消息摘要类加入crc32 和 murmurhash

hotsmile · Nov 14, 2015 · 16e96e6 · 16e96e6
1 parent 4b7a491
commit 16e96e6
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Showing 2 changed files with 54 additions and 4 deletions.
diff --git a/modules/utils/src/main/java/org/springside/modules/utils/Digests.java b/modules/utils/src/main/java/org/springside/modules/utils/Digests.java
@@ -17,9 +17,11 @@
 import com.google.common.hash.Hashing;
 
 /**
- * 支持SHA-1/MD5/CRC32消息摘要的工具类.
+ * 消息摘要的工具类.
  * 
- * 返回ByteSource，可用Encodes进一步被编码为Hex, Base64或UrlSafeBase64
+ * 支持SHA-1/MD5这些安全性较高，返回byte[]的(可用Encodes进一步被编码为Hex, Base64或UrlSafeBase64).
+ * 
+ * 也支持crc32，murmur32这些不追求安全性，性能较高，返回int的.
  * 
  * @author calvin
  */
@@ -126,11 +128,27 @@ private static byte[] digest(InputStream input, String algorithm) throws IOExcep
 		}
 	}
 
-	public int crc32(byte[] input) {
+	public static int crc32(byte[] input) {
 		return Hashing.crc32().hashBytes(input).asInt();
 	}
 
-	public int crc32(String input) {
+	public static int crc32(String input) {
 		return Hashing.crc32().hashString(input, UTF8).asInt();
 	}
+
+	public static int murmur32(byte[] input) {
+		return Hashing.murmur3_32().hashBytes(input).asInt();
+	}
+
+	public static int murmur32(String input) {
+		return Hashing.murmur3_32().hashString(input, UTF8).asInt();
+	}
+
+	public static int murmur32(byte[] input, int seed) {
+		return Hashing.murmur3_32(seed).hashBytes(input).asInt();
+	}
+
+	public static int murmur32(String input, int seed) {
+		return Hashing.murmur3_32(seed).hashString(input, UTF8).asInt();
+	}
 }
diff --git a/modules/utils/src/test/java/org/springside/modules/utils/DigestsTest.java b/modules/utils/src/test/java/org/springside/modules/utils/DigestsTest.java
@@ -37,4 +37,36 @@ public void digestFile() throws IOException {
 		System.out.println("md5: " + Encodes.encodeHex(md5result));
 		System.out.println("sha1:" + Encodes.encodeHex(sha1result));
 	}
+
+	@Test
+	public void crc32String() {
+
+		String input = "user1";
+		int result = Digests.crc32(input);
+		System.out.println("crc32 for user1:" + result);
+
+		input = "user2";
+		result = Digests.crc32(input);
+		System.out.println("crc32 for user2:" + result);
+	}
+
+	@Test
+	public void murmurString() {
+
+		String input1 = "user1";
+		int result = Digests.murmur32(input1);
+		System.out.println("murmur32 for user1:" + result);
+
+		String input2 = "user2";
+		result = Digests.murmur32(input2);
+		System.out.println("murmur32 for user2:" + result);
+
+		int seed = (int) System.currentTimeMillis();
+		result = Digests.murmur32(input1, seed);
+		System.out.println("murmur32 with seed for user1:" + result);
+
+		result = Digests.murmur32(input2, seed);
+		System.out.println("murmur32 with seed for user2:" + result);
+
+	}
 }