JAVA多线程用JDK1.5提供的读写锁实现高并发本地缓存工具类

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package com.study;import java.util.LinkedHashMap;import java.util.Map;import java.util.concurrent.locks.ReadWriteLock;import java.util.concurrent.locks.ReentrantReadWriteLock;public class ReadWriteLockDemo {    private static Map cacheMap = new LinkedHashMap();  public static void main(String[] args) {    ReadWriteLockDemo readWriteLockDemo = new ReadWriteLockDemo();    final CacheUtils cacheUtils = readWriteLockDemo.new CacheUtils();    Thread thread = new Thread(new Runnable() {      @Override      public void run() {        for(Integer index = 0;index <= 100;index ++){          System.out.println(cacheUtils.putCache(index.toString()));        }      }    });    thread.start();        Thread thread2 = new Thread(new Runnable() {      @Override      public void run() {        for(Integer index = 0;index <= 100;index ++){          System.out.println(cacheUtils.putCache(index.toString()));        }      }    });    thread2.start();  }  class CacheUtils {    // 定义一把读写锁    ReadWriteLock readWriteLock = new ReentrantReadWriteLock();    public Object putCache(String key){      //进来时，先用读锁进行上锁      readWriteLock.readLock().lock();      Object value = null;      try {        value = cacheMap.get(key);        if(value == null){          readWriteLock.readLock().unlock();          try {            readWriteLock.writeLock().lock();            if(value == null){              //此处实际上是查询DB              value = "huangkejie" + key;              cacheMap.put(key, value);            }          } catch (Exception e) {            e.printStackTrace();          }finally{            readWriteLock.writeLock().unlock();          }          readWriteLock.readLock().lock();        }      } catch (Exception error) {        error.printStackTrace();      } finally{        readWriteLock.readLock().unlock();      }      return value;    }  }}

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