package com.xiaopeng.vehicleConvoy.util;
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import java.security.MessageDigest;
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/**
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* SHA1算法计算散列值的ThreadLocal，避免多线程场景下的线程安全问题<br/>
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*/
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public class ThreadLocalSHA1 {
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private static final ThreadLocal<MessageDigest> localFormat = new ThreadLocal<MessageDigest>() {
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protected MessageDigest initialValue() {
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try {
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return MessageDigest.getInstance("SHA1");
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} catch (Exception e) {
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System.err.println(SHA1Util.class.getName() + "初始化失败，MessageDigest不支持SHA1Util。");
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e.printStackTrace();
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return null;
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}
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};
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};
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/** 获取当前线程对应的实例 */
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public static MessageDigest current() {
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return localFormat.get();
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}
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}
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