Spring中如何自定義參數解析器

本篇文章給大家分享的是有關Spring中如何自定義參數解析器，小編覺得挺實用的，因此分享給大家學習，希望大家閱讀完這篇文章后可以有所收獲，話不多說，跟著小編一起來看看吧。

結合redis編寫User自定義參數解析器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;@Servicepublic 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@Transactionalpublic class UserServiceImpl implements UserService {  @Autowired  private UserRedis userRedis;  @Override  public Object getUserFromRedisByToken(String token) {    return userRedis.get(token);  }}

在WebConfig中注冊自定義參數解析器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;@Configurationpublic 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);  }}

以上就是Spring中如何自定義參數解析器，小編相信有部分知識點可能是我們日常工作會見到或用到的。希望你能通過這篇文章學到更多知識。更多詳情敬請關注億速云行業資訊頻道。