图片Base64编码并压缩，转码解压工具

Author: scalad

Java_Photo_Base64AndZip/README.md

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+###图片转Base64并压缩
+
+首先需要Apache下的两个jar包
+
+		<!-- https://mvnrepository.com/artifact/commons-codec/commons-codec -->
+		<dependency>
+		    <groupId>commons-codec</groupId>
+		    <artifactId>commons-codec</artifactId>
+		    <version>1.10</version>
+		</dependency>
+		<!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
+		<dependency>
+		    <groupId>commons-io</groupId>
+		    <artifactId>commons-io</artifactId>
+		    <version>2.4</version>
+		</dependency>
+```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;
+		}
+	
+	}
+```