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Java�E�序如何限�?控制下蝲和上传速度)

Barrie — Thu, 18 Oct 2012 08:34:00 GMT

好久没有在这里写点东西了�Q�要��L��书写记录的习惯�?br />
�q�里��单的讨论一下java设计�|�络�E�序中如何控制上传和下蝲速度�Q�我们常见的FTP�Q�HTTP�Q�BT�{�协议都是TCP的，但是现在��行的utorrent却基于UDP实现了自己UTP协议(UDP+拥塞控制)�Q�不��用什么协议，站在I/O的角度来��_��限速的控制思�\都是一��L��?br />
思�\很简单，如下�Q?br />
1.假设下蝲或者上传速度上限是m (KB/s),那么发送一个固定的字节数据(假设是n字节)的时间花�Ҏ��Q�n/m�Q?br /> 2.假设现在要发送n字节的数据，那么理论所需的时间应该是n/m�Q�而在实际情况下，发送n字节的数据只��p��了t�U�，那么发送该发送线�E�就应该睡眠n/m-t�U�，�q�样��基本实��C��速度的控制�?br />
代码以TCP��Z��
速度控制

1 package com.actiontec.net.bandwidth;
2
3 /**
4  *
5  * @author Le
6  *
7  */
8 public class BandwidthLimiter {
9
10     /* KB */
11     private static Long KB = 1024l;
12
13     /* The smallest count chunk length in bytes */
14     private static Long CHUNK_LENGTH = 1024l;
15
16     /* How many bytes will be sent or receive */
17     private int bytesWillBeSentOrReceive = 0;
18
19     /* When the last piece was sent or receive */
20     private long lastPieceSentOrReceiveTick = System.nanoTime();
21
22     /* Default rate is 1024KB/s */
23     private int maxRate = 1024;
24
25     /* Time cost for sending CHUNK_LENGTH bytes in nanoseconds */
26     private long timeCostPerChunk = (1000000000l * CHUNK_LENGTH)
27             / (this.maxRate * KB);
28
29     /**
30      * Initialize a BandwidthLimiter object with a certain rate.
31      *
32      * @param maxRate
33      *            the download or upload speed in KBytes
34      */
35     public BandwidthLimiter(int maxRate) {
36         this.setMaxRate(maxRate);
37     }
38
39     /**
40      * Set the max upload or download rate in KB/s. maxRate must be grater than
41      * 0. If maxRate is zero, it means there is no bandwidth limit.
42      *
43      * @param maxRate
44      *            If maxRate is zero, it means there is no bandwidth limit.
45      * @throws IllegalArgumentException
46      */
47     public synchronized void setMaxRate(int maxRate)
48             throws IllegalArgumentException {
49         if (maxRate < 0) {
50             throw new IllegalArgumentException("maxRate can not less than 0");
51         }
52         this.maxRate = maxRate < 0 ? 0 : maxRate;
53         if (maxRate == 0)
54             this.timeCostPerChunk = 0;
55         else
56             this.timeCostPerChunk = (1000000000l * CHUNK_LENGTH)
57                     / (this.maxRate * KB);
58     }
59
60     /**
61      * Next 1 byte should do bandwidth limit.
62      */
63     public synchronized void limitNextBytes() {
64         this.limitNextBytes(1);
65     }
66
67     /**
68      * Next len bytes should do bandwidth limit
69      *
70      * @param len
71      */
72     public synchronized void limitNextBytes(int len) {
73         this.bytesWillBeSentOrReceive += len;
74
75         /* We have sent CHUNK_LENGTH bytes */
76         while (this.bytesWillBeSentOrReceive > CHUNK_LENGTH) {
77             long nowTick = System.nanoTime();
78             long missedTime = this.timeCostPerChunk
79                     - (nowTick - this.lastPieceSentOrReceiveTick);
80             if (missedTime > 0) {
81                 try {
82                     Thread.sleep(missedTime / 1000000,
83                             (int) (missedTime % 1000000));
84                 } catch (InterruptedException e) {
85                     e.printStackTrace();
86                 }
87             }
88             this.bytesWillBeSentOrReceive -= CHUNK_LENGTH;
89             this.lastPieceSentOrReceiveTick = nowTick
90                     + (missedTime > 0 ? missedTime : 0);
91         }
92     }
93 }
94

