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