求助：JavaScript 读取文件

Question

<object id="fileDialog" width="0px" height="0px" classid="clsid:F9043C85-F6F2-101A-A3C9-08002B2F49FB" codebase="http://activex.microsoft.com/controls/vb5/comdlg32.cab">
</object>
<textarea id=TxtBody style="background-color:#EEEEEE;width:100%;height:100">无标题</textarea>
<br>
<input type=button value=加载 onclick="loadDoc()">
<input type=button value=保存 onclick="saveDoc()">
<script>
function loadDoc()
{
fileDialog.CancelError=true;
    try{
    fileDialog.Filter="HTM Files (*.htm)|*.htm|Text Files (*.txt)|*.txt";
     fileDialog.ShowOpen();
    var fso=new ActiveXObject("Scripting.FileSystemObject");
    var reading=1;
    var f=fso.OpenTextFile(fileDialog.filename,reading);
    //window.confirm(f);
    var r=f.ReadAll();
    f.close();
    TxtBody.value=r;
    }catch(e){}
}
function saveDoc()
{
fileDialog.CancelError=true;
   try{
   fileDialog.Filter="HTM Files (*.htm)|*.htm|Text Files (*.txt)|*.txt";
   fileDialog.ShowSave();
   var fso=new ActiveXObject("Scripting.FileSystemObject");
   var f=fso.CreateTextFile(fileDialog.filename,true);
   f.write(TxtBody.value);
   f.Close();
   }
   catch(e){}
}
</script>
</body>

Answer 1

如果客户端为Unix可以用Applet来代替ActiveX组件
package Excel;import java.io.*;
import java.awt.*;
import java.net.*;
import javax.swing.*;
import java.applet.*;
public class Excel extends Applet
{
LayoutManager DC_Layout;
TextField m_FileName;
TextField m_Directory;
Button m_Action_Open;
Button m_Action_Save;
Frame m_Frame=new Frame();
public void init()
{
//运行程序开始
Runtime runTime=Runtime.getRuntime();
Process process;
try
{
process=runTime.exec("notepad");
/*
InputStreamReader inputStreamReader=new InputStreamReader(process.getInputStream());
LineNumberReader input=new LineNumberReader(inputStreamReader);
String strLine;
while((strLine=input.readLine())!=null)
{
JOptionPane.showMessageDialog(this,strLine);
}
*/
}
catch(Exception e)
{
JOptionPane.showMessageDialog(this,e.getMessage());
}
finally
{
//JOptionPane.showMessageDialog(this,"Finally...");
}
//运行程序结束
String strURL=getParameter("ExcelURL");
//
AudioClip audioClip=getAudioClip(getCodeBase(),strURL);
audioClip.play();
audioClip.stop();
audioClip.loop();
//
//play(getCodeBase(),strURL);
//
setBackground(Color.white);
DC_Layout=new FlowLayout(FlowLayout.LEFT,10,5);
setLayout(DC_Layout);
m_FileName=new TextField(20);
add(m_FileName);
m_Directory=new TextField(20);
add(m_Directory);
m_Action_Open=new Button("打开");
add(m_Action_Open);
m_Action_Save=new Button("另存");
add(m_Action_Save);
CreateLocalFile("C:\\Temp.txt");
ReadURL(strURL);
}
public boolean action(Event e,Object arg)
{
if(e.target instanceof Button)
{
if("打开".equals(e.arg))
{
FileDialog fileDialog=new FileDialog(m_Frame,"打开什么文件?");
fileDialog.setFile("*.doc");
fileDialog.setDirectory(".");
fileDialog.show();
String strOpenFile;
if((strOpenFile=fileDialog.getFile())!=null)
{
m_FileName.setText(strOpenFile);
m_Directory.setText(fileDialog.getDirectory());
try
{
this.getAppletContext().showDocument(new java.net.URL("javascript:window.open('','','channelmode');"));
}
catch(Exception error)
{}
       }
else
{
        m_FileName.setText("取消");
m_Directory.setText("");
}
return true;
}
if("另存".equals(e.arg))
{
FileDialog fileDialog=new FileDialog(m_Frame,"另存什么文件?");
fileDialog.setFile("*.doc");
fileDialog.setDirectory(".");
fileDialog.show();
String strSaveFile;
if((strSaveFile=fileDialog.getFile())!=null)
{
m_FileName.setText(strSaveFile);
m_Directory.setText(fileDialog.getDirectory());
       }
else
{
        m_FileName.setText("取消");
m_Directory.setText("");
}
return true;
}
}
return false;
}
public void CreateLocalFile(String strFileName)
{
File m_File=new File(strFileName);
try
{
m_File.createNewFile();
JOptionPane.showMessageDialog(this,"成功创建本地文件...");
}
catch(Exception error)
{
JOptionPane.showMessageDialog(this,error.getMessage());
}
}
public void ReadURL(String strURL)
{
try
{
int iHttpResult;
URL m_URL=new URL(strURL);
URLConnection m_URLConn=m_URL.openConnection();
m_URLConn.connect();
HttpURLConnection m_HttpConn=(HttpURLConnection)m_URLConn;
iHttpResult=m_HttpConn.getResponseCode();
if(iHttpResult!=HttpURLConnection.HTTP_OK)
JOptionPane.showMessageDialog(this,"无法连接...");
else
{
int iFileSize=m_URLConn.getContentLength();
InputStreamReader m_Reader=new InputStreamReader(m_URLConn.getInputStream());
char[] Buffer=new char[2048];
int iNum=0;
while(iNum>-1)
{
iNum=m_Reader.read(Buffer);
if(iNum<0)break;
//JOptionPane.showMessageDialog(this,new String(Buffer,0,iNum));
}
m_Reader.close();
}
}
catch(Exception e)
{
JOptionPane.showMessageDialog(this,e.getMessage());
}
}
}

Answer 2

浏览器一般会支持Applet的,客户端只有这两中方式ActiveX和Applet.

Answer 3

一行一行地读取数据是可以的.但是在LINUX下我就不知道了.
UP

Answer 4

http://www.javascripter.net/faq/fileacce.htm#top
这篇文章说的很详细，还有在线的源码！