Merge pull request #154 from jodie-zss/master

jvm第一次作业

group15/1513_121469918/HomeWork20170305/src/com/coderising/litestruts/struts.xml → group15/1502_1617273078/data-structure/out/production/data-structure/com/coderising/litestruts/struts.xml

@@ -4,7 +4,7 @@
         <result name="success">/jsp/homepage.jsp</result>
         <result name="fail">/jsp/showLogin.jsp</result>
     </action>
-    <action name="logout" class="com.coderising.action.LogoutAction">
+    <action name="logout" class="com.coderising.litestruts.LogoutAction">
     	<result name= "success">/jsp/welcome.jsp</result>
     	<result name= "error">/jsp/error.jsp</result>
     </action>

group15/1502_1617273078/data-structure/src/com/coderising/download/DownloadThread.java

@@ -0,0 +1,48 @@
+package com.coderising.download;
+
+import com.coderising.download.api.Connection;
+
+import java.io.*;
+
+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;
+		System.out.println(startPos + "---->" + endPos);
+	}
+	public void run(){
+		try {
+			File file = new File("test.jpg");
+			RandomAccessFile out = null;
+			if (file != null) {
+				out = new RandomAccessFile(file,"rwd");
+			}
+
+			byte[] buffer = new byte[1024];
+		/*	out.seek(startPos);
+			out.write(conn.read(startPos,endPos));*/
+			InputStream in = conn.getHttpURLConnection().getInputStream();
+			in.skip(startPos);
+			int len = 0;
+			while ((len = in.read(buffer)) != 1) {
+				if (len < 0) {
+					break;
+				}else {
+					//System.out.println("len length"+len);
+					out.write(buffer, 0, len);
+				}
+			}
+
+			out.close();
+
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+}

group15/1502_1617273078/data-structure/src/com/coderising/download/FileDownloader.java

@@ -0,0 +1,97 @@
+package com.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 java.io.IOException;
+import java.io.RandomAccessFile;
+
+
+public class FileDownloader {
+
+	String url;
+
+	DownloadListener listener;
+
+	ConnectionManager cm;
+
+
+	public FileDownloader(String _url) {
+		this.url = _url;
+
+	}
+    public static synchronized void writefile(int index, RandomAccessFile randomAccessFile, byte[] bytes) throws IOException {
+        randomAccessFile.seek(index);
+        randomAccessFile.write(bytes);
+    }
+
+    public void execute(int threadnum) 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 filelength = conn.getContentLength();
+			//randomAccessFile.setLength(filelength);
+			int[] index = new int[threadnum+1];
+			for (int i = 0; i <index.length-1 ; i++) {
+				index[i] = 0 + i * (filelength / threadnum);
+			}
+            index[index.length - 1]=filelength;
+            DownloadThread thread;
+            for (int i = 0; i <threadnum ; i++) {
+
+                 thread=new DownloadThread(conn, index[i], index[i+1]);
+                 thread.start();
+                 thread.join();
+			}
+
+            listener.notifyFinished();
+		} catch (ConnectionException e) {			
+			e.printStackTrace();
+		} catch (InterruptedException 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;
+	}
+
+}

group15/1502_1617273078/data-structure/src/com/coderising/download/FileDownloaderTest.java

@@ -0,0 +1,62 @@
+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 java.io.IOException;
+
+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://localhost:8080/test.jpg";
+		String url="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1489083998807&di=5bd3803161f80b5f9ef6f3277398c4ac&imgtype=0&src=http%3A%2F%2Ff.hiphotos.baidu.com%2Fimage%2Fpic%2Fitem%2Fbba1cd11728b47101489df48c0cec3fdfd03238b.jpg";
+
+		FileDownloader downloader = new FileDownloader(url);
+
+
+		ConnectionManager cm = new ConnectionManagerImpl();
+		downloader.setConnectionManager(cm);
+
+		downloader.setListener(new DownloadListener() {
+			@Override
+			public void notifyFinished() {
+				downloadFinished = true;
+			}
+
+		});
+
+
+		downloader.execute(5);
+
+		// 等待多线程下载程序执行完毕
+		while (!downloadFinished) {
+			try {
+				System.out.println("download is not finished，thread sleep five seconds");
+				//休眠5秒
+				Thread.sleep(5000);
+			} catch (InterruptedException e) {				
+				e.printStackTrace();
+			}
+		}
+		System.out.println("the download finished !");
+
+
+
+	}
+
+}

group15/1502_1617273078/data-structure/src/com/coderising/download/api/Connection.java

