java http请求获取图片并返回文件流给前端的方法步骤

<!--web 模块-->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

@Configuration
public class RestTemplateConfig {
    @Bean(name = "restTemplateJQSJ")
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
}

import org.springframework.http.*;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.*;

import javax.servlet.http.HttpServletResponse;
import java.io.*;

@RestController
@RequestMapping("/api")
public class ImageController {

    @Autowired
    @Qualifier("restTemplateJQSJ")
    private RestTemplate restTemplate;

    @GetMapping("/image")
    public void getImage(HttpServletResponse response) throws IOException {
        String imageUrl = "http://获取图片的地址";

        // 设置HTTP头部信息
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.IMAGE_JPEG); // 假设图片类型为JPEG，根据实际情况调整

        // 发送HTTP请求获取图片数据流
        ResponseEntity<byte[]> imageResponse = restTemplate.exchange(imageUrl, HttpMethod.GET, new HttpEntity<>(headers), byte[].class);

        // 将图片数据流写入响应输出流
        if (imageResponse.getStatusCode() == HttpStatus.OK && imageResponse.getBody() != null) {
            response.setContentType(MediaType.IMAGE_JPEG_VALUE); // 设置响应内容类型
            response.getOutputStream().write(imageResponse.getBody()); // 将图片数据写入响应输出流
        } else {
            response.setStatus(HttpStatus.NOT_FOUND.value()); // 处理请求失败的情况
        }
    }
}