springboot(44) : 网络图片url转发

最新推荐文章于 2024-04-17 09:51:16 发布

转载最新推荐文章于 2024-04-17 09:51:16 发布 · 370 阅读

0 ·

CC 4.0 BY-SA版权

原文链接：www.baidu.com

文章标签：

#spring boot #网络 #后端 #网路url图片转发

springboot 专栏收录该内容

54 篇文章

订阅专栏

文章描述了一个使用SpringMVC框架创建的RESTfulAPI控制器，处理GET请求下载文件，同时涉及Base64编码功能，包括从URL直接下载和处理Base64编码的URL请求解码。


import com.alibaba.gts.flm.common.utils.Base64Util;
import com.alibaba.gts.flm.dd.api.web.controller.model.UrlReq;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletResponse;
import java.io.BufferedInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

@RestController
@RequestMapping("/file")
public class FileController {

    @Value("${local.ip:-}")
    private String localIp;

    @RequestMapping("/getByUrl")
    public void getByUrl(String urls, HttpServletResponse response) throws Exception {
        URL url = new URL(urls);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");

        InputStream inputStream = connection.getInputStream();
        BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        byte[] buffer = new byte[1024];
        int bytesRead;
        while ((bytesRead = bufferedInputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }
        byte[] imageBytes = outputStream.toByteArray();
        response.setContentType("image/jpeg"); // 根据实际需要设置响应的内容类型
        response.getOutputStream().write(imageBytes);
        bufferedInputStream.close();
        outputStream.close();
    }


    @RequestMapping("/getByUrl2")
    public void getByUrl2(String urls, HttpServletResponse response) throws Exception {
        String str = Base64Util.base64Restore(urls);
        if (!str.contains("http")){
            str = "http://"+localIp+":32033"+str;
        }
        URL url = new URL(str);
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");

        InputStream inputStream = connection.getInputStream();
        BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        byte[] buffer = new byte[1024];
        int bytesRead;
        while ((bytesRead = bufferedInputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }
        byte[] imageBytes = outputStream.toByteArray();
        response.setContentType("image/jpeg"); // 根据实际需要设置响应的内容类型
        response.getOutputStream().write(imageBytes);
        bufferedInputStream.close();
        outputStream.close();
    }

    @RequestMapping("/getByUrl3")
    public void getByUrl3(@RequestBody UrlReq req, HttpServletResponse response) throws Exception {
        URL url = new URL(req.getUrl());
        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setRequestMethod("GET");

        InputStream inputStream = connection.getInputStream();
        BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

        byte[] buffer = new byte[1024];
        int bytesRead;
        while ((bytesRead = bufferedInputStream.read(buffer)) != -1) {
            outputStream.write(buffer, 0, bytesRead);
        }
        byte[] imageBytes = outputStream.toByteArray();
        response.setContentType("image/jpeg"); // 根据实际需要设置响应的内容类型
        response.getOutputStream().write(imageBytes);
        bufferedInputStream.close();
        outputStream.close();
    }
}

Base64Util

import java.util.Base64;

public class Base64Util {

    public static String base64Restore(String str) {
        byte[] decodedBytes = Base64.getDecoder().decode(str);
        return new String(decodedBytes);
    }

    public static String str2Base64(String str) {
        return Base64.getEncoder().encodeToString(str.getBytes());
    }
}