腾讯云图片上传-阿里云开发者社区

示例环境:JDK8+MAVEN3+SSM(Spring+SpringMVC+MyBatis Plus或者MyBatis)

现在比较流行的除了分布式或微服务就是动静分离。

动静分离，以nginx集群为例，nginx通常加载静态资源(js,img,css等）效率相对tomcat等应用服务器效率是非常高的，由其专门处理静态资源，而动态资源，通常由tomcat等应用服务器来处理，应用服务器处理动态资源的效率比nginx处理静态资源效率又要高很多很多。就将它们做一个分工。利于静态资源处理就使用nginx，利于动态资源处理使用tomcat或者其他应用服务器等。这样分离的好处，各自发挥其优势，即利于资源充分利用，又利于系统性能。

传统的图片服务器ftp，就现在而言已经没几个人在用了，当然了，wordpress相关的插件安装和主题下载就用到ftp。

当然了，还有不少企业将上传文件(包含图片等)放入线上tomcat某个文件夹下或者项目里面，这样的弊端使项目会越来越庞大，之前庞大是因为不断增长的需求，代码不得不越多，因此也会扩充容量。

不过目前很多企业通常采用比如腾讯云、阿里云、七牛云等对象存储，作为图片存储。

一、导入依赖

	<!-- 腾讯云 -->
	<dependency>
           <groupId>com.qcloud</groupId>
           <artifactId>cos_api</artifactId>
           <version>5.2.4</version>
	</dependency>

二、编写工具类

package com.custome;

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.model.ObjectMetadata;  
import com.qcloud.cos.model.PutObjectResult;  
import com.qcloud.cos.region.Region;  
import org.springframework.web.multipart.MultipartFile;  
import java.io.*;  
import java.net.URL;  
import java.util.Date;  
import java.util.Random; 

public class COSClientUtil {
    
    //todo 这些变量信息自行到 腾讯云对象存储控制台 获取  
 
    private COSClient cOSClient;  
  
    private static final String ENDPOINT = "test.com";  //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 = "AKIDCJ";
    // secretKey 
    private static final String secretKey = "CD7";
    // 存储通名称    
    private static final String bucketName = "test";//公有读私有写
// 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);  
    }  
  
    /** 
     * 销毁 
     */  
    public void destory() {  
        cOSClient.shutdown();  
    }  
  
    /** 
     * 上传图片 
     * 
     * @param url 
     */  
    public void uploadImg2Cos(String url) throws Exception {  
        File fileOnServer = new File(url);  
        FileInputStream fin;  
        try {  
            fin = new FileInputStream(fileOnServer);  
            String[] split = url.split("/");  
            this.uploadFile2Cos(fin, split[split.length - 1]);  
        } catch (FileNotFoundException e) {  
            throw new Exception("图片上传失败");  
        }  
    }  
  
    public String uploadFile2Cos(MultipartFile file) throws Exception {  
        if (file.getSize() > 10 * 1024 * 1024) {  
            throw new Exception("上传图片大小不能超过10M！");  
        }  
        //图片名称
        String originalFilename = file.getOriginalFilename();  
        System.out.println("originalFilename = " + originalFilename);
        //图片后缀
        String substring = originalFilename.substring(originalFilename.lastIndexOf(".")).toLowerCase();  
        System.out.println("substring = " + substring);
        Random random = new Random();  
        //生成新的图片名称(随机数0-9999+系统当前时间+上传图片名)
        String name = random.nextInt(10000) + System.currentTimeMillis() + "_" + substring;  
        try {  
            InputStream inputStream = file.getInputStream();  
            this.uploadFile2Cos(inputStream, name);  
            return name;  
        } catch (Exception e) {  
            throw new Exception("图片上传失败");  
        }  
    }  
  
    /** 
     * 获得图片路径 
     * 
     * @param fileUrl 
     * @return 
     */  
    public String getImgUrl(String fileUrl) {  
        return getUrl(fileUrl);  
    }  
  
    /** 
     * 获得url链接 
     * 
     * @param key 
     * @return 
     */  
    public String 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);  
        if (url != null) {  
            return url.toString();  
        }  
        return null;  
    }  
  
