<%
...
@ (tng)page (tng)language
=
"
java
"
(tng)contentType
=
"
text/html; (tng)charset=GB18030
"
(tng) (tng) (tng) (tng)pageEncoding
=
"
GB18030
"
%>
<!
DOCTYPE (tng)html (tng)PUBLIC (tng)"-//W3C//DTD (tng)HTML (tng)4.01 (tng)Transitional//EN" (tng)"http://www.w3.org/TR/html4/loose.dtd"
>
<
html
>
<
head
>
<
meta (tng)
http-equiv
="Content-Type"
(tng)content
="text/html; (tng)charset=GB18030"
>
<
title
>
Insert (tng)title (tng)here
</
title
>
</
head
>
<
body
>
<
a (tng)
href
="/test/test.do"
>
1322
</
a
>
</
body
>
</
html
>
(tng)action:
package
(tng)action;
import
(tng)java.io.FileOutputStream;
import
(tng)javax.servlet.http.HttpServletRequest;
import
(tng)javax.servlet.http.HttpServletResponse;
import
(tng)org.apache.struts.action.Action;
import
(tng)org.apache.struts.action.ActionForm;
import
(tng)org.apache.struts.action.ActionForward;
import
(tng)org.apache.struts.action.ActionMapping;
public
(tng)
class
(tng)TeAction (tng)
extends
(tng)Action (tng)
...
{
(tng) (tng) (tng) (tng)
public
(tng)ActionForward (tng)execute(ActionMapping (tng)mapping, (tng)ActionForm (tng)form,
(tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng)HttpServletRequest (tng)request, (tng)HttpServletResponse (tng)response) (tng)
throws
(tng)Exception (tng)
...
{ (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng)
//
(tng)TODO (tng)Auto-generated (tng)method (tng)stub
(tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng)StringBuilder (tng)sb (tng)
=
(tng)
new
(tng)StringBuilder(); (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng)sb.append(
"
1
"
); (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng)response.addHeader(
"
Content-Disposition
"
, (tng)
"
attachment; (tng)filename=test.txt
"
); (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng)response.setContentType(
"
application/octet-stream
"
); (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng)response.setCharacterEncoding(
"
GB2312
"
); (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng)response.getWriter().write(sb.toString()); (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng)response.flushBuffer(); (tng) (tng) (tng) (tng) (tng) (tng) (tng) (tng)
return
(tng)
null
;
(tng) (tng) (tng) (tng)}
}
]]>
| <%@ (tng)page (tng)contentType="text/html;charset=gb2312"%> <%@ (tng)page (tng)import="java.io.*"%> <html> <head> <title>文g的徏立、检查与删除</title> </head> <body> <% String (tng)path=request.getRealPath(""); //out.println(path); File (tng)f=new (tng)File(path,"File.txt"); //out.println(f); //out.println(f.exists()); if(f.exists()){//(g)查File.txt是否存在 f.delete();//删除File.txt文g out.println(path (tng)+ (tng)"\\File.txt (tng)存在Q已删除?); }else{ f.createNewFile();//在当前目录下建立一个名为File.txt的文?br />out.println(path (tng)+ (tng)"\\File.txt (tng)不存在，已徏立?);//输出目前所在的目录路径 } %> (tng) |
目录的徏?(g)查与删除
| <%@ (tng)page (tng)contentType="text/html;charset=gb2312"%> <%@ (tng)page (tng)import="java.io.*"%> <html> <head> <title>目录的徏?(g)查与删除</title> </head> <body> <% String (tng)path=request.getRealPath(""); path=path (tng)+ (tng)"\\Sub";//要建立的目录\?br />File (tng)d=new (tng)File(path);//建立代表Sub目录的File对象Qƈ得到它的一个引?br />if(d.exists()){//(g)查Sub目录是否存在 d.delete(); out.println("Sub目录存在Q已删除"); }else{ d.mkdir();//建立Sub目录 out.println("Sub目录不存在，已徏?); } %> </body> </html> (tng) |
如何在JSP中处理虚拟目?/p>
