利用ThreadLocal实现全局上下文工具类_通用全局上下文工具类

/**
 * 全局上下文工具类,用于储存一些东西
 */
public class MyContext {
    private static final ThreadLocal<Map<Object, Object>> mycontext = new ThreadLocal<Map<Object, Object>>() {
        @Override
        protected Map<Object, Object> initialValue() {
            return new HashMap<Object, Object>();
        }
 
    };
 
    /**
     * 根据key获取值
     * @param key
     * @return
     */
    public static Object getValue(Object key) {
        if(mycontext.get() == null) {
            return null;
        }
        return mycontext.get().get(key);
    }
 
    /**
     * 存储
     * @param key
     * @param value
     * @return
     */
    public static Object setValue(Object key, Object value) {
        Map<Object, Object> cacheMap = mycontext.get();
        if(cacheMap == null) {
            cacheMap = new HashMap<Object, Object>();
            mycontext.set(cacheMap);