java 檔案按行讀取

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/*
代碼寫的可能有點累贅
裡面的好多東西寫的不太好 還望各位大佬能提點一二，不勝感激

*/

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) {
//錯誤碼 101 輸入的資訊是否為空白
 return 101;
 }
//判斷檔案夾是否為空白
 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;
 }

                              }

java 檔案按行讀取