标签：文件下载
直接修改文件路径就可以，其他都不需要修改，帮助类已经为大家写好，可直接使用
1、Scroller:
/**
* 下载文件
* @author liupeng
* @param request
* @param response
* @return
* @throws Exception
*/
@RequestMapping(value="/testFileDown")
public String testFileDown(HttpServletRequest request,HttpServletResponse response)throws Exception{
FileOperator.FileDownload("e:"+File.separator+"tt.pdf", response);
return null;
}package com.utcsoft.common.util;
import java.io.BufferedInputStream;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.URLEncoder;
import java.util.Properties;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import com.utcsoft.common.servlet.Log4jInitServlet;
public class FileOperator {
private final static Log logger = LogFactory.getLog(FileOperator.class);
public static String path = "c:";
public static int count = 0;
public FileOperator(){
String tmp = getClass().getResource("/").getPath();
System.out.println(tmp);
}
public static String getRootPath(){
try{
String proName = Log4jInitServlet.propertiesPath;
String tmp = System.getProperty("user.dir");
path = tmp.substring(0, tmp.lastIndexOf(File.separator) + 1) + "bid" + File.separator;
/*String osName = System.getProperties().getProperty("os.name");
if (osName.toLowerCase().indexOf("windows") == -1)
{
path = "/home/bid/";
}*/
InputStream in = new BufferedInputStream(new FileInputStream(proName));
Properties p = new Properties();
p.load(in);
//p.containsKey("path.file")
if(!p.getProperty("path.file").toString().trim().equals("")){
path = p.getProperty("path.file");
}
}
catch(Exception ex){
logger.error("[FileOperator] - 获取文件存放路径出现异常 - " + ex.getMessage());
}
return path;
}
//传送文件流到服务端
public static void FileUpload(String filePath, HttpServletRequest request)throws ServletException, IOException{
OutputStream out = null;
InputStream ins = null;
try {
ins = request.getInputStream();
out = new FileOutputStream(filePath);
byte[] fileData = new byte[1024];
int readCount = 0 ;
count = 0;
while((readCount=ins.read(fileData,0,1024)) != -1){
out.write(fileData,0,readCount);
count += readCount;
}
out.flush();
logger.info("[FileUpload] - read file size:"+count + "=======" + request.getClass() + ":" + filePath);
}catch(Exception ex){
ex.printStackTrace();
logger.error("[FileUpload] - " + ex + "=======" + request.getClass());
}finally {
out.close();
ins.close();
}
}
//传送文件流到服务端
public static String loadString(String path) throws IOException
{
StringBuffer buf = new StringBuffer();
String line = null;
java.io.File file = new java.io.File(path);
java.io.InputStream in = null;
java.io.OutputStream out = null;
java.io.BufferedReader reader = null;
try
{
//获取fileInputStream流;
in = new java.io.FileInputStream(file);
//获取bufferedReader流;
reader = new java.io.BufferedReader(new java.io.InputStreamReader(
in));
//循环读取行,如果读取的行为null时，则退出循环;
while ((line = reader.readLine()) != null)
{
buf.append(line).append("\n");
}
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException ex)
{
ex.printStackTrace();
}
finally
{
reader.close();
in.close();
}
return buf.toString();
}
//在线保存并写文件
public static void ReadFile(String path1, String path2) throws IOException {
OutputStream out = new FileOutputStream(path2);
try {
// 创建文件流对象
FileInputStream is = new FileInputStream(path1);
// 设定读取的字节数
int n = 512;
byte buffer[] = new byte[n];
int readCount = 0 ;
count = 0;
// 读取输入流
while ((readCount=is.read(buffer, 0, n) )!= -1) {
out.write(buffer,0,readCount);
count += readCount;
}
out.flush();
// 关闭输入流
out.close();
is.close();
}
catch (IOException ioe) {
}
}
//传送文件流到客户端
public static void FileDownload(String filePath, HttpServletResponse response)throws ServletException, IOException{
if("".equals(filePath))
return;
OutputStream out = null;
InputStream ins = null;
try {
String fileName = StringOperator.GetFileName(filePath);
File file = new File(filePath);
long fileLength = file.length();
ins = new FileInputStream(filePath);
out = response.getOutputStream();
byte[] fileData = new byte[1024];
int readCount = 0 ;
count = 0;
//response.setHeader("Content-Type", "application/octet-stream");
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition", "attachment; filename="+URLEncoder.encode(fileName,"UTF-8"));
