Spring MVC——异常捕获

1. 自定义异常类
public class CustomerException extends Exception {

private String message;

public CustomerException() {
super();
}

public CustomerException(String message) {
super(message);

this.message = message;
}

public String getMessage() {
return message;
}

public void setMessage(String message) {
this.message = message;
}
}

2. 定义异常处理器，并实现org.springframework.web.servlet.HandlerExceptionResolver接口
public class CustomerExceptionHandler implements HandlerExceptionResolver {

@Override
public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler,Exception ex) {

CustomerException cex = null;
if(ex instanceof CustomerException)
{
cex = (CustomerException)ex;
}
else
{
cex = new CustomerException("未知错误！！");
}

System.out.println("异常：" + cex.getMessage());

ModelAndView modelAndView = new ModelAndView();

//保存错误信息
modelAndView.addObject("errorMsg", cex.getMessage());

//指定跳转视图
modelAndView.setViewName("error");

return modelAndView;
}

}

3. 在spring-mvc.xml中配置全局异常处理器
<!-- 自定义全局异常处理器，因为实现了org.springframework.web.servlet.HandlerExceptionResolver接口 -->
<bean class="com.neuedu.exception.CustomerExceptionHandler"></bean>

4. 在error.jsp页面显示异常处理器保存的异常信息

对不起，您的操作引发了异常：${errorMsg}

5. 异常类应用

定义dao、service、controller,并在任意层制造异常

6. 测试

http://localhost:8088/springMvc_06_exception/index.jsp