com.collin.joyous.web.util.SpringUtil.java Source code

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Here is the source code for com.collin.joyous.web.util.SpringUtil.java

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/**
 * Copyright (c) 2005-2012 https://github.com/zhangkaitao
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 */
package com.collin.joyous.web.util;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang3.Validate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

public final class SpringUtil implements ApplicationContextAware, DisposableBean {

    private static ApplicationContext applicationContext = null;

    private static Logger logger = LoggerFactory.getLogger(SpringUtil.class);

    /**
     * ?????ApplicationContext.
     */
    public static ApplicationContext getApplicationContext() {
        assertContextInjected();
        return applicationContext;
    }

    /**
     * ????applicationContext?Bean, .
     */
    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) {
        assertContextInjected();
        return (T) applicationContext.getBean(name);
    }

    /**
     * ????applicationContext?Bean, .
     */
    public static <T> T getBean(Class<T> requiredType) {
        assertContextInjected();
        return applicationContext.getBean(requiredType);
    }

    /**
     * SpringContextHolderApplicationContextNull.
     */
    public static void clearHolder() {
        logger.debug("SpringContextHolderApplicationContext:" + applicationContext);
        applicationContext = null;
    }

    /**
     * ApplicationContextAware?, Context????.
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) {
        // logger.debug("ApplicationContextSpringContextHolder:{}",
        // applicationContext);

        if (SpringUtil.applicationContext != null) {
            logger.warn("SpringContextHolderApplicationContext, ApplicationContext:"
                    + SpringUtil.applicationContext);
        }

        SpringUtil.applicationContext = applicationContext; // NOSONAR
    }

    /**
     * DisposableBean?, Context?????.
     */
    @Override
    public void destroy() throws Exception {
        SpringUtil.clearHolder();
    }

    /**
     * ApplicationContext?.
     */
    private static void assertContextInjected() {
        Validate.validState(applicationContext != null,
                "applicaitonContext, applicationContext.xmlSpringContextHolder.");
    }

    /**
     * ?HttpServletRequest
     * 
     * @return
     */
    public static HttpServletRequest getRequest() {
        RequestAttributes ra = RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = ((ServletRequestAttributes) ra).getRequest();
        return request;
    }
}