HttpGet 类型未定义方法 addHeader (String, String)

Question

我有这个程序：

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

public class ApplicationRESTFul {

    public static void main(String[] args) {

        String url = "http://www.google.com/search?q=httpClient";

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

        request.addHeader("Accept", "application/json");

    }

}

但我从 eclipse 收到了这条消息

the method addHeader (String, String) is undefined for the type HttpGet

我正在使用这个库，正如我在文档中看到的那样，该方法应该存在 (org.apache.httpcomponents.httpclient_4.5)

http://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/org/apache/http/client/methods/HttpGet.html

Answer 1

从 maven 导入依赖而不是在类路径中添加 lib 解决了问题

 <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.3.6</version>
        </dependency>

Answer 2

我通过将 httpcore JAR 添加到 class 路径解决了这个问题。添加来自 maven 的依赖项也会添加 httpcore JAR 而不仅仅是 httpclient JAR，这就是它也有效的原因。

HttpGet 类型未定义方法 addHeader (String, String)

the method addHeader (String, String) is undefined for the type HttpGet

java

rest

apache-httpclient-4.x