From fbf13438ced757f0b164b54aca8e2b42b37aa507 Mon Sep 17 00:00:00 2001
From: Kelly <205301442@qq.com>
Date: Sun, 19 Mar 2017 22:31:24 +0800
Subject: [PATCH] week3

---
 group10/205301442/src/api/Connection.java     |  23 ++
 .../src/api/ConnectionException.java          |   5 +
 .../205301442/src/api/ConnectionManager.java  |  10 +
 .../205301442/src/api/DownloadListener.java   |   6 +
 .../src/com/coding/week1/LinkedList1.java     | 280 ++++++++++++++++++
 .../src/download/DownloadThread.java          |  28 ++
 .../src/download/FileDownloader.java          | 157 ++++++++++
 .../src/download/FileDownloaderTest.java      |  50 ++++
 .../src/download/api/Connection.java          |  23 ++
 .../src/download/api/ConnectionException.java |   5 +
 .../src/download/api/ConnectionManager.java   |  10 +
 .../src/download/api/DownloadListener.java    |   6 +
 .../src/download/impl/ConnectionImpl.java     |  76 +++++
 .../download/impl/ConnectionManagerImpl.java  |  34 +++
 .../src/download/impl/DoloadListenerImpl.java |  16 +
 .../205301442/src/impl/ConnectionImpl.java    |  76 +++++
 .../src/impl/ConnectionManagerImpl.java       |  34 +++
 .../src/impl/DoloadListenerImpl.java          |  16 +
 18 files changed, 855 insertions(+)
 create mode 100644 group10/205301442/src/api/Connection.java
 create mode 100644 group10/205301442/src/api/ConnectionException.java
 create mode 100644 group10/205301442/src/api/ConnectionManager.java
 create mode 100644 group10/205301442/src/api/DownloadListener.java
 create mode 100644 group10/205301442/src/com/coding/week1/LinkedList1.java
 create mode 100644 group10/205301442/src/download/DownloadThread.java
 create mode 100644 group10/205301442/src/download/FileDownloader.java
 create mode 100644 group10/205301442/src/download/FileDownloaderTest.java
 create mode 100644 group10/205301442/src/download/api/Connection.java
 create mode 100644 group10/205301442/src/download/api/ConnectionException.java
 create mode 100644 group10/205301442/src/download/api/ConnectionManager.java
 create mode 100644 group10/205301442/src/download/api/DownloadListener.java
 create mode 100644 group10/205301442/src/download/impl/ConnectionImpl.java
 create mode 100644 group10/205301442/src/download/impl/ConnectionManagerImpl.java
 create mode 100644 group10/205301442/src/download/impl/DoloadListenerImpl.java
 create mode 100644 group10/205301442/src/impl/ConnectionImpl.java
 create mode 100644 group10/205301442/src/impl/ConnectionManagerImpl.java
 create mode 100644 group10/205301442/src/impl/DoloadListenerImpl.java

diff --git a/group10/205301442/src/api/Connection.java b/group10/205301442/src/api/Connection.java
new file mode 100644
index 0000000000..0957eaf7f4
--- /dev/null
+++ b/group10/205301442/src/api/Connection.java
@@ -0,0 +1,23 @@
+package com.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();
+}
diff --git a/group10/205301442/src/api/ConnectionException.java b/group10/205301442/src/api/ConnectionException.java
new file mode 100644
index 0000000000..1551a80b3d
--- /dev/null
+++ b/group10/205301442/src/api/ConnectionException.java
@@ -0,0 +1,5 @@
+package com.coderising.download.api;
+
+public class ConnectionException extends Exception {
+
+}
diff --git a/group10/205301442/src/api/ConnectionManager.java b/group10/205301442/src/api/ConnectionManager.java
new file mode 100644
index 0000000000..ce045393b1
--- /dev/null
+++ b/group10/205301442/src/api/ConnectionManager.java
@@ -0,0 +1,10 @@
+package com.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;	
+}
diff --git a/group10/205301442/src/api/DownloadListener.java b/group10/205301442/src/api/DownloadListener.java
new file mode 100644
index 0000000000..41c4907246
--- /dev/null
+++ b/group10/205301442/src/api/DownloadListener.java
@@ -0,0 +1,6 @@
+package com.coderising.download.api;
