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OneCodeOneTimeOneCodeOneTime
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Chapter 18 IO/NIO btp170802
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‎.settings/org.eclipse.core.resources.prefs‎

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eclipse.preferences.version=1
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encoding//src/btp/oneP/BufferToText.java=UTF-8

‎src/Data/IO.jpg‎

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‎src/btp/oneP/AvailableCharSets.java‎

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package btp.oneP;
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import java.nio.charset.Charset;
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import java.util.Iterator;
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import java.util.SortedMap;
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public class AvailableCharSets {
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public static void main(String[] args) {
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SortedMap<String,Charset> charSets = Charset.availableCharsets();
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Iterator<String> it = charSets.keySet().iterator();
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while(it.hasNext()){
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String csName = it.next();
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System.out.print(csName);
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Iterator aliases = charSets.get(csName).aliases().iterator();
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if(aliases.hasNext()){
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System.out.print(": ");
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}
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while(aliases.hasNext()){
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System.out.print(aliases.next());
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if(aliases.hasNext()){
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System.out.print(", ");
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}
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}
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System.out.println();
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}
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}
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}

‎src/btp/oneP/BasicFileOutput.java‎

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package btp.oneP;
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import java.io.BufferedReader;
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import java.io.BufferedWriter;
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import java.io.FileWriter;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.io.StringReader;
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public class BasicFileOutput {
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static String file = "C:\\Users\\dell\\Desktop\\IO\\io.txt";
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public static void main(String[] args) throws IOException {
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BufferedReader in = new BufferedReader(new StringReader(BufferedInputFile.read("E:\\workspaces\\NewWork\\Study\\src\\btp\\oneP\\BasicFileOutput.java")));
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PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(file)));
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int lineCount = 1;
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String s;
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while((s = in.readLine()) != null){
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out.println(lineCount++ + " : " + s);
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}
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out.close();
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System.out.println(BufferedInputFile.read(file));
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}
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}

‎src/btp/oneP/BinaryFile.java‎

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package btp.oneP;
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import java.io.BufferedInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.util.HashMap;
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import java.util.Map;
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public class BinaryFile {
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public static byte[] read(File bFile) throws IOException{
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BufferedInputStream bf = new BufferedInputStream(new FileInputStream(bFile));
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try{
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byte[] data = new byte[bf.available()];
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bf.read(data);
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return data;
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}finally{
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bf.close();
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}
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}
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public static byte[] read(String bFile) throws IOException{
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return read(new File(bFile).getAbsoluteFile());
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}
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public static void main(String[] args) throws IOException {
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byte[] bytes = read("E:\\workspaces\\NewWork\\Study\\src\\btp\\oneP\\BinaryFile.java");
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Map<Byte,Integer> map = new HashMap<Byte,Integer>();
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for(byte b : bytes){
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if(null == map.get(b)){
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map.put(b, 1);
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}else{
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map.put(b, map.get(b)+1);
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}
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}
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System.out.println(map);
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}
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}

