package com.lky.pojo;import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;import org.junit.After;
import org.junit.Ignore;
import org.junit.Test;/**
* @Title: fileUtil.java
* @Package com.lky.pojo
* @Description: 文件操作的工具类
* @author lky
* @date 2015年10月20日 下午4:21:35
* @version V1.0*/
public class fileUtil {/*** @Title: stringToFile * @Description: 将字符串存入文件(适用于任何类型的数据:图片，音频，视频，文本)* @param  str  待存储的字符串* @param  fname 文件名* @param  flag    是否以追加的方式写入文件*/public void stringToFile(String str, String fname, boolean flag) {FileOutputStream fos = null;File file = new File(fname);try {if (!file.exists()) {String parentName = file.getParent();// 获取父文件夹名new File(parentName).mkdirs();// 创建父文件夹
                file.createNewFile();}fos = new FileOutputStream(file, flag);fos.write(str.getBytes());fos.flush();} catch (Exception e) {e.printStackTrace();} finally {if (fos != null) {try {fos.close();} catch (IOException e) {e.printStackTrace();}}}}/*** @Title: StringToFileBuffered * @Description: 将字符串存入文件(仅在存入的数据为纯文本时，推荐使用，其它类型不使用)* @param  str  待存储的字符串* @param  fname 文件名* @param  flag    是否以追加的方式写入文件*/public void StringToFileBuffered(String str, String fame, boolean flag) {BufferedWriter bw = null;FileWriter fw = null;File file = new File(fame);try {if (!file.exists()) {new File(file.getParent()).mkdirs();file.createNewFile();}fw = new FileWriter(file, flag);bw = new BufferedWriter(fw);bw.write(str);bw.flush();} catch (Exception e) {e.printStackTrace();} finally {try {if (bw != null) {bw.close();}if (fw != null) {fw.close();}} catch (Exception e2) {e2.printStackTrace();}}}/*** @Title: fileToStringBuffered * @Description: 从文件中读入字符串(仅当该文件为文本文件，推荐使用)* @param 文件名*/public String fileToStringBuffered(String fname) {BufferedReader br = null;FileReader fr = null;StringBuffer sBuffer = new StringBuffer();File file = new File(fname);try {if (!file.exists()) {return sBuffer.append(new String("文件不存在")).toString();}fr = new FileReader(file);br = new BufferedReader(fr);String line = null;while ((line = br.readLine()) != null) {sBuffer.append(line+"\r\n");}} catch (Exception e) {e.printStackTrace();} finally {try {if (br != null) {br.close();}if (fr != null) {fr.close();}} catch (Exception e2) {e2.printStackTrace();}}return sBuffer.toString();}/*** @Title: fileToStringBurstMode * @Description: 从文件中读入数据(快字节流方式)* @param 文件名*/public String fileToStringBurstMode(String fname) {File file = new File(fname);FileInputStream fis = null;StringBuffer sBuffer = new StringBuffer();try {if (!file.exists()) {System.out.println("文件不存在。。。。");return sBuffer.toString();}fis = new FileInputStream(file);int length = fis.available();if (length <= 0)return sBuffer.toString();;byte[] buffer = new byte[length];int offset = 0;int toRead = length - offset;while (toRead > 0) {int len = fis.read(buffer, offset, toRead);offset += len;toRead -= len;}sBuffer.append(new String(buffer, "utf-8"));} catch (Exception e) {e.printStackTrace();} finally {if (fis != null) {try {fis.close();} catch (IOException e) {e.printStackTrace();}}}return sBuffer.toString();}/*** @Title: filetoStringSlowMode * @Description: 从文件中读入数据(慢字节流方式)* @param 文件名*/public String filetoStringSlowMode(String fname) {FileInputStream fis = null;ByteArrayOutputStream baos = null;StringBuffer sBuffer = new StringBuffer();File file = new File(fname);try {if (!file.exists()) {return sBuffer.append("该文件不存在").toString();}baos = new ByteArrayOutputStream();fis = new FileInputStream(file);int len = 0;while ((len = fis.read()) != -1) {baos.write(len);}sBuffer.append(baos.toString());} catch (Exception e) {e.printStackTrace();} finally {try {if (fis != null) {fis.close();}if (baos != null) {baos.close();}} catch (Exception e2) {e2.printStackTrace();}}return sBuffer.toString();}@Test@Ignorepublic void test1() {stringToFile("l love you " + "\r\n", "c:\\li\\one.txt", true);}@Afterpublic void testAfter() {System.out.println("---------------------------");}@Test@Ignorepublic void test2() {System.out.println(fileToStringBurstMode("c:\\one.txt"));}@Test@Ignorepublic void test3() {System.out.println(filetoStringSlowMode("c:\\one.txt"));}@Testpublic void test4(){System.out.println(fileToStringBuffered("c:\\zhang\\one.txt"));}@Test@Ignorepublic void test5(){StringToFileBuffered("l love you " + "\r\n", "c:\\zhang\\one.txt", true);}
}