[开发|java] java 发送get请求获取数据

谁借莪１个温暖的怀抱￠ 2024-03-22 21:31 36阅读 0赞

1.  使用Java标准库中的`HttpURLConnection`：  
    代码示例:

import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.net.HttpURLConnection;
    import java.net.URL;
    
    public class GetRequestUsingHttpURLConnection {
        
        public static void main(String[] args) {
        
            String url = "https://api.example.com/data"; // 替换成实际的API地址
    
            try {
        
                URL apiUrl = new URL(url);
                HttpURLConnection connection = (HttpURLConnection) apiUrl.openConnection();
                connection.setRequestMethod("GET");
    
                int responseCode = connection.getResponseCode();
                if (responseCode == HttpURLConnection.HTTP_OK) {
        
                    BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                    String inputLine;
                    StringBuffer response = new StringBuffer();
    
                    while ((inputLine = reader.readLine()) != null) {
        
                        response.append(inputLine);
                    }
                    reader.close();
    
                    System.out.println(response.toString());
                } else {
        
                    System.out.println("GET request failed. Response code: " + responseCode);
                }
            } catch (IOException e) {
        
                e.printStackTrace();
            }
        }
    }

1.  使用OkHttp库：  
    安装依赖

<dependency>
        <groupId>com.squareup.okhttp3</groupId>
        <artifactId>okhttp</artifactId>
        <version>4.9.1</version>
    </dependency>

代码示例

import okhttp3.OkHttpClient;
    import okhttp3.Request;
    import okhttp3.Response;
    
    import java.io.IOException;
    
    public class GetRequestUsingOkHttp {
        
        public static void main(String[] args) {
        
            String url = "https://api.example.com/data"; // 替换成实际的API地址
    
            OkHttpClient httpClient = new OkHttpClient();
    
            Request request = new Request.Builder()
                    .url(url)
                    .get()
                    .build();
    
            try {
        
                Response response = httpClient.newCall(request).execute();
                if (response.isSuccessful()) {
        
                    String responseData = response.body().string();
                    System.out.println(responseData);
                } else {
        
                    System.out.println("GET request failed. Response code: " + response.code());
                }
            } catch (IOException e) {
        
                e.printStackTrace();
            }
        }
    }