Bài 31: Đọc/ghi file dùng luồng ký tự trong Java

[linhads]

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nop bai (open)
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import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]bufferedreader[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]filereader[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]filewriter[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]ioexception[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]inputstreamreader[/color][color=#007700];  public class [/color][color=#0000bb]coppyfile [/color][color=#007700]{    @[/color][color=#0000bb]suppresswarnings[/color][color=#007700]([/color][color=#dd0000]"resource"[/color][color=#007700])    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) [/color][color=#0000bb]throws ioexception    [/color][color=#007700]{        [/color][color=#ff8000]//copy file input.txt sang file output.txt su dung cach doc van ban               //doc file        [/color][color=#0000bb]bufferedreader br [/color][color=#007700]= new [/color][color=#0000bb]bufferedreader[/color][color=#007700](new [/color][color=#0000bb]inputstreamreader[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]));        [/color][color=#0000bb]filewriter fw[/color][color=#007700];               [/color][color=#0000bb]string tenfile[/color][color=#007700];        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhập đường dẫn file:"[/color][color=#007700]);        [/color][color=#0000bb]tenfile [/color][color=#007700]= [/color][color=#0000bb]br[/color][color=#007700].[/color][color=#0000bb]readline[/color][color=#007700]();               [/color][color=#0000bb]filereader fr [/color][color=#007700]= new [/color][color=#0000bb]filereader[/color][color=#007700]([/color][color=#0000bb]tenfile[/color][color=#007700]);        [/color][color=#0000bb]bufferedreader b [/color][color=#007700]= new [/color][color=#0000bb]bufferedreader[/color][color=#007700]([/color][color=#0000bb]fr[/color][color=#007700]);        [/color][color=#0000bb]string s[/color][color=#007700];        [/color][color=#ff8000]//doc tung dong van ban        [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].print([/color][color=#dd0000]"nhập đường dẫn file luu:"[/color][color=#007700]);        [/color][color=#0000bb]tenfile [/color][color=#007700]= [/color][color=#0000bb]br[/color][color=#007700].[/color][color=#0000bb]readline[/color][color=#007700]();               [/color][color=#0000bb]fw [/color][color=#007700]= new [/color][color=#0000bb]filewriter[/color][color=#007700]([/color][color=#0000bb]tenfile[/color][color=#007700]);               while(([/color][color=#0000bb]s [/color][color=#007700]= [/color][color=#0000bb]b[/color][color=#007700].[/color][color=#0000bb]readline[/color][color=#007700]()) != [/color][color=#0000bb]null[/color][color=#007700])        {            [/color][color=#0000bb]s [/color][color=#007700]= [/color][color=#0000bb]s [/color][color=#007700]+ [/color][color=#dd0000]"
"[/color][color=#007700];            [/color][color=#0000bb]fw[/color][color=#007700].[/color][color=#0000bb]write[/color][color=#007700]([/color][color=#0000bb]s[/color][color=#007700]);        }               [/color][color=#ff8000]//ghi file               [/color][color=#0000bb]fw[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();    }}[/color] 

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[thammyauviet]

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ackage $31docghidlieudungluongkytu;
 
 
 
 
import java.io.bufferedreader;
import java.io.filereader;
import java.io.filewriter;
import java.io.ioexception;
 
 
 
 
public class baitap {
public static void main(string[] args) {
try{
filereader fr=new filereader("d:\\vy2301.txt");
bufferedreader br=new bufferedreader(fr);
filewriter fw=new filewriter("d:\\vynhat.txt");
string s;
while((s=br.readline())!=null){
fw.write(s);
system.out.println(s);
}
fr.close();
fw.close();
}catch(ioexception e1){
system.out.println(e1);
}
}
}

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[ngamnguyen4454]

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<div class="attribution type"><noscript>bai31 -doc ghi file dung luong ki tu trong java (move your mouse to reveal the content)</noscript>

bai31 -doc ghi file dung luong ki tu trong java (open)
bai31 -doc ghi file dung luong ki tu trong java (close)

