Java HttpHeaders.isEmpty方法代码示例

import org.springframework.http.HttpHeaders; //导入方法依赖的package包/类
@Override
public StartingInfo startApplication(String appName) {
    CloudApplication app = getApplication(appName);
    if (app.getState() != CloudApplication.AppState.STARTED) {
        HashMap<String, Object> appRequest = new HashMap<String, Object>();
        appRequest.put("state", CloudApplication.AppState.STARTED);

        HttpEntity<Object> requestEntity = new HttpEntity<Object>(appRequest);
        ResponseEntity<String> entity = getRestTemplate().exchange(getUrl("/v2/apps/{guid}?stage_async=true"), HttpMethod.PUT,
            requestEntity, String.class, app.getMeta().getGuid());

        HttpHeaders headers = entity.getHeaders();

        // Return a starting info, even with a null staging log value, as a non-null starting info
        // indicates that the response entity did have headers. The API contract is to return starting info
        // if there are headers in the response, null otherwise.
        if (headers != null && !headers.isEmpty()) {
            String stagingFile = headers.getFirst("x-app-staging-log");

            if (stagingFile != null) {
                try {
                    stagingFile = URLDecoder.decode(stagingFile, "UTF-8");
                } catch (UnsupportedEncodingException e) {
                    logger.error("unexpected inability to UTF-8 decode", e);
                }
            }
            // Return the starting info even if decoding failed or staging file is null
            return new StartingInfo(stagingFile);
        }
    }
    return null;
}
 

import org.springframework.http.HttpHeaders; //导入方法依赖的package包/类
@SuppressWarnings("unchecked")
private void writePart(String name, HttpEntity<?> partEntity, OutputStream os) throws IOException {
    Object partBody = partEntity.getBody();
    Class<?> partType = partBody.getClass();
    HttpHeaders partHeaders = partEntity.getHeaders();
    MediaType partContentType = partHeaders.getContentType();
    for (HttpMessageConverter<?> messageConverter : this.partConverters) {
        if (messageConverter.canWrite(partType, partContentType)) {
            HttpOutputMessage multipartMessage = new MultipartMixedConverter.MultipartHttpOutputMessage(os);
            multipartMessage.getHeaders().setContentDispositionFormData(name, null);
            if (!partHeaders.isEmpty()) {
                multipartMessage.getHeaders().putAll(partHeaders);
            }
            ((HttpMessageConverter<Object>) messageConverter).write(partBody, partContentType, multipartMessage);
            return;
        }
    }
    throw new HttpMessageNotWritableException(
        "Could not write request: no suitable HttpMessageConverter found for request type [" + partType.getName()
            + "]");
}
 

import org.springframework.http.HttpHeaders; //导入方法依赖的package包/类
@SuppressWarnings("unchecked")
private void writePart(String name, HttpEntity<?> partEntity, OutputStream os) throws IOException {
	Object partBody = partEntity.getBody();
	Class<?> partType = partBody.getClass();
	HttpHeaders partHeaders = partEntity.getHeaders();
	MediaType partContentType = partHeaders.getContentType();
	for (HttpMessageConverter<?> messageConverter : partConverters) {
		if (messageConverter.canWrite(partType, partContentType)) {
			HttpOutputMessage multipartOutputMessage = new MultipartHttpOutputMessage(os);
			multipartOutputMessage.getHeaders().setContentDispositionFormData(name, getFilename(partBody));
			if (!partHeaders.isEmpty()) {
				multipartOutputMessage.getHeaders().putAll(partHeaders);
			}
			((HttpMessageConverter<Object>) messageConverter).write(partBody, partContentType, multipartOutputMessage);
			return;
		}
	}
	throw new HttpMessageNotWritableException(
			"Could not write request: no suitable HttpMessageConverter found for request type [" +
					partType.getName() + "]");
}
 

import org.springframework.http.HttpHeaders; //导入方法依赖的package包/类
public void handleHttpEntityResponse(HttpEntity<?> responseEntity, ServletWebRequest webRequest) throws Exception {
    if (responseEntity == null) {
        return;
    }

    HttpInputMessage inputMessage = createHttpInputMessage(webRequest);
    HttpOutputMessage outputMessage = createHttpOutputMessage(webRequest);
    if (responseEntity instanceof ResponseEntity && outputMessage instanceof ServerHttpResponse) {
        ((ServerHttpResponse) outputMessage).setStatusCode(((ResponseEntity<?>) responseEntity).getStatusCode());
    }

    HttpHeaders entityHeaders = responseEntity.getHeaders();
    if (!entityHeaders.isEmpty()) {
        outputMessage.getHeaders().putAll(entityHeaders);
    }

    Object body = responseEntity.getBody();
    if (body != null) {
        writeWithMessageConverters(body, inputMessage, outputMessage);
    }
    else {
        outputMessage.getBody();
    }
}