HttpClient基本功能的使用 Get方式

HttpClient是一个功能强大、开源的HTTP客户端库，可以用于发送HTTP要求和处理HTTP响应。使用HttpClient的Get方式发送要求需要以下步骤：
1. 创建HttpClient对象：
```
CloseableHttpClient httpClient = HttpClients.createDefault();
```
2. 创建HttpGet对象，并设置要求的URL：
```
HttpGet httpGet = new HttpGet("http://example.com/api/resource");
```
3. 履行要求并获得响应：
```
CloseableHttpResponse response = httpClient.execute(httpGet);
```
4. 获得响应的状态码：
```
int statusCode = response.getStatusLine().getStatusCode();
```
5. 获得响应的内容：
```
HttpEntity entity = response.getEntity();
String responseContent = EntityUtils.toString(entity, "UTF⑻");
```
6. 关闭HttpClient和响应：
```
response.close();
httpClient.close();
```
完全的示例代码以下：
```
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
public class HttpClientExample {
public static void main(String[] args) {
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet("http://example.com/api/resource");
try {
CloseableHttpResponse response = httpClient.execute(httpGet);
try {
int statusCode = response.getStatusLine().getStatusCode();
HttpEntity entity = response.getEntity();
String responseContent = EntityUtils.toString(entity, "UTF⑻");
System.out.println("Status Code: " + statusCode);
System.out.println("Response Content: " + responseContent);
} finally {
response.close();
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
httpClient.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
```
以上代码会发送一个GET要求到"http://example.com/api/resource"，并输出响应的状态码和内容。请注意，这里的示例代码没有处理异常情况，实际使用中需要进行异常处理。