httpClient调用海康威视/ISAPI/Streaming/channels/1/picture接口的代码

以下是使用HttpClient调用海康威视/ISAPI/Streaming/channels/1/picture接口的示例代码：

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.Base64;

import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

public class HttpTest {

    public static void main(String[] args) throws ClientProtocolException, IOException {
        String url = "http://192.168.1.1/ISAPI/Streaming/channels/1/picture";
        String username = "admin";
        String password = "admin123";
        String auth = "Basic " + Base64.getEncoder().encodeToString((username + ":" + password).getBytes(StandardCharsets.UTF_8));
        
        HttpHost proxy = new HttpHost("127.0.0.1", 8888);
        RequestConfig requestConfig = RequestConfig.custom()
                .setProxy(proxy)
                .build();
        
        HttpUriRequest request = new HttpGet(url);
        request.setHeader("Authorization", auth);
        request.setConfig(requestConfig);
        
        try (CloseableHttpClient httpClient = HttpClientBuilder.create().build()) {
            HttpResponse response = httpClient.execute(request);
            
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                byte[] data = EntityUtils.toByteArray(entity);
                try (FileOutputStream fos = new FileOutputStream("image.jpg")) {
                    fos.write(data);
                }
            }
        }
    }

}

注意，这里使用了Basic认证，需要将用户名和密码进行Base64编码后添加到请求头中。另外，如果需要使用代理，可以通过设置RequestConfig来指定代理。最后，将图片数据保存到本地文件中。