+
+public interface DownloadListener {
+	public void notifyFinished(boolean isFinish);
+	public boolean getIsFinished();
+}
diff --git a/group10/205301442/src/com/coding/week1/LinkedList1.java b/group10/205301442/src/com/coding/week1/LinkedList1.java
new file mode 100644
index 0000000000..9583a6505c
--- /dev/null
+++ b/group10/205301442/src/com/coding/week1/LinkedList1.java
@@ -0,0 +1,280 @@
+package com.coding.week1;
+import java.util.List;
+import java.util.ArrayList;
+
+public class LinkedList1 {
+    private Node head;
+	private int size;
+	public void add(Object o){
+		Node node = new Node(o,null);
+		node(size-1).next = node;
+		size++;
+	}
+	public void add(int index , Object o){
+		if(index<0){
+			return;
+		}
+		Node node = new Node(o,null);
+		if(index==0){
+			head=node;
+			node.next = node(0);
+		}else{
+			node(index-1).next = node;
+			node.next = node(index+1);
+		}
+		size++;
+	}
+	public Object get(int index){
+		if(index<0){
+			return null;
+		}
+		return node(index);
+	}
+	public Object remove(int index){
+		if(index<0){
+			return null;
+		}
+		Object o =node(index).data;
+		node(index-1).next = node(index+1);
+		size--;
+		return o;
+	}
+	
+	public int size(){
+		return -1;
+	}
+	
+	public void addFirst(Object o){
+		Node n = new Node(o,null);
+		head = n;
+		if(size>0){
+			n.next = node(0);
+		}
+		size++;
+		
+	}
+	public void addLast(Object o){
+		Node n = new Node(o,null);
+		if(size>0){
+			node(size-1).next = n;
+		}else{
+			head = n;
+		}
+		size++;
+		
+	}
+	public Object removeFirst(){
+		return null;
+	}
+	public Object removeLast(){
+		return null;
+	}
+	public Iterator iterator(){
+		return new Ito();
+	}
+	public class Ito implements Iterator{
+		int cursor;
+		@Override
+		public boolean hasNext() {
+			if(cursor!=size){
+				return true;
+			}
+			return false;
+		}
+
+		@Override
+		public Object next() {
+			if(cursor>=size-1){
+				return null;
+			}
+			Object o=node(cursor).data;
+			cursor++;
+			return o;
+			
+		}
+		
+	}
+	
+	
+	private static  class Node{
+		Object data;
+		Node next;
+		public Node(Object data,Node next){
+			this.data = data;
+			this.next = next;
+		}
+		
+		
+	}
+	
+	/**
+	 * 把该链表逆置
+	 * 例如链表为 3->7->10 , 逆置后变为  10->7->3
+	 */
+	public  void reverse(){		
+		Node x = node(size-1);
+		head = x;
+		for(int i=size-2;i>=0;i--){
+			x.next = node(i);
+			x = node(i);
+		}
+	}
+	
+	/**
+	 * 删除一个单链表的前半部分
+	 * 例如：list = 2->5->7->8 , 删除以后的值为 7->8
+	 * 如果list = 2->5->7->8->10 ,删除以后的值为7,8,10
+
+	 */
+	public  void removeFirstHalf(){
+		int newSize = size/2+size%2;
+		head = node(newSize-1);
+		size =  newSize;
+	}
+	
+	/**
+	 * 从第i个元素开始， 删除length 个元素 ， 注意i从0开始
+	 * @param i
+	 * @param length
+	 */
+	public  void remove(int i, int length){
+		
+		if(i==0){
+			head = node(length);
+		}
+		node(i-1).next = node(i+length);
+	}
+	/**
+	 * 假定当前链表和listB均包含已升序排列的整数
+	 * 从当前链表中取出那些listB所指定的元素
+	 * 例如当前链表 = 11->101->201->301->401->501->601->701
+	 * listB = 1->3->4->6
+	 * 返回的结果应该是[101,301,401,601]  
+	 * @param list
+	 */
+	public  int[] getElements(LinkedList list){
+		int[] temp = new int[size];
+		for(int i=0;i<size;i++){
+			 String o= (String)node(i).data;
+			 int j=0;
+			 while(j<list.size()){
+				 if(o.indexOf((String)list.get(j))>-1){
+					 temp[0]=Integer.parseInt(o);
+					 j++;
+				 } 
+			 }
+			 
+		}
+		return null;
+	}
+	
+	/**
+	 * 已知链表中的元素以值递增有序排列，并以单链表作存储结构。
+	 * 从当前链表中中删除在listB中出现的元素 
+
+	 * @param list
+	 */
+	
+	public  void subtract(LinkedList list){
+		int[] temp = new int[size];
+		int newSize = 0;
+		for(int i=0;i<size;i++){
+			 String o= (String)node(i).data;
+			 for(int j=0;j<list.size();j++){
+				 if(list.get(j).equals(o)){
+					 if(i+1<size){
+						 node(i-1).next = node(i+1);
+						 newSize--;
+					 }else{
+						 node(i-1).next = null;
+						 
