springboot调用接口获取下载地址并下载

以下是Spring Boot调用接口获取下载地址并下载的示例代码：

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;

import java.io.BufferedInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;

@SpringBootApplication
public class DownloadApplication implements CommandLineRunner {

    public static void main(String[] args) {
        SpringApplication.run(DownloadApplication.class, args);
    }

    @Override
    public void run(String... args) throws Exception {
        String apiUrl = "http://example.com/api/download"; // 接口地址
        RestTemplate restTemplate = new RestTemplate();
        ResponseEntity<String> response = restTemplate.getForEntity(apiUrl, String.class);
        String downloadUrl = response.getBody(); // 接口返回的下载地址

        // 下载文件
        String fileName = "example.txt"; // 文件名
        URL url = new URL(downloadUrl);
        BufferedInputStream inputStream = new BufferedInputStream(url.openStream());
        FileOutputStream outputStream = new FileOutputStream(fileName);
        byte[] buffer = new byte[1024];
        int count = 0;
        while ((count = inputStream.read(buffer, 0, 1024)) != -1) {
            outputStream.write(buffer, 0, count);
        }
        outputStream.close();
        inputStream.close();

        System.out.println("文件下载完成！");
    }
}

在这个示例中，我们使用了Spring Boot的RestTemplate模板来调用接口获取下载地址。然后，我们使用Java的URL类打开下载地址，并使用Java的FileOutputStream将下载的文件保存到本地磁盘。最后，我们打印一条消息来确认文件下载完成。