HttpClient post 传输json 数据和 key/value数据

重点：
如果和以下问题匹配参考此博客

• 请求为参数为json 格式传输，且请求头的content-type为application/json
• 请求参数为key/value结构

pom坐标

        
            org.apache.httpcomponents
            httpclient
            4.5.13
        

若传输JSON格式需要使用httpClient的StringEntity ，且请求头的content-type需要设置为application/json

ps：

        CloseableHttpClient httpClient = HttpClients.createDefault();

        HttpPost httpPost = new HttpPost("http://127.0.0.1:9090");
        httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36");
        
        httpPost.setHeader("content-type", "application/json");
        
        HashMap map = new HashMap<>();
        map.put("a", "1");
        map.put("b","2");
        // map 转为JSON
        ObjectMapper objectMapper = new ObjectMapper();
        String asString = objectMapper.writeValueAsString(map);

        StringEntity entity = new StringEntity(asString,"UTF-8");
        httpPost.setEntity(entity);

        CloseableHttpResponse httpResponse = httpClient.execute(httpPost);

        HttpEntity httpEntity = httpResponse.getEntity();

        String string = EntityUtils.toString(httpEntity, "UTF-8");

        System.out.println(string);

        httpResponse.close();
        httpClient.close();

需要使用UrlEncodedFormEntity类

        CloseableHttpClient httpClient = HttpClients.createDefault();

        HttpPost httpPost = new HttpPost("http://127.0.0.1:9090");
        httpPost.setHeader("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36");
        ArrayList pairs = new ArrayList<>();
        pairs.add(new BasicNameValuePair("a", "1"));
        pairs.add(new BasicNameValuePair("b","2"));
        UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(pairs, "UTF-8");
        httpPost.setEntity(urlEncodedFormEntity);

        CloseableHttpResponse httpResponse = httpClient.execute(httpPost);

        HttpEntity httpEntity = httpResponse.getEntity();

        String string = EntityUtils.toString(httpEntity, "UTF-8");

        System.out.println(string);

        httpResponse.close();
        httpClient.close();