make a post request call using httpclient in java

1HttpClientPostJSON.java
2
3package com.mkyong.java11.jep321;
4
5import java.io.IOException;
6import java.net.URI;
7import java.net.http.HttpClient;
8import java.net.http.HttpRequest;
9import java.net.http.HttpResponse;
10import java.time.Duration;
11
12public class HttpClientPostJSON {
13
14    private static final HttpClient httpClient = HttpClient.newBuilder()
15            .version(HttpClient.Version.HTTP_2)
16            .connectTimeout(Duration.ofSeconds(10))
17            .build();
18
19    public static void main(String[] args) throws IOException, InterruptedException {
20
21        // json formatted data
22        String json = new StringBuilder()
23                .append("{")
24                .append("\"name\":\"mkyong\",")
25                .append("\"notes\":\"hello\"")
26                .append("}").toString();
27
28        // add json header
29        HttpRequest request = HttpRequest.newBuilder()
30                .POST(HttpRequest.BodyPublishers.ofString(json))
31                .uri(URI.create("https://httpbin.org/post"))
32                .setHeader("User-Agent", "Java 11 HttpClient Bot") // add request header
33                .header("Content-Type", "application/json")
34                .build();
35
36        HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
37
38        // print status code
39        System.out.println(response.statusCode());
40
41        // print response body
42        System.out.println(response.body());
43
44    }
45
46}

1package com.zetcode;
2
3import com.fasterxml.jackson.databind.ObjectMapper;
4
5import java.io.IOException;
6import java.net.URI;
7import java.net.http.HttpClient;
8import java.net.http.HttpRequest;
9import java.net.http.HttpResponse;
10import java.util.HashMap;
11
12public class HttpClientPost {
13
14    public static void main(String[] args) throws IOException, InterruptedException {
15
16        var values = new HashMap<String, String>() {{
17            put("name", "John Doe");
18            put ("occupation", "gardener");
19        }};
20
21        var objectMapper = new ObjectMapper();
22        String requestBody = objectMapper
23                .writeValueAsString(values);
24
25        HttpClient client = HttpClient.newHttpClient();
26        HttpRequest request = HttpRequest.newBuilder()
27                .uri(URI.create("https://httpbin.org/post"))
28                .POST(HttpRequest.BodyPublishers.ofString(requestBody))
29                .build();
30
31        HttpResponse<String> response = client.send(request,
32                HttpResponse.BodyHandlers.ofString());
33
34        System.out.println(response.body());
35    }
36}
37