blocks|key|584470|text|使用HttpURLConnection可能是最简单的。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|584471|http://www.xyzws.com/Javafaq/how-to-use-httpurlconnection-post-data-to-web-server/139|584472|您将使用JSONObject或其他工具来构造您的JSON，但不是用来处理网络的；您需要序列化它，然后将它传递给HttpURLConnection进行POST。|584473|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/7/docs/api/java/net/HttpURLConnection.html|1^0|2|H|0|0|0|2D|1|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|F|3|G|5|6|7|Y|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|Z|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|E]]]]

It's probably easiest to use <a href="http://docs.oracle.com/javase/7/docs/api/java/net/HttpURLConnection.html" rel="noreferrer">HttpURLConnection</a>.

<a href="http://www.xyzws.com/Javafaq/how-to-use-httpurlconnection-post-data-to-web-server/139" rel="noreferrer">http://www.xyzws.com/Javafaq/how-to-use-httpurlconnection-post-data-to-web-server/139</a>

You'll use JSONObject or whatever to construct your JSON, but not to handle the network; you need to serialize it and then pass it to an HttpURLConnection to POST.

blocks|key|584526|text|@momo针对4.3.1或更高版本的Apache+HttpClient的答案。我正在使用JSON-Java来构建我的JSON对象：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|584527|JSONObject+json+=+new+JSONObject();
json.put("someKey",+"someValue");++++

CloseableHttpClient+httpClient+=+HttpClientBuilder.create().build();

try+{
++++HttpPost+request+=+new+HttpPost("http://yoururl");
++++StringEntity+params+=+new+StringEntity(json.toString());
++++request.addHeader("content-type",+"application/json");
++++request.setEntity(params);
++++httpClient.execute(request);
//+handle+response+here...
}+catch+(Exception+ex)+{
++++//+handle+exception+here
}+finally+{
++++httpClient.close();
}|code-block|syntax|javascript|584528|entityMap^0|18|9|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

@momo's answer for Apache HttpClient, version 4.3.1 or later. I'm using <code>JSON-Java</code> to build my JSON object:

<pre><code>JSONObject json = new JSONObject();
json.put("someKey", "someValue"); 

CloseableHttpClient httpClient = HttpClientBuilder.create().build();

try {
 HttpPost request = new HttpPost("http://yoururl");
 StringEntity params = new StringEntity(json.toString());
 request.addHeader("content-type", "application/json");
 request.setEntity(params);
 httpClient.execute(request);
// handle response here...
} catch (Exception ex) {
 // handle exception here
} finally {
 httpClient.close();
}
</code></pre>

blocks|key|584568|text|您可以使用Gson库将java类转换为JSON对象。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|584569|按照上述示例，为要发送的变量创建一个pojo类|584570|{"name":"myname","age":"20"}|code-block|syntax|javascript|584571|变成了|584572|class+pojo1
{
+++String+name;
+++String+age;
+++//generate+setter+and+getters
}|584573|一旦在pojo1类中设置了变量，就可以使用以下代码发送|584574|String+++++++postUrl+++++++=+"www.site.com";//+put+in+your+url
Gson+++++++++gson++++++++++=+new+Gson();
HttpClient+++httpClient++++=+HttpClientBuilder.create().build();
HttpPost+++++post++++++++++=+new+HttpPost(postUrl);
StringEntity+postingString+=+new+StringEntity(gson.toJson(pojo1));//gson.tojson()+converts+your+pojo+to+json
post.setEntity(postingString);
post.setHeader("Content-type",+"application/json");
HttpResponse++response+=+httpClient.execute(post);|584575|这些是导入的|584576|import+org.apache.http.HttpEntity;
import+org.apache.http.HttpResponse;
import+org.apache.http.client.HttpClient;
import+org.apache.http.client.methods.HttpPost;
import+org.apache.http.entity.StringEntity;
import+org.apache.http.impl.client.HttpClientBuilder;|584577|而对于GSON|584578|import+com.google.gson.Gson;|584579|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|14|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|15|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|16|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|17|8|@]|9|@]|A|$]]|$1|S|3|T|5|F|7|18|8|@]|9|@]|A|$G|H]]|$1|U|3|V|5|6|7|19|8|@]|9|@]|A|$]]|$1|W|3|X|5|F|7|1A|8|@]|9|@]|A|$G|H]]|$1|Y|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Z|$]]

You can make use of Gson library to convert your java classes to JSON objects.

