Merge remote-tracking branch 'upstream/master'

group02/1554421063/src/com/github/FelixCJF/coding2017/coderising/download/DownloadThread.java

@@ -0,0 +1,37 @@
+package com.github.FelixCJF.coding2017.coderising.download;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+
+import com.github.FelixCJF.coding2017.coderising.download.api.Connection;
+
+public class DownloadThread extends Thread{
+
+	Connection conn;
+	int startPos;
+	int endPos;
+
+	public DownloadThread( Connection conn, int startPos, int endPos){
+
+		this.conn = conn;		
+		this.startPos = startPos;
+		this.endPos = endPos;
+	}
+	public void run(){	
+		System.out.println("下载开始");
+		try {
+			byte[] buff = conn.read(startPos, endPos);
+			//创建一个可随机写入文件
+			RandomAccessFile randomAccessFile = new RandomAccessFile(new File("G:/"), "rwd");
+			randomAccessFile.seek(startPos);
+			randomAccessFile.write(buff, 0, buff.length);
+			randomAccessFile.close();
+
+			System.out.println("下载结束");
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+
+	}
+}

group02/1554421063/src/com/github/FelixCJF/coding2017/coderising/download/FileDownloader.java

@@ -0,0 +1,87 @@
+package com.github.FelixCJF.coding2017.coderising.download;
+
+import com.github.FelixCJF.coding2017.coderising.download.api.Connection;
+import com.github.FelixCJF.coding2017.coderising.download.api.ConnectionException;
+import com.github.FelixCJF.coding2017.coderising.download.api.ConnectionManager;
+import com.github.FelixCJF.coding2017.coderising.download.api.DownloadListener;
+
+public class FileDownloader {
+
+	String url;
+
+	DownloadListener listener;
+
+	ConnectionManager cm;
+
+
+	public FileDownloader(String _url) {
+		this.url = _url;
+
+	}
+
+	public void execute(){
+		// 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();	
+			//自定义线程数量
+			int threadCount = 3;
+			//计算每条线程下载数据的大小
+			int blockSize = length/threadCount;
+
+			for (int threadId = 0; threadId <= threadCount; threadCount++) {
+
+				//定义每个线程开始以及结束的下载位置
+				// 开始下载的位置
+				int startPos = (threadId - 1) * blockSize;
+				// 结束下载的位置（不包含最后一块）
+				int endPos = (threadId * blockSize) - 1;
+				if (threadCount == threadId) {
+					endPos = length;
+				}
+				new DownloadThread(conn,0,length-1).start();
+			}
+
+
+		} catch (ConnectionException e) {			
+			e.printStackTrace();
+		}finally{
+			if(conn != null){
+				conn.close();
+			}
+		}
+
+
+
+
+	}
+
+	public void setListener(DownloadListener listener) {
+		this.listener = listener;
+	}
+
+
+
+	public void setConnectionManager(ConnectionManager ucm){
+		this.cm = ucm;
+	}
+
+	public DownloadListener getListener(){
+		return this.listener;
+	}
+
+}

group02/1554421063/src/com/github/FelixCJF/coding2017/coderising/download/FileDownloaderTest.java

@@ -0,0 +1,60 @@
+package com.github.FelixCJF.coding2017.coderising.download;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import com.github.FelixCJF.coding2017.coderising.download.api.ConnectionManager;
+import com.github.FelixCJF.coding2017.coderising.download.api.DownloadListener;
+import com.github.FelixCJF.coding2017.coderising.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() {
+
+		String url = "https://www.baidu.com/img/bd_logo.png";
+
+		FileDownloader downloader = new FileDownloader(url);
+
+
+		ConnectionManager cm = new ConnectionManagerImpl();
+		downloader.setConnectionManager(cm);
+
+		downloader.setListener(new DownloadListener() {
+			@Override
+			public void notifyFinished() {
+				downloadFinished = true;
+			}
+
+		});
+
+
+		downloader.execute();
+
+		// 等待多线程下载程序执行完毕
+		while (!downloadFinished) {
+			try {
+				System.out.println("还没有下载完成，休眠五秒");
+				//休眠5秒
+				Thread.sleep(5000);
+			} catch (InterruptedException e) {				
+				e.printStackTrace();
+			}
+		}
+		System.out.println("下载完成！");
+
+
+
+	}
+
+}

group02/1554421063/src/com/github/FelixCJF/coding2017/coderising/download/api/Connection.java

@@ -0,0 +1,23 @@
+package com.github.FelixCJF.coding2017.coderising.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
+	 */
+	public int getContentLength();
+
+	/**
+	 * 关闭连接
+	 */
+	public void close();
+}

group02/1554421063/src/com/github/FelixCJF/coding2017/coderising/download/api/ConnectionException.java

@@ -0,0 +1,5 @@
+package com.github.FelixCJF.coding2017.coderising.download.api;
+
+public class ConnectionException extends Exception {
+
+}

group02/1554421063/src/com/github/FelixCJF/coding2017/coderising/download/api/ConnectionManager.java

