对文本的操作.

Question

按楼主的需求，保存的文件跟源文件的区别就是1。没有回车，2。没有重复的,3,没有空行这样的话很简单
import java.io.*;
public class T1023 {
    private File source;
    private String dir = ".\\output\\";
    public T1023(String file){
        source = new File(dir+file);
    }
    
    public void store(String filename)throws IOException{
        BufferedReader br = new BufferedReader(new FileReader(source));
        OutputStream os = new FileOutputStream(dir+filename);
        String line = "";
        while((line=br.readLine())!=null){
            line = line.trim();
            if(line.equals("\n"))
                continue;
            line = line.replaceAll(";{2,}",";");
            os.write(line.getBytes());
        }
        os.close();
        br.close();
    }
    
    public static void main(String args[])throws IOException{
        new T1023("t1023_source.txt").store("t1023.txt");
    }
}

Answer 1

import java.io.*;
public class T1023 {
    private File source;
    private String dir = ".\\output\\";
    public T1023(String file){
        source = new File(dir+file);
    }
    
    public void store(String filename)throws IOException{
        BufferedReader br = new BufferedReader(new FileReader(source));
        OutputStream os = new FileOutputStream(dir+filename);
        String line = "";
        while((line=br.readLine())!=null){
            line = line.trim();
            if(line.equals("\n")||line.indexOf("吉林")==-1)
                continue;
            else{
                os.write(line.replaceAll(";{2,}",";").getBytes());
                while((line=br.readLine())!=null && line.trim().length()>0){
                    os.write(line.trim().replaceAll(";{2,}",";").getBytes());
                }
            }
            //line = line.replaceAll();
            //os.write(line.getBytes());
        }
        os.close();
        br.close();
    }
    
    public static void main(String args[])throws IOException{
        System.out.println("\n".trim());
        new T1023("t1023_source.txt").store("t1023.txt");
    }