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初学nio
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15 files changed

+572
-394
lines changed

15 files changed

+572
-394
lines changed

‎bin/transaction/TransferAccountTransaction.class

314 Bytes
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‎employee.txt

Whitespace-only changes.

‎employee1.txt

Whitespace-only changes.

‎src/BasicAndDontKnow/Test111.java

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package BasicAndDontKnow;
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public class Test111 {
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public static void main(String[] args) {
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Integer a = 128, b = 128;
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System.out.println(a == b);
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}
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}

‎src/BasicAndDontKnow/Test1111.java

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package BasicAndDontKnow;
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public class Test1111 {
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public static int a = 5;
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static {
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a = a * 3;
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}
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public static void main(String[] args) {
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System.out.println(a);
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}
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static {
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a = a / 3;
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}
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}

‎src/Http/HttpClientTest.java

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package Http;
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import java.util.ArrayList;
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import java.util.List;
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import org.apache.http.HttpEntity;
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import org.apache.http.NameValuePair;
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import org.apache.http.client.entity.UrlEncodedFormEntity;
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import org.apache.http.client.methods.CloseableHttpResponse;
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import org.apache.http.client.methods.HttpGet;
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import org.apache.http.client.methods.HttpPost;
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import org.apache.http.impl.client.CloseableHttpClient;
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import org.apache.http.impl.client.HttpClients;
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import org.apache.http.message.BasicNameValuePair;
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import org.apache.http.util.EntityUtils;
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public class HttpClientTest {
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public static void main(String[] args) throws Exception {
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CloseableHttpClient httpclient = HttpClients.createDefault();
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try {
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HttpGet httpGet = new HttpGet("http://httpbin.org/get");
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CloseableHttpResponse response1 = httpclient.execute(httpGet);
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// The underlying HTTP connection is still held by the response object
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// to allow the response content to be streamed directly from the network socket.
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// In order to ensure correct deallocation of system resources
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// the user MUST call CloseableHttpResponse#close() from a finally clause.
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// Please note that if response content is not fully consumed the underlying
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// connection cannot be safely re-used and will be shut down and discarded
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// by the connection manager.
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try {
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System.out.println(response1.getStatusLine());
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HttpEntity entity1 = response1.getEntity();
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// do something useful with the response body
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// and ensure it is fully consumed
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EntityUtils.consume(entity1);
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} finally {
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response1.close();
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}
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HttpPost httpPost = new HttpPost("http://httpbin.org/post");
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List <NameValuePair> nvps = new ArrayList <NameValuePair>();
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nvps.add(new BasicNameValuePair("username", "vip"));
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nvps.add(new BasicNameValuePair("password", "secret"));
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httpPost.setEntity(new UrlEncodedFormEntity(nvps));
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CloseableHttpResponse response2 = httpclient.execute(httpPost);
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try {
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System.out.println(response2.getStatusLine());
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HttpEntity entity2 = response2.getEntity();
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// do something useful with the response body
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// and ensure it is fully consumed
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EntityUtils.consume(entity2);
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} finally {
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response2.close();
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}
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} finally {
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httpclient.close();
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}
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}
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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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}

‎src/NIO/SimpleUserOfChannel.java

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package NIO;
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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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public class SimpleUserOfChannel {
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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());
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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/NIO/Test.java

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package NIO;
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import java.io.IOException;
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import java.net.InetSocketAddress;
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import java.nio.ByteBuffer;
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import java.nio.channels.SelectionKey;
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import java.nio.channels.Selector;
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import java.nio.channels.ServerSocketChannel;
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import java.nio.channels.SocketChannel;
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import java.util.Iterator;
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import java.util.Set;
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public class Test {
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public void selector() throws IOException {
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ByteBuffer buffer=ByteBuffer.allocate(1024);
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Selector selector=Selector.open();
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ServerSocketChannel serverSocketChannel=ServerSocketChannel.open();
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serverSocketChannel.configureBlocking(false);//设为非阻塞方式
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serverSocketChannel.socket().bind(new InetSocketAddress(8080));
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serverSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
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while(true) {
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Set selectedKeys=selector.selectedKeys();
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Iterator iterator=selectedKeys.iterator();
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while(iterator.hasNext()) {
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SelectionKey key=(SelectionKey) iterator.next();
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if((key.readyOps()&SelectionKey.OP_ACCEPT)==SelectionKey.OP_ACCEPT) {
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ServerSocketChannel ssChannel=(ServerSocketChannel) key.channel();
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SocketChannel sc=ssChannel.accept();
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sc.configureBlocking(false);
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sc.register(selector, SelectionKey.OP_READ);
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iterator.remove();
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}else if((key.readyOps() & SelectionKey.OP_ACCEPT)==SelectionKey.OP_READ) {
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SocketChannel sc=(SocketChannel) key.channel();
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while(true) {
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buffer.clear();
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int n=sc.read(buffer);
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if(n<=0) {
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break;
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}
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buffer.flip();
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}
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iterator.remove();
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}
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}
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}
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}
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public static void main(String[] args) {
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}
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}

‎src/TwoChapter1StreamFile/InputOutputTXT.java renamed to ‎src/StreamFile/InputOutputTXT.java

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package TwoChapter1StreamFile;
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import java.io.Closeable;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.util.Scanner;
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public class InputOutputTXT implements Closeable{
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/*
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* 1.输出文本到文件
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* 2.读文本
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*
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* */
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public static void main(String[] args) {
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//try-with-catch--语法糖
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try( Scanner in=new Scanner(new FileInputStream("src\\readme.txt"));
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PrintWriter out= new PrintWriter("src\\readme.txt")){
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//PrintWriter out=new PrintWriter(new FileWriter("readme.txt"),true);
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//是上面写法的简写，true代表自动刷新
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//打印到写出器
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out.println("name");
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out.print("password");
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out.println(100);
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out.flush();
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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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}
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}
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@Override
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public void close() throws IOException {
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// TODO Auto-generated method stub
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System.out.println("关闭输入/输出流");
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}
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}
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package StreamFile;
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import java.io.Closeable;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.util.Scanner;
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public class InputOutputTXT implements Closeable{
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/*
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* 1.����ı����ļ�
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* 2.���ı�
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*
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* */
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public static void main(String[] args) {
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//try-with-catch--�﷨��
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try( Scanner in=new Scanner(new FileInputStream("src\\readme.txt"));
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PrintWriter out= new PrintWriter("src\\readme.txt")){
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//PrintWriter out=new PrintWriter(new FileWriter("readme.txt"),true);
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//������д���ļ�д��true�����Զ�ˢ��
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//��ӡ��д����
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out.println("name");
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out.print("password");
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out.println(100);
27+
out.flush();
28+
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} catch (FileNotFoundException e) {
30+
// TODO Auto-generated catch block
31+
e.printStackTrace();
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}
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}
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@Override
36+
public void close() throws IOException {
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// TODO Auto-generated method stub
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System.out.println("�ر�����/�����");
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}
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}

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