1.读取文件：
try{
if (wxz!=null){
if(wxz.equals("C")) wxz = "c:\\";
if(wxz.equals("D")) wxz = "d:\\";
if(wxz.equals("E")) wxz = "e:\\";
if(wxz.equals("F")) wxz = "f:\\";
File dir=new File(wxz);
if (dir.getParent()!=null){
out.println("<img src='images/dfloder.gif'><a href='filelist.jsp?dir="+dir.getParent()+"'>..</a><br>");
}
String temp[]=dir.list();
for(int i=0;i<temp.length;i++){
File ft=new File(temp[i]);
String wxz1=wxz+"\\"+ft;
//out.println("wxz1="+wxz1);
File ppp=new File(wxz1);
if (ppp.isDirectory()) {
out.println("<img src='images/dfloder.gif'><a href='filelist.jsp?dir="+wxz1+"'>"+ft+"</a><br>");