+					 }
+					 
+				 }
+			 }
+		}
+		size = newSize;
+	}
+	
+	/**
+	 * 已知当前链表中的元素以值递增有序排列，并以单链表作存储结构。
+	 * 删除表中所有值相同的多余元素（使得操作后的线性表中所有元素的值均不相同）
+	 */
+	public  void removeDuplicateValues(){
+		Node now = head;
+		while(now.next!=null){
+			if(now.data.equals(now.next.data)){
+				if(now.next.next!=null){
+					now.next = now.next.next;
+				}
+			}
+			if(now.next!=null){
+				now = now.next;
+			}
+			
+		}
+	}
+	
+	/**
+	 * 已知链表中的元素以值递增有序排列，并以单链表作存储结构。
+	 * 试写一高效的算法，删除表中所有值大于min且小于max的元素（若表中存在这样的元素）
+	 * @param min
+	 * @param max
+	 */
+	public  void removeRange(int min, int max){
+		Node n = head;
+		List<Node> lists = new ArrayList<Node>();
+		while(true){
+			if((int)n.data>min&&(int)n.data<max){
+				return;
+			}
+			lists.add(n);
+			if(n.next==null){
+				break;
+			}
+			n = n.next;
+		}
+		head = lists.get(0);
+		Node node = head;
+		for(int i=1;i<lists.size();i++){
+			node.next = lists.get(i);
+			
+			node = node.next;
+		}
+	}
+	
+	/**
+	 * 假设当前链表和参数list指定的链表均以元素依值递增有序排列（同一表中的元素值各不相同）
+	 * 现要求生成新链表C，其元素为当前链表和list中元素的交集，且表C中的元素有依值递增有序排列
+	 * @param list
+	 */
+	public  LinkedList1 intersection( LinkedList1 list){
+		LinkedList1 l = new LinkedList1();
+		Node n1 = head;
+		Node n2 = (Node) list.get(0);;
+		while(n1!=null){
+			while(n2!=null){
+				if(n1.data.equals(n2.data)){
+					l.add(n1);
+				}
+				n2 = n2.next;
+			}
+			n1 = n1.next;
+		}
+		return l;
+	}
+	public Node node(int index){
+		if(index<0){
+			return null;
+		}
+		if(index==0){
+			return head;
+		}
+		Node x =head;
+		for(int i=0;i<index;i++ ){
+				x = x.next;
+		}
+		
+		return x;
+	}
+}
diff --git a/group10/205301442/src/download/DownloadThread.java b/group10/205301442/src/download/DownloadThread.java
new file mode 100644
index 0000000000..469cf091f0
--- /dev/null
+++ b/group10/205301442/src/download/DownloadThread.java
@@ -0,0 +1,28 @@
+package com.coderising.download;
+
+import java.io.IOException;
+
+import com.coderising.download.api.Connection;
+
+public class DownloadThread extends Thread{
+
+	Connection conn;
+	int startPos;
+	int endPos;
+	byte[] reads;
+	public DownloadThread( Connection conn, int startPos, int endPos){
+		
+		this.conn = conn;		
+		this.startPos = startPos;
+		this.endPos = endPos;
+	}
+	public void run(){	
+		try {
+			 reads=conn.read(startPos, endPos);
+			
+		} catch (IOException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+	}
+}
diff --git a/group10/205301442/src/download/FileDownloader.java b/group10/205301442/src/download/FileDownloader.java
new file mode 100644
index 0000000000..e984f37187
--- /dev/null
+++ b/group10/205301442/src/download/FileDownloader.java
@@ -0,0 +1,157 @@
+package com.coderising.download;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+
+import com.coderising.download.api.Connection;
+import com.coderising.download.api.ConnectionException;
+import com.coderising.download.api.ConnectionManager;
+import com.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 conn1 = null;
+		Connection conn2 = null;
+		Connection conn3 = null;
+		//老师这里使用了栅栏 cyclicBarrier 替代了我下面这些代码的作用，我写的这堆代码最终也起到的是这样的作用，等待 N个执行完了以后去执行某件事
+		try {
+			File f = new File("F:\\百度.jpg");
+			FileOutputStream os=null;
+			try {
+				if(!f.exists()){
+					f.createNewFile();
+					
+				}else{
+					f.delete();
+				}
+				 os = new FileOutputStream(f,true);
+				 
+				 
+			} catch (FileNotFoundException e) {
+				// TODO Auto-generated catch block
+				e.printStackTrace();
+			} catch (IOException e) {
+				// TODO Auto-generated catch block
+				e.printStackTrace();
+			}
+			conn1 = cm.open(this.url);
+			conn2 = cm.open(this.url);
+			conn3 = cm.open(this.url);
+			int length = conn1.getContentLength();	
+		    
+		    
+			DownloadThread thread1=new DownloadThread(conn1,0,length/3);
