Question

我无法通过HttpEntity调用Spring RestTemplate进行POST请求。我对RestTemplate的调用在Postman中给出了Base64字符串，但是使用我的java实现，它给出了以下错误：

java.lang.IllegalArgumentException: Illegal base64 character 5b
at java.util.Base64$Decoder.decode0(Base64.java:714)
at java.util.Base64$Decoder.decode(Base64.java:526)
at java.util.Base64$Decoder.decode(Base64.java:549)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

我的实现是：

final HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_XML);
            final HttpEntity<String> request = new HttpEntity<String>(searchRequestInput, headers);

            final ResponseEntity<String> postForEntity = restTemplate
                    .postForEntity(baseURL, request, String.class);

            String response = postForEntity.getBody();

我尝试了以下解决方案，但是没有用 here

和this 我也提到了this

Answer 1

您可以使用HttpMessageConverter请求对HttpEntity的restTemplate调用。可以从HTTP请求和响应中读取和写入字符串。

来自doc：默认情况下，此转换器支持所有文本媒体类型（text / *），并使用Content / Type为text / plain的内容进行写入。

您可以通过实现StringHttpMessageConverter来尝试以下操作：

            final HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_XML);
            final HttpEntity<String> request = new HttpEntity<String>(searchRequestInput, headers);
            List<HttpMessageConverter<?>> messageConverters = new ArrayList<HttpMessageConverter<?>>();
            messageConverters.add(new StringHttpMessageConverter());
            restTemplate.setMessageConverters(messageConverters);

然后使用您的请求调用restTemplate。

Answer 2

尝试以下实用方法：

public static <T> ResponseEntity<T> makeRestRequest(Object entity, String restUrl, HttpMethod method, Class<T> entityClass) {
    RestTemplate restTemplate = new RestTemplate();
    HttpEntity httpEntity = makeHttpEntity(entity);
    ResponseEntity<T> response = null;

    try {
        response = restTemplate.exchange(restUrl, method, httpEntity, entityClass);
    } catch (HttpClientErrorException e) {
        e.printStackTrace();
        return new ResponseEntity<>(e.getStatusCode());
    }

    return response;
}

public static <T> HttpEntity makeHttpEntity(T entity) {
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_XML);
    HttpEntity<T> httpEntity = new HttpEntity<>(entity, headers);
    return httpEntity;
}

这两种方法中的

实体：您的输入对象

restUrl：您的网址

HttpMethod：POST / GET

entityClass：服务器的预期输出对象

Answer 3

请尝试以下代码，可能对您有帮助：

override func collectionView(_ collectionView: QMChatCollectionView!, layoutModelAt indexPath: IndexPath!) -> QMChatCellLayoutModel {
        var layoutModel: QMChatCellLayoutModel = super.collectionView(collectionView, layoutModelAt: indexPath)

        layoutModel.avatarSize = CGSize(width: 0, height: 0)
        layoutModel.topLabelHeight = 0.0
        layoutModel.spaceBetweenTextViewAndBottomLabel = 5
        layoutModel.maxWidthMarginSpace = 20.0

        guard let item = self.chatDataSource.message(for: indexPath) else {
            return layoutModel
        }
        let viewClass: AnyClass = self.viewClass(forItem: item)! as AnyClass
        if viewClass === QMChatIncomingCell.self || viewClass === QMChatAttachmentIncomingCell.self //|| viewClass === QMVideoIncomingCell.self
        {
            if self.dialog.type != QBChatDialogType.private {
                let topAttributedString = self.topLabelAttributedString(forItem: item)
                let size = TTTAttributedLabel.sizeThatFitsAttributedString(topAttributedString, withConstraints: CGSize(width: collectionView.frame.width - kMessageContainerWidthPadding, height: CGFloat.greatestFiniteMagnitude), limitedToNumberOfLines:1)
                layoutModel.topLabelHeight = size.height
                 //layoutModel.topLabelHeight = 0
            }

            layoutModel.spaceBetweenTopLabelAndTextView = 5
        }

        var size = CGSize.zero

        if self.detailedCells.contains(item.id!) {

            let bottomAttributedString = self.bottomLabelAttributedString(forItem: item)
            size = TTTAttributedLabel.sizeThatFitsAttributedString(bottomAttributedString, withConstraints: CGSize(width: collectionView.frame.width - kMessageContainerWidthPadding, height: CGFloat.greatestFiniteMagnitude), limitedToNumberOfLines:0)
        }
        layoutModel.bottomLabelHeight = floor(size.height)
        return layoutModel
    }

Spring RestTemplate POST请求不适用于HttpEntity <string>

3 个答案: