老程序员，Java新手。我正在尝试运行我认为在网络上许多地方都相似的非常常见的示例代码，HttpClient httpClient = HttpClientBuilder.create().build()引发异常，我不知道为什么。我正在使用 HttpClient 4.3。
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;
public class ATest{
public static void main(String[] args) throws Exception {
String strURL = "http://192.9.10.11/cgi-bin/echo";
String message = "hello world";
// next line throwsClassNotFoundException, why?
HttpClient httpClient = HttpClientBuilder.create().build();
HttpPost httpPost = new HttpPost(strURL);
httpPost.setEntity(new StringEntity(message));
HttpResponse response = httpClient.execute(httpPost);
try {
System.out.println(response.getStatusLine());
HttpEntity entity = response.getEntity();
// do something useful with the response body
// and ensure it is fully consumed
EntityUtils.consume(entity);
} finally {
response.close();
}
}
}