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

Question

我无法使用 HttpEntity 为 POST 请求调用 Spring RestTemplate。 我对 RestTemplate 的调用在 Postman 中给出了 Base64 字符串，但使用我的 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，但没有奏效 here

和this 我也提到了this

Answer 1

您可以使用 HttpMessageConverter 请求您对 HttpEntity 的 restTemplate 调用。 它可以从 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 text/plain 的 Content-Type 进行写入。

您可以通过如下实现 StringHttpMessageConverter 来尝试：

            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);

然后根据您的请求调用 restTemplate。

Answer 2

请尝试以下代码可能对您有所帮助：

 final HttpHeaders headers = new HttpHeaders();
            headers.setContentType(MediaType.APPLICATION_XML);
    HttpEntity requestEntity;
    if (entity instanceof String) {
        requestEntity = new HttpEntity(headers);
    } else {
        requestEntity = new HttpEntity(searchRequestInput, headers);
    }
       try {
        String response  =  restTemplate.exchange(baseURL, HttpMethod.POST, requestEntity, String.class).getBody().toString());
       } catch (HttpServerErrorException | HttpClientErrorException e) {
        e.printStackTrace();
       }

Answer 3

试试这些实用方法：

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;
}

这两种方法在哪里

• 实体：您的输入对象
• restUrl：你的网址
• HttpMethod：POST/GET
• entityClass：来自服务器的预期输出对象