寻求高手解决文件读写问题

Question

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.FileOutputStream;
import java.io.File;public class TestFileIO {    public TestFileIO() {
    }    public static void main(String[] args){
        TestFileIO test = new TestFileIO();
       test.writeFile("c:\\writeFile.txt",test.readFile("c:\\readFile.txt"));
    }
    public void writeFile(String path,String outStr)
    {
        try {
            FileOutputStream out = new FileOutputStream(path,true);
            out.write(outStr.getBytes());
            out.close();
        } catch (Exception ex) {
        }
    }    public String readFile(String path)
    {
        String temp = "";
        try
        {
        FileInputStream in = new FileInputStream(path);
        int n = 0;
        while((n=in.read())!=-1)
        {
            temp += (char)n;
        }
        temp = new String(temp.getBytes("ISO-8859-1"),"GBK");
        System.out.println(temp);
        }catch(Exception ex){}
        return temp;
    }
}假如readFile.txt里面是：
a.bc a100bnlkfsdadfasdawefes
a.bc 13ef4zseesfadfdawdawfes
a.bc 3fzseflkfsdadfadwawwasd
a.bc 35443nlkfsdadfawdaweasd
a.bc a100bnlkfsdadfadwdawwad我需要在writeFile.txt写入时 去掉a.bc和空格 只要后面的数据
每20个字符自动回车

Answer 1

好说！
把writeFile方法改改！    public void writeFile(String path,String outStr)
    {
        try {
            outStr = outStr.replaceAll("a.bc ", ""); // 去掉a.bc和空格
            FileOutputStream out = new FileOutputStream(path,true);
            out.write(outStr.getBytes());
            out.close();
        } catch (Exception ex) {
        }
    }

Answer 2

public void writeFile(String path,String outStr)
    {
        try {
            outStr=outStr.replaceAll("a.bc ","");//去掉a.bc加空格           
            outStr=outStr.replaceAll("\\n","");//去掉原来的换行符
            outStr=outStr.replaceAll("(.{20})","$1\n");//每20个字符换行            FileOutputStream out = new FileOutputStream(path,true);
            out.write(outStr.getBytes());
            out.close();
        } catch (Exception ex) {
        }
    }

Answer 3

import java.io.*;
import java.util.*;public class TestFileIO
{    private String inputfile = "./readFile.txt";
    private String outputfile = "./writeFile.txt";
    private BufferedReader in = null;
    private PrintWriter out = null;

    public TestFileIO() 
    {
 try
 {
    in = new BufferedReader(new FileReader(new File(inputfile)));     out = new PrintWriter(new FileWriter(new File(outputfile))); 
 }
 catch(FileNotFoundException e)
 {
     System.out.println("test 1");  
 }
 catch(IOException e1)
 {
     System.out.println("test 2");
 }
    }    public static void main(String[] args)
    {
        TestFileIO test = new TestFileIO();
        test.writeFile();
    }
    public void writeFile()
    {
        try 
{
             String str = in.readLine();
     while (str != null)
     {
   System.out.println("old value:" + str);  
   StringTokenizer t = new StringTokenizer(str," ");
   
   while(t.hasMoreTokens())
   {
                       String s = t.nextToken();
       if (s.equals("a.bc"));        
       else
       {
     out.print(s.trim());
       }
       
   }
                   out.println();
   out.flush();
   str = in.readLine();
     }
} 
catch (IOException e2) 
{
     System.out.println("test 3");
        }
    }
}在Solaris中写的,只需将inputfile,outputfile值改成需要的路径即可.

Answer 4

lip009(深蓝忧郁)  我想要的是 一行超过20个 其他的字符就排在下一行

Answer 5

public void writeFile(String path,String outStr)
    {
        try {
            outStr=outStr.replaceAll("a.bc ","");//去掉a.bc加空格           
            //去掉这行
            //outStr=outStr.replaceAll("\\n","");//去掉原来的换行符
            outStr=outStr.replaceAll("(.{20})(.*\\n)","$1\n$2");//每20个字符换行            FileOutputStream out = new FileOutputStream(path,true);
            out.write(outStr.getBytes());
            out.close();
        } catch (Exception ex) {
        }
    }

Answer 6

lip009(深蓝忧郁)大哥 你给的代码输出是
a100bnlkfsdadfasdawefes
13ef4zseesfadfdawdawfes
3fzseflkfsdadfadwawwasd
 我想要的结果是这样的
a100bnlkfsdadfasdawe
fes13ef4zseesfadfdaw
dawfes3fzseflkfsdadf
adwawwasd