| <%@ (tng)page (tng)contentType="text/html;charset=gb2312"%> <%@ (tng)page (tng)import="java.io.*"%> <html> <head> <title>JSP中如何处理虚拟目?lt;/title> </head> <body> 取得虚拟目录对应的磁盘\?lt;br> Web站点ȝ录的位置?lt;font (tng)color=#ff0000><%=request.getRealPath("/")%></font><br> JSP|页所在的目录位置<font (tng)color=#ff0000><%=request.getRealPath("./")%></font><br> JSP|页所在目录上一层目录的位置<font (tng)color=#ff0000><%=request.getRealPath("../")%></font><br> </body> </html> (tng) |
文g属性的取得
| <%@ (tng)page (tng)contentType="text/html;charset=gb2312"%> <%@ (tng)page (tng)import="java.util.Date,java.io.*"%> <html> <head> <title>文g属性的取得</title> </head> <body> <% String (tng)path=request.getRealPath("/"); File (tng)f=new (tng)File(path,"ReadData.txt"); if(f.exists()){ %> <%=f.getName()%>的属性如下：(x)<br><br> 文g长度为：(x)<%=f.length()%> <%=f.isFile()?"是文?:"不是文g"%><br> <%=f.isDirectory()?"是目?:"不是目录"%><br> <%=f.canRead()?"可读?:"不可d"%><br> <%=f.canWrite()?"可写?:"不可写入"%><br> <%=f.isHidden()?"是隐藏文?:"不是隐藏文g"%><br> 文g的最后修Ҏ(gu)期ؓ(f)Q?lt;%=new (tng)Date(f.lastModified())%><br> <% }else{ f.createNewFile();//在当前目录下建立一个名为ReaData.txt的文?br />%> (tng) <%=f.getName()%>的属性如下：(x)<br><br> 文g长度为：(x)<%=f.length()%> <%=f.isFile()?"是文?:"不是文g"%><br> <%=f.isDirectory()?"是目?:"不是目录"%><br> <%=f.canRead()?"可读?:"不可d"%><br> <%=f.canWrite()?"可写?:"不可写入"%><br> <%=f.isHidden()?"是隐藏文?:"不是隐藏文g"%><br> 文g的最后修Ҏ(gu)期ؓ(f)Q?lt;%=new (tng)Date(f.lastModified())%><br> <% } %> </body> </html> (tng) |
取出目录中文件的Ҏ(gu)
| <%@ (tng)page (tng)contentType="text/html;charset=gb2312"%> <%@ (tng)page (tng)import="java.io.*"%> <html> <head> <title>取出目录中文件的Ҏ(gu)--列出目录中的文g</title> </head> <body> <% String (tng)path=request.getRealPath("/"); File (tng)d=new (tng)File(path);//建立当前目录中文件的File对象 File (tng)list[]=d.listFiles();//取得代表目录中所有文件的File对象数组 out.println("<font (tng)color=#ff0000>" (tng)+ (tng)path (tng)+ (tng)"目录下的文gQ?lt;/font><br>"); for(int (tng)i=0;i<list.length;i++){ if(list<I>.isFile()){ out.println(list<I>.getName() (tng)+ (tng)"<br>"); } } out.println("<br><font (tng)color=#ff0000>" (tng)+ (tng)path (tng)+ (tng)"目录下的目录Q?lt;/font><br>"); for(int (tng)i=0;i<list.length;i++){ if(list<I>.isDirectory()){ out.println(list<I>.getName() (tng)+ (tng)"<br>"); } } %> </body> </html> |
判断是否为空白文?/p>
| <%@ (tng)page (tng)contentType="text/html;charset=gb2312"%> <%@ (tng)page (tng)import="java.io.*"%> <html> <head> <title>判断是否为空白文?lt;/title> </head> <body> <% String (tng)path=request.getRealPath("/"); out.println(path); FileReader (tng)fr=new (tng)FileReader(path (tng)+ (tng)"\\AtEnd.txt");//建立FileReader对象Qƈ实例化ؓ(f)fr //对FileReadercȝ成的对象使用read()Ҏ(gu)Q可以从字符中d下一个字W?br />if(fr.read()==-1)//判断是否已读到文件的l尾 { out.print("AtEnd.txt文g中没有数?lt;br>"); }else{ out.println("AtEnd.txt文g中有数据"); } fr.close(); %> </body> </html> (tng) |
d所有的文g数据
| <%@ (tng)page (tng)contentType="text/html;charset=gb2312"%> <%@ (tng)page (tng)import="java.io.*,java.lang.*"%> <html> <head> <title>d所有的文g数据</title> </head> <body> <% String (tng)path=request.getRealPath("."); FileReader (tng)fr=new (tng)FileReader(path (tng)+ (tng)"\\ReadData.txt"); //关键在于dq程中，要判断所d的字W是否已l到?jin)文件的末尾Qƈ且这个字W是不是文g中的断行W，卛_断该字符值是否ؓ(f)13?br />int (tng)c=fr.read();//从文件中d一个字W?br />//判断是否已读到文件结?br />while(c!=-1){ out.print((char)c);//输出d的数?br />c=fr.read();//从文件中l箋d数据 if(c==13){//判断是否为断行字W?br />out.print("<br>");//输出分行标签 fr.skip(1);//略过一个字W?br />//c=fr.read();//d一个字W?br />} } fr.close(); %> </body> </html> |
一行一行读取数?/p>
