Java 从Apache HttpClient中的HttpResponse对象获取JSON属性

我正在使用ApacheHttpClient 4.2，只需要从下面的JSON响应中获取

title

属性

我需要为此使用EntityUtils.toString（）方法吗

代码

DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost postRequest = new HttpPost(MAILCHIMP_API_URL);

postRequest.setHeader("Content-Type", "application/json");
postRequest.setHeader("Authorization", "Basic " + MAILCHIMP_API_KEY_BASE64);

StringEntity entity = new StringEntity(json.toString(), "UTF8");
postRequest.setEntity(entity);

HttpResponse response = httpClient.execute(postRequest);

// Closes the connection
EntityUtils.consume(response.getEntity());

{
  "type": "http://developer.mailchimp.com/documentation/mailchimp/guides/error-glossary/",
  "title": "Member Exists",
  "status": 400,
  "detail": "user@domain.com is already a list member. Use PUT to insert or update list members.",
  "instance": ""
}

JSON响应

DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost postRequest = new HttpPost(MAILCHIMP_API_URL);

postRequest.setHeader("Content-Type", "application/json");
postRequest.setHeader("Authorization", "Basic " + MAILCHIMP_API_KEY_BASE64);

StringEntity entity = new StringEntity(json.toString(), "UTF8");
postRequest.setEntity(entity);

HttpResponse response = httpClient.execute(postRequest);

// Closes the connection
EntityUtils.consume(response.getEntity());

{
  "type": "http://developer.mailchimp.com/documentation/mailchimp/guides/error-glossary/",
  "title": "Member Exists",
  "status": 400,
  "detail": "user@domain.com is already a list member. Use PUT to insert or update list members.",
  "instance": ""
}

试试这个（jackson2库）：

---

您可以使用基于ApacheHTTPAPI构建的http请求。文件

private静态最终HttpRequest HTTP\u请求=
HttpRequestBuilder.createPost（MAILCHIMP_API_URL，新类型引用（）{
})
.addContentType（ContentType.APPLICATION_JSON）
.addDefaultHeader（“授权”、“基本”+MAILCHIMP\u API\u密钥\u BASE64）
.build（）；
公开作废法（）{
字符串title=HTTP_REQUEST.executeWithBody（json.toString（））.get（）.get（“title”）；
}

可能会有帮助。

private static final HttpRequest<Map<String, Object>> HTTP_REQUEST =
    HttpRequestBuilder.createPost(MAILCHIMP_API_URL, new TypeReference<Map<String, Object>>() {
    })
    .addContentType(ContentType.APPLICATION_JSON)
    .addDefaultHeader("Authorization", "Basic " + MAILCHIMP_API_KEY_BASE64)
    .build();
public void method() {
    String title = HTTP_REQUEST.executeWithBody(json.toString()).get().get("title");
}