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bai31package baitapvenha[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]bufferedreader[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]filenotfoundexception[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]filereader[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]filewriter[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]ioexception[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]util[/color][color=#007700].[/color][color=#0000bb]scanner[/color][color=#007700];[/color][color=#ff8000]/*** viết chương trình copy nội dung file "input.txt" sang file "output.txt" sử* dụng cách đọc ghi văn bản! bạn nào làm xong cố gắng bớt chút ít thời gian* đăng lên cho các bạn khác cùng tham khảo nhé!*/[/color][color=#007700]public class [/color][color=#0000bb]bai31 [/color][color=#007700]{     public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) [/color][color=#0000bb]throws ioexception [/color][color=#007700]{          [/color][color=#0000bb]scanner sc [/color][color=#007700]= new [/color][color=#0000bb]scanner[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]);          [/color][color=#0000bb]string part1[/color][color=#007700], [/color][color=#0000bb]part2[/color][color=#007700];          [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhap duong dan file nguon ( start = :\\\\...\\*.*)"[/color][color=#007700]);          [/color][color=#0000bb]part1 [/color][color=#007700]= [/color][color=#0000bb]sc[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();          [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"nhap duong dan file dich ( start = :\\\\...\\*.*)"[/color][color=#007700]);          [/color][color=#0000bb]part2 [/color][color=#007700]= [/color][color=#0000bb]sc[/color][color=#007700].[/color][color=#0000bb]nextline[/color][color=#007700]();         [/color][color=#ff8000]/*part1 = "e:\\thongtinsv.txt";          part2 = "d:\\thongtinghilai.txt";         */          [/color][color=#0000bb]bai31 test [/color][color=#007700]= new [/color][color=#0000bb]bai31[/color][color=#007700]();          [/color][color=#0000bb]test[/color][color=#007700].[/color][color=#0000bb]copyfile[/color][color=#007700]([/color][color=#0000bb]part1[/color][color=#007700], [/color][color=#0000bb]part2[/color][color=#007700]);     }          public [/color][color=#0000bb]void copyfile[/color][color=#007700]([/color][color=#0000bb]string part1[/color][color=#007700], [/color][color=#0000bb]string part2[/color][color=#007700]) [/color][color=#0000bb]throws ioexception [/color][color=#007700]{          [/color][color=#0000bb]filereader fr[/color][color=#007700];          [/color][color=#0000bb]filewriter fw [/color][color=#007700]= [/color][color=#0000bb]null[/color][color=#007700];          try {                 [/color][color=#0000bb]fr [/color][color=#007700]= new [/color][color=#0000bb]filereader[/color][color=#007700]([/color][color=#0000bb]part1[/color][color=#007700]);                 [/color][color=#0000bb]fw [/color][color=#007700]= new [/color][color=#0000bb]filewriter[/color][color=#007700]([/color][color=#0000bb]part2[/color][color=#007700]);                 [/color][color=#0000bb]bufferedreader br [/color][color=#007700]= new [/color][color=#0000bb]bufferedreader[/color][color=#007700]([/color][color=#0000bb]fr[/color][color=#007700]);                 [/color][color=#0000bb]string str[/color][color=#007700];                 [/color][color=#ff8000]// doc tung dong van ban                 [/color][color=#007700]while (([/color][color=#0000bb]str [/color][color=#007700]= [/color][color=#0000bb]br[/color][color=#007700].[/color][color=#0000bb]readline[/color][color=#007700]()) != [/color][color=#0000bb]null[/color][color=#007700]) {                       [/color][color=#0000bb]str [/color][color=#007700]= [/color][color=#0000bb]str [/color][color=#007700]+ [/color][color=#dd0000]" "[/color][color=#007700];                       [/color][color=#0000bb]fw[/color][color=#007700].[/color][color=#0000bb]write[/color][color=#007700]([/color][color=#0000bb]str[/color][color=#007700]);                       [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#0000bb]str[/color][color=#007700]);                 }         } catch ([/color][color=#0000bb]filenotfoundexception e[/color][color=#007700]) {             [/color][color=#ff8000]// todo auto-generated catch block             [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"error: " [/color][color=#007700]+ [/color][color=#0000bb]e[/color][color=#007700]);         }         [/color][color=#0000bb]fw[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();      }}[/color] 

