java - org.apache.http.client.HttpResponseException : Bad Request - Sending JSON request via REST

Question

当我尝试运行此程序时，收到错误 org.apache.http.client.HttpResponseException:错误请求。

您能帮我理解应该修改代码的位置吗？

我正在使用以下库httpclient-4.4.1.jarhttpcore-4.4.1.jarcommons-logging-1.1.2.jar

org.apache.http.client.HttpResponseException:错误请求

这是代码:

import org.apache.http.client.HttpClient;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;

public class Test {
public static void main(String args[]) throws Exception {
    HttpClient httpclient = new DefaultHttpClient();
    HttpPost postRequest = new HttpPost("http://localhost:8080/engine-rest/process-definition/key/demo-scaling/start");
    try {
        StringEntity input = new StringEntity("(\"variables\":{}, \"businessKey\" : \"AAA001\")");
        postRequest.addHeader("Accept", "application/json");
        postRequest.setEntity(input);
        postRequest.addHeader("Content-Type", "application/json");
        ResponseHandler<String> responseHandler = new BasicResponseHandler();
        String responseBody = httpclient.execute(postRequest, responseHandler);
        System.out.println(responseBody);
    } catch (Exception e) {

        e.printStackTrace();
    } finally {
        httpclient.getConnectionManager().shutdown();
    }
}

}

Answer 1

好的，试试这个:

 HttpClient httpClient = HttpClientBuilder.create().build();

    try {
        HttpPost request = new HttpPost("http://localhost:8080/engine-rest/process-definition/key/demo-scaling/start");
        StringEntity params =new StringEntity("variables={\"businessKey\":\"AAA001\"}");
        request.addHeader("content-type", "application/x-www-form-urlencoded");
        request.setEntity(params);
        HttpResponse response = httpClient.execute(request);

        System.out.println(response);
    }catch (Exception ex) {
        // handle Exceptions
    }

使用 httpclientbuilder 获取客户端(DefaultHttpClient -> 已弃用)，我不确定您是否有有效的 JSON 数据，这只是我的建议。