‎src/btp/oneP/BufferToText.java‎

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package btp.oneP;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.nio.channels.FileChannel;
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import java.nio.charset.Charset;
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public class BufferToText {
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private static final int BSIZE = 1024;
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public static void main(String[] args) throws IOException {
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FileChannel fc = new FileOutputStream("C:\\Users\\dell\\Desktop\\IO\\data2.txt").getChannel();
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fc.write(ByteBuffer.wrap("some text".getBytes()));
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fc.close();
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fc = new FileInputStream("C:\\Users\\dell\\Desktop\\IO\\data2.txt").getChannel();
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ByteBuffer buff = ByteBuffer.allocate(BSIZE);
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fc.read(buff);
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buff.flip();
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System.out.println(buff.asCharBuffer());
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buff.rewind();
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String encoding = System.getProperty("file.encoding");
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System.out.println("Decoded using "+encoding+":"+Charset.forName(encoding).decode(buff));
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fc = new FileOutputStream("C:\\Users\\dell\\Desktop\\IO\\data2.txt").getChannel();
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fc.write(ByteBuffer.wrap("Some text".getBytes("GBK")));
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fc.close();
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fc = new FileInputStream("C:\\Users\\dell\\Desktop\\IO\\data2.txt").getChannel();
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buff.clear();
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fc.read(buff);
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buff.flip();
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System.out.println(buff.asCharBuffer());
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System.out.println("Decoded using "+"GBK"+":"+Charset.forName("GBK").decode(buff));
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fc = new FileOutputStream("C:\\Users\\dell\\Desktop\\IO\\data2.txt").getChannel();
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buff = ByteBuffer.allocate(24);
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buff.asCharBuffer().put("Some text!");
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fc.write(buff);
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fc.close();
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fc = new FileInputStream("C:\\Users\\dell\\Desktop\\IO\\data2.txt").getChannel();
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buff.clear();
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fc.read(buff);
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buff.flip();
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System.out.println(buff.asCharBuffer());
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}
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}

‎src/btp/oneP/BufferedInputFile.java‎

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package btp.oneP;
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import java.io.BufferedReader;
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import java.io.FileReader;
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import java.io.IOException;
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public class BufferedInputFile {
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public static String read(String filename) throws IOException{
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BufferedReader im = new BufferedReader(new FileReader(filename));
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String s;
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StringBuilder sb = new StringBuilder();
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while((s = im.readLine()) != null){
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sb.append(s+"\n");
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}
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im.close();
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return sb.toString();
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}
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public static void main(String[] args) throws IOException {
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System.out.println(read("E:\\workspaces\\NewWork\\Study\\src\\btp\\oneP\\BufferedInputFile.java"));
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}
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}

‎src/btp/oneP/ChangeSystemOut.java‎

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package btp.oneP;
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import java.io.PrintWriter;
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public class ChangeSystemOut {
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public static void main(String[] args) {
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// TODO Auto-generated method stub
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//PrintWriter有接受OutputStream的构造器，将其用OutputStreamWriter转换为Writer
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PrintWriter out = new PrintWriter(System.out,true);
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out.println("Hello,world");
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}
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}

‎src/btp/oneP/ChannelCopy.java‎

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package btp.oneP;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.nio.channels.FileChannel;
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public class ChannelCopy {
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private static final int BSIZE = 1024;
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public static void main(String[] args) throws IOException {
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FileChannel in = new FileInputStream("C:\\Users\\dell\\Desktop\\IO\\channelIn.txt").getChannel(),
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out = new FileOutputStream("C:\\Users\\dell\\Desktop\\IO\\channelOut.txt").getChannel();
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ByteBuffer buffer = ByteBuffer.allocate(BSIZE);
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while(in.read(buffer) != -1){
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//写完之后：limit = capacity;position = 实际数据大小
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buffer.flip();//limit->position;position->0
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out.write(buffer);
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buffer.clear();//limit->capacity;position->0;准备下一路的读
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}
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}
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}

‎src/btp/oneP/DirList.java‎

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package btp.oneP;
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import java.io.File;
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import java.io.FilenameFilter;
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import java.util.Arrays;
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import java.util.regex.Pattern;
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public class DirList {
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public static void main(String[] args) {
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File path = new File("E:\\workspaces\\NewWork\\Study\\src\\btp\\oneP");
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String[] list;
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if(args.length == 0){
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list = path.list();
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}else{
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list = path.list(new DirFilter(args[0]));
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}
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Arrays.sort(list, String.CASE_INSENSITIVE_ORDER);
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for(String dirItem : list){
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System.out.println(dirItem);
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}
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}
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}
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class DirFilter implements FilenameFilter{
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private Pattern pattern;
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public DirFilter(String regex){
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pattern = Pattern.compile(regex);
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}
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@Override
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public boolean accept(File dir, String name) {
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// TODO Auto-generated method stub
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return false;
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}
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}

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