下蝲控制

1 package com.actiontec.net.bandwidth;
2
3 import java.io.IOException;
4 import java.io.InputStream;
5
6 /**
7  * @author Le
8  *
9  */
10 public class DownloadLimiter extends InputStream {
11     private InputStream is = null;
12     private BandwidthLimiter bandwidthLimiter = null;
13
14     public DownloadLimiter(InputStream is, BandwidthLimiter bandwidthLimiter)
15     {
16         this.is = is;
17         this.bandwidthLimiter = bandwidthLimiter;
18     }
19     @Override
20     public int read() throws IOException {
21         if(this.bandwidthLimiter != null)
22             this.bandwidthLimiter.limitNextBytes();
23         return this.is.read();
24     }
25
26     public int read(byte b[], int off, int len) throws IOException
27     {
28         if (bandwidthLimiter != null)
29             bandwidthLimiter.limitNextBytes(len);
30         return this.is.read(b, off, len);
31     }
32 }

同样�Q�上传控�?/div>

1 package com.actiontec.net.bandwidth;
2
3 import java.io.IOException;
4 import java.io.OutputStream;
5
6 /**
7  * @author Le
8  *
9  */
10 public class UploadLimiter extends OutputStream {
11     private OutputStream os = null;
12     private BandwidthLimiter bandwidthLimiter = null;
13
14     public UploadLimiter(OutputStream os, BandwidthLimiter bandwidthLimiter)
15     {
16         this.os = os;
17         this.bandwidthLimiter = bandwidthLimiter;
18     }
19
20     @Override
21     public void write(int b) throws IOException {
22         if (bandwidthLimiter != null)
23             bandwidthLimiter.limitNextBytes();
24         this.os.write(b);
25     }
26
27     public void write(byte[] b, int off, int len) throws IOException {
28         if (bandwidthLimiter != null)
29             bandwidthLimiter.limitNextBytes(len);
30         this.os.write(b, off, len);
31     }
32
33 }

对于一个TCP socket

1 ServerSocket socket = new ServerSocket();
2 //其它初始化略

1 //从socket中以一定的速率��L��?br /> 2 //```java
3 DownloadLimiter dl = new DownloadLimiter(socket.getInputStream(), new BandwidthLimiter(6250));
4 is = new DataInputStream(dl);
5
6 //��L��?/span>
7 int len = is.readInt();
8 ByteBuffer buffer = ByteBuffer.allocate(4 + len);
9 buffer.putInt(len);
10 is.readFully(buffer.array(), 4, buffer.remaining());
11 //```
12
13 //以一定的速率写数据到socket
14 //```java
15 UploadLimiter ul = new UploadLimiter(socket.getOutputStream(), new BandwidthLimiter(6250));
16 ul.write();
17 //```

在多�U�程环境下也可以使用上述的方法。最后附图是��d��理器的�|�络利用率图6250KB/s�Q�也��是50000kb/s,附图中网�l�利用率也在5%左右�Q�所以应该这个做法还��准��）

Barrie 2012-10-18 16:34 发表评论

openlayers��结(有参考项目代�?

Barrie — Mon, 11 Oct 2010 12:42:00 GMT

摘要: 最�q�一�D�|��间里�Q�又做了一个跟openlayers相关的项目，但是到目前�ؓ止，我对openlayers�q�是不怎么了解�Q�做东西也只是参考了openlayers的例子，以及自己的一些对openlayers用法的一些猜��。openlayers是一个用js实现的GIS前端框架�Q�我的js目前�q�是打酱油的水��^�Q�要是没有jquery�Q�那��基本写不了几行js代码了。js那是相当的强大，再加上VML\SVG、HTML... 阅读全文

Barrie 2010-10-11 20:42 发表评论

Barrie — Wed, 08 Apr 2009 06:40:00 GMT

刚刚��d��appengine的时候才发现开始支持java了�?br /> 上午的时候还没有�?br />
对java的比较熟悉，但是�q�是喜欢比较��z�的python

http://code.google.com/intl/zh-CN/appengine/docs/java/overview.html

http://googleappengine.blogspot.com/2009/04/seriously-this-time-new-language-on-app.html

�q�是注册试用后google appengine�l�发的邮�?

Hello,

Thanks for signing up to try Google App Engine for Java! Your account has now
been activated, so you can begin building applications with our new Java
runtime.

