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cppcppcppcpp
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nio学习
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‎.classpath

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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
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<classpathentry kind="con" path="org.eclipse.jst.server.core.container/org.eclipse.jst.server.tomcat.runtimeTarget/Apache Tomcat v7.0"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>
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<?xml version="1.0" encoding="UTF-8"?>
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<classpath>
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<classpathentry kind="src" path="src"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
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<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
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<classpathentry kind="con" path="org.eclipse.jst.server.core.container/org.eclipse.jst.server.tomcat.runtimeTarget/Apache Tomcat v7.0"/>
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<classpathentry kind="lib" path="E:/maven/repository/mysql/mysql-connector-java/5.1.34/mysql-connector-java-5.1.34.jar"/>
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<classpathentry kind="lib" path="E:/files/jar/httpcomponents-client-4.5.4-bin/httpcomponents-client-4.5.4/lib/httpclient-4.5.4.jar"/>
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<classpathentry kind="lib" path="E:/files/jar/httpcomponents-client-4.5.4-bin/httpcomponents-client-4.5.4/lib/commons-codec-1.10.jar"/>
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<classpathentry kind="lib" path="E:/files/jar/httpcomponents-client-4.5.4-bin/httpcomponents-client-4.5.4/lib/commons-logging-1.2.jar"/>
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<classpathentry kind="lib" path="E:/files/jar/httpcomponents-client-4.5.4-bin/httpcomponents-client-4.5.4/lib/fluent-hc-4.5.4.jar"/>
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<classpathentry kind="lib" path="E:/files/jar/httpcomponents-client-4.5.4-bin/httpcomponents-client-4.5.4/lib/httpclient-cache-4.5.4.jar"/>
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<classpathentry kind="lib" path="E:/files/jar/httpcomponents-client-4.5.4-bin/httpcomponents-client-4.5.4/lib/httpclient-win-4.5.4.jar"/>
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<classpathentry kind="lib" path="E:/files/jar/httpcomponents-client-4.5.4-bin/httpcomponents-client-4.5.4/lib/httpcore-4.4.7.jar"/>
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<classpathentry kind="lib" path="E:/files/jar/httpcomponents-client-4.5.4-bin/httpcomponents-client-4.5.4/lib/httpmime-4.5.4.jar"/>
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<classpathentry kind="lib" path="E:/files/jar/httpcomponents-client-4.5.4-bin/httpcomponents-client-4.5.4/lib/jna-4.4.0.jar"/>
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<classpathentry kind="lib" path="E:/files/jar/httpcomponents-client-4.5.4-bin/httpcomponents-client-4.5.4/lib/jna-platform-4.4.0.jar"/>
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<classpathentry kind="output" path="bin"/>
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</classpath>

‎.settings/org.eclipse.core.resources.prefs

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eclipse.preferences.version=1
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encoding//src/TwoChapter1StreamFile=UTF-8
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encoding/<project>=UTF-8
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eclipse.preferences.version=1
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encoding//src/StreamFile=UTF-8
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encoding/<project>=UTF-8

‎bin/BasicAndDontKnow/Test111.class

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‎bin/BasicAndDontKnow/Test1111.class

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‎bin/Http/.gitignore

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/HttpClientTest.class

‎bin/NIO/SimpleUseOfBuffer.class

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‎bin/NIO/SimpleUserOfChannel.class

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‎bin/NIO/Test.class

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‎bin/TwoChapter1StreamFile/Employee.class renamed to ‎bin/StreamFile/Employee.class

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‎bin/TwoChapter1StreamFile/InputOutputTXT.class renamed to ‎bin/StreamFile/InputOutputTXT.class

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‎bin/TwoChapter1StreamFile/ReadByte.class renamed to ‎bin/StreamFile/ReadByte.class

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‎bin/TwoChapter1StreamFile/Test.class renamed to ‎bin/StreamFile/Test.class

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‎bin/TwoChapter1StreamFile/Test1.class renamed to ‎bin/StreamFile/Test1.class