Create a pojo class for variables you want to send
as per above Example 

<pre><code>{"name":"myname","age":"20"}
</code></pre>

becomes

<pre><code>class pojo1
{
 String name;
 String age;
 //generate setter and getters
}
</code></pre>

once you set the variables in pojo1 class you can send that using the following code

<pre><code>String postUrl = "www.site.com";// put in your url
Gson gson = new Gson();
HttpClient httpClient = HttpClientBuilder.create().build();
HttpPost post = new HttpPost(postUrl);
StringEntity postingString = new StringEntity(gson.toJson(pojo1));//gson.tojson() converts your pojo to json
post.setEntity(postingString);
post.setHeader("Content-type", "application/json");
HttpResponse response = httpClient.execute(post);
</code></pre>

and these are the imports

<pre><code>import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;
</code></pre>

and for GSON

<pre><code>import com.google.gson.Gson;
</code></pre>

blocks|key|584588|text|尝试以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|584589|HttpClient+httpClient+=+new+DefaultHttpClient();

try+{
++++HttpPost+request+=+new+HttpPost("http://yoururl");
++++StringEntity+params+=new+StringEntity("details={\"name\":\"myname\",\"age\":\"20\"}+");
++++request.addHeader("content-type",+"application/json");
++++request.addHeader("Accept","application/json");
++++request.setEntity(params);
++++HttpResponse+response+=+httpClient.execute(request);

++++//+handle+response+here...
}catch+(Exception+ex)+{
++++//+handle+exception+here
}+finally+{
++++httpClient.getConnectionManager().shutdown();
}|code-block|syntax|javascript|584590|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this code:

<pre><code>HttpClient httpClient = new DefaultHttpClient();

try {
 HttpPost request = new HttpPost("http://yoururl");
 StringEntity params =new StringEntity("details={\"name\":\"myname\",\"age\":\"20\"} ");
 request.addHeader("content-type", "application/json");
 request.addHeader("Accept","application/json");
 request.setEntity(params);
 HttpResponse response = httpClient.execute(request);

 // handle response here...
}catch (Exception ex) {
 // handle exception here
} finally {
 httpClient.getConnectionManager().shutdown();
}
</code></pre>

blocks|key|584600|text|protected+void+sendJson(final+String+play,+final+String+prop)+{
+++++Thread+t+=+new+Thread()+{
+++++public+void+run()+{
++++++++Looper.prepare();+//For+Preparing+Message+Pool+for+the+childThread
++++++++HttpClient+client+=+new+DefaultHttpClient();
++++++++HttpConnectionParams.setConnectionTimeout(client.getParams(),+1000);+//Timeout+Limit
++++++++HttpResponse+response;
++++++++JSONObject+json+=+new+JSONObject();

++++++++++++try+{
++++++++++++++++HttpPost+post+=+new+HttpPost("http://192.168.0.44:80");
++++++++++++++++json.put("play",+play);
++++++++++++++++json.put("Properties",+prop);
++++++++++++++++StringEntity+se+=+new+StringEntity(json.toString());
++++++++++++++++se.setContentType(new+BasicHeader(HTTP.CONTENT_TYPE,+"application/json"));
++++++++++++++++post.setEntity(se);
++++++++++++++++response+=+client.execute(post);

++++++++++++++++/*Checking+response+*/
++++++++++++++++if+(response+!=+null)+{
++++++++++++++++++++InputStream+in+=+response.getEntity().getContent();+//Get+the+data+in+the+entity
++++++++++++++++}

