JAVA IO

package com.zhp.method.io;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileReader;import java.io.FileWriter;public class _BufferedStream {public static void main(String[] args) {File file = new File("F:\\eclipse[重要]\\缓冲流的测试.txt");String contain = "姑苏城外寒山寺，夜半钟声到客船。";_Writer(file, contain);System.out.println(_Read(file));_File.delete(file.getAbsolutePath());}/** BufferedReader 缓冲读取流 */public static String _Read(File file) {String s = "";try {/* BufferedReader不仅可以套在FileReader外面,还可以套在InputStreamReader等Reader类外面 */FileReader fr = new FileReader(file);BufferedReader br = new BufferedReader(fr);String tem = null;while ((tem = br.readLine()) != null) {s += tem;}fr.close();br.close();} catch (Exception e) {}return s;}/** BufferedWriter 缓冲写入流 */public static void _Writer(File file, String contain) {// 如果文件不存在，创建文件。if (!file.exists()) {System.out.println("要写入的文件不存在，即将创建...");try {_File.creatFolder(file.getParent());_File.creatFile(file.getAbsolutePath());} catch (Exception e) {System.out.println("　创建文件失败！");}}// 开始写入到文件try {FileWriter fw = new FileWriter(file, true);BufferedWriter bw = new BufferedWriter(fw);bw.write(contain);bw.newLine();bw.flush();bw.close();fw.close();} catch (Exception e) {System.out.println("写入到文件失败！");}}}

package com.zhp.method.io;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;/** 文件字节流 */public class _ByteStream {public static void main(String[] args) {String contain = "This is a test sentence!\n";String fileName = "F:\\eclipse[重要]\\20140310_FileputStreamTest.txt";_File.creatFile(fileName);// 创建文件_FileOutputStream(fileName, contain);// 输出语句到文件byte[] get = _FileInputStream(fileName);// 获得文件内容showByte(get);// 输出获得的内容_File.delete(fileName);// 删除文件}/** FileInputStream 文件字节流获得文件内容 */public static byte[] _FileInputStream(String fileName) {File file = new File(fileName);byte[] tem = new byte[(int) file.length()];try {FileInputStream fis = new FileInputStream(file);fis.read(tem);fis.close();System.out.println("读取文件 " + file.getName() + " 成功！");} catch (Exception e) {}return tem;}/** FileOutputStream 文件字节流添加到开始。 */public static void _FileOutputStream(String fileName, String contain) {byte[] b = contain.getBytes();try {File file = new File(fileName);FileOutputStream fos = new FileOutputStream(file, true);fos.write(b);fos.close();System.out.println("输出到文件 " + file.getName() + " 成功！");} catch (Exception e) {}}/** 输出一个byte[] 的内容 */private static void showByte(byte[] b) {for (byte tem : b) {System.out.print((char) tem);}}}

package com.zhp.method.io;import java.io.File;import java.io.FileReader;import java.io.FileWriter;public class _CharacterStream {public static void main(String[] args) {File file = new File("F:\\eclipse[重要]\\FileReader和FileWriter的测试.txt");String contain = "月落乌啼霜满天\n江枫渔火对愁眠";System.out.println("字符串长度：" + contain.length());_FileWriter(file, contain);System.out.println("读取文件 " + file.getName() + " 为：");System.out.println(_FileReader(file));_File.delete(file.getAbsolutePath());explain();}/** FileReader 文件字符流读取文件 */public static String _FileReader(File file) {if( !file.exists()){System.out.println("没有找到要读取的文件。");return null;}System.out.println("文件长度为：" + file.length());char[] tem = new char[(int) file.length()];try {FileReader fr = new FileReader(file);fr.read(tem);fr.close();} catch (Exception e) {}return new String(tem);}/** FileWriter 文件字符流写入文件, 不会刷新 */public static void _FileWriter(File file, String contain) {if (!file.exists()) {System.out.println("要写入的文件不存在，即将创建...");try {_File.creatFolder(file.getParent());_File.creatFile(file.getAbsolutePath());} catch (Exception e) {System.out.println("　创建文件失败！");}}try {FileWriter fw = new FileWriter(file, true);//附加，为true时不刷新，false刷新。fw.write(contain);fw.flush();fw.close();System.out.println("写入文件完成！");} catch (Exception e) {}}/** 注释 */private static void explain(){System.out.println("---------------------");System.out.println("在file.length() 中，一个汉字的长度是2");System.out.println("在char[] 、String 中，一个汉字的长度是1");System.out.println("---------------------");}}

package com.zhp.method.io;import java.io.BufferedReader;import java.io.File;import java.io.IOException;import java.io.InputStreamReader;public class _File {public static void main(String[] args) {creatFile("F:\\eclipse[重要]\\20140310_FileTest.txt");pause();delete("F:\\eclipse[重要]\\20140310_FileTest.txt");creatFolder("F:\\eclipse[重要]\\testFolder");pause();delete("F:\\eclipse[重要]\\testFolder");startExe("C:\\Windows\\Notepad.exe");}/** 创建文件 */public static void creatFile(String fileName) {File file = new File(fileName);try {file.createNewFile();// must surround by try-catch;System.out.println("_File:创建文件 " + file.getName() + " 成功！");} catch (IOException e) {}}/** 删除文件 */public static void delete(String fileName) {File file = new File(fileName);file.delete();System.out.println("_File:文件已删除");}/** 暂停 */public static void pause() {System.out.println("Input anything to continue.");BufferedReader br = new BufferedReader(new InputStreamReader(System.in));try {@SuppressWarnings("unused")String c = br.readLine();br.reset();br.close();} catch (Exception e) {}}/** 创建目录 */public static void creatFolder(String menuName) {File file = new File(menuName);file.mkdirs();System.out.println("_File:创建目录 " + menuName + " 成功！");}/** 运行可执行文件 */public static void startExe(String appName) {try {Runtime r = Runtime.getRuntime();File file = new File(appName);r.exec(file.getAbsolutePath());} catch (Exception e) {System.out.println("_File:运行可执行文件时出错！");}}}

package com.zhp.method.io;import java.io.BufferedReader;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.util.Scanner;public class _Other {public static void main(String[] args) {System.out.println("由用户自己输入的输入流：");System.out.println("－请输入地址（随便输）");_InputStreamReader1();System.out.println("----------------------");System.out.println("由文件读取的输入流");System.out.println("－从文件中读取的内容是：");_InputStreamReader2();}/** PrintWriter的错误系统不会报告给用户，但仍需要 surround with try / catch */public static void _PrinterWriter(){String s = null;Scanner in = new Scanner(System.in);//输入一个文件地址，这里率随便输入即可s = in.next();try {PrintWriter pw = new PrintWriter( s );pw.close();} catch (FileNotFoundException e) {System.out.println("输入的文件地址有错！");//无论是否有错，这句话都不会输出来。}in.close();}/** 由用户自己输入的输入流 */public static void _InputStreamReader1(){try {InputStreamReader isr = new InputStreamReader(System.in);BufferedReader br = new BufferedReader(isr);System.out.println( br.readLine());} catch (Exception e) {}}/** 由文件读取的输入流 */public static void _InputStreamReader2(){try {FileInputStream fis = new FileInputStream("F:\\eclipse[重要]\\Other.txt");InputStreamReader isr = new InputStreamReader(fis);BufferedReader br =new BufferedReader(isr);String s = null;while((s = br.readLine()) != null){System.out.println(s);}br.close();} catch (Exception e) {System.out.println("有错！");}}}