JAVA 读取写入文件

读取  写入 文件

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class text6 {
    public static void main(String[] args) {

        System.out.println(fiel_read("file\\a.txt"));


        String str="abcdefg123456";
        file_write("file2","/a.txt",str);

    }

    public static String fiel_read(String dirPath) {  //读取文件
        StringBuffer retstr = new StringBuffer();
        try (FileInputStream fis = new FileInputStream(dirPath);) {
            while (true) {//利用read(byte[])+循环读取文件
                byte[] ss = new byte[1024];
                int n = fis.read(ss);
                if (n == -1) {
                    break;
                }
                for (int i = 0; i < n; i++) {
                    //System.out.println((char)ss[i]);
                    retstr.append((char) ss[i]);
                }
            }
            //fis.close();
        } catch (Exception e) {
            System.out.println(e.toString());
        }
        return retstr.toString();
    }

    public static void file_write(String dirPath,String name,String data) {  //写入文件
        File file = new File(dirPath);
        if (!file.exists() && !file.isDirectory()) {file.mkdirs();}

        try (FileOutputStream fos=new FileOutputStream(dirPath+name,true);){
            fos.write(data.getBytes());
            //fos.close();
        }catch (Exception e){
            System.out.println(e.toString());
        }
    }

}