Please note that this is still an early look at our support for the Java
language and you may encounter issues during development. We look forward to
hearing your feedback! To learn more, please visit:

http://code.google.com/appengine/docs/java/overview.html

To start creating applications with Google App Engine, simply follow this link
(you may need to sign in with your burgundy.loh@gmail.com Google Account) and
verify your account with a mobile phone number if you have not already done so:

http://appengine.google.com/

If you are having trouble verifying your account via SMS please fill
out the following form and your account will be reviewed and enabled
as soon as possible:

http://appengine.google.com/waitlist/sms_issues

Thanks!
The Google App Engine Team

Java is a registered trademark of Sun Microsystems, Inc.

Barrie 2009-04-08 14:40 发表评论

中国各城市的�l�纬度数�?�_��到县�U�城�?

Barrie — Thu, 12 Mar 2009 12:34:00 GMT

�l�纬度数据收集自 �l�北有斗-天文爱好者的乐园
�~�写�q�篇博文有几个目的：
首先认识了两个单�?br />

latitude [lat·i·tude || 'lætɪtuːd /-tjuːd] n. �U�度; 回旋余地, 自由; �U�度地区

longitude [lon·gi·tude || 'lɑndʒɪtuːd /'lɒndʒɪtjuːd] n. �l�度; �l�线

1.学习dom4j的简单用�?br /> 2.做一个方便��用的全国城市�l�纬度数据库
3.利用google天气api做一个全面的天气预报服务
4.学习用python�~�写webservice

内容�Q?br /> 1.学习dom4j的简单用�?br /> 攉��了的�l�纬度都是按照城市分开的单独的htm文�g�Q�我已经处理�q��ؓ�W�合html4.0标准的html文�g了，��x��有的标识都是成对的，�q�里可以下蝲�q�些文�g(点击下蝲�l�纬度html�?
(1)如何使用dom4j��d��xml文档

使用dom4j��d��xml文档代码片段

(2)如何遍历xml文档的所有结�?br /> �q�样��p��入了�q�个xml文档�Q��ƈ获得了这个xml文档对象的根�l�点�Q�由于xml文档是一个树形结构，�q�样��很�Ҏ��遍历它所有的�l�点了�?br /> �q�里�Ҏ��自己的需要，��试使用了两�U�遍历方法，一�U�是�Ҏ��树的�l�构�~�写递归�E�序�Q�一�U�就是直接��用��@环，�q�有都dom4j自带的visitor模式讉K��也很好用�Q�这里有��参考文档，可以看看(查看)

使用递归遍历

�q�里提供的xml文档层数�?�Q�直接��@环即�?br />

直接循环遍历

关于visitor模式的��用，请参看上面给出的参考文�?br />
(3)创徏新的xml文档

创徏xml文档

整个合�ƈ所有html��ؓ一个xml的代码如�?br />

完整的代�?/span>


import java.io.File;
import java.io.FileWriter;
import java.util.Iterator;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
/**
 * @author canvas
 *
 */
public class GIS {
public void createXMLFile(String filename) throws Exception{
//使用辅助�Ҏ��创徏文档对象
Document res = DocumentHelper.createDocument();
//��d��文档跟结点country
Element rootElement = res.addElement("country");
//�l�根节点��d��属性name�Q���gؓ"中国"
rootElement.addAttribute("name", "中国");
//打开目录
File file = new File("G:\\workspace\\jwd\\jwd");
//打开目录下所有的xml文档
File[] files = file.listFiles();
//依次操作每个xml文档
for(int i = 0; i < files.length; i ++){
//获取文�g名，��L��文�g扩展�?/font>
String[] name = files[i].getName().split("\\.");
//在根�l�点下添加子节点province
Element childElement = rootElement.addElement("province");
//��d��属性name�Q���gؓ文�g�?/font>
childElement.addAttribute("name", name[0].trim());
//创徏reader
SAXReader reader = new SAXReader();
//�Ҏ��实际情况讄����~�码
reader.setEncoding("GBK");
Document doc = reader.read(files[i]);
//获得xml文档的根节点
Element root = doc.getRootElement();
//遍历所有的�l�点
this.visitAll(root, childElement);
}
//格式化即���输出的xml�Q�让它看��h��整齐�?/font>
OutputFormat format = OutputFormat.createPrettyPrint();
/*���document中的内容写入文�g�?*/
XMLWriter writer = new XMLWriter(new FileWriter(new File(filename)),format);
writer.write(res);
writer.close(); 
}
public  void visitAll(Element root, Element child){
// 枚�D所有子节点
for ( Iterator i = root.elementIterator(); i.hasNext(); ) {
Element element = (Element) i.next();
//System.out.println(stringTrim(element.getText()));
/*if(this.stringTrim(element.getTextTrim()).equals("")){
               return;
           } 
           else {
                Element tmp = child.addElement("city");
                visitAll(element, tmp);
           }*/
Iterator j = element.elementIterator();
Element tmpElement = (Element)j.next();
if(!(stringTrim(tmpElement.getTextTrim()).equals("城市�?)))
{
Element tmp = child.addElement("city");
tmp.addAttribute("name", 
stringTrim(tmpElement.getTextTrim()).trim());
tmpElement = (Element)j.next();
tmp.addAttribute("longitude", 
stringTrim(tmpElement.getTextTrim()).trim());
tmpElement = (Element)j.next();
tmp.addAttribute("latitude", 
stringTrim(tmpElement.getTextTrim()).trim());
}
}
}
public String stringTrim(String str){
//��L���I�格和全角空�?/font>
String[] tmp = str.split("\\s| ");
StringBuffer sb = new StringBuffer();
for(int i = 0; i < tmp.length; i ++){
sb.append(tmp[i].trim());
}
return sb.toString();
}
/**
     * @param args
     */
public static void main(String[] args) {
try {
new GIS().createXMLFile("d:\\GI-China.xml");
} catch (Exception e) {
e.printStackTrace();
}
}
}

