再给大家一个进行IO操作的JAVABEAN，吐血奉献哦~~~~搜集和调试了很久，没有问题哦~~~~-JSP教程,资料/其它

/*
*author:tyfun
*datetime:2002.12.19
*package:com.westarsoft.io
*/

package com.westarsoft.io;

import java.io.*;

public class fileoperation {
    private static string str = new string();
    private static string filename = new string();
    private static string filepath = new string();
    private static string text = new string();
    public string getstr() {
        return str;
    }
    public void setstr(string str) {
        this.str = str;
    }
    public string getfilename() {
        return filename;
    }
    public void setfilename(string filename) {
        this.filename = filename;
    }
    public string getfilepath() {
        return filepath;
    }
    public void setfilepath(string filepath) {
        this.filepath = filepath;
    }
    public string gettext() {
        return text;
    }
    public void settext(string text) {
        this.text = text;
    }
    /*
     *use:
     *setstr(string)
     *setfilename(string)
     */
    public void writefile() {
        try {
            printwriter pw = new printwriter(new fileoutputstream(filename));
            pw.println(str);
            pw.close();
        }
        catch(exception e) {
            system.out.println(e);
        }
    }
    /*
     *use:
     *readfile(string)
     */    
    public string readfile(string filename) {
        string record = "";
        string readfile = "";
        int reccount = 0;
        try {
            filereader fr = new filereader(filename);
               bufferedreader br = new bufferedreader(fr);
               record = new string();
               while ((record = br.readline()) != null) {
                 //reccount++;
                 //system.out.println(reccount + ": " + record);
                 readfile = readfile+"<br>"+record;
                 //readfile = readfile+record;
            }
            br.close();
            fr.close();
         }
         catch (ioexception e) {
            system.out.println("uh oh, got an ioexception error!");
             e.printstacktrace();
        }
        return readfile;
    }
    /*
     *use:
     *copyfile(string,string)
     */
     public void copyfile(string from,string to) {
        file fromfile,tofile;
        fromfile = new file(from);
        tofile = new file(to);
        fileinputstream fis = null;
        fileoutputstream fos = null;
        try {
            tofile.createnewfile();
              fis = new fileinputstream(fromfile);
              fos = new fileoutputstream(tofile);
              int bytesread;
              byte[] buf = new byte[4 * 1024];
              while((bytesread=fis.read(buf))!=-1) {
                fos.write(buf,0,bytesread);
              }
              fos.flush();
              fos.close();
              fis.close();
        }
        catch(exception e) {
              system.out.println(e);
        }
    }
    /*
     *use:
     *emptydir()
     */
    public void emptydir(string directory) {
        file path = new file(directory);
        if(path.isdirectory()) {
            file[] entries = path.listfiles( );
            for(int i=0; i<entries.length; i++) {
                entries[i].delete( );
            }
        }
    }
    /*
     *use:
     *deletedirectory()
     */
    public void deldir(file directory) {
        if(directory.isdirectory()) {
            try {
                file[] entries = directory.listfiles( );
                for(int i=0; i<entries.length; i++) {
                    if(entries[i].isdirectory()) {
                        deldir(entries[i]);
                    }
                    else {
                        entries[i].delete( );
                    }
                }
                directory.delete();
            }
            catch(exception e) {
                system.out.println(e);
            }
        }
    }
    /*
     *use:
     *setfilepath(string)
     *settext(string)
     */
    public static boolean fulltextsearch(){
        try {
            file file = new file(filepath);
            long filelength = 0;
            filelength = file.length();
            fileinputstream fis = new fileinputstream(filepath);
            byte[] buf = new byte[(int)filelength];
            int bytesread = 0;
            stringbuffer sbffile = new stringbuffer();
            stringbuffer sbftext = new stringbuffer();
            string src = "";
            string search = "";
            while((bytesread = fis.read(buf)) != -1){
                for (int i = 0; i < buf.length; i++) {
                    sbffile = sbffile.append(buf[i]);
                }
            }
            src = sbffile.tostring();
            byte[] buftext = new byte[text.length()];
            buftext = text.getbytes();
            for (int j = 0; j < buftext.length; j++) {
                sbftext = sbftext.append(buftext[j]);
            }
            search = sbftext.tostring();
            if(src.indexof(search)>0){
                return true;
            }
            else{
                return false;
            }
        }
        catch (exception ex) {
            return false;
        }
    }
}

[版主注释]
sonymusic 于 2003-1-14 11:13:21 加贴在 java程序设计 ←返回版面         

其实java本身的流操作非常完美。前面几个方法并不需要。
而且你的类写的不合适。后面几个方法应该用静态方法。