++++++++++++}+catch+(Exception+e)+{
++++++++++++++++e.printStackTrace();
++++++++++++++++showMessage("Error",+"Cannot+Estabilish+Connection");
++++++++++++}

++++++++++++Looper.loop();+//Loop+in+the+message+queue
++++++++}
++++};
++++t.start();
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|584601|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>protected void sendJson(final String play, final String prop) {
 Thread t = new Thread() {
 public void run() {
 Looper.prepare(); //For Preparing Message Pool for the childThread
 HttpClient client = new DefaultHttpClient();
 HttpConnectionParams.setConnectionTimeout(client.getParams(), 1000); //Timeout Limit
 HttpResponse response;
 JSONObject json = new JSONObject();

 try {
 HttpPost post = new HttpPost("http://192.168.0.44:80");
 json.put("play", play);
 json.put("Properties", prop);
 StringEntity se = new StringEntity(json.toString());
 se.setContentType(new BasicHeader(HTTP.CONTENT_TYPE, "application/json"));
 post.setEntity(se);
 response = client.execute(post);

 /*Checking response */
 if (response != null) {
 InputStream in = response.getEntity().getContent(); //Get the data in the entity
 }

 } catch (Exception e) {
 e.printStackTrace();
 showMessage("Error", "Cannot Estabilish Connection");
 }

 Looper.loop(); //Loop in the message queue
 }
 };
 t.start();
}
</code></pre>

blocks|key|800627|text|我推荐基于apache+http+api构建的http-request。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|800628|HttpRequest<String>+httpRequest+=+HttpRequestBuilder.createPost(yourUri,+String.class)
++++.responseDeserializer(ResponseDeserializer.ignorableDeserializer()).build();

public+void+send(){
+++ResponseHandler<String>+responseHandler+=+httpRequest.execute("details",+yourJsonData);

+++int+statusCode+=+responseHandler.getStatusCode();
+++String+responseContent+=+responseHandler.orElse(null);+//+returns+Content+from+response.+If+content+isn't+present+returns+null.+
}|code-block|syntax|javascript|800629|如果您希望将JSON作为请求正文发送，您可以：|style|CODE|800630|++ResponseHandler<String>+responseHandler+=+httpRequest.executeWithBody(yourJsonData);|800631|我强烈建议在使用之前阅读文档。|800632|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/jsunsoftware/http-request^0|N|C|0|0|0|6|4|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|F|7|12|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|13|8|@$A|14|B|15|K|L]]|9|@]|C|$]]|$1|M|3|N|5|F|7|16|8|@]|9|@]|C|$G|H]]|$1|O|3|P|5|6|7|17|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

I recomend <a href="https://github.com/jsunsoftware/http-request" rel="nofollow noreferrer">http-request</a> built on apache http api.

<pre><code>HttpRequest&lt;String&gt; httpRequest = HttpRequestBuilder.createPost(yourUri, String.class)
 .responseDeserializer(ResponseDeserializer.ignorableDeserializer()).build();

public void send(){
 ResponseHandler&lt;String&gt; responseHandler = httpRequest.execute("details", yourJsonData);

 int statusCode = responseHandler.getStatusCode();
 String responseContent = responseHandler.orElse(null); // returns Content from response. If content isn't present returns null. 
}
</code></pre>

If you want send <code>JSON</code> as request body you can:

<pre><code> ResponseHandler&lt;String&gt; responseHandler = httpRequest.executeWithBody(yourJsonData);
</code></pre>

I higly recomend read documentation before use.

blocks|key|584677|text|您可以在Apache+HTTP中使用以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|584678|String+payload+=+"{\"name\":+\"myname\",+\"age\":+\"20\"}";
post.setEntity(new+StringEntity(payload,+ContentType.APPLICATION_JSON));

response+=+client.execute(request);|code-block|syntax|javascript|584679|此外，您还可以创建一个json对象，并将字段放入该对象，如下所示|584680|HttpPost+post+=+new+HttpPost(URL);
JSONObject+payload+=+new+JSONObject();
payload.put("name",+"myName");
payload.put("age",+"20");
post.setEntity(new+StringEntity(payload.toString(),+ContentType.APPLICATION_JSON));|584681|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You can use the following code with Apache HTTP:

