异常处理

• 配置文件添加异常处理器

  <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/pages/" />
    <property name="suffix" value=".jsp"/>
  </bean>

• 添加自定义异常类

  package com.oylong.Exception;
  
  public class IException extends Exception {
      private String msg;
  
      public IException(String msg) {
          this.msg = msg;
      }
  
      public String getMsg() {
          return msg;
      }
  
      public void setMsg(String msg) {
          this.msg = msg;
      }
  }

• 添加自定义异常处理器

  package com.oylong.Exception;
  
  import org.springframework.web.servlet.HandlerExceptionResolver;
  import org.springframework.web.servlet.ModelAndView;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  public class IExceptionResolver implements HandlerExceptionResolver {
      @Override
      public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {
          IException iException = null;
          if (e instanceof IException) {
              iException = (IException) e;
          } else {
              iException = new IException("未知的错误");
          }
          ModelAndView modelAndView = new ModelAndView();
          modelAndView.addObject("errorMsg", iException.getMsg());
          return modelAndView;
      }
  }

• 配置文件中添加bean

  <bean id="iExceptionResolver" class="com.oylong.Exception.IExceptionResolver"></bean>

• 运行时抛出IException即可