如何使用Apache HttpClient发布JSON请求？ [英] How to POST JSON request using Apache HttpClient?

问题描述

我有以下内容：

  final String url =http://example.com; 
 
 final HttpClient httpClient = new HttpClient（）; 
 final PostMethod postMethod = new PostMethod（url）; 
 postMethod.addRequestHeader（Content-Type，application / json）; 
 postMethod.addParameters（new NameValuePair [] {
 new NameValuePair（name，value）
}）; 
 httpClient.executeMethod（httpMethod）; 
 postMethod .getResponseBodyAsStream（）; 
 postMethod.releaseConnection（）; 
  

它不断回来500.服务提供商说我需要发送JSON。如何使用Apache HttpClient 3.1 +？

解决方案

Apache HttpClient不会我对JSON一无所知，所以你需要单独构建你的JSON。为此，我建议你查看简单的 json.org 的noreferrer> JSON-java 库。（如果JSON-java没有不适合你，json.org有很多不同语言的库。）

一旦你生成了你的JSON，就可以使用代码之类的东西了。在下面发布它

  StringReques tEntity requestEntity = new StringRequestEntity（
 JSON_STRING，
application / json，
UTF-8）; 
 
 PostMethod postMethod = new PostMethod（http://example.com/action）; 
 postMethod.setRequestEntity（requestEntity）; 
 
 int statusCode = httpClient.executeMethod（postMethod）; 
  

修改

<注意 - 上述答案，如问题中所要求的，适用于Apache HttpClient 3.1。但是，为了帮助任何人寻找针对最新Apache客户端的实现：

  StringEntity requestEntity = new StringEntity（
 JSON_STRING） ，
 ContentType.APPLICATION_JSON）; 
 
 HttpPost postMethod = new HttpPost（http://example.com/action）; 
 postMethod.setEntity（requestEntity）; 
 
 HttpResponse rawResponse = httpclient.execute（postMethod）; 
  

I have something like the following:

final String url = "http://example.com";

final HttpClient httpClient = new HttpClient();
final PostMethod postMethod = new PostMethod(url);
postMethod.addRequestHeader("Content-Type", "application/json");
postMethod.addParameters(new NameValuePair[]{
        new NameValuePair("name", "value)
});
httpClient.executeMethod(httpMethod);
postMethod.getResponseBodyAsStream();
postMethod.releaseConnection();

It keeps coming back with a 500. The service provider says I need to send JSON. How is that done with Apache HttpClient 3.1+?

解决方案

Apache HttpClient doesn't know anything about JSON, so you'll need to construct your JSON separately. To do so, I recommend checking out the simple JSON-java library from json.org. (If "JSON-java" doesn't suit you, json.org has a big list of libraries available in different languages.)

Once you've generated your JSON, you can use something like the code below to POST it

StringRequestEntity requestEntity = new StringRequestEntity(
    JSON_STRING,
    "application/json",
    "UTF-8");

PostMethod postMethod = new PostMethod("http://example.com/action");
postMethod.setRequestEntity(requestEntity);

int statusCode = httpClient.executeMethod(postMethod);

Edit

Note - The above answer, as asked for in the question, applies to Apache HttpClient 3.1. However, to help anyone looking for an implementation against the latest Apache client:

StringEntity requestEntity = new StringEntity(
    JSON_STRING,
    ContentType.APPLICATION_JSON);

HttpPost postMethod = new HttpPost("http://example.com/action");
postMethod.setEntity(requestEntity);

HttpResponse rawResponse = httpclient.execute(postMethod);

这篇关于如何使用Apache HttpClient发布JSON请求？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！