Question

我必须在java中使用RESTFUL Spring API下载一些文件。我已经编写了API，如果我直接在浏览器上使用它，它可以正常工作。

@RequestMapping(value = "/download/{tagCategory}/{query}", method = RequestMethod.GET)
public ResponseEntity<InputStreamResource> getResourceFile(@PathVariable String tagCategory, @PathVariable String query) throws IOException
{
    File file = new File(FILE_PATH + tagCategory + "/" + query + ".txt");

    if (file.exists())
        System.out.println(file.toString() + " exists");
    else
        System.out.println(file.toString() + "not exists");

    InputStreamResource resource = new InputStreamResource(new FileInputStream(file));
    return ResponseEntity.ok().header(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=" + file.getName()).contentType(MediaType.APPLICATION_OCTET_STREAM).contentLength(file.length())
            .body(resource);
}

现在，我想创建一个包装器（我将在我的不同项目中使用），它将调用此API并获取下载的文件。包装器就像

@Override
public InputStreamResource getResourceFile(String tagCategory, String query) throws Exception
{
    Map<String, Object> requestBody = new HashMap<String, Object>();
    System.out.println("sdsdS12");
    HttpEntity<Map<String, Object>> httpEntity = new HttpEntity<Map<String, Object>>(requestBody);
    @SuppressWarnings("unchecked")
    CustomResponse<InputStreamResource> response = (CustomResponse<InputStreamResource>) performRestCall(
            "http://localhost:8080/SpringRestfulWebServicesExample/download/" + tagCategory + "/" + query, HttpMethod.GET, httpEntity,
            new ParameterizedTypeReference<CustomResponse<InputStreamResource>>()
            {});
    InputStreamResource isr = response.getPayload();
    File file = new File("C:/arpittandon.txt");
    FileUtils.copyInputStreamToFile(isr.getInputStream(), file);
    if (response.isSuccess())
        return response.getPayload();
    else
        throw new Exception(response.getMessage());
}

其中CustomResponse是

public class CustomResponse<T>
{
private boolean success = true;
private String  message = "";
private T       payload;

public boolean isSuccess()
{
    return success;
}

public void setSuccess(boolean success)
{
    this.success = success;
}

public String getMessage()
{
    return message;
}

public void setMessage(String message)
{
    this.message = message;
}

public T getPayload()
{
    return payload;
}

public void setPayload(T payload)
{
    this.payload = payload;
}

}

并且performRESTCall是

@SuppressWarnings({ "rawtypes" })
protected Object performRestCall(String url, HttpMethod httpMethod, HttpEntity body, ParameterizedTypeReference ptr)
{
    return performRestCall(url, httpMethod, body, ptr, HTTP_TIMEOUT);
}

@SuppressWarnings({ "rawtypes", "unchecked" })
protected Object performRestCall(String url, HttpMethod httpMethod, HttpEntity body, ParameterizedTypeReference ptr, int timeout)
{

    // System.out.println(url);
    // System.out.println(body.toString());
    SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
    factory.setReadTimeout(HTTP_TIMEOUT);
    factory.setConnectTimeout(timeout);

    RestTemplate restTemplate = new RestTemplate(factory);
    MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
    mappingJackson2HttpMessageConverter.setSupportedMediaTypes(Arrays.asList(MediaType.APPLICATION_JSON, MediaType.APPLICATION_OCTET_STREAM));
    restTemplate.getMessageConverters().add(mappingJackson2HttpMessageConverter);

    return restTemplate.exchange(url, httpMethod, body, ptr).getBody();
}

当我这样称呼时，我收到以下错误

org.springframework.http.converter.HttpMessageNotReadableException：无法读取JSON：无法识别的令牌＆＃39; mesh_mh＆＃39;：期待（＆＃39; true＆＃39;，＆＃39; false＆＃39;或＆＃39;空＆＃39）

我在java中并不是很好，并且使用上面的代码作为现有代码中的模板。

我只需要在我的不同项目中使用api下载文件。我怎么能这样做

使用java中的RESTFUL Spring API下载文件

0 个答案: