demo-file-submit-oss/src/main/java/com/fr/plugin/file/submit/oss/fun/OssDownloadHttpHandler.java

package com.fr.plugin.file.submit.oss.fun;

import com.aliyun.oss.HttpMethod;
import com.aliyun.oss.OSSClient;
import com.aliyun.oss.model.GeneratePresignedUrlRequest;
import com.fr.data.NetworkHelper;
import com.fr.decision.fun.impl.BaseHttpHandler;
import com.fr.plugin.oss.universal.config.OssUniversalConfig;
import com.fr.stable.StableUtils;
import com.fr.third.springframework.web.bind.annotation.RequestMethod;
import com.fr.web.utils.WebUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;
import java.net.URL;
import java.util.Calendar;
import java.util.Date;

public class OssDownloadHttpHandler extends BaseHttpHandler {
    @Override
    public RequestMethod getMethod() {
        return RequestMethod.POST;
    }

    @Override
    public String getPath() {
        return "/oss/download";
    }

    @Override
    public boolean isPublic() {
        return true;
    }

    @Override
    public void handle(HttpServletRequest req, HttpServletResponse res) throws Exception {
        String bucket = NetworkHelper.getHTTPRequestParameter(req, "bucket");
        String directory = NetworkHelper.getHTTPRequestParameter(req, "directory");
        String fileName = NetworkHelper.getHTTPRequestParameter(req, "fileName");
        PrintWriter writer = WebUtils.createPrintWriter(res);
        writer.write(createDownloadUrl(bucket, directory, fileName));
        writer.flush();
        writer.close();
    }

    private String createDownloadUrl(String bucket, String directory, String fileName) throws Exception {
        // 创建OSSClient实例。
        OSSClient ossClient = new OSSClient(
                OssUniversalConfig.getInstance().getEndPoint(),
                OssUniversalConfig.getInstance().getAccessKeyId(),
                OssUniversalConfig.getInstance().getRealAccessKeySecret());

        Calendar calendar = Calendar.getInstance();
        calendar.add(Calendar.MINUTE, 1);
        Date expiration = calendar.getTime();
        String key = StableUtils.pathJoin(directory, fileName);
        GeneratePresignedUrlRequest request = new GeneratePresignedUrlRequest(bucket, key, HttpMethod.GET);
        // 设置过期时间。
        request.setExpiration(expiration);
        // 生成签名URL（HTTP GET请求）。
        URL signedUrl = ossClient.generatePresignedUrl(request);
        ossClient.shutdown();
        return signedUrl.toString();
    }
}