在Java中進行網絡請求可以使用Java API中提供的類庫，比如URL、HttpURLConnection和HttpClient等。下面是一個使用Java API進行網絡請求的簡單示例：

1. 使用URL類進行GET請求：

import java.net.*;
import java.io.*;

public class HttpClientExample {
    public static void main(String[] args) {
        try {
            URL url = new URL("https://jsonplaceholder.typicode.com/posts/1");
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.connect();

            BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            String inputLine;
            StringBuffer response = new StringBuffer();

            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
            }
            in.close();

            System.out.println(response.toString());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

2. 使用HttpClient類進行GET請求：

import org.apache.http.client.*;
import org.apache.http.impl.client.*;
import org.apache.http.client.methods.*;
import org.apache.http.util.*;

public class HttpClientExample {
    public static void main(String[] args) {
        try {
            CloseableHttpClient httpClient = HttpClients.createDefault();
            HttpGet httpGet = new HttpGet("https://jsonplaceholder.typicode.com/posts/1");
            CloseableHttpResponse response = httpClient.execute(httpGet);

            HttpEntity entity = response.getEntity();
            String result = EntityUtils.toString(entity);

            System.out.println(result);

            response.close();
            httpClient.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

這是一個簡單的示例，實際中可能需要根據具體的需求來配置請求參數、處理響應等。可以根據自己的需求選擇使用URL類或HttpClient類來進行網絡請求。