Spring MVC 全局异常处理-RESTAPI接口返回统一JSON格式-自定义异常处理--404异常捕捉

需求

404错误

实现方式

原因和源码分析

404异常捕捉不能实现分析

原因和源码分析

<!-- 出现异常会跳到这个页面，总错误处理-->
<bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
<property name="defaultErrorView">
<value>/error/error</value>
</property>
<property name="defaultStatusCode">
<value>500</value>
</property>
<property name="warnLogCategory">
<value>org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver</value>
</property>
<!-- 如果不设置exceptionMappings,就会全局异常捕获 -->
<property name="exceptionMappings">
<props>
<prop key="Java.sql.SQLException">/error/error</prop>
<prop key="Java.lang.RuntimeException">/error/error</prop>
<prop key="org.springframework.web.multipart.MaxUploadSizeExceededException">/error/error</prop>
</props>
</property>
</bean>

@Component
public class MyExceptionHandler implements HandlerExceptionResolver {
public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
Map<String, Object> model = new HashMap<String, Object>();
model.put("ex", ex);

// 根据不同错误转向不同页面
if(ex instanceof BusinessException) {
return new ModelAndView("error-business", model);
}else if(ex instanceof ParameterException) {
return new ModelAndView("error-parameter", model);
} else {
return new ModelAndView("error", model);
}
}
}

//有一种说法，如果不起作用，id写成这样说不定能解决问题，因为加载的时候是按照这个id去加载的
< bean id="handlerExceptionResolver" class="cn.basttg.core.exception.MyExceptionHandler"/>

@ControllerAdvice
public class ExceptionHandler {

@ResponseBody
@org.springframework.web.bind.annotation.ExceptionHandler(Exception.class//这里可以选择其他具体的异常)
public ResponseModel handleUnexpectedServerError(Exception ex) {
ex.printStackTrace();

// 处理异常
ResponseModel response = new ResponseModel();

String errorMsg = ex.getMessage();
response.setCode(Integer.valueOf(ResultCode.SYSTEM_EXCEPTION));
if(errorMsg.contains("excpStart")){
errorMsg = errorMsg.substring(errorMsg.indexOf("excpStart") + 9, errorMsg.indexOf("excpEnd"));
}
response.setMessage(errorMsg);

// 返回数据
return response;
}

@ControllerAdvice
public class GlobalExceptionResolver extends DefaultHandlerExceptionResolver {

@ExceptionHandler(value = Exception.class)
public ModelAndView defaultErrorHandler(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
String url = request.getServletPath();
if (url.startsWith("/api")) {//api返回异常拦截

if (ex instanceof HttpRequestMethodNotSupportedException) {
setResponseParam(response, 405, "请求方式错误！");
return null;
}

if (ex instanceof MissingServletRequestParameterException) {
setResponseParam(response, 400, "错误请求！");
return null;
}

if (ex instanceof NoHandlerFoundException) {
//可以进行其他方法处理，LOG或者什么详细记录，我这里直接返回JSON
setResponseParam(response, 404, "请求路径错误！");
return null;
}

setResponseParam(response, 500, "服务器内部错误！服务暂时不可用！");
return null;
}

//这里调用父类的异常处理方法，实现其他不需要的异常交给SpringMVC处理
return super.doResolveException(request, response, handler, ex);

}

private void setResponseParam(HttpServletResponse response, int code, String msg) throws IOException {
JSONObject j = JSONObject.fromObject(R.error(code, msg));
response.setContentType("application/json");
response.setCharacterEncoding("utf-8");
response.getWriter().print(j.toString());
}
}

参考：

最终总结