第十一章 Thread-Specific Storage

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背景介绍：类似与ThreadLocal，保存每个线程的内容、独有的数据、独有的字段、内存空间

public class Log {  private static final ThreadLocal tsLogCollection = new ThreadLocal();    // 加入一个log    public static void println(String s) {        getTSLog().println(s);    }    // 关闭log    public static void close() {        getTSLog().close();    }    // 取得线程特有的log    private static TSLog getTSLog() {        TSLog tsLog = (TSLog)tsLogCollection.get();        //如果线程是第一次呼叫，就建立新挡案并登陆log        if (tsLog == null) {            tsLog = new TSLog(Thread.currentThread().getName() + "-log.txt");            tsLogCollection.set(tsLog);        }        return tsLog;    }    /*private static PrintWriter writer = null;    static {        try {            writer = new PrintWriter(new FileWriter("log.txt"));        } catch (IOException e) {            e.printStackTrace();        }    }    public static void println(String s) {        writer.println(s);    }    public static void close() {        writer.println("==== End of log ====");        writer.close();    }*/}

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