基于SpringMVC的全局异常处理器介绍

/** 
 * @Title: ExceptionCustom.java
 * @Description: 本地异常
 * @author ChoviWu 
 * @version V1.0 
 */
public class ExceptionCustom extends Exception{

 /**
 * @Fields serialVersionUID : 
 */ 
 private static final long serialVersionUID = 1L;
 private String message;

 /**
  * @return the message
  */
 public String getMessage() {
  return message;
 }

 /**
  * @param message the message to set
  */
 public void setMessage(String message) {
  this.message = message;
 }

 public ExceptionCustom() {
  super();
  // TODO Auto-generated constructor stub
 }

 public ExceptionCustom(String message) {
  super(message);
  this.message = message;
 }
}

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

import org.apache.log4j.Logger;
org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;

/**
 * @Title: SimpleException.java
 * @Description:全局异常处理器
 * @author ChoviWu
 * @version V1.0
 */
public class SimpleExceptionResolver implements HandlerExceptionResolver {

 // 异常对象
 ExceptionCustom exceptionCustom = null;

 private Logger logger = Logger.getLogger(SimpleExceptionResolver.class
   .getSimpleName());

 /**
  * 全局处理异常
  */
 public ModelAndView resolveException(HttpServletRequest request,
   HttpServletResponse response, Object handler, Exception ex) {
  //转化为自定义异常
  exceptionCustom = (ExceptionCustom) ex;
  //判断是否是本地异常
  if (ex instanceof ExceptionCustom) {
   logger.info(ex.getMessage());
  } else {
   …抛出错误
  }
  //获取异常信息
  String message = exceptionCustom.getMessage();
  ModelAndView mv = new ModelAndView();
  //将异常返回到Model
  mv.addObject("xx", message);
  // 指向错误页面
  mv.setViewName("error");
  return null;
 }

}

if (ex instanceof ExceptionCustom) {
   logger.info(ex.getMessage());
  } else {
   …抛出错误
  }

<!-- 全局异常处理器 -->
<bean id="handlerExceptionResolver" class = "xxxx(包名).SimpleExceptionResolver"/>

1SpringMVC 在org.springframework.web.servlet.DispatcherServlet类中声明了
public static final String HANDLER_EXCEPTION_RESOLVER_BEAN_NAME = "handlerExceptionResolver";

private void initHandlerExceptionResolvers(ApplicationContext context) {
  this.handlerExceptionResolvers = null;

  if (this.detectAllHandlerExceptionResolvers) {
   // Find all HandlerExceptionResolvers in the ApplicationContext, including ancestor contexts.
   Map<String, HandlerExceptionResolver> matchingBeans = BeanFactoryUtils
     .beansOfTypeIncludingAncestors(context, HandlerExceptionResolver.class, true, false);
   if (!matchingBeans.isEmpty()) {
    this.handlerExceptionResolvers = new ArrayList<HandlerExceptionResolver>(matchingBeans.values());
    // We keep HandlerExceptionResolvers in sorted order.
    OrderComparator.sort(this.handlerExceptionResolvers);
   }
  }
  else {
   try {
    HandlerExceptionResolver her =
      context.getBean(HANDLER_EXCEPTION_RESOLVER_BEAN_NAME, HandlerExceptionResolver.class);
    this.handlerExceptionResolvers = Collections.singletonList(her);
   }
   catch (NoSuchBeanDefinitionException ex) {
    // Ignore, no HandlerExceptionResolver is fine too.
   }
  }

HandlerExceptionResolver her =context.getBean(HANDLER_EXCEPTION_RESOLVER_BEAN_NAME, HandlerExceptionResolver.class);