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  • layui上传文件组件(前后端代码实现)

    我个人博客系统上传特色图片功能就是用layui上传文件组件做的。
    另外采用某个生态框架，尽量都统一用该生态框架对应的解决方案，因为这样一来，有这么几个好处?
    1.统一而不杂糅,有利于制定相应的编码规范，方便维护;
    2.复用性高;
    3.不会因公司开发人员的离职而导致一时找不到人来做这件事情;

    就这三点，也足以让企业降低相应的开发成本

    前端代码实现:

    <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>upload</title>
  <link rel="stylesheet" href="../layui/css/layui.css" media="all">
</head>
<body>
 
<button type="button" class="layui-btn" id="uploadExample">
  <i class="layui-icon">&#xe67c;</i>上传安装包或更新包
</button>
 
<script src="../layui/layui.js"></script>
<script>
layui.use('upload', function(){
  var upload = layui.upload;
   
  //执行实例
  var uploadInst = upload.render({
    elem: '#uploadExample' //绑定元素
    ,url: 'http://localhost:8090/blog-web/user/uploadFile' //上传接口
    ,accept: 'file'
    ,done: function(res){
          layui.use('layer', function(){
              var layer = layui.layer;

                layer.msg(res.url, {
                       time: 6000, //6s后自动关闭
                       icon:1
                 });
            });
    }
    ,error: function(){
      //请求异常回调
    }
  });
});
</script>
</body>
</html>

    后端代码(我在这里采用的是腾讯云对象存储):

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@PostMapping(value = "/uploadFile")
    @ApiOperation("上传文件")
    public JSONObject uploadFile(HttpServletRequest request) throws IOException {
        JSONObject json = new JSONObject();
        try {

            COSClientUtil cosClientUtil = new COSClientUtil();

            MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
        
            // 获取上传的文件
            MultipartFile multiFile = multipartRequest.getFile("file");

            String name = cosClientUtil.uploadFileCos(multiFile);
            
            // 文件名称
            logger.info("name = " + name);

            // 获取文件路径
            String fileUrl = cosClientUtil.getFileUrl(name);

            logger.info("fileUrl = " + fileUrl);

            // 对文件路径进行处理
            String dbFileUrl = fileUrl.substring(0, fileUrl.indexOf("?"));
            logger.info("dbFileUrl = " + dbFileUrl);
            json.put("url", dbFileUrl);
            json.put(CommonEnum.RETURN_CODE, "000000");
            json.put(CommonEnum.RETURN_MSG, "success");
        } catch (Exception e) {
            e.printStackTrace();

            json.put(CommonEnum.RETURN_CODE, "333333");
            json.put(CommonEnum.RETURN_MSG, "特殊异常");

        }

        return json;
    }

    通用腾讯云对象存储工具类:
    对于腾讯云对象存储不明白的，可以参考官方文档:
    https://cloud.tencent.com/document/product/436/6474

    import com.qcloud.cos.COSClient;  
import com.qcloud.cos.ClientConfig;  
import com.qcloud.cos.auth.BasicCOSCredentials;  
import com.qcloud.cos.auth.COSCredentials;
import com.qcloud.cos.http.HttpMethodName;
import com.qcloud.cos.model.GetObjectRequest;
import com.qcloud.cos.model.ObjectMetadata;
import com.qcloud.cos.model.PutObjectRequest;
import com.qcloud.cos.model.PutObjectResult;  
import com.qcloud.cos.region.Region;
import org.apache.http.ProtocolException;
import org.springframework.web.multipart.MultipartFile;  
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;  
import java.util.Date;  
import java.util.Random; 

public class COSClientUtil {
      
    private COSClient cOSClient;  
  
    private static final String ENDPOINT = "ENDPOINT";  //用户可以指定域名，不指定则为默认生成的域名

    //secretId   
    private static final String secretId = "secretId";
    
    //secretKey 
    private static final String secretKey = "secretKey";
    
    //存储桶名称    
    private static final String bucketName = "bucketName";//公有读私有写
    //APPID
    private static final String APPID = "APPID";
    
    
    // 1 初始化用户身份信息(secretId, secretKey)  
    private static COSCredentials cred = new BasicCOSCredentials(secretId, secretKey);
    // 2 设置bucket的区域, COS地域的简称请参照 https://cloud.tencent.com/document/product/436/6224  
    private static ClientConfig clientConfig = new ClientConfig(new Region("ap-beijing-1"));
    // 3 生成cos客户端  
    private static COSClient cosclient = new COSClient(cred, clientConfig);
    
    public COSClientUtil() {  
        cOSClient = new COSClient(cred, clientConfig);  
    }  
  
    public static String getSecretId() {
        return secretId;
    }
    public static String getsecretKey() {
        return secretKey;
    }
    public static String getBucketName() {
        return bucketName;
    }
    public static String getAPPID() {
        return APPID;
    }

