一个简单网络爬虫示例(转载)

在学生时期，可能听到网络爬虫这个词会觉得很高大上，但是它的简单实现可能学生都不难懂。
网络爬虫应用，就是把整个互联网真的就当做一张网，像蜘蛛网那样，应用就像一个虫子，在网上面按照一定的规则爬动。
现在互联网应用最广的就是http(s)协议了，本文例子就是基于使用http(s)协议的，只作为示例，不涉及复杂的算法（实际上是最重要的）。

设计思路： 
程序入口从一个或多个url开始，通过http(s)获取url的内容，对获取到内容处理，获取内容中需要爬取的信息，获取到内容中的url链接，再重复以上步骤。 
不多说，详情看代码已经注释：

/**
 * 功能概要：主程序
 *
 * @author hwz
 */
public class MainApp {

    private Integer corePoolSize = 10;

    private Integer maxPoolSize = 20;

    private ThreadPoolExecutor executor;

    /** 工作队列 */
    private SpiderQueue workQueue;

    public void start(String url) throws Exception {
        //初始化线程池
        LinkedBlockingDeque<Runnable> executorQueue = new LinkedBlockingDeque<Runnable>(maxPoolSize);
        executor = new ThreadPoolExecutor(corePoolSize, maxPoolSize, 60L, TimeUnit.SECONDS, 
                executorQueue);

        workQueue = new SpiderQueue(1024);
        SpiderUrl spiderUrl = new SpiderUrl(url, 0);
        try {
            workQueue.add(spiderUrl);
        }
        catch (Exception e) {
            System.out.println("insert url into workQueue error,url=" + url);
            e.printStackTrace();
        }

        //提交第一个执行任务
       executor.submit(new SimpleSpider(workQueue, "thread-" + "main"));
       int i=0;
       int idle = 0;
       while(true) {
           //判断是否增加更多线程执行任务
           if (workQueue.size() > 20 && executor.getActiveCount() < maxPoolSize) {
               idle = 0;
               System.out.println("submit new thread,workQueue.size=" + workQueue.size() + 
                       ",executorQueue.activeCount=" + executor.getActiveCount() + ",i=" + i);
               executor.submit(new SimpleSpider(workQueue, "thread-" + i++));
               Thread.sleep(500);
           }
           else if (workQueue.size() == 0){
               idle++;
               System.out.println("main method, idle times=" + idle);

               //主线程空闲20次，结束运行
               if (idle > 20) {
                   System.out.println("main method, idle times=" + idle + ",end!");
                   break;
               }
               Thread.sleep(1000);
           }
           else {
               Thread.sleep(2000);
           }
       }
       System.out.println("End!,workQueue.size=" + workQueue.size() + 
                       ",executorQueue.activeCount=" + executor.getActiveCount() + ",executorQueue.CompletedTaskCount" +
               executor.getCompletedTaskCount() +  ",i=" + i);
       workQueue.printAll();
       executor.shutdown();
       System.exit(0);
    }

    public static void main(String[] args) throws Exception {

        MainApp app = new MainApp();
        app.start("http://www.csdn.net/");
    }
}


/**
 * 
 * 功能概要：自定义爬虫工作同步队列，使用ArrayList实现
 *
 * @author hwz
 */publicclass SpiderQueue {/** 存储器 */private List<SpiderUrl> queue;

    publicSpiderQueue(int size) {
        queue = new ArrayList<SpiderUrl>(size);
    }

    publicsynchronizedvoidadd(SpiderUrl spiderUrl) {
        queue.add(spiderUrl);
    }

    publicsynchronized SpiderUrl poll() {
        if (queue.isEmpty()) {
            returnnull;
        }
        //控制台打印结果，方便查看
        SpiderUrl spiderUrl = queue.remove(0);
        System.out.println("SpiderQueue,poll,SpiderUrl=" + spiderUrl.toString() + ",remain size=" + queue.size());
        return spiderUrl;
    }

    publicsynchronized SpiderUrl peek() {
        if (queue.isEmpty()) {
            returnnull;
        }
        return queue.get(0);
    }

    publicsynchronizedbooleanisExsit(SpiderUrl spiderUrl) {
        return queue.contains(spiderUrl);
    }

    publicsynchronizedintsize() {
        return queue.size();
    }

    publicvoidprintAll() {
        System.out.println("Enter printAll.");
        for (SpiderUrl spiderUrl : queue) {
            System.out.println(spiderUrl);
        }
    }
}



