Spring boot集成Go-FastDFS实现图片上传删除等功能

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5)在返回的url后加?download=0,查看图片

四．实例实现功能
1）图片上传
2）图片删除
3）图片访问
4）图片水印添加
五．创建Spring boot项目，写代码实现功能
1）pom.xml添加依赖

  <!--工具包-->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>${hutool.version}</version>
        </dependency>

2）核心代码，使用go-fastdhs上传图片并添加水印及删除图片工具类

@Component
public class GoFastdfsClientUtil {

    @Value("${camera.upload.path}")
    private String uploadPath;

    @Value("${camera.delete.path}")
    private String deletePath;

    private final Logger logger = LoggerFactory.getLogger(GoFastdfsClientUtil.class);

    /**
     * 图片上传
     * 
     * @param file
     * @param sixCode
     * @return
     * @throws IOException 
     */
    public UploadResult upload(MultipartFile file, String sixCode) throws IOException {
        UploadResult uploadResult = new UploadResult();
        ByteArrayOutputStream bos = addWatermark(file, sixCode);
        byte[] b = bos.toByteArray();
        ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(b);
        InputStreamResource isr = new InputStreamResource(byteArrayInputStream, file.getOriginalFilename());
        Map<String, Object> params = new HashMap<>();
        params.put("file", isr);
        params.put("path", "image");
        params.put("output", "json");
        // 场景
        params.put("scene", "image");
        String resp = HttpUtil.post(uploadPath, params);
        Console.log("resp: {}", resp);
        JSONObject exJson = JSONObject.parseObject(resp);
        uploadResult = JSON.toJavaObject(exJson, UploadResult.class);
        return uploadResult;
    }

    /**
     * 图片删除
     * 
     * @param fileUrl
     */
    public void deleteImage(String md5) {
        if (StringUtils.isEmpty(md5)) {
            return;
        }
        try {
            Map<String, Object> params = new HashMap<>();
            params.put("md5", md5);
            HttpUtil.post(deletePath, params);
        } catch (Exception e) {
            logger.warn(e.getMessage());
        }
    }

    /**
     * 加水印
     * 
     * @param myfile
     * @param sixCode
     * @return
     * @throws IOException
     */
    private ByteArrayOutputStream addWatermark(MultipartFile myfile, String sixCode) throws IOException {
        InputStream in = myfile.getInputStream();
        BufferedInputStream bis = new BufferedInputStream(in);
        BufferedImage image = ImageIO.read(bis);
        int height = image.getHeight();
        int width = image.getWidth();
        // 加水印
        Graphics2D g = image.createGraphics();
        g.drawImage(image, 0, 0, width, height, null);
        g.setColor(new Color(128, 128, 128));
        // 字体
        int num = 0;
        if (width > height) {
            num = height / 30;
        } else {
            num = width / 30;
        }
        g.setFont(new Font("微软雅黑", Font.PLAIN, num));
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        String date = formatter.format(new Date());
        String watermarkContent = "拍摄时间:" + date + "&摄像头编码:" + sixCode;
        // 设置水印坐标
        String[] split = watermarkContent.split("&");
        int x = 10;
        int y = height - 10;
        for (int i = 0; i < split.length; i++) {
            g.drawString(split[i], x, y -= g.getFontMetrics().getHeight());
        }
        g.dispose();
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        ImageIO.write(image, "jpg", bos);
        return bos;
    }
}

解释：这里我们事先在配置文件中配置好了文件的上传路径以及删除路径，配置如下：

camera:  
  upload:
    path: http://localhost:8080/group1/upload  
  delete:
    path: http://localhost:8080/group1/delete
  visit:
    path: http://localhost:8080

3）上面的方法中我们将图片上传后的返回值转换为结果集对象，对象定义如下：
public class UploadResult implements Serializable{

/**
 * 
 */
private static final long serialVersionUID = 5534287808864118463L;
private String url;
private String md5;
private String path;
private String domain;
private String scene;
private BigInteger size;
private BigInteger mtime;
private String scenes;
private String retmsg;
private int retcode;
private String src;
......get,set方法.....

}

4）在实际应用中编写控制层方法调用核心工具类的上传，删除方法即可
总结：本次总结主要描述了spring boot集成go-fastdfs上传图片的核心方法，没有具体的测试展示，其实go-fastdfs的使用很简单，接口编写也很简单

Spring boot集成Go-FastDFS实现图片上传删除等功能

标签：inpu   @Value   背景   设计   spl   ret   lease   情况   启动   

原文地址：https://blog.51cto.com/13501268/2490393