Merge pull request #22 from yanghaitao0410/master

第三周

group06/1454385822/src/com/coding/basic/homework_02/litestruts/Struts.java

@@ -42,11 +42,10 @@ public static View runAction(String actionName, Map<String, String> params) thro
 		放到View对象的jsp字段中。
         
         */
-
-    	View view = new View();
 		Element root = getRoot();
 		Class clazz = getClazz(actionName, root);
 		Object obj = clazz.newInstance();
+		View view = new View();
 
 		methodInvoke(clazz, obj, params);
 		String result = getExecuteInfo(clazz, obj);

group06/1454385822/src/com/coding/basic/homework_03/download/DownloadThread.java

@@ -0,0 +1,50 @@
+package com.coding.basic.homework_03.download;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+
+import com.coding.basic.homework_03.download.api.Connection;
+
+public class DownloadThread extends Thread{
+
+	Connection conn;
+	int startPos;
+	int endPos;
+	boolean downOver = false;
+
+	public DownloadThread( Connection conn, int startPos, int endPos){
+
+		this.conn = conn;		
+		this.startPos = startPos;
+		this.endPos = endPos;
+	}
+	public void run(){	
+		RandomAccessFile raf = null;
+		try {
+//			System.out.println(Thread.currentThread().getName() + "开始下载...");
+			byte[] bytes = conn.read(startPos, endPos);
+
+//			if(!file.exists()){
+//				file.createNewFile();
+//			}
+			synchronized(this){
+				File file = new File("copy.jpg");
+				raf = new RandomAccessFile(file,"rw");
+				raf.seek(startPos);
+				raf.write(bytes);
+			}
+		} catch (IOException e) {
+			e.printStackTrace();
+		}finally{
+			if(raf != null){
+				try {
+					raf.close();
+					downOver = true;
+				} catch (IOException e) {
+					e.printStackTrace();
+				}
+			}
+		}
+	}
+}