@@ -0,0 +1,10 @@
+package com.github.FelixCJF.coding2017.coderising.download.api;
+
+public interface ConnectionManager {
+	/**
+	 * 给定一个url , 打开一个连接
+	 * @param url
+	 * @return
+	 */
+	public Connection open(String url) throws ConnectionException;	
+}

group02/1554421063/src/com/github/FelixCJF/coding2017/coderising/download/api/DownloadListener.java

@@ -0,0 +1,5 @@
+package com.github.FelixCJF.coding2017.coderising.download.api;
+
+public interface DownloadListener {
+	public void notifyFinished();
+}

group02/1554421063/src/com/github/FelixCJF/coding2017/coderising/download/impl/ConnectionImpl.java

@@ -0,0 +1,54 @@
+package com.github.FelixCJF.coding2017.coderising.download.impl;
+
+import java.io.BufferedInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.net.URLConnection;
+
+import com.github.FelixCJF.coding2017.coderising.download.api.Connection;
+
+
+public class ConnectionImpl implements Connection{
+
+
+	public URLConnection urlConnection;
+
+	public ConnectionImpl(URLConnection urlConnection) {
+		this.urlConnection = urlConnection;
+	}
+
+	@Override
+	public byte[] read(int startPos, int endPos) throws IOException {
+		//设置连接超时属性
+		urlConnection.setReadTimeout(5000);
+
+		urlConnection.setRequestProperty("Range", "bytes=" + startPos + "-" + endPos);
+
+		BufferedInputStream inputStream= new BufferedInputStream(urlConnection.getInputStream());
+		ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+
+		byte[] buff = new byte[1024];
+		int len = 0;
+
+		while ((len = inputStream.read(buff)) != -1) {
+			outputStream.write(buff,0,len);
+		}
+		byte[] temp = outputStream.toByteArray();
+
+		inputStream.close();
+		outputStream.close();
+
+		return temp;
+	}
+
+	@Override
+	public int getContentLength() {
+		return urlConnection.getContentLength();
+	}
+
+	@Override
+	public void close() {
+		urlConnection = null;
+	}
+
+}

group02/1554421063/src/com/github/FelixCJF/coding2017/coderising/download/impl/ConnectionManagerImpl.java

@@ -0,0 +1,25 @@
+package com.github.FelixCJF.coding2017.coderising.download.impl;
+
+
+import java.net.URL;
+
+import com.github.FelixCJF.coding2017.coderising.download.api.Connection;
+import com.github.FelixCJF.coding2017.coderising.download.api.ConnectionException;
+import com.github.FelixCJF.coding2017.coderising.download.api.ConnectionManager;
+
+public class ConnectionManagerImpl implements ConnectionManager {
+
+	@Override
+	public Connection open(String url) throws ConnectionException {
+		Connection connection = null;
+		try {
+
+			connection = new ConnectionImpl(new URL(url).openConnection());
+
+		} catch (Exception e) {
+			e.printStackTrace();
+		}
+		return connection;
+	}
+
+}

group02/1554421063/src/com/github/FelixCJF/coding2017/coderising/litestruts/LoginAction.java

@@ -1,39 +1,43 @@
-package com.coderising.litestruts;
-
-/**
- * 这是一个用来展示登录的业务类， 其中的用户名和密码都是硬编码的。
- * @author liuxin
- *
- */
-public class LoginAction{
-    private String name ;
-    private String password;
-    private String message;
-
-    public String getName() {
-        return name;
-    }
-
-    public String getPassword() {
-        return password;
-    }
-
-    public String execute(){
-            if("test".equals(name) && "1234".equals(password)){
-                this.message = "login successful";
-                return "success";
-            }
-            this.message = "login failed,please check your user/pwd";
-            return "fail";
-    }
-
-    public void setName(String name){
-        this.name = name;
-    }
-    public void setPassword(String password){
-        this.password = password;
-    }
-    public String getMessage(){
-        return this.message;
-    }
-}
+package com.github.FelixCJF.coding2017.coderising.litestruts;
+
+/**
+ * 这是一个用来展示登录的业务类， 其中的用户名和密码都是硬编码的。
+ * @author liuxin
+ *
+ */
+public class LoginAction{
+    private String name ;
+    private String password;
+    private String message;
+
+    public String getName() {
+        return name;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public String execute(){
+            if("test".equals(name) && "1234".equals(password)){
+                this.message = "login successful";
+                return "success";
+            }
+            this.message = "login failed,please check your user/pwd";
+            return "fail";
+    }
+
+    public void setName(String name){
+        this.name = name;
+    }
+    public void setPassword(String password){
+        this.password = password;
+    }
+    public String getMessage(){
+        return this.message;
+    }
+
+	public void setMessage(String message) {
+		this.message = message;
+	}
+}