+			DownloadThread thread2=new DownloadThread(conn2,length/3,(length/3)*2);
+			DownloadThread thread3 =new DownloadThread(conn3,(length/3)*2,length-1);
+		
+			thread1.start();
+			thread2.start();
+			thread3.start();
+			
+			StringBuilder add = new StringBuilder();
+			while(true){
+				if(!thread1.isAlive()&&add.indexOf("1")<0){
+					try {
+						os.write(thread1.reads);
+						add.append("1");
+					
+					} catch (IOException e) {
+						// TODO Auto-generated catch block
+						e.printStackTrace();
+					}
+				}
+			
+		
+				if(!thread2.isAlive()&&add.indexOf("2")<0&&add.indexOf("1")==0){
+					try {
+						os.write(thread2.reads);
+						add.append("2");
+						
+					} catch (IOException e) {
+						// TODO Auto-generated catch block
+						e.printStackTrace();
+					}
+				}
+			
+		
+				if(!thread3.isAlive()&&add.indexOf("3")<0&&add.indexOf("12")==0){
+					try {
+						os.write(thread3.reads);
+						add.append("3");
+						os.flush();
+						os.close();
+						//这里没明白老师设计的notifyFinished的用法
+						listener.notifyFinished(true);
+						break;
+					} catch (IOException e) {
+						// TODO Auto-generated catch block
+						e.printStackTrace();
+					}
+				}
+			
+			
+			}
+				
+		} catch (ConnectionException e) {			
+			e.printStackTrace();
+		}finally{
+			if(conn1 != null){
+				conn1.close();
+			}
+			if(conn2!=null){
+				conn2.close();
+			}
+			if(conn3!=null){
+				conn3.close();
+			}
+		}
+		
+		
+		
+		
+	}
+	
+	public void setListener(DownloadListener listener) {
+		this.listener = listener;
+	}
+
+	
+	
+	public void setConnectionManager(ConnectionManager ucm){
+		this.cm = ucm;
+	}
+	
+	public DownloadListener getListener(){
+		return this.listener;
+	}
+	
+}
diff --git a/group10/205301442/src/download/FileDownloaderTest.java b/group10/205301442/src/download/FileDownloaderTest.java
new file mode 100644
index 0000000000..ef5086a77b
--- /dev/null
+++ b/group10/205301442/src/download/FileDownloaderTest.java
@@ -0,0 +1,50 @@
+package com.coderising.download;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import com.coderising.download.api.ConnectionManager;
+import com.coderising.download.api.DownloadListener;
+import com.coderising.download.impl.ConnectionManagerImpl;
+import com.coderising.download.impl.DoloadListenerImpl;
+
+public class FileDownloaderTest {
+	@Before
+	public void setUp() throws Exception {
+	}
+
+	@After
+	public void tearDown() throws Exception {
+	}
+
+	@Test
+	public void testDownload() {
+		
+		String url = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1489320877777&di=0602ac45c01a727564917f688e3d4ad2&imgtype=0&src=http%3A%2F%2Fpic41.nipic.com%2F20140521%2F18810499_233249416000_2.jpg";
+		
+		FileDownloader downloader = new FileDownloader(url);
+		ConnectionManager cm = new ConnectionManagerImpl();
+		downloader.setConnectionManager(cm);
+		DoloadListenerImpl lister = new DoloadListenerImpl();
+		downloader.setListener(lister);
+		downloader.execute();
+		
+		
+		// 等待多线程下载程序执行完毕
+		while (!downloader.getListener().getIsFinished()) {
+			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！");
+		
+		
+
+	}
+
+}
diff --git a/group10/205301442/src/download/api/Connection.java b/group10/205301442/src/download/api/Connection.java
new file mode 100644
index 0000000000..0957eaf7f4
--- /dev/null
+++ b/group10/205301442/src/download/api/Connection.java
@@ -0,0 +1,23 @@
+package com.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();
+}
diff --git a/group10/205301442/src/download/api/ConnectionException.java b/group10/205301442/src/download/api/ConnectionException.java
new file mode 100644
index 0000000000..1551a80b3d
--- /dev/null
+++ b/group10/205301442/src/download/api/ConnectionException.java
@@ -0,0 +1,5 @@
+package com.coderising.download.api;
+
+public class ConnectionException extends Exception {
+
