?? 1。新建目錄

<%@ page contentType="text/html;charset=gb2312"%>
<%
String filePath="c:/aaa/";
filePath=filePath.toString();//中文轉換
java.io.File myFilePath=new java.io.File(filePath);
if(!myFilePath.exists())
myFilePath.mkdir();
%>

? 2。新建文件

<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.io.*" %>
<%
String filePath="c:/哈哈.txt";
filePath=filePath.toString();
File myFilePath=new File(filePath);
if(!myFilePath.exists())
myFilePath.createNewFile();
FileWriter resultFile=new FileWriter(myFilePath);
PrintWriter myFile=new PrintWriter(resultFile);
String strContent = "中文測試".toString();
myFile.println(strContent);
resultFile.close();
%>

?3。刪除文件

<%@ page contentType="text/html;charset=gb2312"%>
<%
String filePath="c:/支出證明單.xls";
filePath=filePath.toString();
java.io.File myDelFile=new java.io.File(filePath);
myDelFile.delete();
%>

?4。文件拷貝

<%@ page contentType="text/html; charset=gb2312" %>
<%@ page import="java.io.*" %>
<%
int bytesum=0;
int byteread=0;?
file://讀到流中
InputStream inStream=new FileInputStream("c:/aaa.doc");
FileOutputStream fs=new FileOutputStream( "d:/aaa.doc"); byte[]? buffer =new? byte[1444];
int length;
while ((byteread=inStream.read(buffer))!=-1)
?{
???out.println("<DT><B>"+byteread+"</B></DT>");
???bytesum+=byteread;
???System.out.println(bytesum);
???fs.write(buffer,0,byteread);
?}?
inStream.close();
%>

?5。整個文件夾拷貝

<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.io.*" %>
<%String url1="C:/aaa";
? String url2="d:/java/";
? (new File(url2)).mkdirs();
?File[] file=(new File(url1)).listFiles();
?for(int i=0;i<file.length;i++){
? if(file[i].isFile()){
?? file[i].toString();
?? FileInputStream input=new FileInputStream(file[i]);
?? FileOutputStream output=new FileOutputStream(url2+"/"+(file[i].getName()).toString());
?? byte[] b=new byte[1024*5];
??? int len;
??? while((len=input.read(b))!=-1){
??? output.write(b,0,len);
??? }
??? output.flush();
??? output.close();
??? input.close();
? }
?}
%>

?6。文件下載

<%@ page contentType="text/html; charset=gb2312" %>
<%@ page import="java.io.*" %>
<%
? String fileName = "zsc104.swf".toString();
//讀到流中
InputStream inStream=new FileInputStream("c:/zsc104.swf");
//設置輸出的格式
? response.reset();
? response.setContentType("bin");
? response.addHeader("Content-Disposition","attachment; filename=\"" + fileName + "\"");
//循環取出流中的數據
? byte[] b = new byte[100];
? int len;
? while((len=inStream.read(b)) >0)
? response.getOutputStream().write(b,0,len); ?
? inStream.close();
%>

?7。數據庫字段中的文件下載

<%@ page contentType="text/html; charset=gb2312" %>
<%@ page import="java.sql.*"%>
<%@ page import="java.lang.*" %>
<%@ page import="java.io.*" %>
<%@ page import="com.jspsmart.upload.*" %>
<%@ page import="DBstep.iDBManager2000.*"%>
<%
int bytesum=0;
int byteread=0;
//打開數據庫
ResultSet result=null;
String Sql=null;
PreparedStatement prestmt=null;?
DBstep.iDBManager2000 DbaObj=new DBstep.iDBManager2000();
DbaObj.OpenConnection();
//取得數據庫中的數據
Sql="select? *? from? t_local_zhongzhuan ";
result=DbaObj.ExecuteQuery(Sql);
result.next();

file://將數據庫中的數據讀到流中
InputStream inStream=result.getBinaryStream("content");
FileOutputStream fs=new FileOutputStream( "c:/dffdsafd.doc");

byte[]? buffer =new? byte[1444];
int length;
while ((byteread=inStream.read(buffer))!=-1)
??{
?????out.println("<DT><B>"+byteread+"</B></DT>");
?????bytesum+=byteread;
?????System.out.println(bytesum);
???? fs.write(buffer,0,byteread);
???? }
%>

?8。把網頁保存成文件

<%@ page import="java.text.*"%>
<%@ page import="java.util.*"%>
<%@ page import="java.io.*"%>
<%@ page import="java.net.*"%>
<%
?URL stdURL = null;
?BufferedReader stdIn = null;
?PrintWriter stdOut = null;
?try {
??stdURL = new URL("http://www.163.com");
?}
?catch (MalformedURLException e) {
?? throw e;
?}

try {
?? stdIn = new BufferedReader(new InputStreamReader(stdURL.openStream()));
?? stdOut = new PrintWriter(new BufferedWriter(new FileWriter("c:/163.html")));
?}
?catch (IOException e) {
?}

?/***把URL指定的頁面以流的形式讀出，寫成指定的文件***/
?try {
?? String strHtml = "";
?? while((strHtml = stdIn.readLine())!=null) {
???stdOut.println(strHtml);
?? }
?}
?catch (IOException e) {
?? throw e;
?}
?finally {
?? try {
???? if(stdIn != null)
?????? stdIn.close();
???? if(stdOut != null)
?????? stdOut.close();
?? }
?? catch (Exception e) {
???? System.out.println(e);
?? }
?}
%>

?9。直接下載網上的文件

<%@ page import="java.io.*"%>
<%@ page import="java.net.*"%>
<%
int bytesum=0;
int byteread=0;

URL url = new URL("http://pimg.163.com/sms/micheal/logo.gif");
?URLConnection conn = url.openConnection();
?InputStream inStream = conn.getInputStream();
?FileOutputStream fs=new FileOutputStream( "c:/abc.gif");

? byte[]? buffer =new? byte[1444];
?? int length;
??? while ((byteread=inStream.read(buffer))!=-1)
??? {
?????? out.println("<DT><B>"+byteread+"</B></DT>");
?????? bytesum+=byteread;
?????? System.out.println(bytesum);
?????? fs.write(buffer,0,byteread);
???? }
%>

? 這些是我積累的一些java中對文件的操作，希望對大家有點啟發。