threadLoccal 里面有什么?

老外的:

package util;import java.lang.ref.Reference;import java.lang.reflect.Field;import java.util.Arrays;public class ThreadLocalUtil { public static  void dumphreadLocals() {        try {            // Get a reference to the thread locals table of the current thread            Thread thread = Thread.currentThread();            Field threadLocalsField = Thread.class.getDeclaredField("threadLocals");            threadLocalsField.setAccessible(true);            Object threadLocalTable = threadLocalsField.get(thread);            // Get a reference to the array holding the thread local variables inside the            // ThreadLocalMap of the current thread            @SuppressWarnings("rawtypes")Class threadLocalMapClass = Class.forName("java.lang.ThreadLocal$ThreadLocalMap");            Field tableField = threadLocalMapClass.getDeclaredField("table");            tableField.setAccessible(true);            Object[] table = (Object[]) tableField.get(threadLocalTable);            @SuppressWarnings("rawtypes")Class threadLocalMapEntryClass = Class.forName("java.lang.ThreadLocal$ThreadLocalMap$Entry");            Field entryValueField = threadLocalMapEntryClass.getDeclaredField("value");            entryValueField.setAccessible(true);            // The key to the ThreadLocalMap is a WeakReference object. The referent field of this object            // is a reference to the actual ThreadLocal variable            Field referentField = Reference.class.getDeclaredField("referent");            referentField.setAccessible(true);            for (Object entry:table) {                // Each entry in the table array of ThreadLocalMap is an Entry object                // representing the thread local reference and its value                if (entry != null) {                Object tlcValue=entryValueField.get(entry);                    //ThreadLocal threadLocal = (ThreadLocal)referentField.get(entry);                    //System.out.println("thread local  value "+tlcValue);                    printObject(tlcValue);                }            }        } catch(Exception e) {            // We will tolerate an exception here and just log it            throw new IllegalStateException(e);        }    } @SuppressWarnings("rawtypes")private static void printObject(Object obj) { System.out.print("find threadlocal var :"); if(obj instanceof Object[]) { System.out.println(Arrays.deepToString((Object[]) obj)); }else if (obj instanceof java.lang.ref.Reference) { java.lang.ref.Reference ref=(Reference) obj; System.out.println(" ref "+ref.getClass().getName()+" ref to "+ref.get()); }else { System.out.println(obj); } }public static void main(String[] args) throws NoSuchMethodException, SecurityException{dumphreadLocals();}}

偶自己的:

import java.lang.reflect.Field;import java.lang.reflect.Method;//import java.lang.StringCoding;public class testThreadLoacal {/** * @param args * @throws SecurityException  * @throws NoSuchFieldException  */public static void main(String[] args) throws Exception {Thread t = Thread.currentThread();//获取threadLocals对象Object threadLocals = getField(t,"threadLocals");//获取table对象啊Object table = getField(threadLocals, "table");Object[] tableArray = null;if(table.getClass().isArray()) {//数组强转tableArray = (Object[])table;//转换为数组,迭代entryfor(int i = 0 ; i < tableArray.length ; i++) {//System.out.println(tableArray[i]);if(null != tableArray[i] ) {//打印valueObject value = getField(tableArray[i],"value");System.out.println("====================");printFiledNames(value);System.out.println("====================");System.out.println(value);if(value != null){//获取refer的链接对象,可以不用反射了,直接强转为ReferenceMethod getMethod = value.getClass().getMethod("get");Object softReference = getMethod.invoke(value);System.out.println(softReference);for(Method method : softReference.getClass().getDeclaredMethods()){System.out.println(method.getName());}// System.out.println(getField(value,"referent"));;}}}}//Field[] fields = threadLocalsClazz.getDeclaredFields();System.out.println(table);}public static Object getField(Object instance ,String fieldName) throws Exception {Class threadLocalsClazz = instance.getClass();Field tableField = threadLocalsClazz.getDeclaredField(fieldName);tableField.setAccessible(true);Object table = tableField.get(instance);return table;}public static void printFiledNames(Object object) {Field[] fields = object.getClass().getFields();for(int i = 0 ; i < fields.length;i++) {System.out.println(fields[i].getName());}}}