wizardzhang2017 · wizardzhang2017 · Mar 27, 2017 · Mar 26, 2017
diff --git a/group27/513274874/homework/src/com/coding/basic/LinkedList.java b/group27/513274874/homework/src/com/coding/basic/LinkedList.java
@@ -185,4 +185,81 @@ public void setNext(Node 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(){
+
+	}
+
+	/**
+	 * 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(){
+
+	}
+
+	/**
+	 * 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){
+
+	}
+	/**
+	 * 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){
+		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){
+
+	}
+
+	/**
+	 * 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(){
+
+	}
+
+	/**
+	 * 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){
+
+	}
+
+	/**
+	 * 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  LinkedList intersection( LinkedList list){
+		return null;
+	}
+
+
 }
diff --git a/group27/513274874/homework/src/com/coding/coderising/download/DownloadThread.java b/group27/513274874/homework/src/com/coding/coderising/download/DownloadThread.java
@@ -1,20 +1,30 @@
-package com.coderising.download;
+package com.coding.coderising.download;
 
-import com.coderising.download.api.Connection;
+import com.coding.coderising.download.api.Connection;
+
+import java.io.IOException;
+import java.io.RandomAccessFile;
 
 public class DownloadThread extends Thread{
 
 	Connection conn;
 	int startPos;
 	int endPos;
 
+	// 将下载到的字节输出到raf中
+	private RandomAccessFile raf;
+
 	public DownloadThread( Connection conn, int startPos, int endPos){
 
 		this.conn = conn;		
 		this.startPos = startPos;
 		this.endPos = endPos;
 	}
-	public void run(){	
-
+	public void run(){
+		try {
+			conn.read(startPos,endPos);
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
 	}
 }
diff --git a/group27/513274874/homework/src/com/coding/coderising/download/FileDownloader.java b/group27/513274874/homework/src/com/coding/coderising/download/FileDownloader.java
@@ -1,9 +1,9 @@
-package com.coderising.download;
+package com.coding.coderising.download;
 
-import com.coderising.download.api.Connection;
-import com.coderising.download.api.ConnectionException;
-import com.coderising.download.api.ConnectionManager;
-import com.coderising.download.api.DownloadListener;
+import com.coding.coderising.download.api.Connection;
+import com.coding.coderising.download.api.ConnectionException;
+import com.coding.coderising.download.api.ConnectionManager;
+import com.coding.coderising.download.api.DownloadListener;
 
 
 public class FileDownloader {

diff --git a/group27/513274874/homework/src/com/coding/coderising/download/FileDownloaderTest.java b/group27/513274874/homework/src/com/coding/coderising/download/FileDownloaderTest.java
@@ -1,12 +1,12 @@
-package com.coderising.download;
+package com.coding.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.coding.coderising.download.api.ConnectionManager;
+import com.coding.coderising.download.api.DownloadListener;
+import com.coding.coderising.download.impl.ConnectionManagerImpl;
 
 public class FileDownloaderTest {
 	boolean downloadFinished = false;

diff --git a/group27/513274874/homework/src/com/coding/coderising/download/api/Connection.java b/group27/513274874/homework/src/com/coding/coderising/download/api/Connection.java
@@ -1,4 +1,4 @@
-package com.coderising.download.api;
+package com.coding.coderising.download.api;
 
 import java.io.IOException;
 

diff --git a/group27/513274874/homework/src/com/coding/coderising/download/api/ConnectionException.java b/group27/513274874/homework/src/com/coding/coderising/download/api/ConnectionException.java
@@ -1,4 +1,4 @@
-package com.coderising.download.api;
+package com.coding.coderising.download.api;
 
 public class ConnectionException extends Exception {
 

diff --git a/group27/513274874/homework/src/com/coding/coderising/download/api/ConnectionManager.java b/group27/513274874/homework/src/com/coding/coderising/download/api/ConnectionManager.java
@@ -1,4 +1,4 @@
-package com.coderising.download.api;
+package com.coding.coderising.download.api;
 
 public interface ConnectionManager {
 	/**

diff --git a/group27/513274874/homework/src/com/coding/coderising/download/api/DownloadListener.java b/group27/513274874/homework/src/com/coding/coderising/download/api/DownloadListener.java
@@ -1,4 +1,4 @@
-package com.coderising.download.api;
+package com.coding.coderising.download.api;
 
 public interface DownloadListener {
 	public void notifyFinished();

