尝试在 Spring Boot REST API 中下载文件时如何修复“找不到资源”？

Question

I'm new to spring framework and REST, and now trying to migrate REST from jersey to spring boot 2.1 The controller works fine with jax-rs, however, I don't want to use jax-rs in spring boot. So, I tried spring Mvc and I get 'resource not found' error. Please I'd really appreciate any help.

I tried this

@GetMapping(value ="/generic/download_file/{path:[^\\.+]*}", consumes ="application/vnd.X-FileContent")
    public ResponseEntity<?> downloadFile(@PathVariable("path") String filePath){

        String actualFilePath = "";

        try {

            actualFilePath = filePath.replaceAll("\\/", "\\\\");

            File file = new File(actualFilePath);

            if (file.exists()) {

                return ResponseEntity.ok().header("Content-Disposition", "attachment; filename=\"" + file.getName() + "\"").body(file);

            } else {

                return errorHandling.errorResponseFactory("1.0.0", Thread.currentThread().getStackTrace()[1], "",
                        RecommendedSolution.UseValidDirectoryPath, "File not exist.");

            }

        } catch (Exception ex) {

            ActionLog.writeLog("program_library_v510", "1.0.0", "Exception occur during gettig generic package file",
                    ActionLogType.DebugLog);
            ActionLog.writeLog("program_library_v510", "1.0.0", "Exception occur during getting generic package file",
                    ActionLogType.ErrorLog);

            return errorHandling.errorResponseFactory("1.0.0", Thread.currentThread().getStackTrace()[1], "",
                    RecommendedSolution.UnexpectedErrorMsg, "");
        }
    }

2019-01-07 17:17:23.930 INFO 13664 --- [nio-9090-exec-2] osweb.servlet.DispatcherServlet : Completed initialization in 10 ms 2019-01-07 17:17:23.947 DEBUG 13664 --- [nio-9090-exec-2] osweb.servlet.DispatcherServlet : GET "/packages/download_file/D:/xfolder/test.txt", paramete rs={} 2019-01-07 17:17:24.002 DEBUG 13664 --- [nio-9090-exec-2] oswshandler.SimpleUrlHandlerMapping : Mapped to ResourceHttpRequestHandler ["classpath:/META-INF/ resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/", "/"] 2019-01-07 17:17:24.006 DEBUG 13664 --- [nio-9090-exec-2] oswsrResourceHttpRequestHandler : Resource not found 2019-01-07 17:17:24.007 DEBUG 13664 --- [nio-9090-exec-2] osweb.servlet.DispatcherServlet : Completed 404 NOT_FOUND 2019-01-07 17:17:24.015 DEBUG 13664 --- [nio-9090-exec-2] osweb.servlet.DispatcherServlet : "ERROR" dispatch for GET "/error", parameters={} 2019-01-07 17:17:24.029 DEBUG 13664 --- [nio-9090-exec-2] swsmmaRequestMappingHandlerMapping : Mapped to p ublic org.springframework.http.ResponseEntity> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServ letRequest) 2019-01-07 17:17:24.077 DEBUG 13664 --- [nio-9090-exec-2] oswsmmaHttpEntityMethodProcessor : Using 'application/json', given [ / ] and supported [applic ation/json, application/ +json, application/json, application/ +json] 2019-01-07 17:17:24.078 DEBUG 13664 --- [nio-9090-exec-2] oswsmmaHttpEntityMethodProcessor : Writing [{timestamp=Mon Jan 07 17:17:24 SGT 2019, status=40 4, error=Not Found, message=No message available, path=/packages/download_file/D:/xfolder/test.txt}] 2019-01-07 17:17:24.146 DEBUG 13664 --- [nio-9090-exec-2] osweb.servlet.DispatcherServlet : Exiting from "ERROR" dispatch, status 404

Answer 1

I suspect two things here. Let me clarify this.

1. What is the API url you are calling? /generic/download_file/{path:[^\\\\.+]*} or /packages/download_file/D:/xfolder/test.txt

both are looks different. Please see generic and packages

2. The better way to pass filenames in URL is using @RequestParam instead of @PathVariable

   @GetMapping(value ="/generic/download_file/", consumes ="application/vnd.X-FileContent") public ResponseEntity downloadFile(@RequestParam("path") String filePath){