项目中调用service层方法

使用的工具类

package com.fltd.tourism.util;

import java.util.Locale;
import java.util.Map;

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class SpringContextUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext = null;

    public void setApplicationContext(ApplicationContext context) throws BeansException {
        applicationContext = context;
    }

    /**
     * 获取applicationContext对象
     * 
     * @return
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    @SuppressWarnings("unchecked")
    public static <T> T getBean(String name) {
        return (T) applicationContext.getBean(name);
    }

    public static <T> T getBean(Class<T> clazz) {
        System.out.println(applicationContext);
        return applicationContext.getBean(clazz);
    }

    /**
     * 根据bean的id来查找对�?
     * 
     * @param id
     * @return
     */

    @SuppressWarnings("unchecked")
    public static <T> T getBeanById(String id) {
        return (T) applicationContext.getBean(id);
    }

    /**
     * 根据bean的class来查找对�?
     * 
     * @param c
     * @return
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static <T> T getBeanByClass(Class c) {
        return (T) applicationContext.getBean(c);
    }

    /**
     * 根据bean的class来查找所有的对象(包括子类)
     * 
     * @param c
     * @return
     */
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public static Map getBeansByClass(Class c) {
        return applicationContext.getBeansOfType(c);
    }

    public static String getMessage(String key) {
        return applicationContext.getMessage(key, null, Locale.getDefault());
    }

}

使用方法：

SpringContextUtil.getBean(xxxService.class).xxxmethod();

或者使用

在项目中遇到一个问题，在 Filter中注入 Serivce失败，注入的service始终为null。如下所示：

1 public class WeiXinFilter implements Filter{
 2     
 3     @Autowired
 4     private UsersService usersService;
 5 
 6     public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
 7         HttpServletRequest req = (HttpServletRequest)request;
 8         HttpServletResponse resp = (HttpServletResponse)response;
 9 　　　　 Users users = this.usersService.queryByOpenid(openid);
10 }