使用OReilly的cos实现多文件上传多文件

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import com.oreilly.servlet.MultipartRequest;
import com.oreilly.servlet.multipart.FileRenamePolicy;

/**
* 使用O'Reilly的cos实现多文件上传
*/
public class CosFileUpload {

private HttpServletRequest request;

private String CharSet = "utf-8";

public void setRequest(HttpServletRequest request) {
this.request = request;
}

public void setCharSet(String charSet) {
CharSet = charSet;
}

public CosFileUpload(HttpServletRequest request, String charSet) {
super();
this.request = request;
CharSet = charSet;
}

public CosFileUpload(HttpServletRequest request) {
super();
this.request = request;
}

/**
* 文件上传，返回上传成功后文件目录列表（不包含路径）
*
* @param savepath
* @param fileCount
* @param maxFileSize
* @return
* @throws Exception
*/
@SuppressWarnings("unchecked")
public List<String> filesUpload(String savepath, int fileCount, int maxFileSize) throws Exception {
List<String> fileList = new ArrayList<String>();
try {
File file = new File(savepath);
if (!file.exists()) {
file.mkdirs();
}
int maxPostSize = fileCount * maxFileSize * 1024 * 1024;

FileRenamePolicy rename = new MyFileRenamePolicy();

MultipartRequest multi = new MultipartRequest(this.request, savepath, maxPostSize, this.CharSet, rename);
Enumeration files = multi.getFileNames();
while (files.hasMoreElements()) {
String name = (String) files.nextElement();
File f = multi.getFile(name);
if (f != null) {
String fileName = multi.getFilesystemName(name);
fileList.add(fileName);
}
}
} catch (Exception e) {
throw e;
}
return fileList;
}

// 命名规则，防止重名
class MyFileRenamePolicy implements FileRenamePolicy {
public File rename(File file) {
String newName = addInNameExt(file.getName(), getDateStr());
File result = new File(file.getParentFile(), newName);

return result;
}

// 返回一个当前时间的字符串表示
private String getDateStr() {
String pattern = "yyyyMMddHHmmssSSS";
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
String dateStr = sdf.format(new java.util.Date());

return dateStr;
}

// 分离完整文件名的文件名和后缀,并在中间加入字符串后返回
private String addInNameExt(String fullName, String add) {
String name = "";// 文件名
String ext = ""; // 后缀
char point = '.';
int index = fullName.lastIndexOf(point);

if (index != -1) {// 如果有后缀
name = fullName.substring(0, index);
ext = fullName.substring(index + 1);
} else {
name = fullName;
}

return name + "_" + add + point + ext;
}
}
}