2.做一个方便��用的全国城市�l�纬度数据库
�l�过上面的操作，一个完整的全国城市�l�纬度数据库��做好了�Q�只不过它是xml格式的，看�v来还不错�Q?a title="下蝲�q�个数据�? href="/Files/canvas/GI-China.zip">下蝲�q�个数据�?/a>

生成的xml展示

3.利用google天气api做一个全面的天气预报服务
google提供的天气api可以有两�U�方式访问，
一�U�是
http://www.google.com/ig/api?hl=zh-cn&weather=,,,30670000,104019996
30670000为纬度，104019996为经度，�q�个是把上面的xml中的�l�纬度乘以了10^6(10的六�ơ方)�Q�这个方法有个好处，��是可以�Ҏ��l�纬度获得天气预报，自然预报地区也可变得�_��?br /> 另一�U�是
http://www.google.com/ig/api?weather=Beijing
�q�个链接比较��单，但是支持的城市比较少�Q�所以还是��用第一�U�方式比较好�Q�于是才整理好了所有城市的�l�纬�?br />
讉K��上面的链接，google�q�回的xml内容看�v来是�q�样�?br />

google�q�回的xml

对于�q�回的xml中的�Q�可以这��h��造链接获取google提供的图�?br /> 取其中的cn_cloudy.gif�Q�然后放在http://www.google.cn/ig/images/weather/之后�Q�生成的链接�?br /> http://www.google.cn/ig/images/weather/cn_cloudy.png
�q�样�q�个天气api��基本构思好�?br />
4.学习用python�~�写webservice(待箋……)
��这个服务编写�ؓ一个webservice�Q�决定��用python��d��Q�所以要学习一下python�?br />

Barrie 2009-03-12 20:34 发表评论

打造ICTCLAS JNI For Java

Barrie — Tue, 06 May 2008 06:40:00 GMT

声明:ICTCLAS以及我修改ICTCLAS JNI For Java的版权均归原作者所有，未经原作者允许，请勿作其它商业用�?/font>
首先下蝲ICTCLAS Beta版本公开源代�?点击下蝲
我��用的是Visual studio 2005开发环境，源码使用VC6开发的�Q�现在把�q�个工程转移到VS2005下。我使用的方法比较笨�Q�基本上是属于体�?暴力型的�Q�不�q�自��p��得爽��可以了
在VS2005里新建Win32��目FREEICTCLAS,在application Settings选项里选中Dll和Empty Project,然后新徏以下�q��o�?New Filter)�Q��ƈ且将原项目的源码及其目录�l�构copy到现在的win32��目的目录下(�q��o器和��目目录�C�意�?