@@ -0,0 +1,27 @@
+package com.coderising.download.api;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+
+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();
+	public HttpURLConnection
+
+	getHttpURLConnection();
+}

group15/1502_1617273078/data-structure/src/com/coderising/download/api/ConnectionException.java

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

group15/1502_1617273078/data-structure/src/com/coderising/download/api/ConnectionManager.java

@@ -0,0 +1,13 @@
+package com.coderising.download.api;
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+
+public interface ConnectionManager {
+	/**
+	 * 给定一个url , 打开一个连接
+	 * @param url
+	 * @return
+	 */
+	public Connection open(String url) throws ConnectionException, IOException;
+}

group15/1502_1617273078/data-structure/src/com/coderising/download/api/DownloadListener.java

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

group15/1502_1617273078/data-structure/src/com/coderising/download/impl/ConnectionImpl.java

@@ -0,0 +1,58 @@
+package com.coderising.download.impl;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.util.Arrays;
+
+import com.coderising.download.api.Connection;
+
+public class ConnectionImpl implements Connection {
+	HttpURLConnection httpURLConnection;
+	static final int BUFFER_SIZE = 1024;
+	@Override
+	public byte[] read(int startPos, int endPos) throws IOException {
+		//byte[] data = new byte[endPos - startPos];
+		//httpURLConnection.setRequestProperty("Range", "bytes=" + startPos + "-" + endPos);
+		InputStream fis=httpURLConnection.getInputStream();
+		fis.skip(startPos);
+		byte[] buff = new byte[BUFFER_SIZE];
+		int totalLen = endPos - startPos + 1;
+		ByteArrayOutputStream baos = new ByteArrayOutputStream();
+		while (baos.size() < totalLen) {
+			int len = fis.read(buff);
+			if (len < 0) {
+				break;
+			}
+			baos.write(buff,0,len);
+		}
+		if (baos.size() > totalLen) {
+			byte[] datas = baos.toByteArray();
+			return Arrays.copyOf(datas, totalLen);
+		}
+
+
+		return baos.toByteArray();
+	}
+
+	@Override
+	public int getContentLength() {
+		int length = httpURLConnection.getContentLength();
+		return length;
+	}
+
+	@Override
+	public void close() {
+		httpURLConnection.disconnect();
+
+	}
+
+	public void setHttpURLConnection(HttpURLConnection httpURLConnection) {
+		this.httpURLConnection = httpURLConnection;
+	}
+
+	public HttpURLConnection getHttpURLConnection() {
+		return httpURLConnection;
+	}
+}

group15/1502_1617273078/data-structure/src/com/coderising/download/impl/ConnectionManagerImpl.java

@@ -0,0 +1,30 @@
+package com.coderising.download.impl;
+
+import com.coderising.download.api.Connection;
+import com.coderising.download.api.ConnectionException;
+import com.coderising.download.api.ConnectionManager;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+public class ConnectionManagerImpl implements ConnectionManager {
+
+	@Override
+	public Connection open(String url) throws ConnectionException, IOException {
+		URL url1 = new URL(url);
+        HttpURLConnection conn = (HttpURLConnection) url1.openConnection();
+        conn.setRequestMethod("GET");
+        //conn.setRequestProperty();
+		conn.setConnectTimeout(10*1000);
+		//防止屏蔽程序抓取而返回403错误
+		conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
+        ConnectionImpl connection = new ConnectionImpl();
+		connection.setHttpURLConnection(conn);
+		//conn.connect();
+        //conn.getContentLength();
+        return connection;
+	}
+
+}

group15/1502_1617273078/data-structure/src/com/coderising/litestruts/struts.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<struts>
+    <action name="login" class="com.coderising.litestruts.LoginAction">
+        <result name="success">/jsp/homepage.jsp</result>
+        <result name="fail">/jsp/showLogin.jsp</result>
+    </action>
+    <action name="logout" class="com.coderising.litestruts.LogoutAction">
+    	<result name= "success">/jsp/welcome.jsp</result>
+    	<result name= "error">/jsp/error.jsp</result>
+    </action>
+</struts>