SpringMvc异常处理

1、HandlerExceptionResolver实现

这里是编写一个全局的异常处理器，其中分别处理ajax请求和页面请求的异常，ajax请求则返回错误信息，页面请求则跳转到500.jsp

1.1实现HandlerExceptionResolver接口

public class GlobalHandlerExceptionResolver implements HandlerExceptionResolver {

private static final Logger logger = LoggerFactory.getLogger(GlobalHandlerExceptionResolver.class);

@Override
public ModelAndView resolveException(HttpServletRequest req, HttpServletResponse resp, Object o, Exception ex) {
boolean isAsync = req.getHeader("X-Requested-With") != null && "XMLHttpRequest".equals(req.getHeader("X-Requested-With").toString());

if(isAsync) {
//WebTransException是自定义异常
if (ex instanceof WebTransException) {
WebTransException webTransException = (WebTransException) ex;
printWrite(webTransException.getResponseMsg(), resp);
logger.warn("ajax warn - [{}]", webTransException.getResponseCode()+":"+webTransException.getResponseMsg());
}else {
ex.printStackTrace();
printWrite("系统异常！", resp);
}

return new ModelAndView();
}

ModelAndView modelAndView = new ModelAndView();
modelAndView.setViewName("error/500");

if(ex instanceof WebTransException)
modelAndView.addObject("WebTransException", ex);
else
ex.printStackTrace();

return modelAndView;
}

public void printWrite(String msg, HttpServletResponse response) {
try {
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html; charset=UTF-8");

PrintWriter pw = response.getWriter();
pw.write(msg);
pw.flush();
pw.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}

1.2页面ajax弹出错误信息

function deleteUser() {
alert(${result["id"]});

$.ajax({
timeout : 20000,
type : "POST",
dataType : "json",
url : url,
data : data,
success : function(data) {
alert(data);
},
error : function(data) {
//         data.responseText就是后台返回的错误信息
alert(data.responseText);
}
});
}

1.3把处理器加到配置文件

<bean id="globalHandlerExceptionResolver" class="com.yitop.admin.ctrl.GlobalHandlerExceptionResolver"/>