+}
diff --git a/group10/205301442/src/download/api/ConnectionManager.java b/group10/205301442/src/download/api/ConnectionManager.java
new file mode 100644
index 0000000000..ce045393b1
--- /dev/null
+++ b/group10/205301442/src/download/api/ConnectionManager.java
@@ -0,0 +1,10 @@
+package com.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;	
+}
diff --git a/group10/205301442/src/download/api/DownloadListener.java b/group10/205301442/src/download/api/DownloadListener.java
new file mode 100644
index 0000000000..41c4907246
--- /dev/null
+++ b/group10/205301442/src/download/api/DownloadListener.java
@@ -0,0 +1,6 @@
+package com.coderising.download.api;
+
+public interface DownloadListener {
+	public void notifyFinished(boolean isFinish);
+	public boolean getIsFinished();
+}
diff --git a/group10/205301442/src/download/impl/ConnectionImpl.java b/group10/205301442/src/download/impl/ConnectionImpl.java
new file mode 100644
index 0000000000..612ef940c9
--- /dev/null
+++ b/group10/205301442/src/download/impl/ConnectionImpl.java
@@ -0,0 +1,76 @@
+package com.coderising.download.impl;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+
+import com.coderising.download.api.Connection;
+
+public class ConnectionImpl implements Connection{
+    
+    private HttpURLConnection conn; 
+	private InputStream is;
+	public ConnectionImpl(HttpURLConnection conn) {
+		try {
+			this.conn = conn;
+			is = conn.getInputStream();
+		} catch (IOException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+				
+	}
+
+	@Override
+	public byte[] read(int startPos, int endPos) throws IOException {
+		  if(is==null){
+			  return null;
+		  }
+
+		  is.skip(startPos);
+		  int len = endPos-startPos;
+		  byte[] bt = new byte[len];
+		  byte[] temp = new byte[1024];
+		  int m=0;
+		  int nowLen=0;
+		  while((m=is.read(temp))>0){
+			  if(nowLen+m>len){
+				  System.arraycopy(temp, 0, bt, nowLen, len-nowLen);
+				  break;
+			  }
+			  System.arraycopy(temp, 0, bt, nowLen, m);
+			  nowLen += m;
+			  
+		  }
+		  return bt;
+	}
+
+	@Override
+	public int getContentLength() {
+		if(is==null){
+			return 0;
+		}
+		try {
+			int length=conn.getContentLength();
+			return length;
+		} catch (Exception e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+		return 0;
+	}
+
+	@Override
+	public void close() {
+		if(is!=null){
+			try {
+				is.close();
+			} catch (IOException e) {
+				// TODO Auto-generated catch block
+				e.printStackTrace();
+			}
+		}
+		
+	}
+
+}
diff --git a/group10/205301442/src/download/impl/ConnectionManagerImpl.java b/group10/205301442/src/download/impl/ConnectionManagerImpl.java
new file mode 100644
index 0000000000..34e02aad97
--- /dev/null
+++ b/group10/205301442/src/download/impl/ConnectionManagerImpl.java
@@ -0,0 +1,34 @@
+package com.coderising.download.impl;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import com.coderising.download.api.Connection;
+import com.coderising.download.api.ConnectionException;
+import com.coderising.download.api.ConnectionManager;
+
+public class ConnectionManagerImpl implements ConnectionManager {
+
+	//在connection里实现连接，不再这儿，这里只是返回
+	@Override
+	public Connection open(String url) throws ConnectionException {
+		try {
+			
+			
+			URL uri = new URL(url);
+			HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
+			conn.setRequestMethod("GET");
+			conn.setConnectTimeout(5*1000);
+			Connection connImpl = new ConnectionImpl(conn);
+			return connImpl;
+		} catch (IOException e) {
+			// TODO Auto-generated catch block
+			
+		}
+		return null;
+	}
+
+}
diff --git a/group10/205301442/src/download/impl/DoloadListenerImpl.java b/group10/205301442/src/download/impl/DoloadListenerImpl.java
new file mode 100644
index 0000000000..d448b817c3
--- /dev/null
+++ b/group10/205301442/src/download/impl/DoloadListenerImpl.java
