版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/aodeng110/article/details/82882644
版权声明
版权声明：本文由 低调小熊猫 发表于 低调小熊猫的博客
转载声明：自由转载-非商用-非衍生-保持署名，非商业转载请注明作者及出处，商业转载请联系作者本人qq:2696284032
文章链接：https://aodeng.cc/archives/javaosszipdown
简介
阿里oss对象存储官方文档我看了，但是真实开发，还不能满足需求，阿里文件下载路径只能写死，下载文件也只能单个下载,所以自己整理了一些代码，下载时可以自己选择保存的路径，可以实现多个文件同时下载，不吹逼了，反正很厉害就是了，话不多说，上代码
代码
1.自己封装的工具包的代码
https://aodeng.cc/archives/ossutil
2.页面发送请求的代码
<td>
<a class="btn btn-mini btn-danger" style="width: 88px;height:30px;margin-top: -25px"
href="${pageContext.request.contextPath}/pproject/ossdownfile?projectId=${projectId}">
下载
</a>
</td>
3.功能实现的代码
/**
* oss文件下载
*/
@RequestMapping("/ossdownfile")
public void ossdownfile(HttpServletRequest request,HttpServletResponse response,@RequestParam(value="projectId",required=false) long projectId) throws Exception{
try {
//-----------------------低调小熊猫批量下载文件------------------------//
//获取文件名称
String Name=pprojectService.findOne(projectId).getCheckFileName();
//模拟文件
String fileName = request.getSession().getServletContext().getRealPath("tmp/check/")+"/"+projectId+"/"+Name;
// 创建临时文件
File zipFile = File.createTempFile("temp", ".zip");
FileOutputStream fps = new FileOutputStream(zipFile);
CheckedOutputStream csum = new CheckedOutputStream(fps, new Adler32());//注释一下Adler32（较快）和CRC32两种
// 用于将数据压缩成Zip文件格式
ZipOutputStream zos = new ZipOutputStream(csum);
//获取文件的name并拼接成key，下载文件
File f = new File(PathUtil.getRealPath()+"\\tmp\\files\\"+projectId);
if(f.exists()){
File[] fs = f.listFiles();
if(null!=fs){
for(File file0:fs){
//善意的提醒一下，key不能以任何形式的斜杠开头
InputStream inputStream = ossUtil.getObjectForInputStream("files/"+projectId+"/"+file0.getName()).getObjectContent();
zos.putNextEntry(new ZipEntry(file0.getName()));//确保压缩包里面文件不同名
int bytesRead = 0;
// 向压缩文件中输出数据
while((bytesRead=inputStream.read())!=-1){
zos.write(bytesRead);
}
inputStream.close();
zos.closeEntry();
}
}
}
zos.close();
//转码，免得文件名中文乱码
Name = URLEncoder.encode(Name,"UTF-8");
//设置文件下载头
response.addHeader("Content-Disposition", "attachment;filename=" + Name);
//1.设置文件ContentType类型，这样设置，会自动判断下载文件类型
response.setContentType("application/octet-stream");
//写入文件
FileInputStream fis = new FileInputStream(zipFile);
BufferedInputStream buff = new BufferedInputStream(fis);
BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
//通知浏览器以附件形式下载
response.setHeader("Content-Disposition","attachment;filename="+URLEncoder.encode(Name,"utf-8"));
byte[] car=new byte[1024];
int L=0;
while (L < zipFile.length()) {
int j = buff.read(car, 0, 1024);
L += j;
out.write(car, 0, j);
}
if(out!=null){
out.flush();
out.close();
}
ossUtil.clientShutdown();
// 删除文件
zipFile.delete();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
善意的提示
出现这个bug的时候，其实就是连接池关闭的错误：
com.aliyun.oss.common.comm.ServiceClient Unable to execute HTTP request: Connection pool shut down
这句代码记得注释掉
client.shutdown();
创建的ossclient一旦关闭，就不可以继续使用。另外，多个ossclient实例之间是没有影响的，关闭任意一个，其余的实例不受影响。使用多线程的方式可以同时开启多个连接池，这样关闭才是没有影响的
下面是两个测试Case，第一个case不断的创建、关闭，测试是OK的，第二个case会出现异常信息。
public void testMuliInstanceClient() throws Exception {
Thread thrd0 = new Thread(new Runnable() {
final String keyPrefix = "thread0-";
@Override
public void run() {
for (int i = 0; i < 100; i++) {
OSSClient client0 = new OSSClient(SECOND_ENDPOINT, SECOND_ACCESS_ID, SECOND_ACCESS_KEY);
InputStream content = TestUtils.genFixedLengthInputStream(128 * 1024);
String key = TestUtils.buildObjectKey(keyPrefix, i);
try {
PutObjectResult result = client0.putObject(bucketName, key, content, null);
System.out.println(key + ": " + result.getETag());
} catch (Exception e) {
e.printStackTrace();
} finally {
if (client0 != null) {
System.out.println("shutdown");
client0.shutdown();
}
}
}
}
});
Thread thrd1 = new Thread(new Runnable() {
final String keyPrefix = "thread1-";
@Override
public void run() {
for (int i = 0; i < 100; i++) {
OSSClient client1 = new OSSClient(SECOND_ENDPOINT, SECOND_ACCESS_ID, SECOND_ACCESS_KEY);
InputStream content = TestUtils.genFixedLengthInputStream(1 * 1024 * 1024);
String key = TestUtils.buildObjectKey(keyPrefix, i);
try {
PutObjectResult result = client1.putObject(bucketName, key, content, null);
System.out.println(key + ": " + result.getETag());
Thread.sleep(50);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (client1 != null) {
System.out.println("shutdown");
client1.shutdown();
}
}
}
}
});
thrd0.start();
thrd1.start();
thrd0.join();
thrd1.join();
}
@Test
public void keepUsingAfterClose() {
OSSClient client = new OSSClient(SECOND_ENDPOINT, SECOND_ACCESS_ID, SECOND_ACCESS_KEY);
InputStream content = TestUtils.genFixedLengthInputStream(128 * 1024);
client.putObject(bucketName, "key0", content, null);
client.shutdown();
content = TestUtils.genFixedLengthInputStream(128 * 1024);
try {
client.putObject(bucketName, "key0", content, null);
} catch (ClientException ce) {
System.out.println(ce.getMessage());
} catch (Exception e) {
System.out.println(e.getMessage());
}
}