FileUtils.java
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package com.huaheng.common.utils.file;
import javax.servlet.http.HttpServletRequest;
import java.io.*;
import java.net.URLEncoder;
/**
* 文件处理工具类
*
* @author huaheng
*/
public class FileUtils
{
public static String FILENAME_PATTERN = "[a-zA-Z0-9_\\-\\|\\.\\u4e00-\\u9fa5]+";
/**
* 输出指定文件的byte数组
*
* @param filePath 文件路径
* @param os 输出流
* @return
*/
public static void writeBytes(String filePath, OutputStream os) throws IOException
{
FileInputStream fis = null;
try
{
File file = new File(filePath);
if (!file.exists())
{
throw new FileNotFoundException(filePath);
}
fis = new FileInputStream(file);
byte[] b = new byte[1024];
int length;
while ((length = fis.read(b)) > 0)
{
os.write(b, 0, length);
}
}
catch (IOException e)
{
throw e;
}
finally
{
if (os != null)
{
try
{
os.close();
}
catch (IOException e1)
{
e1.printStackTrace();
}
}
if (fis != null)
{
try
{
fis.close();
}
catch (IOException e1)
{
e1.printStackTrace();
}
}
}
}
/**
* 删除文件
*
* @param filePath 文件
* @return
*/
public static boolean deleteFile(String filePath)
{
boolean flag = false;
File file = new File(filePath);
// 路径为文件且不为空则进行删除
if (file.isFile() && file.exists())
{
file.delete();
flag = true;
}
return flag;
}
/**
* 文件名称验证
*
* @param filename 文件名称
* @return true 正常 false 非法
*/
public static boolean isValidFilename(String filename)
{
return filename.matches(FILENAME_PATTERN);
}
/**
* 下载文件名重新编码
*
* @param request 请求对象
* @param fileName 文件名
* @return 编码后的文件名
*/
public static String setFileDownloadHeader(HttpServletRequest request, String fileName)
throws UnsupportedEncodingException
{
final String agent = request.getHeader("USER-AGENT");
String filename = fileName;
if (agent.contains("MSIE"))
{
// IE浏览器
filename = URLEncoder.encode(filename, "utf-8");
filename = filename.replace("+", " ");
}
else if (agent.contains("Firefox"))
{
// 火狐浏览器
filename = new String(fileName.getBytes(), "ISO8859-1");
}
else if (agent.contains("Chrome"))
{
// google浏览器
filename = URLEncoder.encode(filename, "utf-8");
}
else
{
// 其它浏览器
filename = URLEncoder.encode(filename, "utf-8");
}
return filename;
}
}