<pre><code>String payload = "{\"name\": \"myname\", \"age\": \"20\"}";
post.setEntity(new StringEntity(payload, ContentType.APPLICATION_JSON));

response = client.execute(request);
</code></pre>

Additionally you can create a json object and put in fields into the object like this

<pre><code>HttpPost post = new HttpPost(URL);
JSONObject payload = new JSONObject();
payload.put("name", "myName");
payload.put("age", "20");
post.setEntity(new StringEntity(payload.toString(), ContentType.APPLICATION_JSON));
</code></pre>

blocks|key|800692|text|对于Java11，您可以使用新的HTTP+client|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|800693|HttpClient+client+=+HttpClient.newHttpClient();
HttpRequest+request+=+HttpRequest.newBuilder()
++++.uri(URI.create("http://localhost/api"))
++++.header("Content-Type",+"application/json")
++++.POST(ofInputStream(()+->+getClass().getResourceAsStream(
++++++++"/some-data.json")))
++++.build();

client.sendAsync(request,+BodyHandlers.ofString())
++++.thenApply(HttpResponse::body)
++++.thenAccept(System.out::println)
++++.join();|code-block|syntax|javascript|800694|您可以使用来自InputStream、String、File的发布器。可以使用JSON完成JSON到String或IS的转换。|style|CODE|800695|entityMap|0|LINK|mutability|MUTABLE|url|https://openjdk.java.net/groups/net/httpclient/intro.html^0|G|B|0|0|0|7|B|J|6|Q|4|1E|6|1L|2|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@$A|10|B|11|K|L]|$A|12|B|13|K|L]|$A|14|B|15|K|L]|$A|16|B|17|K|L]|$A|18|B|19|K|L]]|9|@]|C|$]]|$1|M|3|-4|5|6|7|1A|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

For Java 11 you can use the new <a href="https://openjdk.java.net/groups/net/httpclient/intro.html" rel="nofollow noreferrer">HTTP client</a>:
<pre><code>HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
 .uri(URI.create(&quot;http://localhost/api&quot;))
 .header(&quot;Content-Type&quot;, &quot;application/json&quot;)
 .POST(ofInputStream(() -&gt; getClass().getResourceAsStream(
 &quot;/some-data.json&quot;)))
 .build();

client.sendAsync(request, BodyHandlers.ofString())
 .thenApply(HttpResponse::body)
 .thenAccept(System.out::println)
 .join();
</code></pre>
You can use publishers from <code>InputStream</code>, <code>String</code>, <code>File</code>. Converting JSON to a <code>String</code> or <code>IS</code> can be done with Jackson.

blocks|key|584750|text|带有apache+httpClient+4的java8|type|unstyled|depth|inlineStyleRanges|entityRanges|data|584751|CloseableHttpClient+client+=+HttpClientBuilder.create().build();
HttpPost+httpPost+=+new+HttpPost("www.site.com");


String+json+=+"details={\"name\":\"myname\",\"age\":\"20\"}+";

++++++++try+{
++++++++++++StringEntity+entity+=+new+StringEntity(json);
++++++++++++httpPost.setEntity(entity);

++++++++++++//+set+your+POST+request+headers+to+accept+json+contents
++++++++++++httpPost.setHeader("Accept",+"application/json");
++++++++++++httpPost.setHeader("Content-type",+"application/json");

++++++++++++try+{
++++++++++++++++//+your+closeablehttp+response
++++++++++++++++CloseableHttpResponse+response+=+client.execute(httpPost);

++++++++++++++++//+print+your+status+code+from+the+response
++++++++++++++++System.out.println(response.getStatusLine().getStatusCode());

++++++++++++++++//+take+the+response+body+as+a+json+formatted+string+
++++++++++++++++String+responseJSON+=+EntityUtils.toString(response.getEntity());