/**
 * 
 * 功能概要：爬虫工作的url
 *
 * @author hwz
 */publicclass SpiderUrl {/** http(s) url */private String url;

    /** 该url是入口url的第几层  */privateint deep;

    publicSpiderUrl(String url, int deep) {
        this.url = url;
        this.deep = deep;
    }

    public String getUrl() {
        return url;
    }

    publicvoidsetUrl(String url) {
        this.url = url;
    }

    publicintgetDeep() {
        return deep;
    }

    publicvoidsetDeep(int deep) {
        this.deep = deep;
    }

    @Overridepublicbooleanequals(Object obj) {
        if (!(obj instanceof SpiderUrl)) {
            returnfalse;
        }
        SpiderUrl oth = (SpiderUrl) obj;
        returnthis.url.equals(oth.getUrl());
    }

    @OverridepublicinthashCode() {
        return url.hashCode();
    }

    @Overridepublic String toString() {
        return getClass().toString() + "[url:" + url + ",deep:" + deep +"]";
    }
}

/**
 * 
 * 功能概要：爬虫工作类，主要实现类
 *
 * @author hwz
 */publicclass SimpleSpider implements Runnable{private String threadName;

    private SpiderUrl url;

    private SpiderQueue workQueue;

    publicSimpleSpider(SpiderQueue workQueue, String threadName) {
        this.workQueue = workQueue;
        this.threadName = threadName;
    }

    @Overridepublicvoidrun() {
        System.out.println(threadName + " start run");
        //连续空闲10次循环，结束任务int idle = 0;
        while (idle < 10) {
            url = workQueue.poll();
            if (url != null) {
                //url 解析
                parseUrl(url);
                idle = 0;
            }
            else {
                System.out.println(threadName + " idle...,times=" + idle++);
                try {
                    Thread.sleep(1000);
                }
                catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
        System.out.println(threadName + " end run...");
    }

    /**
     * url解析
     * @param url
     * @return void
     */privatevoidparseUrl(SpiderUrl url) {
        if (url == null) {
            return;
        }
        try {
            int deep = url.getDeep() + 1;
            URL netUrl = new URL(url.getUrl());
            URLConnection connection = netUrl.openConnection();
            String contentType = connection.getContentType();
            //获取内容
            String resource = getResource(connection);
            //获取标题
            String title = getTitle(resource);
            //获取链接
            List<String> urls = getUrls(resource);
            System.out.println(threadName +  ",parseUrl url=" + url + ",contentType=" + contentType + ",title=" + title + ",urls=" + urls);
            //控制爬取链接层数，如果获取到的url全部加入工作队列，将会是指数级增加，最后程序挂掉if (deep < 3) {
                SpiderUrl newUrl;
                for (String u : urls) {
                    newUrl = new SpiderUrl(u,deep);
                    if(!workQueue.isExsit(newUrl)) {
                        workQueue.add(newUrl);
                    }
                }
            }
        }
        catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 读取http url 内容
     * @param connection
     * @return
     * @return String
     */private String getResource(URLConnection connection) {
        if (connection == null) {
            returnnull;
        }
        StringBuilder sb = new StringBuilder();
        try {
            InputStream inputStream = connection.getInputStream();
            InputStreamReader isr = new InputStreamReader(inputStream, "UTF-8");
            int input;
            while ( (input = isr.read()) != -1) {
                sb.append((char)input);
            }
        }
        catch (IOException e) {
            System.out.println(threadName + ",get resource error,connection=" + connection);
        }
        return sb.toString();
    }

    /**
     * 从url内容获取标题
     * @param content
     * @return
     * @return String
     */private  String getTitle(String content) {
        if (content == null) {
            returnnull;
        }
        Pattern pattern = Pattern.compile("(<title>.{1,}</title>)");
        Matcher matcher = pattern.matcher(content);
        String title = null;
        if (matcher.find()) {
            title = matcher.group(0).replaceAll("<title>", "").replaceAll("</title>", "");
        }
        return title;
    }

