我用maven編寫(xiě)了教程https://spring.io/guides/gs/uploading-files/復(fù)制了我使用的所有代碼。該應(yīng)用程序可以運(yùn)行，但是出現(xiàn)錯(cuò)誤：Whitelabel Error Page此應(yīng)用程序沒(méi)有針對(duì)/ error的顯式映射，因此您將其視為后備。Tue Jun 30 17:24:02 CST 2015有一個(gè)意外錯(cuò)誤（類(lèi)型=未找到，狀態(tài)= 404）。無(wú)訊息我該如何解決？
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您可以通過(guò)ErrorController在應(yīng)用程序中添加來(lái)解決此問(wèn)題。您可以讓錯(cuò)誤控制器返回所需的視圖。
我的應(yīng)用程序中的錯(cuò)誤控制器如下所示：
import org.springframework.boot.autoconfigure.web.ErrorAttributes;
import org.springframework.boot.autoconfigure.web.ErrorController;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.ServletRequestAttributes;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import java.util.Map;
/**
* Basic Controller which is called for unhandled errors
*/
@Controller
public class AppErrorController implements ErrorController{
/**
* Error Attributes in the Application
*/
private ErrorAttributes errorAttributes;
private final static String ERROR_PATH = "/error";
/**
* Controller for the Error Controller
* @param errorAttributes
*/
public AppErrorController(ErrorAttributes errorAttributes) {
this.errorAttributes = errorAttributes;
}
/**
* Supports the HTML Error View
* @param request
* @return
*/
@RequestMapping(value = ERROR_PATH, produces = "text/html")
public ModelAndView errorHtml(HttpServletRequest request) {
return new ModelAndView("/errors/error", getErrorAttributes(request, false));
}
/**
* Supports other formats like JSON, XML
* @param request
* @return
*/
@RequestMapping(value = ERROR_PATH)
@ResponseBody
public ResponseEntity<Map<String, Object>> error(HttpServletRequest request) {
Map<String, Object> body = getErrorAttributes(request, getTraceParameter(request));
HttpStatus status = getStatus(request);
return new ResponseEntity<Map<String, Object>>(body, status);
}
/**
* Returns the path of the error page.
*
* @return the error path
*/
@Override
public String getErrorPath() {
return ERROR_PATH;
}
private boolean getTraceParameter(HttpServletRequest request) {
String parameter = request.getParameter("trace");
if (parameter == null) {
return false;
}
return !"false".equals(parameter.toLowerCase());
}
private Map<String, Object> getErrorAttributes(HttpServletRequest request,
boolean includeStackTrace) {
RequestAttributes requestAttributes = new ServletRequestAttributes(request);
return this.errorAttributes.getErrorAttributes(requestAttributes,
includeStackTrace);
}
private HttpStatus getStatus(HttpServletRequest request) {
Integer statusCode = (Integer) request
.getAttribute("javax.servlet.error.status_code");
if (statusCode != null) {
try {
return HttpStatus.valueOf(statusCode);
}
catch (Exception ex) {
}
}
return HttpStatus.INTERNAL_SERVER_ERROR;
}
}
上面的類(lèi)基于Springs BasicErrorController類(lèi)。
您可以ErrorController在@Configuration文件中實(shí)例化以上內(nèi)容：
@Autowired
private ErrorAttributes errorAttributes;
@Bean
public AppErrorController appErrorController(){return new AppErrorController(errorAttributes);}
您可以ErrorAttributes通過(guò)實(shí)現(xiàn)ErrorAttributes選擇覆蓋默認(rèn)值。但在大多數(shù)情況下，DefaultErrorAttributes應(yīng)該足夠。
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