++++++++++++++++//+convert/parse+the+json+formatted+string+to+a+json+object
++++++++++++++++JSONObject+jobj+=+new+JSONObject(responseJSON);

++++++++++++++++//print+your+response+body+that+formatted+into+json
++++++++++++++++System.out.println(jobj);

++++++++++++}+catch+(IOException+e)+{
++++++++++++++++e.printStackTrace();
++++++++++++}+catch+(JSONException+e)+{

++++++++++++++++e.printStackTrace();
++++++++++++}

++++++++}+catch+(UnsupportedEncodingException+e)+{
++++++++++++e.printStackTrace();
++++++++}|code-block|syntax|javascript|584752|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Java 8 with apache httpClient 4

<pre><code>CloseableHttpClient client = HttpClientBuilder.create().build();
HttpPost httpPost = new HttpPost("www.site.com");


String json = "details={\"name\":\"myname\",\"age\":\"20\"} ";

 try {
 StringEntity entity = new StringEntity(json);
 httpPost.setEntity(entity);

 // set your POST request headers to accept json contents
 httpPost.setHeader("Accept", "application/json");
 httpPost.setHeader("Content-type", "application/json");

 try {
 // your closeablehttp response
 CloseableHttpResponse response = client.execute(httpPost);

 // print your status code from the response
 System.out.println(response.getStatusLine().getStatusCode());

 // take the response body as a json formatted string 
 String responseJSON = EntityUtils.toString(response.getEntity());

 // convert/parse the json formatted string to a json object
 JSONObject jobj = new JSONObject(responseJSON);

 //print your response body that formatted into json
 System.out.println(jobj);

 } catch (IOException e) {
 e.printStackTrace();
 } catch (JSONException e) {

 e.printStackTrace();
 }

 } catch (UnsupportedEncodingException e) {
 e.printStackTrace();
 }
</code></pre>

blocks|key|800789|text|Java+11实现HTTP/2和Web套接字的HTTP客户端API的标准化，可在java.net.HTTP.*中找到|type|unstyled|depth|inlineStyleRanges|entityRanges|data|800790|String+payload+=+"{\"name\":+\"myname\",+\"age\":+\"20\"}";
HttpClient+client+=+HttpClient.newHttpClient();

HttpRequest+request+=+HttpRequest.newBuilder(URI.create("www.site.com"))
++++++++++++.header("content-type",+"application/json")
++++++++++++.POST(HttpRequest.BodyPublishers.ofString(payload))
++++++++++++.build();
++++
HttpResponse<String>+response+=+client.send(request,+BodyHandlers.ofString());|code-block|syntax|javascript|800791|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Java 11 standardization of HTTP client API that implements HTTP/2 and Web Socket, and can be found at java.net.HTTP.*:
<pre><code>String payload = &quot;{\&quot;name\&quot;: \&quot;myname\&quot;, \&quot;age\&quot;: \&quot;20\&quot;}&quot;;
HttpClient client = HttpClient.newHttpClient();

HttpRequest request = HttpRequest.newBuilder(URI.create(&quot;www.site.com&quot;))
 .header(&quot;content-type&quot;, &quot;application/json&quot;)
 .POST(HttpRequest.BodyPublishers.ofString(payload))
 .build();
 
HttpResponse&lt;String&gt; response = client.send(request, BodyHandlers.ofString());
</code></pre>

I would like to make a simple HTTP POST using JSON in Java.

Let's say the URL is <code>www.site.com</code>

and it takes in the value <code>{"name":"myname","age":"20"}</code> labeled as <code>'details'</code> for example. 

How would I go about creating the syntax for the POST?

I also can't seem to find a POST method in the JSON Javadocs.

HTTP POST using JSON in Java

JSON

Java

我想用Java中的JSON创建一个简单的HTTP POST。假设URL是www.site.com例如，它接受标记为'details'的值{"name":"myname","age":"20"}。我该如何创建帖子的语法呢？我似乎在JSON Javadoc中也找不到POST方法。

问Java中使用JSON的HTTP POST
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