fileUtil文件的上传下载

package com.beisun.mbp.util;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
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.OutputStream;
import java.io.UnsupportedEncodingException;
import java.nio.channels.FileChannel;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.util.FileCopyUtils;
import org.springframework.web.multipart.MultipartFile;

public class FileUtil {

/**
* 上传文件
* @param filePath 上传文件目录
* @param fileName 保存的文件名称
* @param file 文件流类
* @param request 请求
* @throws IOException IO异常
*/
public static void updoadFile(String filePath,String fileName, MultipartFile file,
HttpServletRequest request) throws IOException{
//如果文件夹不存在，则创建文件夹
File dirPath = new File(filePath);
if(!dirPath.exists()){
dirPath.mkdir();
}

File uploadFile = new File(dirPath +"/"+ fileName);
FileCopyUtils.copy(file.getBytes(), uploadFile);
}

/**
* 复制文件
* @param localFileName 原文件地址和文件名
* @param tmpFileName 目标文件地址和文件名
* @throws IOException
*/
public static void copyFile(String localFileName,String tmpFilePath,String tmpFileName) throws IOException{
File localFile = new File(localFileName);
File tmpFile = new File(tmpFilePath,tmpFileName);
FileCopyUtils.copy(localFile, tmpFile);
}

/**
* 删除文件
* @param fileName 文件地址和文件名
* @throws IOException
*/
public static void deleteFile(String fileName) throws IOException{
File localFile = new File(fileName);
localFile.delete();
}

/**
* 下载文件，是向页面输出流，不返回流
* @param filePath 文件服务器存储目录
* @param downloadName 下载文件保存的文件名
* @param fileName 服务器存储文件名
* @param request
* @param response
* @throws UnsupportedEncodingException
*/
@SuppressWarnings("static-access")
public static void downloadFile(String filePath,String downloadName,String fileName,HttpServletRequest request,HttpServletResponse response) throws UnsupportedEncodingException{

fileName = new java.net.URLDecoder().decode(fileName, "utf-8");
downloadName = new java.net.URLDecoder().decode(downloadName, "utf-8");
String path = filePath+fileName;

response.setContentType("application/octet-stream;charset=UTF-8");
response.setHeader("Content-Disposition", "attachment;filename=" + new String((downloadName).getBytes("GBK"), "iso8859-1"));
try {
//以流的形式下载文件
InputStream fis = new BufferedInputStream(new FileInputStream(path));
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();

OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
toClient.write(buffer);
toClient.flush();
toClient.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

/**
* 获取文件的is
* @param filePath 文件服务器存储目录
* @param fileName 服务器存储文件名
* @param request
* @param response
* @throws UnsupportedEncodingException
*/
@SuppressWarnings("static-access")
public static InputStream getFileIS(String filePath,String fileName,HttpServletRequest request,HttpServletResponse response) throws UnsupportedEncodingException{

fileName = new java.net.URLDecoder().decode(fileName, "utf-8");
String path = filePath+fileName;
InputStream fis = null;
try {
//以流的形式下载文件
fis = new BufferedInputStream(new FileInputStream(path));
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return fis;
}

/**
* 保存文件
* @param datas 文件数据
* @param pathName 文件路径
*/
public static void saveFile(byte[] datas,String pathName){
File file = new File(pathName);

//寤虹珛杈撳嚭瀛楄妭娴�
FileOutputStream fos;
try {
fos = new FileOutputStream(file);
//鐢‵ileOutputStream 鐨剋rite鏂规硶鍐欏叆瀛楄妭鏁扮粍
fos.write(datas);
//涓轰簡鑺傜渷IO娴佺殑寮�攢锛岄渶瑕佸叧闂�
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 获取文件数据
* @param pathName 文件路径
* @return
*/
public static byte[] getFile(String pathName){
File file = new File(pathName);
byte[] buffer = null;
try {
FileInputStream fis = new FileInputStream(file);
ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);
byte[] b = new byte[1000];
int n;
while ((n = fis.read(b)) != -1) {
bos.write(b, 0, n);
}
fis.close();
bos.close();
buffer = bos.toByteArray();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return buffer;

}

/**
* 计算文件大小文件大小
* @param filePath 文件路径例如：E:\\imgData\\afr\\9211496189393485.jpg
* @return 文件大小 Kb
*/
public static long GetFileSize(String filePath){
long fileSize=0l;
FileChannel fc= null;
try {
File f= new File(filePath);
if (f.exists() && f.isFile()){
FileInputStream fis= new FileInputStream(f);
fc= fis.getChannel();
fileSize=fc.size()/1024;
//logger.info(fileSize);
}else{
//logger.info("file doesn't exist or is not a file");
}
} catch (FileNotFoundException e) {
//logger.error(e);
} catch (IOException e) {
//logger.error(e);
} finally {
if (null!=fc){
try{
fc.close();
}catch(IOException e){
//logger.error(e);
}
}
}

return fileSize;
}

/**
* getImage 根据图片的路径获取图片给前台
* @author sunjianbo
* @time 2016年8月25日上午10:41:37
* @param response
* @param request
* @param filePath
* @throws Exception
*/
//@RequestMapping(value = "/getImage.do", method = RequestMethod.GET)
public void getImage(HttpServletResponse response, HttpServletRequest request,String filePath)
throws Exception {

BufferedOutputStream bos = null;
try {
bos = new BufferedOutputStream(response.getOutputStream());

byte[] data = getFile(filePath);
bos.write(data);
bos.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
if (bos != null)
bos.close();
}
}

}