java get all threadlocal from thread

public void mytest() {    long start = System.currentTimeMillis();    Thread thread = Thread.currentThread();

    Field threadLocalsField = null;    try {        threadLocalsField = Thread.class.getDeclaredField("threadLocals");

        threadLocalsField.setAccessible(true);

        Class threadLocalMapKlazz = Class.forName("java.lang.ThreadLocal$ThreadLocalMap");        Field tableField = threadLocalMapKlazz.getDeclaredField("table");        tableField.setAccessible(true);

        Object table = tableField.get(threadLocalsField.get(thread));

        int threadLocalCount = Array.getLength(table);        StringBuilder sb = new StringBuilder();        StringBuilder classSb = new StringBuilder();

        int leakCount = 0;

        for (int i = 0; i < threadLocalCount; i++) {            Object entry = Array.get(table, i);            if (entry != null) {                Field valueField = entry.getClass().getDeclaredField("value");                valueField.setAccessible(true);                Object value = valueField.get(entry);                if (value != null) {                    classSb.append(value.getClass().getName()).append(", ");

                } else {                    classSb.append("null, ");                }                leakCount++;            }        }

        sb.append("possible ThreadLocal leaks: ")                .append(leakCount)                .append(" of ")                .append(threadLocalCount)                .append(" = [")                .append(classSb.substring(0, classSb.length() - 2))                .append("] ");

        log.warn(sb.toString());    } catch (Exception e) {        e.printStackTrace();    }    long end = System.currentTimeMillis();    long cost = end - start;    log.info("获取ThreadLocal耗时:{}", cost);

结果： possible ThreadLocal leaks: 9 of 16 = [java.util.Collections$SynchronizedMap, null, java.lang.Boolean, java.lang.Boolean, null, java.lang.Integer, java.lang.Boolean, brave.propagation.TraceContext, null] 

原文地址：https://www.cnblogs.com/zhangzhi19861216/p/12152973.html