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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