| <%@ (tng)page (tng)contentType="text/html;charset=gb2312"%> <%@ (tng)page (tng)import="java.io.*"%> <html> <head> <title>文gd</title> </head> <body> <% String (tng)path=request.getRealPath("");//取得当前目录的\?br />FileReader (tng)fr=new (tng)FileReader(path (tng)+ (tng)"\\file\\inc\\t.txt");//建立FileReader对象Qƈ实例化ؓ(f)fr BufferedReader (tng)br=new (tng)BufferedReader(fr);//建立BufferedReader对象Qƈ实例化ؓ(f)br String (tng)Line=br.readLine();//从文件读取一行字W串 //判断d到的字符串是否不为空 while(Line!=null){ out.println(Line (tng)+ (tng)"<br>");//输出从文件中d的数?br />Line=br.readLine();//从文件中l箋d一行数?br />} br.close();//关闭BufferedReader对象 fr.close();//关闭文g %> </body> </html> (tng) |
略过文g中的字符不读?/p>
| <%@ (tng)page (tng)contentType="text/html;charset=gb2312"%> <%@ (tng)page (tng)import="java.io.*"%> <html> <head> <title>略过字节不读?lt;/title> </head> <body> <% String (tng)path=request.getRealPath("."); FileReader (tng)fr=new (tng)FileReader(path (tng)+ (tng)"\\ReadData.txt"); fr.skip(2);//跌2个字?br />int (tng)c=fr.read();//d一个字?br />while(c!=-1){ out.print((char)c); c=fr.read(); } fr.close(); %> </body> </html> (tng) |
数据写入文?/p>
| <%@ (tng)page (tng)contentType="text/html;charset=gb2312"%> <%@ (tng)page (tng)import="java.io.*"%> <html> <head> <title>数据写入文?lt;/title> </head> <body> <% String (tng)path=request.getRealPath("."); FileWriter (tng)fw=new (tng)FileWriter(path (tng)+ (tng)"\\WriteData.txt");//建立FileWriter对象Qƈ实例化fw //字W串写入文g fw.write("大家好！"); fw.write("本书是《JSP~程技巧?); fw.write("请多多指教！"); fw.write("email:stride@sina.com"); fw.close(); FileReader (tng)fr=new (tng)FileReader(path (tng)+ (tng)"\\WriteData.txt"); BufferedReader (tng)br=new (tng)BufferedReader(fr);//建立BufferedReader对象Qƈ实例化ؓ(f)br String (tng)Line=br.readLine(); //d一行数?br />out.println(Line (tng)+ (tng)"<br>"); br.close();//关闭BufferedReader对象 fr.close(); %> </body> </html> (tng) |
写入文件的数据分行
| <%@ (tng)page (tng)contentType="text/html;charset=gb2312"%> <%@ (tng)page (tng)import="java.io.*"%> <html> <head> <title>写入文件的数据分行</title> </head> <body> <% String (tng)path=request.getRealPath("."); FileWriter (tng)fw=new (tng)FileWriter(path (tng)+ (tng)"\\WriteData.txt"); BufferedWriter (tng)bw=new (tng)BufferedWriter(fw); bw.write("大家好！"); bw.write("本书是《JSP~程技巧》?); bw.newLine();//断行 bw.write("请多多指教！"); bw.newLine();//断行 bw.write("email: (tng)stride@sina.com"); bw.flush();//数据更新至文g fw.close();//关闭文g?br />out.println("写入文g内容为：(x)<br>"); FileReader (tng)fr=new (tng)FileReader(path (tng)+ (tng)"\\WriteData.txt"); BufferedReader (tng)br=new (tng)BufferedReader(fr); String (tng)Line=br.readLine();//d一行数?br />while(Line!=null){ out.println(Line (tng)+ (tng)"<br>"); Line=br.readLine(); } fr.close(); %> </body> </html> |
如何数据追加写入到文g
| <%@ (tng)page (tng)contentType="text/html;charset=gb2312"%> <%@ (tng)page (tng)import="java.io.*"%> <html> <head> <title>写入文件的数据分行</title> </head> <body> <% String (tng)path=request.getRealPath("."); RandomAccessFile (tng)rf=new (tng)RandomAccessFile(path (tng)+ (tng)"\\WriteData.txt","rw");//定义一个类RandomAccessFile的对象，q实例化 rf.seek(rf.length());//指针移动到文g末尾 rf.writeBytes("\nAppend (tng)a (tng)line (tng)to (tng)the (tng)file!"); rf.close();//关闭文g?br />out.println("写入文g内容为：(x)<br>"); FileReader (tng)fr=new (tng)FileReader(path (tng)+ (tng)"\\WriteData.txt"); BufferedReader (tng)br=new (tng)BufferedReader(fr);//d文g的BufferedRead对象 String (tng)Line=br.readLine(); while(Line!=null){ out.println(Line (tng)+ (tng)"<br>"); Line=br.readLine(); } fr.close();//关闭文g %> </body> </html> (tng) |
]]>