springmvc 使用jsr303校验返回400错误

如果一个方法中有参数被 @Valid 标注了，但该参数后面没有紧跟一个 BindingResult 类型的参数，那么提交到该方法时，将返回 400 错误。
错误消息将会是：The request sent by the client was syntactically incorrect ().

错误的方法定义 1 ：（错误原因：没有 BindingResult 参数）

@RequestMapping({"error400" })
public String error400(@Valid @ModelAttribute("testForm") TestForm testForm) {
    return"test";
}
错误的方法定义 2 ：（错误原因：没有紧跟在 @Valid 参数之后）

@RequestMapping({"error400" })
public String error400(@Valid @ModelAttribute("testForm") TestForm testForm, Model model, Errors result) {
    return"demo/front/test";
}
也可参考 DefaultHandlerExceptionResolver.java 中的方法说明：

/**
* Handle the case where an {@linkplain ModelAttribute @ModelAttribute} method
* argument has binding or validation errors and is not followed by another
* method argument of type {@link BindingResult}.
* By default an HTTP 400 error is sent back to the client.
* @param request current HTTP request
* @param response current HTTP response
* @param handler the executed handler
* @return an empty ModelAndView indicating the exception was handled
* @throws IOException potentially thrown from response.sendError()
*/
protectedModelAndView handleBindException(BindException ex, HttpServletRequest request,
        HttpServletResponse response, Object handler)throws IOException {
    response.sendError(HttpServletResponse.SC_BAD_REQUEST);
    returnnew ModelAndView();
}

转自：http://blog.csdn.net/lougnib/article/details/9973257