64, "test.jpg", "e:\\"); } /** * 把经过压缩过的base64串解码解压并写入打磁盘中 * @param base64 压缩过的base64串 * @param fileName 文件名 * @param path 路径地址 */ public static void decode(String base64, String fileName, String path) { //解码 byte[] data = Base64.decodeBase64(base64); data = unGZip(data); writeFile(data, fileName, path); } /** * 二进制文件写入文件 * @param data 二进制数据 * @param fileName 文件名 * @param path 路径地址 */ public static void writeFile(byte[] data, String fileName, String path) { try { String url = path + "//" + fileName; FileUtils.writeByteArrayToFile(new File(url), data); } catch (IOException e) { System.out.println("写文件出错" + e); } } /** * 解壓Gzip * @param data * @return */ public static byte[] unGZip(byte[] data){ byte[] b = null; try{ ByteArrayInputStream bis = new ByteArrayInputStream(data); GZIPInputStream gzip = new GZIPInputStream(bis); byte[] buf = new byte[1024]; int num = -1; ByteArrayOutputStream baos = new ByteArrayOutputStream(); while ((num = gzip.read(buf, 0, buf.length)) != -1) { baos.write(buf, 0, num); } b = baos.toByteArray(); baos.flush(); baos.close(); gzip.close(); bis.close(); } catch (Exception ex){ System.out.println("解压数据流出错!!" + ex); } return b; } /** * 读取文件并压缩数据然后转Base64编码 * @param pathName 图片的绝对路径地址 * @return */ public static String base64(String pathName) { byte[] data = getPicData(pathName); if (data == null) { return null; } byte[] zipData = gZip(data); return Base64.encodeBase64String(zipData); } /** * @description 获取图片的二进制数据 * @param pathName 图片的绝对路径地址 * @return */ public static byte[] getPicData(String pathName) { byte[] data = null; try { FileInputStream fi = new FileInputStream(pathName); int length = fi.available(); data = new byte[length]; fi.read(data); fi.close(); } catch (Exception e) { System.out.println(e); } return data; } /*** * @description 压缩GZip * @param data 要压缩的二进制数据 * @return */ public static byte[] gZip(byte[] data) { byte[] b = null; try { ByteArrayOutputStream bos = new ByteArrayOutputStream(); GZIPOutputStream gzip = new GZIPOutputStream(bos); gzip.write(data); gzip.finish(); gzip.close(); b = bos.toByteArray(); bos.close(); } catch (Exception ex) { ex.printStackTrace(); } return b; } } ```

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