Spring Boot(六十四)：SpringBoot集成Gzip压缩数据

package com.example.demo.util; import java.io.*; import java.util.zip.GZIPInputStream; import java.util.zip.GZIPOutputStream; public class GZIPUtils { public static final String GZIP_ENCODE_UTF_8 = "UTF-8"; /** * 字符串压缩为GZIP字节数组 * * @param str * @return */ public static byte[] compress(String str) { return compress(str, GZIP_ENCODE_UTF_8); } /** * 字符串压缩为GZIP字节数组 * * @param str * @param encoding * @return */ public static byte[] compress(String str, String encoding) { if (str == null || str.length() == 0) { return null; } ByteArrayOutputStream out = new ByteArrayOutputStream(); GZIPOutputStream gzip; try { gzip = new GZIPOutputStream(out); gzip.write(str.getBytes(encoding)); gzip.close(); } catch (IOException e) { e.printStackTrace(); } return out.toByteArray(); } /** * GZIP解压缩 * * @param bytes * @return */ public static byte[] uncompress(byte[] bytes) { if (bytes == null || bytes.length == 0) { return null; } ByteArrayOutputStream out = new ByteArrayOutputStream(); ByteArrayInputStream in = new ByteArrayInputStream(bytes); try { GZIPInputStream ungzip = new GZIPInputStream(in); byte[] buffer = new byte[256]; int n; while ((n = ungzip.read(buffer)) >= 0) { out.write(buffer, 0, n); } } catch (IOException e) { e.printStackTrace(); } return out.toByteArray(); } /** * 解压并返回String * * @param bytes * @return */ public static String uncompressToString(byte[] bytes) throws IOException { return uncompressToString(bytes, GZIP_ENCODE_UTF_8); } /** * @param bytes * @return */ public static byte[] uncompressToByteArray(byte[] bytes) throws IOException { return uncompressToByteArray(bytes, GZIP_ENCODE_UTF_8); } /** * 解压成字符串 * * @param bytes 压缩后的字节数组 * @param encoding 编码方式 * @return 解压后的字符串 */ public static String uncompressToString(byte[] bytes, String encoding) throws IOException { byte[] result = uncompressToByteArray(bytes, encoding); return new String(result); } /** * 解压成字节数组 * * @param bytes * @param encoding * @return */ public static byte[] uncompressToByteArray(byte[] bytes, String encoding) throws IOException { if (bytes == null || bytes.length == 0) { return null; } ByteArrayOutputStream out = new ByteArrayOutputStream(); ByteArrayInputStream in = new ByteArrayInputStream(bytes); try { GZIPInputStream ungzip = new GZIPInputStream(in); byte[] buffer = new byte[256]; int n; while ((n = ungzip.read(buffer)) >= 0) { out.write(buffer, 0, n); } return out.toByteArray(); } catch (IOException e) { e.printStackTrace(); throw new IOException("解压缩失败！"); } } /** * 将字节流转换成文件 * * @param filename * @param data * @throws Exception */ public static void saveFile(String filename, byte[] data) throws Exception { if (data != null) { String filepath = "/" + filename; File file = new File(filepath); if (file.exists()) { file.delete(); } FileOutputStream fos = new FileOutputStream(file); fos.write(data, 0, data.length); fos.flush(); fos.close(); System.out.println(file); } } }