response.setHeader("Content-Length", String.valueOf(fileLength));
while((readCount=ins.read(fileData,0,1024)) != -1){
out.write(fileData,0,readCount);
count += readCount;
}
out.flush();
response.flushBuffer();
logger.info("[FileDownload] - write file size:"+count + "=======" + response.getClass() + ":" + filePath);
}catch(Exception ex){
ex.printStackTrace();
logger.error("[FileDownload] -" + ex+ "=======" + response.getClass());
}
finally {
out.close();
ins.close();
}
//PrintWriter out1 = response.getWriter();
//out.clear();
//out = pageContext.pushBody();
}
//文件上传--测试通过
public static boolean FileUploadEx(String filePath, String fileName, long fileSize, InputStream inputStream){
boolean flag = false;
try{
//filePath = StringOperator.GetEncodeString(filePath);
//fileName = StringOperator.GetEncodeString(fileName);
logger.info("[FileUploadEx] - filePath="+filePath+" fileName="+fileName);
InputStream in = inputStream;
File filed = new File(filePath);
if (!filed.exists()) {
filed.mkdirs();
}
byte[] buffer = new byte[4096];
File outFile = new File(filePath + File.separator + fileName);
FileOutputStream bos = null;
bos = new java.io.FileOutputStream(outFile);
int read;
long yx = 0;
while ((read = in.read(buffer)) != -1) {
yx = yx + read;
bos.write(buffer, 0, read);
}
in.close();
bos.flush();
bos.close();
logger.info("[FileUploadEx] - file size:{" + fileSize + "}, read:{" + yx + "}");
flag = true;
}catch(Exception ex){
logger.error(ex);
}
return flag;
}
public static void writefile(String filepath) {
File file = new File(path); //要写入的文件
BufferedWriter writer = null;
try {
if (!file.exists())
file.createNewFile();
writer = new BufferedWriter(new FileWriter(file));
writer.write("111111111111111111111");
} catch (IOException e) {
e.printStackTrace();
} finally {
if (writer != null)
try {
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 根据路径删除指定的目录或文件，无论存在与否
*@param sPath 要删除的目录或文件
*@return 删除成功返回 true，否则返回 false。
*/
public static boolean DeleteFolder(String sPath) {
boolean flag = false;
File file = new File(sPath);
// 判断目录或文件是否存在
if (!file.exists()) { // 不存在返回 false
return flag;
} else {
return deleteDirectory(sPath);
}
}
/**
* 删除单个文件
* @param sPath 被删除文件的文件名
* @return 单个文件删除成功返回true，否则返回false
*/
public static boolean deleteFile(String sPath) {
boolean flag = false;
File file = new File(sPath);
// 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;
}
/**
* 删除目录（文件夹）以及目录下的文件
* @param sPath 被删除目录的文件路径
* @return 目录删除成功返回true，否则返回false
*/
public static boolean deleteDirectory(String sPath) {
//如果sPath不以文件分隔符结尾，自动添加文件分隔符
if (!sPath.endsWith(File.separator)) {
sPath = sPath + File.separator;
}
File dirFile = new File(sPath);
//如果dir对应的文件不存在，或者不是一个目录，则退出
if (!dirFile.exists() || !dirFile.isDirectory()) {
return false;
}
boolean flag = true;
//删除文件夹下的所有文件(包括子目录)
File[] files = dirFile.listFiles();
for (int i = 0; i < files.length; i++) {
//删除子文件
if (files[i].isFile()) {
flag = deleteFile(files[i].getAbsolutePath());
if (!flag) break;
} //删除子目录
else {
flag = deleteDirectory(files[i].getAbsolutePath());
if (!flag) break;
}
}
if (!flag) return false;
//删除当前目录
if (dirFile.delete()) {
return true;
} else {
return false;
}
}
public static void main(String[] args) {
path = "F:\\test";
boolean result = FileOperator.DeleteFolder(path);
System.out.println(result);
}
//可以先将选择的所有的文件生成一个zip文件，然后再下载，该zip文件，即可实现批量下载
public static void ZipOutputStreamDemo(String zipsPath,String sourcefile) throws Exception {
byte[] buffer = new byte[1024];
//生成的ZIP文件名为Demo.zip
String strZipName = "C:Demo.zip";
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(strZipName));
//需要同时下载的两个文件result.txt ，source.txt
File[] file1 = { new File("C:\\test.pdf"),new File("C:\\test11.pdf")};
for(int i=0;i<file1.length;i++) {
FileInputStream fis = new FileInputStream(file1[i]);
out.putNextEntry(new ZipEntry(file1[i].getName()));
int len;
//读入需要下载的文件的内容，打包到zip文件
while((len = fis.read(buffer))>0) {
out.write(buffer,0,len);
}
out.closeEntry();
fis.close();
}
out.close();
System.out.println("生成Demo.zip成功");
}
}
标签：文件下载
原文地址：http://blog.csdn.net/liupeng_family/article/details/40589945