    /** 
     * 销毁
     */  
    public void destory() {  
        cOSClient.shutdown();  
    }  
  
  /**
   * 上传文件
   * @param file
   * @return
   */
   public String uploadFileCos(MultipartFile file) {
       String originalFilename = file.getOriginalFilename();  
       try {  
           InputStream inputStream = file.getInputStream();  
   
           this.uploadFileCos(inputStream, originalFilename);  
            
       } catch (Exception e) {  
           e.printStackTrace();
       }
       return originalFilename;
   }
   

   
   /**
    * 上传文件
    * @param instream
    * @param fileName
    * @return
    */
   public String uploadFileCos(InputStream instream, String fileName) {
       
       String ret = "";  
       try {  
           // 创建上传Object的Metadata  
           ObjectMetadata objectMetadata = new ObjectMetadata();  
           objectMetadata.setContentLength(instream.available());  
           objectMetadata.setCacheControl("no-cache");  
           objectMetadata.setHeader("Pragma", "no-cache");  
           objectMetadata.setContentType(getcontentType(fileName.substring(fileName.lastIndexOf("."))));  
           objectMetadata.setContentDisposition("inline;filename=" + fileName); 

           PutObjectResult putResult = cOSClient.putObject(bucketName,fileName, instream, objectMetadata);  
           ret = putResult.getETag();  
           
           System.out.println(ret);
       } catch (IOException e) {  
           e.printStackTrace();  
       } finally {  
           try {  
               if (instream != null) {  
                   instream.close();  
               }  
           } catch (IOException e) {  
               e.printStackTrace();  
           }
           
           cosclient.shutdown();
       }  
       return ret;  
       
   }

    /** 
     * 获得文件路径 在上传文件之前获取预签名链接用的。
     * 
     * @param fileUrl 
     * @return 
     */  
    public String getFileUrl(String fileUrl) {  
        return getUrl(fileUrl).toString();  
    }  
  
    /** 
     * 生成预签名的上传链接  
     * 
     * @param key 
     * @return 
     */  
    public URL getUrl(String key) {  
        // 设置URL过期时间为10年 3600l* 1000*24*365*10  
        Date expiration = new Date(System.currentTimeMillis() + 3600L * 1000 * 24 * 365 * 10);  
        // 生成URL  
        URL url = cOSClient.generatePresignedUrl(bucketName, key, expiration, HttpMethodName.PUT);  
      
        return url;  
    }  
  
    
    /** 
     * Description: 判断Cos服务文件上传时文件的contentType 
     * 
     * @param filenameExtension 文件后缀 
     * @return String 
     */  
    public static String getcontentType(String filenameExtension) {  
        if (filenameExtension.equalsIgnoreCase("bmp")) {  
            return "image/bmp";  
        }  
        if (filenameExtension.equalsIgnoreCase("gif")) {  
            return "image/gif";  
        }  
        if (filenameExtension.equalsIgnoreCase("jpeg") || filenameExtension.equalsIgnoreCase("jpg")  
                || filenameExtension.equalsIgnoreCase("png")) {  
            return "image/jpeg";  
        }  
        if (filenameExtension.equalsIgnoreCase("html")) {  
            return "text/html";  
        }  
        if (filenameExtension.equalsIgnoreCase("txt")) {  
            return "text/plain";  
        }  
        if (filenameExtension.equalsIgnoreCase("vsd")) {  
            return "application/vnd.visio";  
        }  
        if (filenameExtension.equalsIgnoreCase("pptx") || filenameExtension.equalsIgnoreCase("ppt")) {  
            return "application/vnd.ms-powerpoint";  
        }  
        if (filenameExtension.equalsIgnoreCase("docx") || filenameExtension.equalsIgnoreCase("doc")) {  
            return "application/msword";  
        }  
        if (filenameExtension.equalsIgnoreCase("xml")) {  
            return "text/xml";  
        }  
        return "image/jpeg";  
    }  
    
    
    /**
     * 下载文件
     * @param downFile
     * @param key
     * @param bucketName
     */
    public void download(File downFile, String key, String bucketName) {
        GetObjectRequest getObjectRequest = new GetObjectRequest(bucketName, key);
        ObjectMetadata downObjectMeta = cOSClient.getObject(getObjectRequest, downFile);
        System.out.println(downObjectMeta.getContentLength());
    }
    
    
   

    
    
    
    
}
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  • 原文地址：https://www.cnblogs.com/youcong/p/11440639.html
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