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[xuanninh164]

[color=#000000]
import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]bufferedreader[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]filewriter[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]fileinputstream[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]filereader[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]ioexception[/color][color=#007700];class [/color][color=#0000bb]copy[/color][color=#007700]{    public [/color][color=#0000bb]void read[/color][color=#007700]()[/color][color=#0000bb]throws ioexception[/color][color=#007700]{        [/color][color=#0000bb]bufferedreader buff[/color][color=#007700];        [/color][color=#0000bb]filewriter f[/color][color=#007700];        [/color][color=#0000bb]fileinputstream ff[/color][color=#007700];        try{            [/color][color=#0000bb]f[/color][color=#007700]=new [/color][color=#0000bb]filewriter[/color][color=#007700]([/color][color=#dd0000]"g:\\java\\output.txt"[/color][color=#007700]);          [/color][color=#0000bb]buff[/color][color=#007700]=new [/color][color=#0000bb]bufferedreader[/color][color=#007700](new [/color][color=#0000bb]filereader[/color][color=#007700]([/color][color=#dd0000]"g:\\java\\input.txt"[/color][color=#007700]));         }catch([/color][color=#0000bb]ioexception e[/color][color=#007700]){            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"error open file"[/color][color=#007700]);            return;        }        [/color][color=#0000bb]string s[/color][color=#007700];        try{        while(([/color][color=#0000bb]s[/color][color=#007700]=[/color][color=#0000bb]buff[/color][color=#007700].[/color][color=#0000bb]readline[/color][color=#007700]())!=[/color][color=#0000bb]null[/color][color=#007700]){            [/color][color=#0000bb]f[/color][color=#007700].[/color][color=#0000bb]write[/color][color=#007700]([/color][color=#0000bb]s[/color][color=#007700]);        }        }catch([/color][color=#0000bb]ioexception e[/color][color=#007700]){            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#dd0000]"error reading file"[/color][color=#007700]);        }        [/color][color=#0000bb]f[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();    }}public class [/color][color=#0000bb]read_vanban [/color][color=#007700]{    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) [/color][color=#0000bb]throws ioexception [/color][color=#007700]{        [/color][color=#0000bb]copy c[/color][color=#007700]=new [/color][color=#0000bb]copy[/color][color=#007700]();        [/color][color=#0000bb]c[/color][color=#007700].[/color][color=#0000bb]read[/color][color=#007700]();    }}[/color] 

mình lưu file dưới dạng văn bản tiếng việt, sau đó đọc vào file output thì nó có những kí tự lạ, mấy bạn giúp với

bạn chỉnh utf-8 trong eclipse đi

[Q2brhotgirlsngoctrinh]

