上传代码

src/main/java/com/nis/web/security/IdGen.java

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+package com.nis.web.security;
+
+import java.io.Serializable;
+import java.security.SecureRandom;
+import java.util.UUID;
+
+import org.apache.shiro.session.Session;
+import org.apache.shiro.session.mgt.eis.SessionIdGenerator;
+import org.springframework.context.annotation.Lazy;
+import org.springframework.stereotype.Service;
+
+import com.nis.util.Encodes;
+
+/**
+ * 封装各种生成唯一性ID算法的工具类.
+ * @author 
+ * @version 2013-01-15
+ */
+@Service
+@Lazy(false)
+public class IdGen implements  SessionIdGenerator {
+
+	private static SecureRandom random = new SecureRandom();
+	
+	/**
+	 * 封装JDK自带的UUID, 通过Random数字生成, 中间无-分割.
+	 */
+	public static String uuid() {
+		return UUID.randomUUID().toString().replaceAll("-", "");
+	}
+	
+	/**
+	 * 使用SecureRandom随机生成Long. 
+	 */
+	public static long randomLong() {
+		return Math.abs(random.nextLong());
+	}
+
+	/**
+	 * 基于Base62编码的SecureRandom随机生成bytes.
+	 */
+	public static String randomBase62(int length) {
+		byte[] randomBytes = new byte[length];
+		random.nextBytes(randomBytes);
+		return Encodes.encodeBase62(randomBytes);
+	}
+	
+	/**
+	 * Activiti ID 生成
+	 */
+	public String getNextId() {
+		return IdGen.uuid();
+	}
+
+	@Override
+	public Serializable generateId(Session session) {
+		return IdGen.uuid();
+	}
+	
+	public static void main(String[] args) {
+		System.out.println(IdGen.uuid());
+		System.out.println(IdGen.uuid().length());
+		System.out.println(new IdGen().getNextId());
+		for (int i=0; i<1000; i++){
+			System.out.println(IdGen.randomLong() + "  " + IdGen.randomBase62(5));
+		}
+	}
+
+}