@@ -0,0 +1,16 @@
+package com.coderising.download.impl;
+
+import com.coderising.download.api.DownloadListener;
+
+public class DoloadListenerImpl implements DownloadListener{
+	boolean isFinish = false;
+	@Override
+	public void notifyFinished(boolean isfinish) {
+		// TODO Auto-generated method stub
+		this.isFinish = isfinish;
+	}
+	public boolean getIsFinished(){
+		return isFinish;
+	}
+
+}
diff --git a/group10/205301442/src/impl/ConnectionImpl.java b/group10/205301442/src/impl/ConnectionImpl.java
new file mode 100644
index 0000000000..612ef940c9
--- /dev/null
+++ b/group10/205301442/src/impl/ConnectionImpl.java
@@ -0,0 +1,76 @@
+package com.coderising.download.impl;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+
+import com.coderising.download.api.Connection;
+
+public class ConnectionImpl implements Connection{
+    
+    private HttpURLConnection conn; 
+	private InputStream is;
+	public ConnectionImpl(HttpURLConnection conn) {
+		try {
+			this.conn = conn;
+			is = conn.getInputStream();
+		} catch (IOException e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+				
+	}
+
+	@Override
+	public byte[] read(int startPos, int endPos) throws IOException {
+		  if(is==null){
+			  return null;
+		  }
+
+		  is.skip(startPos);
+		  int len = endPos-startPos;
+		  byte[] bt = new byte[len];
+		  byte[] temp = new byte[1024];
+		  int m=0;
+		  int nowLen=0;
+		  while((m=is.read(temp))>0){
+			  if(nowLen+m>len){
+				  System.arraycopy(temp, 0, bt, nowLen, len-nowLen);
+				  break;
+			  }
+			  System.arraycopy(temp, 0, bt, nowLen, m);
+			  nowLen += m;
+			  
+		  }
+		  return bt;
+	}
+
+	@Override
+	public int getContentLength() {
+		if(is==null){
+			return 0;
+		}
+		try {
+			int length=conn.getContentLength();
+			return length;
+		} catch (Exception e) {
+			// TODO Auto-generated catch block
+			e.printStackTrace();
+		}
+		return 0;
+	}
+
+	@Override
+	public void close() {
+		if(is!=null){
+			try {
+				is.close();
+			} catch (IOException e) {
+				// TODO Auto-generated catch block
+				e.printStackTrace();
+			}
+		}
+		
+	}
+
+}
diff --git a/group10/205301442/src/impl/ConnectionManagerImpl.java b/group10/205301442/src/impl/ConnectionManagerImpl.java
new file mode 100644
index 0000000000..34e02aad97
--- /dev/null
+++ b/group10/205301442/src/impl/ConnectionManagerImpl.java
@@ -0,0 +1,34 @@
+package com.coderising.download.impl;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import com.coderising.download.api.Connection;
+import com.coderising.download.api.ConnectionException;
+import com.coderising.download.api.ConnectionManager;
+
+public class ConnectionManagerImpl implements ConnectionManager {
+
+	//在connection里实现连接，不再这儿，这里只是返回
+	@Override
+	public Connection open(String url) throws ConnectionException {
+		try {
+			
+			
+			URL uri = new URL(url);
+			HttpURLConnection conn = (HttpURLConnection) uri.openConnection();
+			conn.setRequestMethod("GET");
+			conn.setConnectTimeout(5*1000);
+			Connection connImpl = new ConnectionImpl(conn);
+			return connImpl;
+		} catch (IOException e) {
+			// TODO Auto-generated catch block
+			
+		}
+		return null;
+	}
+
+}
diff --git a/group10/205301442/src/impl/DoloadListenerImpl.java b/group10/205301442/src/impl/DoloadListenerImpl.java
new file mode 100644
index 0000000000..d448b817c3
--- /dev/null
+++ b/group10/205301442/src/impl/DoloadListenerImpl.java
@@ -0,0 +1,16 @@
+package com.coderising.download.impl;
+
+import com.coderising.download.api.DownloadListener;
+
+public class DoloadListenerImpl implements DownloadListener{
+	boolean isFinish = false;
+	@Override
+	public void notifyFinished(boolean isfinish) {
+		// TODO Auto-generated method stub
+		this.isFinish = isfinish;
+	}
+	public boolean getIsFinished(){
+		return isFinish;
+	}
+
+}