通过ResponseEntity
通过ResponseEntity接收两个参数,一个是对象,一个是HttpStatus.
举例:
@RequestMapping(value="/customer/{id}" )
public ResponseEntity<Customer> getCustomerById(@PathVariable String id)
{
Customer customer;
try
{
customer = customerService.getCustomerDetail(id);
}
catch (CustomerNotFoundException e)
{
return new ResponseEntity<Customer>(HttpStatus.NOT_FOUND);
}
return new ResponseEntity<Customer>(customer,HttpStatus.OK);
}
这种方法的话我们得在每个RequestMapping 方法中加入try catch语句块,比较麻烦,下面介绍个更简单点的方法
通过ExceptionHandler注解
这里跟前面不同的是,我们注解方法的返回值不是一个ResponseEntity对象,而不是跳转的页面。
@RequestMapping(value="/customer/{id}" )
@ResponseBody
public Customer getCustomerById(@PathVariable String id) throws CustomerNotFoundException
{
return customerService.getCustomerDetail(id);
}
@ExceptionHandler(CustomerNotFoundException.class)
public ResponseEntity<ClientErrorInformation> rulesForCustomerNotFound(HttpServletRequest req, Exception e)
{
ClientErrorInformation error = new ClientErrorInformation(e.toString(), req.getRequestURI());
return new ResponseEntity<ClientErrorInformation>(error, HttpStatus.NOT_FOUND);
}
总结:
这里两种方法,推荐使用第二种,我们既可以在单个Controller中定义,也可以在标有ControllerAdvice注解的类中定义从而使异常处理对整个程序有效。
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