java 文件按行读取

Posted 2020-08-22

/*
代码写的可能有点累赘
里面的好多东西写的不太好 还望各位大佬能提点一二，不胜感激

*/

package com.zzp.fileopration;

import java.io.*;

/**
 * Created by hasee on 2016/11/16.
 */
public class ReadFile {

    private BufferedReader br = null;

    public int openFile(String strAddress, String codeFormat) {
        if (strAddress == null || codeFormat == null || strAddress.length() == 0 || codeFormat.length() == 0) {
            //错误代码 101 输入的信息是否为空
            return 101;
        }
        //判断文件夹是否为空
        File file = new File(strAddress);
        if(file.exists() && file.length()==0) {
            return 102;
        }
        try {
            br = new BufferedReader(
                    new InputStreamReader(
                            new FileInputStream(strAddress), codeFormat));
            return 1;
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            return 204;
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            return 201;
        }
    }

    public String readLine() {
        if (br == null) {
            return null;
        }
        try {
            String strReadLine = br.readLine();
            return strReadLine;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }

    }

    public int closeRead() {
        if (br == null) {
            return 301;
        }
        try {
            br.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return 1;
    }
}