package com.ruoyi.common.utils;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.util.zip.GZIPInputStream;
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import java.util.zip.GZIPOutputStream;
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/**
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* 压缩解压工具类
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*/
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public class GZipUtil {
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/**
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* 压缩
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* @param str
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* @return
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*/
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public static String compress(String str) {
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if (str == null || str.trim().length() == 0) {
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return null;
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}
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try (ByteArrayOutputStream out = new ByteArrayOutputStream();
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GZIPOutputStream gzip = new GZIPOutputStream(out)) {
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gzip.write(str.getBytes("utf-8"));
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gzip.close();
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return new String(out.toByteArray(), "iso-8859-1");
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} catch (Exception e) {
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e.printStackTrace();
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return str;
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}
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}
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/**
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* 解压
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* @param str
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* @return
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*/
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public static String uncompress(String str) {
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if (str == null || str.trim().length() == 0) {
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return null;
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}
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try (ByteArrayOutputStream out = new ByteArrayOutputStream();
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ByteArrayInputStream in = new ByteArrayInputStream(str.getBytes("iso-8859-1"))){
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GZIPInputStream ungzip = new GZIPInputStream(in);
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byte[] buffer = new byte[1024];
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int n;
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while ((n = ungzip.read(buffer)) >= 0) {
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out.write(buffer, 0, n);
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}
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return new String(out.toByteArray(), "utf-8");
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} catch (Exception e) {
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e.printStackTrace();
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return str;
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}
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}
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}
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