oos 文件下载

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前两篇写到了oos 上传，获取访问链接，那怎么下载呢。有两种方式
第一种使用文档里面的方法下载文件到本地，在读取文件下载给用户。第二种直接通过访问链接进行下载。

第一种下载方式

先写一个工具类将oos 的文件下载到本地具体代码如下

//key  为存储oos  的key  值  filename为下载后存储的路径        public static void downloadFile(String key, String filename)                throws OSSException, ClientException, IOException {              // 初始化OSSClient              OSSClient ossClient = new OSSClient(FilePath.endpoint, FilePath.accessKeyId,                    FilePath.accessKeySecret);            OSSObject object = ossClient.getObject(FilePath.bucketName, key);            // 获取ObjectMeta              ObjectMetadata meta = object.getObjectMetadata();              // 获取Object的输入流              InputStream objectContent = object.getObjectContent();              ObjectMetadata objectData = ossClient.getObject(new GetObjectRequest(FilePath.bucketName, key),                    new File(filename));              // 关闭数据流              objectContent.close();          }

将文件下载到本能后读取文件流下载，代码如下：

    private void downFile(HttpServletResponse response,String Path) {        try {                File file = new File(Path);            if (file.exists()) {                    InputStream ins = new FileInputStream(Path);                BufferedInputStream bins = new BufferedInputStream(ins);// 放到缓冲流里面                    OutputStream outs = response.getOutputStream();// 获取文件输出IO流                    BufferedOutputStream bouts = new BufferedOutputStream(outs);                    response.setContentType("application/x-download");// 设置response内容的类型                    response.setHeader(                            "Content-disposition",                            "attachment;filename="                                    + URLEncoder.encode(Path, "UTF-8"));// 设置头部信息                int bytesRead = 0;                    byte[] buffer = new byte[8192];                    // 开始向网络传输文件流                    while ((bytesRead = bins.read(buffer, 0, 8192)) != -1) {                        bouts.write(buffer, 0, bytesRead);                    }                    bouts.flush();// 这里一定要调用flush()方法                    ins.close();                    bins.close();                    outs.close();                    bouts.close();                } else {                    response.sendRedirect("../error.jsp");                }            } catch (IOException e) {                Log.error("文件下载出错", e);            }        }

写一个js 用来发起下载请求。传送一个key 作为参数key 是什么请参考获取访问链接这篇文章。http://www.haha174.top/article/details/256945

$(".b_down").unbind("click").click(function(){    var form=$("<form>");//定义一个form表单    form.attr("style","display:none");    form.attr("target","");    form.attr("method","post");    form.attr("action","/download/netfile.do");    var fileInput=$("<input>");    fileInput.attr("type","hidden");    fileInput.attr("id","id");//设置属性的名字    fileInput.attr("name","url");//设置属性的名字    fileInput.attr("value","other/dbz_1505399510989.jpg");//设置属性的值    $("body").append(form);//将表单放置在web中    form.append(fileInput);    form.submit();//表单提交})

写一个controller进行测试

import javax.servlet.http.HttpServletResponse;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import com.yuan.boot.util.BatchDownloadAction;@RestController@RequestMapping("/download")public class DownLoadController {    @RequestMapping("/netfile.do")    public void DownLoadNet(String url,HttpServletResponse response) {        new BatchDownloadAction().execute(response,url);    } }

运行项目点击下载按钮出现如下图即成功实现了
这里写图片描述

第二种通过访问链接下载

首先先获取访问链接具体的方法请参考http://www.haha174.top/article/details/256945
之后的到文件的输入流然后向网络传输文件流完成下载具体工具类代码如下：

    //通过链接下载    public void DownLoadLink(HttpServletResponse response, String  key) throws Exception {        String urlStr=new OSSManageUtil().getUrl(key);//(key,path);        System.out.println(urlStr);        if(StringUtils.isNotBlank(urlStr)) {            URL url = new URL(urlStr);            HttpURLConnection conn = (HttpURLConnection)url.openConnection();            //设置超时间为3秒            conn.setConnectTimeout(3*1000);            //防止屏蔽程序抓取而返回403错误            conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");            //得到输入流            InputStream inputStream;            inputStream = conn.getInputStream();           // InputStream ins = new FileInputStream(Path);            BufferedInputStream bins = new BufferedInputStream(inputStream);// 放到缓冲流里面                OutputStream outs = response.getOutputStream();// 获取文件输出IO流                BufferedOutputStream bouts = new BufferedOutputStream(outs);                response.setContentType("application/x-download");// 设置response内容的类型                response.setHeader(                        "Content-disposition",                        "attachment;filename="                                + URLEncoder.encode(key, "UTF-8"));// 设置头部信息            int bytesRead = 0;                byte[] buffer = new byte[8192];                // 开始向网络传输文件流                while ((bytesRead = bins.read(buffer, 0, 8192)) != -1) {                    bouts.write(buffer, 0, bytesRead);                }                bouts.flush();// 这里一定要调用flush()方法                inputStream.close();                bins.close();                outs.close();                bouts.close();            } else {                response.sendRedirect("../error.jsp");            }           //this.downFile(response,path);    }

$(".b_down1").unbind("click").click(function(){    var form=$("<form>");//定义一个form表单    form.attr("style","display:none");    form.attr("target","");    form.attr("method","post");    form.attr("action","/download/netfile.do");    var fileInput=$("<input>");    fileInput.attr("type","hidden");    fileInput.attr("id","id");//设置属性的名字    fileInput.attr("name","url");//设置属性的名字    fileInput.attr("value","other/dbz_1505399510989.jpg");//设置属性的值    $("body").append(form);//将表单放置在web中    form.append(fileInput);    form.submit();//表单提交})

写一个controller进行测试

import javax.servlet.http.HttpServletResponse;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import com.yuan.boot.util.BatchDownloadAction;@RestController@RequestMapping("/download")public class DownLoadController {    @RequestMapping("/netfile.do")    public void DownLoadNet(String url,HttpServletResponse response) {        new BatchDownloadAction().execute(response,url);    }     @RequestMapping("/Linkfile.do")    public void DownLoadLink(String url,HttpServletResponse response) throws Exception {        new BatchDownloadAction().DownLoadLink(response,url);    } }

这里写图片描述
出现此页面即成功
文章地址：http://www.haha174.top/article/details/251731
项目源码 https://github.com/haha174/day

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