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    Spring自定义参数解析器代码实例

    栏目:代码类 时间:2019-12-02 15:09

    这篇文章主要介绍了Spring自定义参数解析器代码实例,文中通过示例代码介绍的非常详细,对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下

    结合redis编写User自定义参数解析器UserArgumentResolver

    import javax.servlet.http.Cookie;
    import javax.servlet.http.HttpServletRequest;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.core.MethodParameter;
    import org.springframework.stereotype.Service;
    import org.springframework.web.bind.support.WebDataBinderFactory;
    import org.springframework.web.context.request.NativeWebRequest;
    import org.springframework.web.method.support.HandlerMethodArgumentResolver;
    import org.springframework.web.method.support.ModelAndViewContainer;
    import cn.xingaohbd.seckil.model.User;
    import cn.xingaohbd.seckil.service.UserService;
    
    @Service
    public class UserArgumentResolver implements HandlerMethodArgumentResolver {
    
      @Autowired
      public UserService userService;
      
      public String getParameterCokies(HttpServletRequest request,String tokenName){
        Cookie[] cookies = request.getCookies();
        for (Cookie ck : cookies) {
          if(ck.getName().equals(tokenName)){
            return ck.getValue();
          }
        }
        return null;
      }
      
      @Override
      public boolean supportsParameter(MethodParameter methodParameter) {
        Class<?> p_class = methodParameter.getParameterType();
        return p_class == User.class;
      }
    
      @Override
      public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
          NativeWebRequest nativeWebRequest, WebDataBinderFactory binderFactory) throws Exception {
        HttpServletRequest request = nativeWebRequest.getNativeRequest(HttpServletRequest.class);
        String requestParameter_token = request.getParameter("token");
        String cokies_token = getParameterCokies(request, "token");
        if(requestParameter_token == null && cokies_token == null){
          return null;
        }
        return userService.getUserFromRedisByToken(requestParameter_token != null ? requestParameter_token : cokies_token);
      }
    
    }

    UserService

    @Service
    @Transactional
    public class UserServiceImpl implements UserService {
      @Autowired
      private UserRedis userRedis;
    
      @Override
      public Object getUserFromRedisByToken(String token) {
        return userRedis.get(token);
      }
    }

    在WebConfig中注册自定义参数解析器UserArgumentResolver

    import java.util.List;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.util.ResourceUtils;
    import org.springframework.web.method.support.HandlerMethodArgumentResolver;
    import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
    import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
    
    @Configuration
    public class WebConfig extends WebMvcConfigurationSupport{
    
      @Autowired
      UserArgumentResolver userArgumentResolver;
      
      @Override
      protected void addArgumentResolvers(List<HandlerMethodArgumentResolver> argumentResolvers) {
        argumentResolvers.add(userArgumentResolver);
      }
    
      public void addResourceHandlers(ResourceHandlerRegistry registry){
        registry.addResourceHandler("/**").addResourceLocations(ResourceUtils.CLASSPATH_URL_PREFIX+"/static/");
        super.addResourceHandlers(registry);
      }
    }