group06/1454385822/src/com/coding/basic/homework_03/download/FileDownloader.java

@@ -0,0 +1,130 @@
+package com.coding.basic.homework_03.download;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+
+import com.coding.basic.homework_03.download.api.Connection;
+import com.coding.basic.homework_03.download.api.ConnectionManager;
+import com.coding.basic.homework_03.download.api.DownloadListener;
+
+public class FileDownloader {
+
+	String url;
+
+	DownloadListener listener;
+
+	ConnectionManager cm;
+	private static final long KBSIZE = 1024;
+	private static final long MBSIZE = 1024 * 1024;
+
+	public FileDownloader(String _url) {
+		this.url = _url;
+
+	}
+
+	public void execute() throws IOException {
+		// 在这里实现你的代码， 注意： 需要用多线程实现下载
+		// 这个类依赖于其他几个接口, 你需要写这几个接口的实现代码
+		// (1) ConnectionManager , 可以打开一个连接，通过Connection可以读取其中的一段（用startPos,
+		// endPos来指定）
+		// (2) DownloadListener, 由于是多线程下载， 调用这个类的客户端不知道什么时候结束，所以你需要实现当所有
+		// 线程都执行完以后， 调用listener的notifiedFinished方法， 这样客户端就能收到通知。
+		// 具体的实现思路：
+		// 1. 需要调用ConnectionManager的open方法打开连接，
+		// 然后通过Connection.getContentLength方法获得文件的长度
+		// 2. 至少启动3个线程下载， 注意每个线程需要先调用ConnectionManager的open方法
+		// 然后调用read方法， read方法中有读取文件的开始位置和结束位置的参数， 返回值是byte[]数组
+		// 3. 把byte数组写入到文件中
+		// 4. 所有的线程都下载完成以后， 需要调用listener的notifiedFinished方法
+
+		// 下面的代码是示例代码， 也就是说只有一个线程， 你需要改造成多线程的。
+		Connection conn = null;
+		try {
+			conn = cm.open(this.url);
+			int length = conn.getContentLength();
+			createFile(new File("copy.jpg"), length);
+//			System.out.println(length);
+			int len = length / 5;
+			DownloadThread t1 = new DownloadThread(cm.open(this.url), 0, len - 1);
+			DownloadThread t2 = new DownloadThread(cm.open(this.url), len, len * 2 - 1);
+			DownloadThread t3 = new DownloadThread(cm.open(this.url), len * 2, len * 3 - 1);
+			DownloadThread t4 = new DownloadThread(cm.open(this.url), len * 3, len * 4 - 1);
+			DownloadThread t5 = new DownloadThread(cm.open(this.url), len * 4, len * 5 - 1);
+			DownloadThread t6 = new DownloadThread(cm.open(this.url), len * 5, length - 1);
+			t1.start();
+			t2.start();
+			t3.start();
+			t4.start();
+			t5.start();
+			t6.start();
+
+			while (!(t1.downOver && t2.downOver && t3.downOver && t4.downOver && t5.downOver && t6.downOver)) {
+				try {
+					System.out.println("还有线程没有下载完成，等待五秒...");
+					// 休眠5秒
+					Thread.sleep(5000);
+				} catch (Exception e) {
+					e.printStackTrace();
+				}
+			}
+
+		} catch (Exception e) {
+			e.printStackTrace();
+		} finally {
+			if (conn != null) {
+				conn.close();
+			}
+		}
+
+	}
+
+	/**
+	 * 创建一个临时文件
+	 * 
+	 * @param file
+	 * @param length
+	 * @throws IOException
+	 */
+	private void createFile(File file, int length) throws IOException {
+		long batchSize = 0;
+		FileOutputStream fos = null;
+		if (!file.exists()) {
+			file.createNewFile();
+		}
+
+		if (length > KBSIZE) {
+			batchSize = KBSIZE;
+		}
+		if (length > MBSIZE) {
+			batchSize = MBSIZE;
+		}
+		fos = new FileOutputStream(file);
+		int times = length / (int) batchSize;
+		int last = length % (int) batchSize;
+		FileChannel channel = fos.getChannel();
+		for (int i = 0; i < times; i++) {
+			ByteBuffer buffer = ByteBuffer.allocate((int) batchSize);
+			channel.write(buffer);
+		}
+		ByteBuffer buffer = ByteBuffer.allocate(last);
+		channel.write(buffer);
+		fos.close();
+
+	}
+
+	public void setListener(DownloadListener listener) {
+		this.listener = listener;
+	}
+
+	public void setConnectionManager(ConnectionManager ucm) {
+		this.cm = ucm;
+	}
+
+	public DownloadListener getListener() {
+		return this.listener;
+	}
+
+}

group06/1454385822/src/com/coding/basic/homework_03/download/FileDownloaderTest.java

@@ -0,0 +1,57 @@
+package com.coding.basic.homework_03.download;
+
+import java.io.IOException;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import com.coding.basic.homework_03.download.api.ConnectionManager;
+import com.coding.basic.homework_03.download.impl.ConnectionManagerImpl;
+
+public class FileDownloaderTest {
+	boolean downloadFinished = false;
+	@Before
+	public void setUp() throws Exception {
+	}
+
+	@After
+	public void tearDown() throws Exception {
+	}
+
+	@Test
+	public void testDownload() throws IOException {
+
+		String url = "http://bpic.588ku.com/element_origin_min_pic/16/12/01/b4365c64e8a567afd0ab63285515de55.jpg";
+
+		FileDownloader downloader = new FileDownloader(url);
+		ConnectionManager cm = new ConnectionManagerImpl();
+		downloader.setConnectionManager(cm);
+		downloader.execute();
+
+//		downloader.setListener(new DownloadListener() {
+//			@Override
+//			public void notifyFinished() {
+//				downloadFinished = true;
+//			}
+//		});
+
+
+		// 等待多线程下载程序执行完毕
+//		while (!downloadFinished) {
+//			try {
+////				System.out.println(Thread.currentThread().getName());
+//				System.out.println("还没有下载完成，休眠五秒");
+//				//休眠5秒
+////				Thread.sleep(1000);
+//			} catch (Exception e) {				
+//				e.printStackTrace();
+//			}
+//		}
+		System.out.println("下载完成！文件存放在此项目根目录下");
+
+
+
+	}
+
+}

