在ServletContextListener中使用Spring管理的bean

package com.tang.back.web.listener;

import java.util.List;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.tang.back.dto.sys.DictionaryDetail;
import com.tang.back.impl.service.DictionaryServiceImpl;

/**
 * 获取系统字典数据，缓存在Application中以提高页面初始化性能
 *
 * @author tang
 * @see [相关类/方法]（可选）
 * @since [产品/模块版本] （可选）
 */
public class DataCacheListener implements ServletContextListener{
    
    private final static String DICTIONARY_CACHE = "dictionary";
    
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        final WebApplicationContext springContext = WebApplicationContextUtils.getWebApplicationContext(sce.getServletContext()); // 关键代码
        final DictionaryServiceImpl dictionaryService = (DictionaryServiceImpl)springContext.getBean("dictionaryService"); // 关键代码
        
        ServletContext application = sce.getServletContext();
        Map<String, List<DictionaryDetail>> dict = dictionaryService.getAllDictionary();
        application.setAttribute(DICTIONARY_CACHE, dict);
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        ServletContext application = sce.getServletContext();
        application.removeAttribute(DICTIONARY_CACHE);
    }

    
}

上面的解决方案来自于stackoverflow：http://stackoverflow.com/questions/4746041/spring-injecting-a-dependency-into-a-servletcontextlistener

这里是另一个获得赞同数最多的答案，没细研究，记录在这里。

@Autowired private Properties props;

@Override
public void contextInitialized(ServletContextEvent sce) {
    WebApplicationContextUtils
        .getRequiredWebApplicationContext(sce.getServletContext())
        .getAutowireCapableBeanFactory()
        .autowireBean(this);

    //Do something with props
    ...
}

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