请教一个IO流的问题,只要给出代码解决,马上结帖!!!

[刘彬彬]

打开一个文本文件，每次读取一行内容。将每行作为一个String读入，并将那个String对象置入一个Vector里。按相反的顺序打印出Vector中的所有行
在上面的基础上又打开一个文本文件，以便将文字写入其中。将Vector中的行随同行号一起写入文件。

[anqini]

package zhao;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Vector;


public class Test 
{ 
    
     public static void main(String args[]) 
     { 
    	 Vector<String> v = new Vector<String>();
    	 BufferedReader bufin = null;
    	 BufferedWriter bufout = null;
    	try {
		    bufin = new BufferedReader(new FileReader("D:\\eclipse\\test.txt"));
			String s = null;
			while((s=bufin.readLine()) != null) {
				v.add(s);
			}
			bufin.close();
			String [] array = v.toArray(new String[v.size()]);
			for(int i=array.length-1;i>=0;i-- ) {
				
				System.out.println(array[i]);
			}
		    bufout = new BufferedWriter(new FileWriter("D:\\eclipse\\testin.txt"));
			for(String s1:v) {
				bufout.write(s1+"\n");
			}
			bufout.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}finally {
			if(bufin!=null) {
				try {
					bufin.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if(bufout!=null) {
				try {
					bufout.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
         
         
     } 
} 

[bootupnow]

蹭分^_^

import java.io.*;
import java.util.*;
 
public class Test{
    
    public void doSomething(String inFileName,String outFileName) throws IOException{
        File inFile = new File(inFileName);
        File outFile = new File(outFileName);
        
        BufferedReader br = new BufferedReader(new FileReader(inFile));
        BufferedWriter bw = new BufferedWriter(new FileWriter(outFile));
        
        
        String s = null;
        Vector<String> list = new Vector<String>();
        while((s = br.readLine()) != null){
            list.add(s);
        }
        br.close();
        
        Collections.reverse(list);
        
        int line = 1;
        for(String tmp:list){
            System.out.println(tmp);
            bw.write((line++) + "\t" + tmp);
            bw.newLine();           
        }        
        bw.flush();
        bw.close(); 
    }
    
    public static void main(String[] args){
        try {
            new Test().doSomething("C:/in.txt","C:/out.txt");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

[anqini]

// 再发一次,刚才行番号没打!
package zhao;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Vector;


public class Test 
{ 
    
     public static void main(String args[]) 
     { 
    	 Vector<String> v = new Vector<String>();
    	 BufferedReader bufin = null;
    	 BufferedWriter bufout = null;
    	try {
		    bufin = new BufferedReader(new FileReader("D:\\eclipse\\test.txt"));
			String s = null;
			while((s=bufin.readLine()) != null) {
				v.add(s);
			}
			bufin.close();
			String [] array = v.toArray(new String[v.size()]);
			for(int i=array.length-1;i>=0;i-- ) {
				
				System.out.println(array[i]);
			}
		    bufout = new BufferedWriter(new FileWriter("D:\\eclipse\\testin.txt"));
		    int countnum = 1;
		    String crlf=System.getProperty("line.separator");
			for(String s1:v) {
				bufout.write(countnum+": "+s1+crlf);	
				countnum++;
			}
			bufout.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}finally {
			if(bufin!=null) {
				try {
					bufin.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if(bufout!=null) {
				try {
					bufout.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
  
     } 
} 

[apm70plus]

因为很简单，就偷懒了，没有写注释

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Vector;

public class FileIOTest {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String fileName = "D:\\testfile.txt";
String destFile = "D:\\destination.txt";
String strTemp = "";
BufferedReader reader = null;
BufferedWriter writer = null;
Vector<String> vec = new Vector<String>();
try {
reader = new BufferedReader(new FileReader(fileName));
writer = new BufferedWriter(new FileWriter(destFile));
strTemp = reader.readLine();
while (strTemp != null) {
vec.add(strTemp);
strTemp = reader.readLine();
}
reader.close();
for (int i = 0; i < vec.size(); i++) {
System.out.println(vec.get(vec.size() -1 - i));
writer.write(i + 1 + vec.get(i));
writer.newLine();
}
writer.close();
}catch (FileNotFoundException fe) {
fe.printStackTrace();
}catch (IOException ie) {
ie.printStackTrace();
}
}
}