java - Apache HttpClientBuilder 产生 ClassNotFoundException : org. apache.http.config.Lookup

Question

我正在使用HttpClient并且我使用httpCore.jar但我仍然面临异常

java.lang.ClassNotFoundException: org.apache.http.config.Lookup Error

大约

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

我的完整代码如下

package com.rest;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;

public class Test33 {

    /**
     * @param args
     * @throws IOException 
     * @throws ClientProtocolException 
     */
    public static void main(String[] args) throws ClientProtocolException, IOException {
        String url = "http://www.google.com/search?q=httpClient";

        HttpClient client = HttpClientBuilder.create().build();
        HttpGet request = new HttpGet(url);


        HttpResponse response = client.execute(request);

        System.out.println("Response Code : "
                        + response.getStatusLine().getStatusCode());

        BufferedReader rd = new BufferedReader(
            new InputStreamReader(response.getEntity().getContent()));

        StringBuffer result = new StringBuffer();
        String line = "";
        while ((line = rd.readLine()) != null) {
            result.append(line);
        }
    }
}

Answer 1

该类在 httpcore 4.4.4.jar 中可用，请检查 jar 的版本，我尝试了您的代码，它不会抛出任何未找到类的异常。如果存在 jar，请确保将 jar 添加到应用程序类路径中。