关于file

Question

要那2种method才能完成:文件输入/输出  
给点例子

Answer 1

此回复为自动发出,仅用于显示而已，并无任何其他特殊作用
楼主【handsome2t】截止到2008-07-02 13:37:51的历史汇总数据(不包括此帖)：
发帖的总数量:1                        发帖的总分数:30                       
结贴的总数量:0                        结贴的总分数:0                        
无满意结贴数:0                        无满意结贴分:0                        
未结的帖子数:1                        未结的总分数:30                       
结贴的百分比:0.00  %               结分的百分比:0.00  %                  
无满意结贴率:---------------------无满意结分率:---------------------
如何结贴请参考这里：http://topic.csdn.net/u/20080501/09/ef7ba1b3-6466-49f6-9d92-36fe6d471dd1.html

Answer 2

InputStream ins = new FileInputStream(new File("输入文件名"));
OutputStream ous = new FileOutputStream(new File("输出文件名"));
byte[] b = new byte[1024*8];
while(ins.read(b)!=-1) {
   ous.write(b);
}
ous.flush();
ous.close();
ins.close();没运行测试，凑合看吧

Answer 3

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Date;import javax.swing.ImageIcon;public class Fileone { public static void main(String args[]){
   
  
  
  File file=new File("d:/yl.JPG");
  File file2=new File("d:/yll.JPG");
  
  FileInputStream fio=null;
  FileOutputStream fot=null;
  ImageIcon ii=null;
  try {
       fio=new FileInputStream(file);
       fot=new FileOutputStream(file2);
       byte [] io1=new byte[2048];
       int reads=0;
       
       while((reads=fio.read(io1, 0, 2048))>=0)
       {        
        System.out.println(reads+"======");
        fot.write(io1,0,reads);       
       }
       fio.close();
       fot.close();
       
   
  } catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }
  
  System.out.println("size----------"+file2.length());
  ii=new ImageIcon("D:/workspace/printstudio/filesystem/photo/20070208/02170bc2800.jpg.p");
  int height=ii.getIconHeight();
  int width=ii.getIconWidth();
  System.out.println("height"+height);
  System.out.println("width"+width);
  System.out.println("String"+ii.toString());
  
  
 }

Answer 4

http://www.java2000.net/forumdisplay.jsp?fid=73
去这里看看有你要的东西

Answer 5

    /**
     * 写文件
     * @param file 文件
     * @param str 内容
     */
    public static void writeToFile(File file, String str)
    {
        PrintWriter out = null;
        BufferedReader in = null;        try
        {
            if(!file.exists())
            {
                file.createNewFile();
            }            in = new BufferedReader(new StringReader(str));
            out = new PrintWriter(new BufferedWriter(new FileWriter(file)));            for(String line; (line = in.readLine()) != null;)
            {
                out.println(line);
            }
        }
        catch(IOException e)
        {
            e.printStackTrace();
        }
        finally
        {
            try
            {
                if(in != null)
                {
                    in.close();
                }                if(out != null)
                {
                    out.close();
                }
            }
            catch(IOException e)
            {
                e.printStackTrace();
            }
        }
    }    /**
     * 将文本内容追加到文件末尾
     * @param file 文件
     * @param content 需要追加的文本
     */
    public static void appendToFile(File file, String content)
    {
        FileOutputStream fos = null;        BufferedOutputStream buff = null;        try
        {
            fos = new FileOutputStream(file, true);
            buff = new BufferedOutputStream(fos);
            buff.write(content.getBytes());
            buff.flush();        }
        catch(IOException e)
        {
            e.printStackTrace();
        }
        finally
        {
            try
            {
                if(buff != null)
                {
                    buff.close();
                }                if(fos != null)
                {
                    fos.close();
                }
            }
            catch(IOException e)
            {
                e.printStackTrace();
            }
        }
    }    /**
     * 读取文件内容
     * @param path 文件路径
     * @return 文件内容
     */
    public static String getFileContent(String path)
    {
        StringBuffer text = new StringBuffer();
        File file = null;
        FileInputStream in = null;
        InputStreamReader isr = null;        try
        {
            file = new File(path);
            in = new FileInputStream(file);
            isr = new InputStreamReader(in);            for(int i = 0; i < file.length(); i++)
            {
                text.append((char)isr.read());
            }
        }
        catch(FileNotFoundException e)
        {
            e.printStackTrace();
        }
        catch(IOException ioe)
        {
            ioe.printStackTrace();
        }
        finally
        {
            try
            {
                if(isr != null)
                {
                    isr.close();
                }                if(in != null)
                {
                    in.close();
                }
            }
            catch(Exception e)
            {
                e.printStackTrace();
            }        }        return text.toString();
    }

Answer 6

File file = new File("d://content/use.txt");
FileInputStream fis = new FileInputStream(file);
BufferedReader br = new BufferedReader(new InputStreamReader(fis));
String len = null;
while ((len=br.readLine())!=null) {
        String str = br.readLine();
        
}
} catch (Exception e) {
e.printStackTrace();
}
File file = new File("d:\\content");
file.mkdir();
FileOutputStream fos = new FileOutputStream("d://content//use.txt");
PrintWriter pw = new PrintWriter(fos);
String str = "success";
pw.println(str);
pw.close();

Answer 7

前几天有人发了个IOUtil，比这个全多了，自己找找