图片转Base64并压缩，解压

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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>

代码

    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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