�C�意�?点击前面+号展开)

�q�样�q�个win32工程基本��徏完了�?br /> 观察ICTCLAS源代码后�~�写以下带有native声明的方法的java�c�，只实��C��头两个方法，�W�三个暂未实玎ͼ�与ICTCLAS接口基本保持一�?br /> 代码如下:

FreeICTCLAS.java(点击+展开)

然后在命令行输入Javac FreeICTCLAS.java�~�译FreeICTCLAS.java
生成FreeICTCLAS.class文�g后，再��用javah FreeICTCLAS生成FreeICTCLAS.h�Q�代码如下：

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class FreeICTCLAS */

#ifndef _Included_FreeICTCLAS
#define _Included_FreeICTCLAS
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class:     FreeICTCLAS
* Method:    FreeICTCLAS_Init
* Signature: (II)Z
*/
JNIEXPORT jboolean JNICALL Java_FreeICTCLAS_FreeICTCLAS_1Init
  (JNIEnv *, jobject, jint, jint);

/*
* Class:     FreeICTCLAS
* Method:    FreeICTCLAS_ParagraphProcess
* Signature: (Ljava/lang/String;)Ljava/lang/String;
*/
JNIEXPORT jstring JNICALL Java_FreeICTCLAS_FreeICTCLAS_1ParagraphProcess
  (JNIEnv *, jobject, jstring);

/*
* Class:     FreeICTCLAS
* Method:    FreeICTCLAS_FileProcess
* Signature: (Ljava/lang/String;Ljava/lang/String;)Z
*/
JNIEXPORT jboolean JNICALL Java_FreeICTCLAS_FreeICTCLAS_1FileProcess
  (JNIEnv *, jobject, jstring, jstring);

#ifdef __cplusplus
}
#endif
#endif

��FreeICTCLAS.h拯��到win32��目所在目录中�Q�再��其��d��到项目中�Q�接下来��是�~�写FreeICTCLAS.cpp实现头文仉��Ҏ��
主要代码如下�Q?br />

#include "FreeICTCLAS.h"
#include "util.h"
#include "globeVar.h"
#include <string.h>
#include <stdlib.h>
/*
* Class:     FreeICTCLAS
* Method:    FreeICTCLAS_Init
* Signature: (II)Z
*/
JNIEXPORT jboolean JNICALL Java_FreeICTCLAS_FreeICTCLAS_1Init
(JNIEnv *env, jobject obj, jint OperateType, jint OutputFormat)
{
    m_ICTCLAS.m_nOperateType = OperateType;
    m_ICTCLAS.m_nOutputFormat = OutputFormat;
    return JNI_TRUE;
}
/*
* Class:     FreeICTCLAS
* Method:    FreeICTCLAS_ParagraphProcess
* Signature: (Ljava/lang/String;)Ljava/lang/String;
*/
JNIEXPORT jstring JNICALL Java_FreeICTCLAS_FreeICTCLAS_1ParagraphProcess
(JNIEnv *env, jobject obj, jstring sParagraph)
{
    char *sResult,*sSource;
    sSource = jstringTochar(env, sParagraph);
    if(m_ICTCLAS.m_nOutputFormat!=2)
        sResult=new char [(strlen(sSource)+13)*3];
    else
        sResult=new char [(strlen(sSource)+13)*50];

    if(!m_ICTCLAS.ParagraphProcessing(sSource,sResult))
        exit(1);
    else
        return chartoJstring(env,sResult);
}
/*
* Class:     FreeICTCLAS
* Method:    FreeICTCLAS_FileProcess
* Signature: (Ljava/lang/String;Ljava/lang/String;)Z
*/
JNIEXPORT jboolean JNICALL Java_FreeICTCLAS_FreeICTCLAS_1FileProcess
(JNIEnv *env, jobject obj, jstring sSourceFilename, jstring sResultFilename)
{
    return JNI_TRUE;
}

�~�译��目�Q�在release目录中找到FreeICTCLAS.dll�Q�将其拷贝到FreeICTCLAS.class所在的目录�?br /> 现在�q�行java FreeICTCLAS卛_��看到中文分词的结果啦

怎么把ICTCLAS JNI for Java��d��到eclipse��目中去?下次写吧�?br /> 当你看到�q�句话的时候，你可以直接发邮�g向我索要win32��目和eclipse��目
BlogJava后台�~�辑器不好用�Q�^_^

Barrie 2008-05-06 14:40 发表评论

亚洲乱码日产精品a级毛片久久,33333在线亚洲,亚洲欧洲精品成人久久奇米网

Java�E�序如何限�?控制下蝲和上传速度)

openlayers���结(有参考项目代�?

中国各城市的�l�纬度数�?�_����到县�U�城�?

打造ICTCLAS JNI For Java

openlayers��结(有参考项目代�?

中国各城市的�l�纬度数�?�_��到县�U�城�?