    /** 
     * 上传到COS服务器 如果同名文件会覆盖服务器上的 
     * 
     * @param instream 
     *            文件流 
     * @param fileName 
     *            文件名称 包括后缀名 
     * @return 出错返回"" ,唯一MD5数字签名 
     */  
    public String uploadFile2Cos(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);  
            // 上传文件  
            PutObjectResult putResult = cOSClient.putObject(bucketName,  fileName, instream, objectMetadata);  
            ret = putResult.getETag();  
        } catch (IOException e) {  
            e.printStackTrace();  
        } finally {  
            try {  
                if (instream != null) {  
                    instream.close();  
                }  
            } catch (IOException e) {  
                e.printStackTrace();  
            }  
        }  
        return ret;  
    }  
  
    /** 
     * 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";  
    }  
    
}

三、编写Controller方法

    @PostMapping(value="/uploadPicture",produces="application/json;charset=utf-8")
    public JSONObject upModify(HttpServletRequest request, MultipartFile file) {
        
        JSONObject json = new JSONObject();

        try {
            
            COSClientUtil cosClientUtil = new COSClientUtil(); 
            
            //获取Cookie
            String cookie = CookieUtils.getCookie(request,"userCode");
            
            //解密后的userCode
            String decodeStr = Base64.decodeStr(cookie);
            
            
        
            if(!file.isEmpty()) {
                
                String name = cosClientUtil.uploadFile2Cos(file); 
                //图片名称
                System.out.println("name = " + name);
                //上传到腾讯云
                String img_url = cosClientUtil.getImgUrl(name); 
                System.out.println("img_url = " + img_url);
                
                //数据库保存图片地址
                String db_img_url = img_url.substring(0,img_url.indexOf("?"));
                System.out.println("db_img_url = " + db_img_url);
                
                SysUser user = new SysUser();
                user.setUserCode(decodeStr);
                user.setAvatar(db_img_url);
                
                //调用修改逻辑
                boolean isModifyUser = userService.updateById(user);
                
                if(isModifyUser) {
                    
                    json.put("returnCode", "000000");
                    json.put("returnMsg", "上传文件成功");

                }else {
                    json.put("returnCode", "111111");
                    json.put("returnMsg", "上传文件失败");
                
                }

            }else {
                json.put("returnCode", "222222");
                json.put("returnMsg", "参数异常");
            }
            
        } catch (Exception e) {
            e.printStackTrace();

            json.put("returnCode", "333333");
            json.put("returnMsg", "特殊异常");
    
        }
        
        return json;
    }

四、编写简单html测试

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>上传图片测试</title>
<script type="text/javascript" src="../js/jquery-1.8.0.min.js"></script>
<script type="text/javascript">
function setImg(obj){//用于进行图片上传，返回地址
    var f = $(obj).val();
    if(f == null || f == undefined || f == ''){
        return false;
    }
    if(!/\.(?:png|jpg|bmp|gif|PNG|JPG|BMP|GIF)$/.test(f))
    {
        alertLayel("类型必须是图片(.png|jpg|bmp|gif|PNG|JPG|BMP|GIF)");
        $(obj).val('');
        return false;
    }

    var data = new FormData();

    $.each($(obj)[0].files,function(i,file){
        data.append('file', file);
    });
    
    var upload_img = $("#uploadinput")[0].files[0];

    var url = window.URL.createObjectURL(upload_img);
    
    $.ajax({
        type: "POST",
        url: "uploadPicture",
        data: data,
        cache: false,
        contentType: false,     //必须false才会自动加上正确的Content-Type  
        processData: false,     //必须false才会自动加上正确的Content-Type  
        dataType:"json",
        success: function(data) {
            alert(data.returnMsg)
            
        },
        error: function(XMLHttpRequest, textStatus, errorThrown) {
             alert(XMLHttpRequest.status);
             // 状态
             alert(XMLHttpRequest.readyState);
             // 错误信息   
             alert(textStatus);
        }
    });
}

</script>
</head>
<body>
 <input type="file" id="uploadinput" name="file" onchange="setImg(this)"/>
</body>
</html>