java - 所请求的资源上存在“Access-Control-Allow-Origin” header 导致的 Spring 文件上传失败

文件上传API因angularjs发布调用而失败。以下是文件上传API代码，
FileUploadController.java

@RestController
@RequestMapping(value="/v1")
public class FileUploadController {

    @Autowired
    private ServletContext context;

    @RequestMapping(value = "/fileUpload", headers = "content-type=multipart/*", method = RequestMethod.POST)
    public ResponseEntity<FileInfo> upload(@RequestParam("file") MultipartFile inputFile){
        FileInfo fileInfo = new FileInfo();
        HttpHeaders headers = new HttpHeaders();

        if(!inputFile.isEmpty()){
            try {
                String originalFileName = inputFile.getOriginalFilename();
                File destinationFile = new File(context.getRealPath("/WEB-INF/images") + File.separator + originalFileName);
                inputFile.transferTo(destinationFile);
                fileInfo.setFileName(destinationFile.getPath());
                fileInfo.setFileSize(inputFile.getSize());
                headers.add("FileUploaded Successfully - ", originalFileName);

                return new ResponseEntity<FileInfo>(fileInfo, headers, HttpStatus.OK);
            } catch (Exception e) {
                return new ResponseEntity<FileInfo>(HttpStatus.BAD_REQUEST);
            }
        }
        return new ResponseEntity<FileInfo>(HttpStatus.BAD_REQUEST);
    }
}

SimpleCorsFilter.java

    import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;

public class SimpleCorsFilter implements Filter {

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
            throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) res;
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "x-requested-with, X-Auth-Token, Content-Type");
        response.setHeader("Access-Control-Allow-Credentials","false");
        chain.doFilter(req, res);
    }
}

堆栈跟踪：

SEVERE [http-nio-8080-exec-9] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [appServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.web.multipart.MultipartException: Could not parse multipart servlet request; nested exception is org.apache.commons.fileupload.FileUploadException: the request was rejected because no multipart boundary was found] with root cause

Angularjs测试代码：

myApp.service('fileUpload', ['$http', function ($http) {
    this.uploadFileToUrl = function(file, uploadUrl){
        var fd = new FormData();
        fd.append('file', file);
        $http.post(uploadUrl, fd, {
            transformRequest: angular.identity,
            headers: {'Content-Type': undefined}
        })
        .success(function(){
        })
        .error(function(){
        });
    }
}]);

myApp.controller('myCtrl', ['$scope', 'fileUpload', function($scope, fileUpload){

    $scope.uploadFile = function(){
        var file = $scope.myFile;
        console.log('file is ' );
        console.dir(file);
        var uploadUrl = "http://xxx/v1/fileUpload";
        //var uploadUrl = "http://localhost:8080/xxx/v1/fileUpload";
        fileUpload.uploadFileToUrl(file, uploadUrl);
    };

}]);

问题：
 所请求的资源上没有“ Access-Control-Allow-Origin”标头。因此，不允许访问源'http://localhost'。响应的HTTP状态码为500。

请帮助我纠正此问题

最佳答案

在控制器方法上使用@CrossOrigin

查看示例：https://spring.io/guides/gs/rest-service-cors/

@CrossOrigin(origins = "*")
@RequestMapping(value = "/fileUpload", headers = "content-type=multipart/*", method = RequestMethod.POST)
public ResponseEntity<FileInfo> upload(@RequestParam("file") MultipartFile inputFile){

关于java - 所请求的资源上存在“Access-Control-Allow-Origin” header 导致的 Spring 文件上传失败，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/45524570/