group06/1454385822/src/com/coding/basic/homework_03/download/api/Connection.java

@@ -0,0 +1,26 @@
+package com.coding.basic.homework_03.download.api;
+
+import java.io.IOException;
+
+public interface Connection {
+
+	/**
+	 * 给定开始和结束位置， 读取数据， 返回值是字节数组
+	 * @param startPos 开始位置， 从0开始
+	 * @param endPos 结束位置
+	 * @return
+	 */
+	public byte[] read(int startPos,int endPos) throws IOException;
+	/**
+	 * 得到数据内容的长度
+	 * @return
+	 * @throws IOException 
+	 */
+	public int getContentLength() throws IOException;
+
+	/**
+	 * 关闭连接
+	 * @throws IOException 
+	 */
+	public void close() throws IOException;
+}

group06/1454385822/src/com/coding/basic/homework_03/download/api/ConnectionException.java

@@ -0,0 +1,5 @@
+package com.coding.basic.homework_03.download.api;
+
+public class ConnectionException extends Exception {
+
+}

group06/1454385822/src/com/coding/basic/homework_03/download/api/ConnectionManager.java

@@ -0,0 +1,16 @@
+package com.coding.basic.homework_03.download.api;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+public interface ConnectionManager {
+	/**
+	 * 给定一个url , 打开一个连接
+	 * @param url
+	 * @return
+	 * @throws FileNotFoundException 
+	 * @throws IOException 
+	 */
+	public Connection open(String url) throws IOException;	
+}
+

group06/1454385822/src/com/coding/basic/homework_03/download/api/DownloadListener.java

@@ -0,0 +1,5 @@
+package com.coding.basic.homework_03.download.api;
+
+public interface DownloadListener {
+	public void notifyFinished();
+}

group06/1454385822/src/com/coding/basic/homework_03/download/impl/ConnectionImpl.java

@@ -0,0 +1,75 @@
+package com.coding.basic.homework_03.download.impl;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+
+import com.coding.basic.homework_03.download.api.Connection;
+
+public class ConnectionImpl implements Connection{
+//	public RandomAccessFile raf = null;
+	public HttpURLConnection httpUrl = null;
+	public URL Url = null;
+//	public BufferedInputStream bis = null;
+//	FileInputStream fis = null;
+	InputStream is = null;
+	public ConnectionImpl(String url) throws IOException{
+
+		Url = new URL(url);
+		httpUrl = (HttpURLConnection) Url.openConnection();
+		httpUrl.connect();
+		is = httpUrl.getInputStream();
+
+//		fis = (FileInputStream) httpUrl.getInputStream();
+//		bis = new BufferedInputStream(httpUrl.getInputStream());
+//		raf = new RandomAccessFile(url, "r");
+	}
+
+	@Override
+	public byte[] read(int startPos, int endPos) throws IOException {
+		int length = endPos - startPos + 1;
+		byte[] result = new byte[length];
+		int num = 0;
+		if(startPos != 0){
+			is.skip(startPos);
+		}	
+		num = (int)is.read(result);
+//		System.out.println("length : " + length);
+//		System.out.println("num : " + num);
+
+//		System.out.println(startPos +"....读到了...."+endPos);
+//		
+//		System.out.println(Integer.MAX_VALUE);
+//		System.out.println("num:" + num);
+//		fis.skip(startPos);
+//		fis.read(result, startPos, length);
+//		bis.read(result, startPos, length);
+
+//		raf.seek(startPos);
+//		raf.read(result);
+		return result;
+	}
+
+	@Override
+	public int getContentLength() throws IOException {
+		int num = 0;
+		return httpUrl.getContentLength();
+//		return (int) raf.length();
+	}
+
+	@Override
+	public void close() throws IOException {
+//		if(raf != null){
+//			raf.close();
+//		}
+//		if(bis != null){
+//			bis.close();
+//		}
+		if(is != null){
+			is.close();
+		}
+
+	}
+
+}