java如何调用rest接口

在Java中调用REST接口通常使用HttpURLConnection或HttpClient来发送HTTP请求并接收响应。以下是一个简单的示例代码：

使用HttpURLConnection：

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


public class RestClient {


    public static void main(String[] args) {

        try {
    
            URL url = new URL("http://example.com/api/resource");
    
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    
            conn.setRequestMethod("GET");
    
            conn.setRequestProperty("Content-Type", "application/json");
    

            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();

        }

    }

}
    

使用HttpClient：

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 RestClient {


    public static void main(String[] args) {
    
        HttpClient httpClient = HttpClientBuilder.create().build();
    
        HttpGet request = new HttpGet("http://example.com/api/resource");
    
        request.addHeader("Content-Type", "application/json");


        try {
    
            HttpResponse response = httpClient.execute(request);
    
            String responseBody = EntityUtils.toString(response.getEntity());
    
            System.out.println(responseBody);

        }
 catch (Exception e) {
    
            e.printStackTrace();

        }

    }

}
    

上述代码示例使用GET方法调用REST接口，并输出响应内容。根据实际情况，您可能需要修改HTTP方法、请求头或请求体等参数。

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