diff --git a/group27/513274874/homework/src/com/coding/coderising/download/demo/DownThread.java b/group27/513274874/homework/src/com/coding/coderising/download/demo/DownThread.java
@@ -0,0 +1,72 @@
+package com.coding.coderising.download.demo;
+
+import java.io.InputStream;
+import java.io.RandomAccessFile;  
+
+public class DownThread extends Thread {  
+
+    // 定义字节数组（取水的竹筒）的长度  
+    private final int BUFF_LEN = 32;  
+
+    // 定义下载的起始点  
+    private long start;  
+
+    // 定义下载的结束点  
+    private long end;  
+
+    // 下载资源对应的输入流  
+    private InputStream is;  
+
+    // 将下载到的字节输出到raf中  
+    private RandomAccessFile raf;  
+
+
+    // 构造器，传入输入流，输出流和下载起始点、结束点  
+    public DownThread(long start, long end, InputStream is, RandomAccessFile raf) {  
+        // 输出该线程负责下载的字节位置  
+        System.out.println(start + "---->" + end);  
+        this.start = start;  
+        this.end = end;  
+        this.is = is;  
+        this.raf = raf;  
+    }  
+
+    @Override
+    public void run() {  
+        try {  
+            is.skip(start);  
+            raf.seek(start);  
+            // 定义读取输入流内容的的缓存数组（竹筒）  
+            byte[] buff = new byte[BUFF_LEN];  
+            // 本线程负责下载资源的大小  
+            long contentLen = end - start;  
+            // 定义最多需要读取几次就可以完成本线程的下载  
+            long times = contentLen / BUFF_LEN + 4;  
+            // 实际读取的字节数  
+            int hasRead = 0;  
+            for (int i = 0; i < times; i++) {  
+                hasRead = is.read(buff);  
+                // 如果读取的字节数小于0，则退出循环！  
+                if (hasRead < 0) {  
+                    break;  
+                }  
+                raf.write(buff, 0, hasRead);  
+            }  
+        } catch (Exception ex) {  
+            ex.printStackTrace();  
+        }  
+        // 使用finally块来关闭当前线程的输入流、输出流  
+        finally {  
+            try {  
+                if (is != null) {  
+                    is.close();  
+                }  
+                if (raf != null) {  
+                    raf.close();  
+                }  
+            } catch (Exception ex) {  
+                ex.printStackTrace();  
+            }  
+        }  
+    }  
+}  
diff --git a/group27/513274874/homework/src/com/coding/coderising/download/demo/MutilDown.java b/group27/513274874/homework/src/com/coding/coderising/download/demo/MutilDown.java
@@ -0,0 +1,72 @@
+package com.coding.coderising.download.demo;
+
+import java.io.InputStream;
+import java.io.RandomAccessFile;  
+import java.net.URL;  
+import java.net.URLConnection;  
+
+public class MutilDown {  
+
+    public static void main(String[] args) {  
+        //定义几个线程去下载  
+        final int DOWN_THREAD_NUM = 4;  
+        final String OUT_FILE_NAME = "down.jpg";  
+        InputStream[] isArr = new InputStream[DOWN_THREAD_NUM];  
+        RandomAccessFile[] outArr = new RandomAccessFile[DOWN_THREAD_NUM];  
+        try {  
+            // 创建一个URL对象  
+            URL url = new URL("http://hiphotos.baidu.com/240728057/pic/item/6a50e38242aad8f60cf4d2b3.jpg");  
+            // 以此URL对象打开第一个输入流  
+            isArr[0] = url.openStream();  
+            long fileLen = getFileLength(url);  
+            System.out.println("网络资源的大小" + fileLen);  
+            // 以输出文件名创建第一个RandomAccessFile输出流  
+            //创建从中读取和向其中写入（可选）的随机存取文件流，第一个参数：文件名，第二个参数是：参数指定用以打开文件的访问模式  
+            //"rw"可能是可读可写，  
+            outArr[0] = new RandomAccessFile(OUT_FILE_NAME, "rw");  
+            // 创建一个与下载资源相同大小的空文件  
+            for (int i = 0; i < fileLen; i++) {  
+                outArr[0].write(0);  
+            }  
+            // 每线程应该下载的字节数  
+            long numPerThred = fileLen / DOWN_THREAD_NUM;  
+            // 整个下载资源整除后剩下的余数取模  
+            long left = fileLen % DOWN_THREAD_NUM;  
+            for (int i = 0; i < DOWN_THREAD_NUM; i++) {  
+                // 为每个线程打开一个输入流、一个RandomAccessFile对象，  
+                // 让每个线程分别负责下载资源的不同部分。  
+                //isArr[0]和outArr[0]已经使用，从不为0开始  
+                if (i != 0) {  
+                    // 以URL打开多个输入流  
+                    isArr[i] = url.openStream();  
+                    // 以指定输出文件创建多个RandomAccessFile对象  
+                    outArr[i] = new RandomAccessFile(OUT_FILE_NAME, "rw");  
+                }  
+                // 分别启动多个线程来下载网络资源  
+                if (i == DOWN_THREAD_NUM - 1) {  
+                    // 最后一个线程下载指定numPerThred+left个字节  
+                    new DownThread(i * numPerThred, (i + 1) * numPerThred  
+                            + left, isArr[i], outArr[i]).start();  
+                } else {  
+                    // 每个线程负责下载一定的numPerThred个字节  
+                    new DownThread(i * numPerThred, (i + 1) * numPerThred,  
+                            isArr[i], outArr[i]).start();  
+                }  
+            }  
+        } catch (Exception ex) {  
+            ex.printStackTrace();  
+        }  
+    }  
+
+    // 定义获取指定网络资源的长度的方法  
+    public static long getFileLength(URL url) throws Exception {  
+        long length = 0;  
+        // 打开该URL对应的URLConnection  
+        URLConnection con = url.openConnection();  
+        // 获取连接URL资源的长度  
+        long size = con.getContentLength();  
+        length = size;  
+        return length;  
+    }  
+
+}