zip it

xhpc-modules/xhpc-common/src/main/java/com/xhpc/common/Compressor.java

@@ -0,0 +1,100 @@
+package com.xhpc.common;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.Base64;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.GZIPOutputStream;
+
+public class Compressor {
+
+
+    /**
+     * 使用gzip压缩字符串
+     */
+    public static String compress(String str) {
+
+        if (str == null || str.length() == 0) {
+            return str;
+        }
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        GZIPOutputStream gzip = null;
+        try {
+            gzip = new GZIPOutputStream(out);
+            gzip.write(str.getBytes());
+        } catch (IOException e) {
+            e.printStackTrace();
+        } finally {
+            if (gzip != null) {
+                try {
+                    gzip.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+        }
+        return new String(Base64.getEncoder().encode(out.toByteArray()));
+    }
+
+    /**
+     * 使用gzip解压缩
+     */
+    public static String uncompress(String compressedStr) {
+
+        if (compressedStr == null || compressedStr.length() == 0) {
+            return compressedStr;
+        }
+
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        ByteArrayInputStream in = null;
+        GZIPInputStream ginzip = null;
+        byte[] compressed = null;
+        String decompressed = null;
+        try {
+            compressed = Base64.getDecoder().decode(compressedStr);
+            in = new ByteArrayInputStream(compressed);
+            ginzip = new GZIPInputStream(in);
+            byte[] buffer = new byte[1024];
+            int offset = -1;
+            while ((offset = ginzip.read(buffer)) != -1) {
+                out.write(buffer, 0, offset);
+            }
+            decompressed = out.toString();
+        } catch (IOException e) {
+            e.printStackTrace();
+        } finally {
+            if (ginzip != null) {
+                try {
+                    ginzip.close();
+                } catch (IOException e) {
+                }
+            }
+            if (in != null) {
+                try {
+                    in.close();
+                } catch (IOException e) {
+                }
+            }
+            if (out != null) {
+                try {
+                    out.close();
+                } catch (IOException e) {
+                }
+            }
+        }
+        return decompressed;
+    }
+
+    public static void main(String[] args) {
+
+        String compress = compress("2020年9月8日 — 背景Redis缓存的字符串过大时会有问题。不超过10KB最好，最大不能超过1MB。有几个热点配置缓存，5分钟命中一次，大小在5KB到6MB" +
+                "不等，因此需要压缩。");
+        System.out.println(compress);
+        System.out.println(compress.length());
+        String uncompress = uncompress(compress);
+        System.out.println(uncompress);
+        System.out.println(uncompress.length());
+    }
+
+}