如何读取一个文件并生成多个文本输出文件

Question

我有一个如下所示的文本文件。我的问题是我想阅读我的 txt 文件直到每一段并在 java

上为每一段生成单独的新文本文件

>T0646 OR188, , 93 residues
MQEERKKLLEKLEKILDEVTDGAPDEARERIEKLAKDVKDELEEGDAKNMIEKFRDEMEQ
MYKDAPNAVMEQLLEEIEKLLKKAGSLVPRGSY


>T0647 HR5514A, , 157 residues
MTERLSAEQIKEYKGVFEMFDEEGNGEVKTGELEWLMSLLGINPTKSELASMAKDVDRDN
KGFFFNCDGFLALMGVYHEKAQNQESELRAAFRVFDKEGKGYIDWNTLKYVLMNAGEPLN
EVEAEQMMKEADKDGDRTIDYEEFVAMMTGESFKLIQ


>T0648 CpN10, , 102 residues
MAGQAFRKFLPLFDRVLVERSAAETVTKGGIMLPEKSQGKVLQATVVAVGSGSKGKGGEI
QPVSVKVGDKVLLPEYGGTKVVLDDKDYFLFRDGDILGKYVD

public class Test{

    public static void main (String[] args){          
        BufferedReader br=null;
        BufferedWriter bw= null;

        File file = new File("...Desktop\New folder\out.txt");
        try {
            String s;
            String text = "";
            br = new BufferedReader(new FileReader(
                    "....Desktop\New folder\casp10.txt"));
            FileWriter fw = new FileWriter(file.getAbsoluteFile());
            bw = new BufferedWriter(fw);
            while ((s=br.readLine())!= null) {
                if(s.contains(">")){
                    String line=br.readLine();
                    if(line!=null) {
                        System.out.println(line);
                        bw.write('\n'+ line );
                    }
                }
                bw.write(s +"\n");
            }
        } catch(IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if(br!=null) {
                    br.close();
                    bw.close();
                }
            } catch(IOException e) {
                e.printStackTrace();
            } 
        }
    }
}

Answer 1

每次您想使用不同的 Writer 打印时调用此方法

    public class MySaver{
    private PrintWriter innerWriter;
    public MySaver(Writer writer)
    {
    this.innerWriter = new PrintWriter(writer);
    }

    public void save(String c) throws IOException {
        innerWriter.write(c);
    }

}

或者首先使用 StringBuilder 创建字符串并附加 would you like 然后打印它。 String Builder Doc

Answer 2

逻辑是在你的 while 循环中创建一个新的 FileWriter 对象，每次你看到 '>' 符号。我正在使用简单的 int 文件计数器来命名多个输出文件即。

out0.txt, out1.txt, out2.txt and so on.

见下面的工作代码：

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class FileWriting{

    public static void main (String[] args){          
        BufferedReader br=null;
        BufferedWriter bw= null;

        String outFileName = "D:\New folder\out";
        try {
            String s;
            br = new BufferedReader(new FileReader("D:\New folder\casp10.txt"));
            int fileCounter = 0;

            while ((s=br.readLine())!= null) {
                if(s.contains(">")){
                    if(bw != null){
                        bw.close();
                    }
                    FileWriter fw = new FileWriter(outFileName + (fileCounter++) + ".txt");
                    bw = new BufferedWriter(fw);
                }
                bw.write(s +"\n");
            }
        } catch(IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if(br!=null) {
                    br.close();
                    bw.close();
                }
            } catch(IOException e) {
                e.printStackTrace();
            } 
        }
    }
}

如何读取一个文件并生成多个文本输出文件

How to Read one file and generating multiple text output file

java

io