springMVC --全局异常处理（两种方式）

来源：互联网发布：零境网络官网编辑：程序博客网时间：2024/06/03 18:13

首先看springMVC的配置文件：

<!-- 全局异常配置 start -->          <bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">              <property name="exceptionMappings">                  <props>                      <prop key="java.lang.Exception">errors/error</prop>                      <prop key="java.lang.Throwable">errors/err</prop>                  </props>              </property>              <property name="statusCodes">                  <props>                      <prop key="errors/error">500</prop>                      <prop key="errors/404">404</prop>                  </props>              </property>              <!-- 设置日志输出级别，不定义则默认不输出警告等错误日志信息 -->              <property name="warnLogCategory" value="WARN"></property>              <!-- 默认错误页面，当找不到上面mappings中指定的异常对应视图时，使用本默认配置 -->              <property name="defaultErrorView" value="errors/error"></property>              <!-- 默认HTTP状态码 -->              <property name="defaultStatusCode" value="500"></property>          </bean>          <!-- 全局异常配置 end -->

这里主要的类是SimpleMappingExceptionResolver类，和他的父类AbstractHandlerExceptionResolver类。

可以看到源码中和上述配置对应的属性；

另外要注意的是日志

<span style="font-size:14px;"><property name="warnLogCategory" value="WARN"></property></span>

级别设置为WARN：

也可以实现HandlerExceptionResolver接口或者继承SimpleMappingExceptionResolver，写一个自己的异常处理程序

public class SpringMVCSimpleMappingExceptionResolver extends SimpleMappingExceptionResolver {public static final Log log = LogFactory.getLog(SpringMVCSimpleMappingExceptionResolver.class);@Overrideprotected ModelAndView doResolveException(HttpServletRequest request,HttpServletResponse response, Object handler, Exception ex) {ModelAndView mv = null;String accept = request.getHeader("accept");        if (accept != null && !(accept.indexOf("application/json") > -1         || (request.getHeader("X-Requested-With") != null         && request.getHeader("X-Requested-With").indexOf("XMLHttpRequest") > -1))) {            mv = super.doResolveException(request, response, handler, ex);        } else {            try {             // json 请求返回                PrintWriter writer = response.getWriter();                  writer.write(Return.failure((ex.getMessage())));                writer.flush();            } catch (IOException e) {            if (log.isInfoEnabled()) {            log.info(StringUtil.getTrace(e));            }            }        }        doLog((HandlerMethod) handler, ex);        return mv;}/** * 记录异常日志 *  * @param handler * @param excetpion */private void doLog(HandlerMethod handler, Exception excetpion) {        if (log.isEnabledExceptionDb()) {        // 异常信息日志入库        }}}

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