java以字符流的形式清洗超大文本

Question

我用 BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File("D:\ccc.txt")),"UTF-8"));
BufferedInputStream inputStream = new BufferedInputStream(new FileInputStream(file));
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream),5*1024*1024);方式清洗大约2G的文本，也是会包内存不足
上面是清洗之前的
下面是清洗之后的
问了其他人，说字符流可以实现，要怎么实现，麻烦详细些，谢谢

Answer 1

楼主试试

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

public class QingXi {
    public static void main(String[]args) throws FileNotFoundException, IOException{

        String pathRead = "D:/test_input.txt";
        String pathWrite = "D:/test_output.txt";

        FileReader fr = new FileReader(pathRead);
        FileWriter fw = new FileWriter(pathWrite);

        BufferedReader br = new BufferedReader(fr);
        BufferedWriter wr = new BufferedWriter(fw);

        String line = br.readLine();
        while(line != null){
            String str = line.replaceAll("---", ",");
            wr.append(str);
            wr.append("\n");

            line = br.readLine();
        }
        wr.flush();

        wr.close();
        br.close();
        fw.close();
        fr.close();
    }
}