post请求

public class HttpRequest {
    
    @Test
    public void httpPost() throws IOException {
        //创建client
        CloseableHttpClient client=HttpClients.createDefault();

        //创建 HttpPost
        HttpPost post=new HttpPost("http://www.httpbin.org/post");
        //设置请求头
        post.setHeader("accept","application/json");
        post.setHeader("Referer","http://www.httpbin.org/");
        //设置请求参数
        StringEntity se=new StringEntity("this is request param", ContentType.APPLICATION_JSON);
        post.setEntity(se);
        //获取响应
        CloseableHttpResponse response=client.execute(post);
        HttpEntity entity=response.getEntity();
        String result=EntityUtils.toString(entity);
        //关闭流和连接
        EntityUtils.consume(entity);
        response.close();
        //解析result
        JSONObject jsonObject=JSON.parseObject(result);
        System.out.println(jsonObject.getString("data"));

    }
}

　　结果

this is request param

　　其中设置请求参数有两种方法

　　1.使用　StringEntity ，StringEntity 的更多参数查看源码可知

StringEntity se=new StringEntity("this is request param", ContentType.APPLICATION_JSON);
post.setEntity(se);

　　2. 使用 　UrlEncodedFormEntity，UrlEncodedFormEntity 的更多参数查看源码可知

NameValuePair nvp=new BasicNameValuePair("requestParam","this is request param");
List<NameValuePair> nvps=new ArrayList<>();
nvps.add(nvp);
UrlEncodedFormEntity param=new UrlEncodedFormEntity(nvps, Charset.defaultCharset());
post.setEntity(param);