您需要像这样将JSON内容添加到请求主体：
GenericData data = new GenericData();data.put("longUrl", "http://www.google.com/");JsonHttpContent content = new JsonHttpContent();content.data = data;request.content = content;对于响应，请尝试使用JsonHttpParser而不是JsonCParser。您需要创建GenericJson的子类，该子类包含要检索的每个JSON属性带有@Key批注的字段。您可以使用response.parseAsString（）查看所有可用属性。
这是一个完整的工作示例：
import com.google.api.client.googleapis.GoogleHeaders;import com.google.api.client.googleapis.GoogleTransport;import com.google.api.client.http.HttpRequest;import com.google.api.client.http.HttpResponse;import com.google.api.client.http.HttpTransport;import com.google.api.client.json.GenericJson;import com.google.api.client.json.JsonHttpContent;import com.google.api.client.json.JsonHttpParser;import com.google.api.client.util.GenericData;import com.google.api.client.util.Key;public class Shortener { public static final String GOOGL_URL = "https://www.googleapis.com/urlshortener/v1/url"; public static void main(String[] args) throws Exception { // setup up the HTTP transport HttpTransport transport = GoogleTransport.create(); // add default headers GoogleHeaders defaultHeaders = new GoogleHeaders(); transport.defaultHeaders = defaultHeaders; transport.defaultHeaders.put("Content-Type", "application/json"); transport.addParser(new JsonHttpParser()); // build the HTTP GET request and URL HttpRequest request = transport.buildPostRequest(); request.setUrl(GOOGL_URL); GenericData data = new GenericData(); data.put("longUrl", "http://www.google.com/"); JsonHttpContent content = new JsonHttpContent(); content.data = data; request.content = content; HttpResponse response = request.execute(); Result result = response.parseAs(Result.class); System.out.println(result.shortUrl); } public static class Result extends GenericJson { @Key("id") public String shortUrl; }}
