import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/**
*
* 文件读写辅助类
*
* @since 2012-03-17
*
*/
public class FileUtils {
/**
* 复制单个文件
*
* @param oldFile
* ：File
* @param newPath
* :String 文件路径
*/
public static void copyFile(File oldFile, String newPath) {Long starttime = System.currentTimeMillis();
InputStream inStream = null;
FileOutputStream fout = null;try {
int bytesum = 0;
int byteread = 0;if (oldFile.exists()) { // 文件存在时
inStream = new FileInputStream(oldFile); // 读入原文件
File file = new File(newPath.substring(0, newPath.lastIndexOf("\\")));
//文件不存在时，建文件
if(!file.exists()) {
file.mkdirs();
}
fout = new FileOutputStream(newPath);byte[] buffer = new byte[1024];
while ((byteread = inStream.read(buffer)) != -1) {
bytesum += byteread; // 字节数 文件大小
fout.write(buffer, 0, byteread);
}fout.flush();
}
} catch (Exception e) {
System.out.println("复制文件【" + oldFile.getAbsolutePath() + "】时出错！");
e.printStackTrace();} finally {
try {
// 关闭输入流
if (inStream != null) {
inStream.close();
}// 关闭输出流
if (fout != null) {
fout.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}Long endtime = System.currentTimeMillis();
System.out.println("复制【" + oldFile.getAbsolutePath() + " 】用时【"
+ (endtime - starttime) + "】毫秒！");
}/**
* 复制单个文件
*
* @param inStream
* ：輸入流
* @param newPath
* :String 文件路径
*/
public static void copyFile(InputStream inStream, String newPath) {FileOutputStream fout = null;
try {
int bytesum = 0;
int byteread = 0;
File file = new File(newPath.substring(0, newPath.lastIndexOf("\\")));
//文件不存在时，建文件
if(!file.exists()) {
file.mkdirs();
}
fout = new FileOutputStream(newPath);byte[] buffer = new byte[1024];
while ((byteread = inStream.read(buffer)) != -1) {
bytesum += byteread; // 字节数 文件大小
fout.write(buffer, 0, byteread);
}fout.flush();
} catch (Exception e) {
e.printStackTrace();} finally {
try {
// 关闭输入流
if (inStream != null) {
inStream.close();
}// 关闭输出流
if (fout != null) {
fout.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}/**
* 复制文件夹
*
* @param oldPath
* ：String 文件路径
* @param newPath
* ：String 文件路径
*/
public static void copyFolder(String oldPath, String newPath) {try {
(new File(newPath)).mkdirs(); // 如果文件夹不存在 则建立新文件夹
File oldfiles = new File(oldPath);
String[] file = oldfiles.list();// 循环时用于存放临时的文件列表
File tempfile = null;// 存放临时文件for (int i = 0; i < file.length; i++) {
// 循环拿到文件夹下的每个文件
if (oldPath.endsWith(File.separator)) {
tempfile = new File(oldPath + file[i]);
} else {
tempfile = new File(oldPath + File.separator + file[i]);
}// 是文件，就直接拷文件
if (tempfile.isFile()) {
copyFile(tempfile, newPath + "/"
+ (tempfile.getName()).toString());
}// 是文件夾，继续循环拷文件夹
if (tempfile.isDirectory()) {
copyFolder(oldPath + "/" + file[i], newPath + "/" + file[i]);
}
}
} catch (Exception e) {
System.out.println("复制文件夹【" + oldPath + "】时出错！");
e.printStackTrace();}
}
/**
* 下载项目里面的文件
*
* @param request
* @param response
*/
public static void doDownFile(HttpServletRequest request,
HttpServletResponse response, String filePath, String fileRealName) {
InputStream ins = null;
ServletOutputStream toClient = null;
File file = null;// 从页面读取文件路径
if (filePath != null) {
try {
file = new File(request.getRealPath("/") + filePath);
if (file.exists()) {
ins = new FileInputStream(file);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
System.out.println("文件不存在！");
}response.reset();
// 得到保存的文件名
String filename = null;
try {
/*filename = new String(filePath.substring(
filePath.lastIndexOf("\\") + 1).getBytes("GBK"),
"ISO-8859-1");*/
filename = new String(fileRealName.getBytes("GBK"),"ISO-8859-1");
response.setHeader("Content-disposition",
"attachment;filename=" + filename);response.setContentType("application/x-msdownload");
response.setContentType("application/octet-stream;charset=GBK");
// 解决在弹出文件下载框不能打开文件的问题
response.addHeader("Content-Disposition",
"attachment; filename="
+ URLEncoder.encode(filename, "GBK"));} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
System.out.println("文件名转码时出错！");
}BufferedInputStream bis = new BufferedInputStream(ins);
try {
// 得到客户端输出流
toClient = response.getOutputStream();byte[] b = new byte[8192];
int len = 0;while ((len = bis.read(b)) != -1) {
// 向客户端写文件
toClient.write(b, 0, len);
}
} catch (IOException e) {
e.printStackTrace();
System.out.println("文件读取时出错！");
} finally {
// 关闭流
try {
if (bis != null) {
bis.close();
}
if (ins != null) {
ins.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
/**
* 删除文件夹辅助方法
*
* @param filePath
* @return
*/
public static void deleteFile(String filePath) {
// boolean flag = false;
File file = new File(filePath);
// 判断目录或文件是否存在
if (!file.exists()) { // 不存在返回 false
// return flag;
} else {
// 判断是否为文件
if (file.isFile()) { // 为文件时调用删除文件方法
file.delete();
} else { // 为目录时调用删除目录方法
File[] files = file.listFiles();
for (int i = 0; i < files.length; i++) {
// 刪除子文件夾
deleteFile(files[i].getAbsolutePath());
}
}
}
}
}
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