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还是先打开IDEA，使用Maven构建的Spring、SpringMVC、Mybatis的Java项目。首先添加阿里云OSS对象云存储的依赖包，在pom.xml添加如下依赖文件。

      <dependency>
            <groupId>com.aliyun.oss</groupId>
            <artifactId>aliyun-sdk-oss</artifactId>
            <version>2.5.0</version>
       </dependency>

然后编写一个上传到阿里云OSS对象云存储的工具类，OSSClientUtil.java，并交由Spring容器管理。

package com.zhenqi.util.alioss;

import java.io.*;
import java.net.URL;
import java.util.Date;
import java.util.Random;


import com.zhenqi.exception.ImgException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.aliyun.oss.OSSClient;
import com.aliyun.oss.model.ObjectMetadata;
import com.aliyun.oss.model.PutObjectResult;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;

/**
 * Created by wuming on 2018/2/6.
 */
@Component
public class OSSClientUtil {

    private static final Log log = LogFactory.getLog(OSSClientUtil.class);
    // endpoint以杭州为例，其它region请按实际情况填写 如：oss-cn-hangzhou.aliyuncs.com
    private String endpoint = "您的endpoint";
    // accessKey
    private  String accessKeyId = "您的accessKeyId";
    private  String accessKeySecret = "您的accessKeySecret";
    //空间
    private  String bucketName = "zhenqioss";
    //文件存储目录
    private  String filedir = "somnus/";

    private OSSClient ossClient;

    public OSSClientUtil() {
        ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
    }

    /**
     * 初始化
     */
    public void init() {
        ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
    }

    /**
     * 销毁
     */
    public void destory() {
        ossClient.shutdown();
    }

    /**
     * 上传图片
     *
     * @param url
     */
    public void uploadImg2Oss(String url) {
        File fileOnServer = new File(url);
        FileInputStream fin;
        try {
            fin = new FileInputStream(fileOnServer);
            String[] split = url.split("/");
            this.uploadFile2OSS(fin, split[split.length - 1]);
        } catch (FileNotFoundException e) {
            throw new ImgException("图片上传失败");
        }
    }

    public  String uploadImg2Oss(MultipartFile file) {
        if (file.getSize() > 1024 * 1024) {
            throw new ImgException("上传图片大小不能超过1M！");
        }
        String originalFilename = file.getOriginalFilename();
        String substring = originalFilename.substring(originalFilename.lastIndexOf(".")).toLowerCase();
        Random random = new Random();
        String name = random.nextInt(10000) + System.currentTimeMillis() + substring;
        try {
            InputStream inputStream = file.getInputStream();
            this.uploadFile2OSS(inputStream, name);
            return name;
        } catch (Exception e) {
            throw new ImgException("图片上传失败");
        }
    }

    /**
     * 获得图片路径
     *
     * @param fileUrl
     * @return
     */
    public String getImgUrl(String fileUrl) {
        if (!StringUtils.isEmpty(fileUrl)) {
            String[] split = fileUrl.split("/");
            return this.getUrl(this.filedir + split[split.length - 1]);
        }
        return null;
    }

    /**
     * 上传到OSS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 uploadFile2OSS(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 = ossClient.putObject(bucketName, filedir + fileName, instream, objectMetadata);
            ret = putResult.getETag();
        } catch (IOException e) {
            log.error(e.getMessage(), e);
        } finally {
            try {
                if (instream != null) {
                    instream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return ret;
    }

    /**
     * Description: 判断OSS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";
    }

    /**
     * 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(new Date().getTime() + 3600l * 1000 * 24 * 365 * 10);
        // 生成URL
        URL url = ossClient.generatePresignedUrl(bucketName, key, expiration);
        if (url != null) {
            return url.toString();
        }
        return null;
    }
}

最后到Controller层，首先将上面的工具类注入到Controller层中，以便调用。

再者就是上传图片响应的处理方法。

  @RequestMapping(value = "/upload", method = RequestMethod.POST)
  @ResponseBody
    public Map<String, Object> upload(HttpServletRequest request)
            throws IllegalStateException, IOException {
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
                request.getSession().getServletContext());
        Map<String ,Object> result=new HashMap<String ,Object>();

        // 判断 request 是否有文件上传,即多部分请求
        if (multipartResolver.isMultipart(request)) {
            // 转换成多部分request
            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
            // 取得request中的所有文件名
            Iterator<String> iter = multiRequest.getFileNames();
            while (iter.hasNext()) {
                // 取得上传文件
                MultipartFile f = multiRequest.getFile(iter.next());
                if (f != null) {
                //将图片上传到阿里云OSS对象云存储，而后根据文件名生成图片链接
                    String name=ossClientUtil.uploadImg2Oss(f);
                    String imgUrl = ossClientUtil.getImgUrl(name);
                    //本文使用的是editor.Md开源的markdown编辑器，根据其文档说明 图片上传成功返回json数据给editor.Md
                    result.put("success",1);
                    result.put("message","上传成功");
                    result.put("url",imgUrl);
                  }
             }
        }else{
        //图片上传失败返回json数据给editor.Md
            result.put("success",0);
            result.put("message","上传失败");
        }
        System.out.println(result.toString());
        return result;
    }

测试结果如下：


可以登录阿里云OSS对象云存储的控制台查看。

至此Markdown编辑器图片上传到阿里云OSS云存储上就暂时告一段落了！