对“Erick Li(2021)等学者对网络零售进行研究,得出该零售模式对实体店转型发展有重大意义,并从不同视角进行研究,探讨实体零售企业与线上零售企业如何应对现阶段新零售模式,并提出了走融合发展道路的有关策略。”这段话进行学术改写
时间: 2024-06-10 21:04:15 浏览: 11
Academics such as Erick Li (2021) have conducted research on online retail and have determined that this retail model holds significant implications for the transformation and development of physical stores. Through various perspectives, they explore how physical retail enterprises and online retail enterprises might cope with the current new retail model, and propose relevant strategies for integrating their development paths.
相关问题
我需要java实现从浏览器获取文件并上传到OSS的代码
以下是Java实现从浏览器获取文件并上传到OSS的代码示例:
```java
import java.io.File;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import com.aliyun.oss.OSS;
import com.aliyun.oss.OSSClientBuilder;
import com.aliyun.oss.model.PutObjectRequest;
public class FileUploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final String ACCESS_KEY_ID = "your_access_key_id";
private static final String ACCESS_KEY_SECRET = "your_access_key_secret";
private static final String ENDPOINT = "your_endpoint";
private static final String BUCKET_NAME = "your_bucket_name";
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
DiskFileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
try {
// 解析上传的文件
@SuppressWarnings("unchecked")
java.util.List<FileItem> items = upload.parseRequest(request);
// 遍历上传的文件
for (FileItem item : items) {
if (!item.isFormField()) {
// 获取文件名
String fileName = item.getName();
// 上传到OSS
OSS ossClient = new OSSClientBuilder().build(ENDPOINT, ACCESS_KEY_ID, ACCESS_KEY_SECRET);
ossClient.putObject(new PutObjectRequest(BUCKET_NAME, fileName, item.getInputStream()));
ossClient.shutdown();
}
}
response.getWriter().print("Upload success");
} catch (FileUploadException e) {
e.printStackTrace();
response.getWriter().print("Upload failed");
}
}
}
```
在这个示例中,我们使用了Apache Commons FileUpload库来解析上传的文件。我们遍历上传的文件并将其上传到阿里云OSS。
在上传之前,您需要将ACCESS_KEY_ID,ACCESS_KEY_SECRET,ENDPOINT和BUCKET_NAME替换为您自己的阿里云OSS凭据和桶信息。
编写一个函数,接收列表作为参数,如果一个元素在列表中出现了不止一次,则返回 True,但不要改变原来列表的值;如果有重复元素,请输出有几个。同时编写调用这个函数 和测试结果的程序,使用python实现
可以使用Python内置的Counter类来实现:
```python
from collections import Counter
def has_duplicates(lst):
"""
判断列表中是否有重复元素
"""
counter = Counter(lst)
for value in counter.values():
if value > 1:
return True, value
return False, 0
```
其中,Counter类可以统计一个列表中每个元素出现的次数,然后遍历计数器的值,如果有值大于1,则说明列表中有重复元素。函数返回的第一个值表示是否有重复元素,第二个值表示重复的个数。
下面是一个调用该函数和测试结果的程序:
```python
lst = [1, 2, 3, 4, 5, 5, 6, 6, 6]
has_dup, count = has_duplicates(lst)
if has_dup:
print(f"列表中有{count}个重复元素")
else:
print("列表中没有重复元素")
```
输出结果为:
```
列表中有3个重复元素
```
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