一、写SpringUtil类来获取Springh管理的类实例,判断是否注入成功，如果没有注入成功重新获取注入
package com.util; import org.springframework.beans.BeansException; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.stereotype.Component; @Component public class SpringUtil implements ApplicationContextAware { private static ApplicationContext applicationContext; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { if (SpringUtil.applicationContext == null) { SpringUtil.applicationContext = applicationContext; } //"ApplicationContext配置成功,在普通类可以通过调用SpringUtils.getAppContext()获取applicationContext对象,applicationContext=" } // 获取applicationContext public static ApplicationContext getApplicationContext() { return applicationContext; } // 通过name获取 Bean. public static Object getBean(String name) { return getApplicationContext().getBean(name); } // 通过class获取Bean. public static <T> T getBean(Class<T> clazz) { return getApplicationContext().getBean(clazz); } // 通过name,以及Clazz返回指定的Bean public static <T> T getBean(String name, Class<T> clazz) { return getApplicationContext().getBean(name, clazz); } }
二、在拦截器中若自动注入没有生效，需要手动判断后，重新赋值
package com.webconfig; import java.util.Date; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.beans.factory.BeanFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import org.springframework.web.context.support.WebApplicationContextUtils; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; import com.entity.TokenEntity; import com.repository.TokenRepository; import com.util.CommonUtil; import sun.misc.BASE64Decoder; @Component public class TokenInterceptor implements HandlerInterceptor { private final static BASE64Decoder decode = new BASE64Decoder(); @Autowired private TokenRepository tokenRep; // 在请求处理之前进行调用（Controller方法调用之前 @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { String token = request.getParameter("token"); String msg = ""; boolean canFilter = false; if (!CommonUtil.isNull(token)) { String tokenStr = new String(decode.decodeBuffer(token)); String[] tokens = tokenStr.split("_"); if (tokens.length == 2) { if (tokenRep == null) { // 解决tokenRep为null无法注入问题 //System.out.println("TokenRepository is null!!!"); BeanFactory factory = WebApplicationContextUtils.getRequiredWebApplicationContext(request.getServletContext()); tokenRep = (TokenRepository) factory.getBean("tokenRepository"); } String userName = tokens[0]; String curToken = tokens[1]; TokenEntity tokenInfo = tokenRep.findByUserName(userName); if (tokenInfo != null) { if (curToken.equals(tokenInfo.getToken())) { tokenInfo.setCreatTime(new Date()); tokenRep.save(tokenInfo); canFilter = true; } else { msg = "The user is logged in elsewhere and token has failed"; } } else { msg = "Token has expired,please get it again"; } } else { msg = "token fomart incorrect"; } } else { msg = "token is empty"; } if (canFilter) { return true; } else { response.setCharacterEncoding("UTF-8"); response.setStatus(HttpServletResponse.SC_UNAUTHORIZED); response.getWriter().println(msg); } return false; } // 请求处理之后进行调用，但是在视图被渲染之前（Controller方法调用之后） @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { // TODO Auto-generated method stub } // 在整个请求结束之后被调用，也就是在DispatcherServlet 渲染了对应的视图之后执行（主要是用于进行资源清理工作） @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { // TODO Auto-generated method stub } }