Answer 7

public void writeFile(String path,String outStr)
    {
        try {
            outStr=outStr.replaceAll("a.bc ","");//去掉a.bc加空格           
            outStr=outStr.replaceAll("\\n","");//去掉原来的换行符
            outStr=outStr.replaceAll("(.{20})","$1\n");//每20个字符换行            FileOutputStream out = new FileOutputStream(path,true);
            out.write(outStr.getBytes());
            out.close();
        } catch (Exception ex) {
        }
    }输出结果:
a100bnlkfsdadfasdawe
fes13ef4zseesfadfdaw
dawfes3fzseflkfsdadf
adwawwasd35443nlkfsd
adfawdaweasda100bnlk
fsdadfadwdawwad
public void writeFile(String path,String outStr)
    {
        try {
            outStr=outStr.replaceAll("a.bc ","");//去掉a.bc加空格           
            //去掉这行
            //outStr=outStr.replaceAll("\\n","");//去掉原来的换行符
            outStr=outStr.replaceAll("(.{20})(.*\\n)","$1\n$2");//每20个字符换行            FileOutputStream out = new FileOutputStream(path,true);
            out.write(outStr.getBytes());
            out.close();
        } catch (Exception ex) {
        }
    }
输出结果:a100bnlkfsdadfasdawe
fes
13ef4zseesfadfdawdaw
fes
3fzseflkfsdadfadwaww
asd
35443nlkfsdadfawdawe
asd
a100bnlkfsdadfadwdaw
wad

Answer 8

对了，上面这有点问题:
outStr=outStr.replaceAll("a.bc ","");//去掉a.bc加空格
改一下:
outStr=outStr.replaceAll("a\\.bc ","");//去掉a.bc加空格

Answer 9

我就是想要下面的输出结果输出结果:
a100bnlkfsdadfasdawe
fes13ef4zseesfadfdaw
dawfes3fzseflkfsdadf
adwawwasd35443nlkfsd
adfawdaweasda100bnlk
fsdadfadwdawwad你上面的代码没有实现啊 你看你是不是贴错了！！
先谢了

Answer 10

就这一段代码,没有问题的......我已经测试过public void writeFile(String path,String outStr)
    {
        try {
            outStr=outStr.replaceAll("a.bc ","");//去掉a.bc加空格           
            outStr=outStr.replaceAll("\\n","");//去掉原来的换行符
            outStr=outStr.replaceAll("(.{20})","$1\n");//每20个字符换行            FileOutputStream out = new FileOutputStream(path,true);
            out.write(outStr.getBytes());
            out.close();
        } catch (Exception ex) {
        }
    }输出结果:
a100bnlkfsdadfasdawe
fes13ef4zseesfadfdaw
dawfes3fzseflkfsdadf
adwawwasd35443nlkfsd
adfawdaweasda100bnlk
fsdadfadwdawwad

Answer 11

String str="a.bc a100bnlkfsdadfasdawefes\na.bc 13ef4zseesfadfdawdawfes\na.bc 3fzseflkfsdadfadwawwasd\na.bc 35443nlkfsdadfawdaweasd\na.bc a100bnlkfsdadfadwdawwad";    str=str.replaceAll("a\\.bc ","");
    str=str.replaceAll("\\n","");
    str=str.replaceAll("(.{20})","$1\n");
    System.out.println(str);这是我的测试代码

Answer 12

现在的问题是 我是从readFile.txt文件里面读出数据的啊readFile.txt里面是：
a.bc a100bnlkfsdadfasdawefes
a.bc 13ef4zseesfadfdawdawfes
a.bc 3fzseflkfsdadfadwawwasd
a.bc 35443nlkfsdadfawdaweasd
a.bc a100bnlkfsdadfadwdawwad

Answer 13

String str="a.bc a100bnlkfsdadfasdawefes\na.bc 13ef4zseesfadfdawdawfes\na.bc 3fzseflkfsdadfadwawwasd\na.bc 35443nlkfsdadfawdaweasd\na.bc a100bnlkfsdadfadwdawwad";System.out.println(str);
这个字符穿输出就是:
a.bc a100bnlkfsdadfasdawefes
a.bc 13ef4zseesfadfdawdawfes
a.bc 3fzseflkfsdadfadwawwasd
a.bc 35443nlkfsdadfawdaweasd
a.bc a100bnlkfsdadfadwdawwad

Answer 14

再改一下,加上替换\r回车换行:输出到txt文件以后用写字板打开就是你想要的效果,记事本不认识\n换行符
public void writeFile(String path,String outStr)
    {
        try {
            outStr=outStr.replaceAll("a.bc ","");//去掉a.bc加空格           
            outStr=outStr.replaceAll("\\n*\\r*","");//去掉原来的换行符
            outStr=outStr.replaceAll("(.{20})","$1\n");//每20个字符换行            FileOutputStream out = new FileOutputStream(path,true);
            out.write(outStr.getBytes());
            out.close();
        } catch (Exception ex) {
        }
    }