Spring REST 返回 PDF - 响应状态 406（不可接受）

Question

我在 SO 上阅读了许多关于此类问题的问题，但所有这些问题都建议使用正确的 Jackson 版本。 这是我目前的情况：

REST API：

@RequestMapping(value = "get/pdf/{id}", headers="Accept=*/*", method = RequestMethod.GET, produces = "application/pdf")
    @Override
    public ResponseEntity<InputStream> getPdfContractById(@PathVariable("id") Long id);

使用Accept:*/*在映射请求时产生错误（发生 404）

从我的pom：

    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>2.4.1</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.4.1.1</version>
    </dependency>

我也尝试添加这两个依赖项，但没有任何变化：

    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-core-asl</artifactId>
        <version>1.9.13</version>
    </dependency>
    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-mapper-asl</artifactId>
        <version>1.9.13</version>
    </dependency>

响应客户端： There was an unexpected error (type=Not Acceptable, status=406). 标题包括：

    Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Encoding:gzip, deflate, sdch

它出什么问题了？

---

更多细节

我正在使用此代码返回远程 PDF 文件：

 URL url = null; try { url = new URL(urlStr); } catch (MalformedURLException e) { e.printStackTrace(); throw new MyException(e.getMessage()); } InputStream pdfFile = null; try { pdfFile = url.openStream(); } catch (IOException e) { e.printStackTrace(); throw new MyException(e.getMessage()); } ResponseEntity<InputStream> re = ResponseEntity .ok() // .headers(headers) // .contentLength(contentLength) .contentType( MediaType.parseMediaType("application/pdf")) .body(pdfFile); return re;

Answer 1

基本上不需要在 RequestMapping 中添加 products produces = "application/pdf"因为它似乎试图在内部转换 ResponeBody。 您可以将MediaType添加到您需要的响应标头中。

@ResponseBody
@RequestMapping(value = "get/pdf/{id}", headers="Accept=*/*", method = RequestMethod.GET)
public ResponseEntity<InputStreamResource> getPdfContractById(@PathVariable("id") Long id){
        // Get the remove file based on the fileaddress
        RemoteFile remotefile = new RemoteFile(id);

        // Set the input stream
        InputStream inputstream = remotefile.getInputStream();
        // asume that it was a PDF file
        HttpHeaders responseHeaders = new HttpHeaders();
        InputStreamResource inputStreamResource = new InputStreamResource(inputStream);
        responseHeaders.setContentLength(contentLengthOfStream);
        responseHeaders.setContentType(MediaType.valueOf("application/pdf"));
        // just in case you need to support browsers
        responseHeaders.put("Content-Disposition", Collections.singletonList("attachment; filename=somefile.pdf"))
        return new ResponseEntity<InputStreamResource> (inputStreamResource,
                                   responseHeaders,
                                   HttpStatus.OK);
}