java调用第三方接口

方法一：使用HttpURLConnection类调用第三方接口的示例代码：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

public class ThirdPartyApiCaller {
    public static void main(String[] args) {
        try {
            // 创建URL对象
            URL url = new URL("https://api.example.com/endpoint");

            // 创建HttpURLConnection对象
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();

            // 设置请求方法为GET
            connection.setRequestMethod("GET");

            // 发送请求
            int responseCode = connection.getResponseCode();

            // 检查响应码
            if (responseCode == HttpURLConnection.HTTP_OK) {
                // 读取响应内容
                BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                String line;
                StringBuilder response = new StringBuilder();
                while ((line = reader.readLine()) != null) {
                    response.append(line);
                }
                reader.close();

                // 处理响应内容
                System.out.println(response.toString());
            } else {
                // 处理错误响应
                System.out.println("请求失败，响应码：" + responseCode);
            }

            // 关闭连接
            connection.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

以上代码是使用GET方法发送请求

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;

public class ThirdPartyApiCaller {
    public static void main(String[] args) {
        try {
            // 创建URL对象
            URL url = new URL("https://api.example.com/endpoint");

            // 创建HttpURLConnection对象
            HttpURLConnection connection = (HttpURLConnection) url.openConnection();

            // 设置请求方法为POST
            connection.setRequestMethod("POST");

            // 设置请求头
            connection.setRequestProperty("Content-Type", "application/json");

            // 启用输出流
            connection.setDoOutput(true);

            // 创建请求体
            String requestBody = "{\"param1\":\"value1\", \"param2\":\"value2\"}";

            // 将请求体写入输出流
            DataOutputStream outputStream = new DataOutputStream(connection.getOutputStream());
            outputStream.write(requestBody.getBytes(StandardCharsets.UTF_8));
            outputStream.flush();
            outputStream.close();

            // 发送请求
            int responseCode = connection.getResponseCode();

            // 检查响应码
            if (responseCode == HttpURLConnection.HTTP_OK) {
                // 读取响应内容
                BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
                String line;
                StringBuilder response = new StringBuilder();
                while ((line = reader.readLine()) != null) {
                    response.append(line);
                }
                reader.close();

                // 处理响应内容
                System.out.println(response.toString());
            } else {
                // 处理错误响应
                System.out.println("请求失败，响应码：" + responseCode);
            }

            // 关闭连接
            connection.disconnect();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

以上代码是使用POST方法发送请求

方法二：使用Apache HttpClient库来调用第三方接口

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

public class ThirdPartyApiCaller {
    public static void main(String[] args) {
        try {
            // 创建HttpClient对象
            HttpClient client = HttpClientBuilder.create().build();

            // 创建HttpGet对象
            HttpGet request = new HttpGet("https://api.example.com/endpoint");

            // 发送请求
            HttpResponse response = client.execute(request);

            // 检查响应码
            if (response.getStatusLine().getStatusCode() == 200) {
                // 读取响应内容
                HttpEntity entity = response.getEntity();
                String responseBody = EntityUtils.toString(entity);

                // 处理响应内容
                System.out.println(responseBody);
            } else {
                // 处理错误响应
                System.out.println("请求失败，响应码：" + response.getStatusLine().getStatusCode());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

以上代码使用HttpClient库发送GET请求

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

public class ThirdPartyApiCaller {
    public static void main(String[] args) {
        try {
            // 创建HttpClient对象
            HttpClient client = HttpClientBuilder.create().build();

            // 创建HttpPost对象
            HttpPost request = new HttpPost("https://api.example.com/endpoint");

            // 设置请求头
            request.setHeader("Content-Type", "application/json");

            // 创建请求体
            String requestBody = "{\"param1\":\"value1\", \"param2\":\"value2\"}";

            // 设置请求体
            StringEntity entity = new StringEntity(requestBody);
            request.setEntity(entity);

            // 发送请求
            HttpResponse response = client.execute(request);

            // 检查响应码
            if (response.getStatusLine().getStatusCode() == 200) {
                // 读取响应内容
                HttpEntity responseEntity = response.getEntity();
                String responseBody = EntityUtils.toString(responseEntity);

                // 处理响应内容
                System.out.println(responseBody);
            } else {
                // 处理错误响应
                System.out.println("请求失败，响应码：" + response.getStatusLine().getStatusCode());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

以上代码使用HttpClient库发送POST请求