Android 程序私有文件（TXT）操作类

来源：互联网发布：明基显示器知乎编辑：程序博客网时间：2024/05/25 05:38

package com.ltc.datastorage.text;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;

import android.content.Context;

/**
* Android私有TXT文件操作类
* @author LTC
*
*/
public class TextManager {

        private Context context;
        private String fileName;

        /**
         * 构造函数
         * @param context
         * @param fileName
         */
        public TextManager(Context context, String fileName){
                this.context = context;
                this.fileName = fileName;
        }

        /**
         * 判断文件是否存在
         * @return
         */
        public boolean isExist(){
                String [] fileNameArray = context.fileList();
                for(int i = 0; i< fileNameArray.length; i++){
                        if(fileNameArray[i].equals(fileName)){
                                return true;
                        }
                }
                return false;
        }

        /**
         * 创建文件
         * @return
         */
        public boolean create(){
                boolean result = false;
                if(!isExist()){
                        FileOutputStream fos = null;
                        try {
                                fos = context.openFileOutput(fileName, Context.MODE_PRIVATE);
                        } catch (FileNotFoundException e) {
                                e.printStackTrace();
                        }
                        if(fos != null){
                                result = true;
                                try {
                                        fos.close();
                                } catch (IOException e) {
                                        e.printStackTrace();
                                }
                        }
                }
                return result;
        }

        /**
         * 写入
         * @param str
         * @return
         */
        public boolean write(String str){
                boolean result = true;
                FileOutputStream fos = null;

                if(isExist()){
                        try {
                                fos = context.openFileOutput(fileName, Context.MODE_APPEND);
                        } catch (FileNotFoundException e) {
                                e.printStackTrace();
                                result = false;
                        }

                        byte bt [] = (str+"\n").getBytes();

                        if(fos != null){
                                try {
                                        fos.write(bt);
                                } catch (IOException e) {
                                        e.printStackTrace();
                                        result = false;
                                }
                                try{
                                        fos.close();
                                }catch (Exception e) {
                                        e.printStackTrace();
                                        result = false;
                                }
                        }
                }

                return result;
        }

        /**
         * 读取一行
         * @return
         */
        public String readLine(){

                String str = "";
                FileInputStream fis = null;

                if(isExist()){
                        try {
                                fis = context.openFileInput(fileName);
                        } catch (FileNotFoundException e) {
                                e.printStackTrace();
                        }

                        BufferedReader br = new BufferedReader(new InputStreamReader(fis));

                        try {
                                str = br.readLine();
                                fis.close();
                        } catch (IOException e) {
                                e.printStackTrace();
                        }
                }
                return str;
        }

        /**
         * 读取全部
         * @return
         */
        public String read(){
                String str = "";
                String line = "";
                FileInputStream fis = null;

                if(isExist()){
                        try {
                                fis = context.openFileInput(fileName);
                        } catch (FileNotFoundException e) {
                                e.printStackTrace();
                        }

                        BufferedReader br = new BufferedReader(new InputStreamReader(fis));

                        try {
                                while((line = br.readLine()) != null){
                                        str += line;
                                }
                                fis.close();
                        } catch (IOException e) {
                                e.printStackTrace();
                        }
                }

                return str;
        }

        /**
         * 清空文件
         */
        public void clean(){
                delete();
                create();
        }

        /**
         * 删除文件
         */
        public void delete(){
                context.deleteFile(fileName);
        }
}

转自:http://www.eoeandroid.com/thread-70490-1-1.html