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‎bin/StreamFile/Test2.class

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‎bin/TwoChapter1StreamFile/TextFileTest.class renamed to ‎bin/StreamFile/TextFileTest.class

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‎bin/TwoChapter1StreamFile/readme.txt renamed to ‎bin/StreamFile/readme.txt

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‎bin/TwoChapter1StreamFile/Test2.class

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‎bin/jdbc/JDBC.class

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‎java_pid14280.hprof

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‎java_pid4076.hprof

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‎readme.txt

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‎src/NIO/SimpleUseOfBuffer.java

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package NIO;
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public class SimpleUseOfBuffer {
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.RandomAccessFile;
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import java.nio.ByteBuffer;
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import java.nio.channels.FileChannel;
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/*
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* 使用Buffer的四个步骤：
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* （声明buffer，绑定到通道）
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* 1.写数据到Buffer
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* ---a. int bytesRead=inChannel.read(buf)//read into buf
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* ---b. buf.read(123);
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* 2.调用buffer.flip()//从写模式切换到度模式
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* --- 即将limit=position position=0
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* 3.从buffer中读数据
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* ---a. int bytesWrite=inChannel.write(buf)//从buf中读数据到channel
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* ---b. buf.get()
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* 4.调用buffer.clear()或者buffer.compact()
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* ---buf.clear():positon=0,limit=capacity “忘记”哪些数据读过，哪些没有
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* ---buf.compact():将未读过的数据都放在开头，position=最后一个数据后面
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*
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* buf.rewind():position=0,limit不变，你可以重读buf中的所有数据
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*
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* buf.mark():mark=positon:标记position
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* buf.reset():position=mark:重新回到之前的position
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*
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*
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*
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* 其他几个基本函数：
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* buf.equals():比较剩余的值是否相等
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* ------ByteBuffer.equals()
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* p=postion;
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* for(int i=this.limit-1,int j=that.limit-1;i>=p;i--,j--)
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* buf.compare():
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* ------ByteBuffer.compareTo():
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* n=positon+Math.min(this.remain,that.remain)
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* //在剩余的值中
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* for(i=this.position,j=that.position;i<n;i++)
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* //如果谁的值大，谁就大
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* int temp=if(compare(this.get(i),that.get(i)))
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* if(temp!=0)
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* return temp;
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* //如果剩余值都相同，谁数据多谁就大
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* return this.remain-that.remain;
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* */
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public class SimpleUseOfBuffer {
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public static void main(String[] args){
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try {
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RandomAccessFile randomFile;
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randomFile = new RandomAccessFile("src\\employee.txt", "rw");
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FileChannel inChannel= randomFile.getChannel();
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ByteBuffer byteBuffer=ByteBuffer.allocate(10);
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//从通道中读一组字节序列到缓存中
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int bytesRead=inChannel.read(byteBuffer);
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while(bytesRead!=-1) {
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System.out.println("Read"+bytesRead);
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//从buffer中读取数据
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byteBuffer.flip();
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while(byteBuffer.hasRemaining()) {
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System.out.println("buf:"+(char)byteBuffer.get());//从buf中取数据
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}
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byteBuffer.clear();
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bytesRead=inChannel.read(byteBuffer);
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}
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randomFile.close();
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} catch (FileNotFoundException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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} catch (IOException e) {
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// TODO Auto-generated catch block
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e.printStackTrace();
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}
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}
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}

‎src/TwoChapter1StreamFile/Test.class renamed to ‎src/StreamFile/Test.class

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‎src/StreamFile/Test2.java

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package StreamFile;
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public class Test2 {
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public static void main(String[] args){
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System.out.println("Test2");
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Test test= new Test();
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String[] a=null;
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test.main(a);
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}
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}
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class Test1{
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public static void main(String[] args) {
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System.out.println("Test1");
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System.out.println(args.length);
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}
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}

‎src/TwoChapter1StreamFile/readme.txt renamed to ‎src/StreamFile/readme.txt

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