Java

curl POST with JSON Input and JSON Output

See more CURL Examples

Demonstrates running a simple curl command with JSON input and JSON output. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    // Run the following curl command

    //  curl -X POST https://httpbin.org/post \
    //       -H "Content-Type: application/json" \
    //       -d '{
    //             "title": "foo",
    //             "body": "bar",
    //             "userId": 1
    //           }'

    // The backslashes at the end of lines are not required.  Chilkat ignores them if present.
    CkStringBuilder sbTargetCurl = new CkStringBuilder();
    sbTargetCurl.AppendLn(" curl -X POST https://httpbin.org/post \\");
    sbTargetCurl.AppendLn("      -H \"Content-Type: application/json\" \\");
    sbTargetCurl.AppendLn("      -d '{");
    sbTargetCurl.AppendLn("            \"title\": \"foo\",");
    sbTargetCurl.AppendLn("            \"body\": \"bar\",");
    sbTargetCurl.AppendLn("            \"userId\": 1");
    sbTargetCurl.AppendLn("          }'");

    CkHttpCurl httpCurl = new CkHttpCurl();

    // Run the curl command.
    success = httpCurl.DoYourThing(sbTargetCurl.getAsString());
    if (success == false) {
        System.out.println(httpCurl.lastErrorText());
        return;
        }

    CkJsonObject responseJson = new CkJsonObject();
    responseJson.put_EmitCompact(false);

    httpCurl.GetResponseJson(responseJson);

    int statusCode = httpCurl.get_StatusCode();
    System.out.println("response status code: " + statusCode);

    System.out.println(responseJson.emit());

    // Output:

    // response status code: 200
    // {
    //   "args": {},
    //   "data": "{\r\n            \"title\": \"foo\",\r\n            \"body\": \"bar\",\r\n            \"userId\": 1\r\n          }",
    //   "files": {},
    //   "form": {},
    //   "headers": {
    //     "Content-Length": "96",
    //     "Content-Type": "application/json",
    //     "Host": "httpbin.org",
    //     "X-Amzn-Trace-Id": "Root=1-69e8db8b-459b3bdf7b7a3bc749184968"
    //   },
    //   "json": {
    //     "body": "bar",
    //     "title": "foo",
    //     "userId": 1
    //   },
    //   "origin": "123.222.222.222",
    //   "url": "https://httpbin.org/post"
    // }

    // ----------------------------------------------------------------------------------
    // Another example:

    // curl -X POST https://postman-echo.com/post \
    //      -H "Content-Type: application/json" \
    //      -d '{"foo":"bar"}'

    String targetCurl = "curl -X POST https://postman-echo.com/post -H \"Content-Type: application/json\" -d '{\"foo\":\"bar\"}'";

    // Run the curl command.
    success = httpCurl.DoYourThing(targetCurl);
    if (success == false) {
        System.out.println(httpCurl.lastErrorText());
        return;
        }

    httpCurl.GetResponseJson(responseJson);

    statusCode = httpCurl.get_StatusCode();
    System.out.println("response status code: " + statusCode);

    System.out.println(responseJson.emit());

    // Output:

    // response status code: 200
    // {
    //   "args": {},
    //   "data": {
    //     "foo": "bar"
    //   },
    //   "files": {},
    //   "form": {},
    //   "headers": {
    //     "host": "postman-echo.com",
    //     "content-length": "13",
    //     "content-type": "application/json",
    //     "x-forwarded-proto": "https",
    //     "accept-encoding": "gzip, br"
    //   },
    //   "json": {
    //     "foo": "bar"
    //   },
    //   "url": "https://postman-echo.com/post"
    // }
  }
}