token验证，如果验证失败，抛出自定义异常，返回结果固定格式

Posted 2020-11-17 jeanfear

spring-mvc.xml

<!-- json转换器 -->
    <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" id="jsonMessageConverter">
    </bean>
 
    <!-- 统一异常处理类，需要在web.xml中将默认的异常处理器关闭 -->
    <bean class="com.xxx.common.fitter.TokenExceptionResolver" id="handlerExceptionResolver">
        <!-- 注入一个json转换器 -->
        <property name="jsonMessageConverter" ref="jsonMessageConverter">
    </property></bean>

切面类

只是满足条件后，抛出异常

throw new TokenException("无权限");

TokenExceptionResolver类

 import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.http.HttpOutputMessage;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.HttpMessageNotWritableException;
import org.springframework.http.server.ServletServerHttpResponse;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

import com.xxx.common.bean.JsonResultBean;
import com.xxx.common.util.EifiniConstant;
import com.xxx.common.exception.TokenException;
 
 public class TokenExceptionResolver implements HandlerExceptionResolver{
    // json转换器
        // 将异常信息转json
        private HttpMessageConverter<JsonResultBean> jsonMessageConverter;
     
        public HttpMessageConverter<JsonResultBean> getJsonMessageConverter() {
            return jsonMessageConverter;
        }
        //依赖注入三种方式之一setter注入
        public void setJsonMessageConverter(
                HttpMessageConverter<JsonResultBean> jsonMessageConverter) {
            this.jsonMessageConverter = jsonMessageConverter;
        }
        
    @Override
    public ModelAndView resolveException(HttpServletRequest request,
            HttpServletResponse response, Object handler, Exception ex) {
        TokenException tokenException;
        if(ex instanceof TokenException){
            tokenException = (TokenException)ex;
            // 异常信息解析
            HttpOutputMessage outputMessage = new ServletServerHttpResponse(response);
     
            try {
                //将exceptionResultInfo对象转成json输出,这里使用spring异常处理的工具
                jsonMessageConverter.write(new JsonResultBean(EifiniConstant.ERROR,tokenException.getMessage()), MediaType.APPLICATION_JSON, outputMessage);
            } catch (HttpMessageNotWritableException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }else{
//            tokenException = new TokenException("未知错误");
        }
        return new ModelAndView();
    }
 
    
 }