// mong mọi người đóng góp ý kiến để mình hoàn thiện hơn

[color=#000000]
import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]bufferedreader[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]filereader[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]filewriter[/color][color=#007700];[/color][color=#0000bb]import java[/color][color=#007700].[/color][color=#0000bb]io[/color][color=#007700].[/color][color=#0000bb]inputstreamreader[/color][color=#007700]; [/color][color=#ff8000]/*** created by whynotme on 16/03/2015.*/[/color][color=#007700]public class [/color][color=#0000bb]readwriteread [/color][color=#007700]{    public static [/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]readfile[/color][color=#007700]([/color][color=#0000bb]string url[/color][color=#007700]) {        [/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]s [/color][color=#007700]= new [/color][color=#0000bb]string[/color][color=#007700][[/color][color=#0000bb]10[/color][color=#007700]];        [/color][color=#0000bb]int index [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700];        try  {            [/color][color=#0000bb]filereader fr [/color][color=#007700]= new [/color][color=#0000bb]filereader[/color][color=#007700]([/color][color=#0000bb]url[/color][color=#007700]);            [/color][color=#0000bb]bufferedreader br [/color][color=#007700]= new [/color][color=#0000bb]bufferedreader[/color][color=#007700]([/color][color=#0000bb]fr[/color][color=#007700]);            while (([/color][color=#0000bb]s[/color][color=#007700][[/color][color=#0000bb]index[/color][color=#007700]] = [/color][color=#0000bb]br[/color][color=#007700].[/color][color=#0000bb]readline[/color][color=#007700]()) != [/color][color=#0000bb]null[/color][color=#007700]) {                [/color][color=#0000bb]index[/color][color=#007700]++;            }        } catch ([/color][color=#0000bb]exception e[/color][color=#007700]) {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#0000bb]e[/color][color=#007700]);        }        return [/color][color=#0000bb]s[/color][color=#007700];    }    public static [/color][color=#0000bb]void writefile[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]url[/color][color=#007700], [/color][color=#0000bb]string link[/color][color=#007700]) {        [/color][color=#0000bb]filewriter fw[/color][color=#007700];        [/color][color=#0000bb]bufferedreader br [/color][color=#007700]= new [/color][color=#0000bb]bufferedreader[/color][color=#007700](new [/color][color=#0000bb]inputstreamreader[/color][color=#007700]([/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]in[/color][color=#007700]));        try {            [/color][color=#0000bb]fw [/color][color=#007700]= new [/color][color=#0000bb]filewriter[/color][color=#007700]([/color][color=#0000bb]link[/color][color=#007700]);            for ([/color][color=#0000bb]int i [/color][color=#007700]= [/color][color=#0000bb]0[/color][color=#007700]; [/color][color=#0000bb]i [/color][color=#007700]< [/color][color=#0000bb]url[/color][color=#007700].[/color][color=#0000bb]length[/color][color=#007700]; [/color][color=#0000bb]i[/color][color=#007700]++) {                if ([/color][color=#0000bb]url[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]] != [/color][color=#0000bb]null[/color][color=#007700]) {                    [/color][color=#0000bb]fw[/color][color=#007700].[/color][color=#0000bb]write[/color][color=#007700]([/color][color=#0000bb]url[/color][color=#007700][[/color][color=#0000bb]i[/color][color=#007700]]);                }            }            [/color][color=#0000bb]fw[/color][color=#007700].[/color][color=#0000bb]close[/color][color=#007700]();        } catch ([/color][color=#0000bb]exception e[/color][color=#007700]) {            [/color][color=#0000bb]system[/color][color=#007700].[/color][color=#0000bb]out[/color][color=#007700].[/color][color=#0000bb]println[/color][color=#007700]([/color][color=#0000bb]e[/color][color=#007700]);        }    }    public static [/color][color=#0000bb]void main[/color][color=#007700]([/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]args[/color][color=#007700]) {        [/color][color=#0000bb]string intputfile [/color][color=#007700]= [/color][color=#dd0000]"e:\\input.txt"[/color][color=#007700];        [/color][color=#0000bb]string outfile [/color][color=#007700]= [/color][color=#dd0000]"e:\\output.txt"[/color][color=#007700];        [/color][color=#0000bb]string[/color][color=#007700][] [/color][color=#0000bb]file [/color][color=#007700]= [/color][color=#0000bb]readfile[/color][color=#007700]([/color][color=#0000bb]intputfile[/color][color=#007700]);        [/color][color=#0000bb]writefile[/color][color=#007700]([/color][color=#0000bb]file[/color][color=#007700], [/color][color=#0000bb]outfile[/color][color=#007700]);    }}[/color]