    /**
     * 从url内容中获取存在的url链接
     * @param content
     * @return
     * @return List<String>
     */private  List<String> getUrls(String content) {
        if (content == null) {
            returnnull;
        }
        Pattern pattern = Pattern.compile("(<a.{1,}?href=['"]?[a-zA-z]+:\/\/[^\s]*?[\s>]{1})");
        Matcher matcher = pattern.matcher(content);
        String a;
        String lastChar;
        List<String> links = new ArrayList<String>();
        while (matcher.find()) {
            a = matcher.group(0).replaceAll("<a.{1,}?href=['"]?", "");
            a = a.trim();
            lastChar = a.substring(a.length()-1);
            if (lastChar.equals("'") || lastChar.equals(""") || lastChar.equals(">")) {
                a = a.substring(0,a.length()-1);
            }
            links.add(a);
        }
        return links;
    }
}
在学生时期，可能听到网络爬虫这个词会觉得很高大上，但是它的简单实现可能学生都不难懂。
网络爬虫应用，就是把整个互联网真的就当做一张网，像蜘蛛网那样，应用就像一个虫子，在网上面按照一定的规则爬动。
现在互联网应用最广的就是http(s)协议了，本文例子就是基于使用http(s)协议的，只作为示例，不涉及复杂的算法（实际上是最重要的）。

设计思路： 
程序入口从一个或多个url开始，通过http(s)获取url的内容，对获取到内容处理，获取内容中需要爬取的信息，获取到内容中的url链接，再重复以上步骤。 
不多说，详情看代码已经注释：

/**
 * 功能概要：主程序
 *
 * @author hwz
 */
public class MainApp {

    private Integer corePoolSize = 10;

    private Integer maxPoolSize = 20;

    private ThreadPoolExecutor executor;

    /** 工作队列 */
    private SpiderQueue workQueue;

    public void start(String url) throws Exception {
        //初始化线程池
        LinkedBlockingDeque<Runnable> executorQueue = new LinkedBlockingDeque<Runnable>(maxPoolSize);
        executor = new ThreadPoolExecutor(corePoolSize, maxPoolSize, 60L, TimeUnit.SECONDS, 
                executorQueue);

        workQueue = new SpiderQueue(1024);
        SpiderUrl spiderUrl = new SpiderUrl(url, 0);
        try {
            workQueue.add(spiderUrl);
        }
        catch (Exception e) {
            System.out.println("insert url into workQueue error,url=" + url);
            e.printStackTrace();
        }

        //提交第一个执行任务
       executor.submit(new SimpleSpider(workQueue, "thread-" + "main"));
       int i=0;
       int idle = 0;
       while(true) {
           //判断是否增加更多线程执行任务
           if (workQueue.size() > 20 && executor.getActiveCount() < maxPoolSize) {
               idle = 0;
               System.out.println("submit new thread,workQueue.size=" + workQueue.size() + 
                       ",executorQueue.activeCount=" + executor.getActiveCount() + ",i=" + i);
               executor.submit(new SimpleSpider(workQueue, "thread-" + i++));
               Thread.sleep(500);
           }
           else if (workQueue.size() == 0){
               idle++;
               System.out.println("main method, idle times=" + idle);

               //主线程空闲20次，结束运行
               if (idle > 20) {
                   System.out.println("main method, idle times=" + idle + ",end!");
                   break;
               }
               Thread.sleep(1000);
           }
           else {
               Thread.sleep(2000);
           }
       }
       System.out.println("End!,workQueue.size=" + workQueue.size() + 
                       ",executorQueue.activeCount=" + executor.getActiveCount() + ",executorQueue.CompletedTaskCount" +
               executor.getCompletedTaskCount() +  ",i=" + i);
       workQueue.printAll();
       executor.shutdown();
       System.exit(0);
    }

    public static void main(String[] args) throws Exception {

        MainApp app = new MainApp();
        app.start("http://www.csdn.net/");
    }
}
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/**
 * 
 * 功能概要：自定义爬虫工作同步队列，使用ArrayList实现
 *
 * @author hwz
 */
public class SpiderQueue {

    /** 存储器 */
    private List<SpiderUrl> queue;

    public SpiderQueue(int size) {
        queue = new ArrayList<SpiderUrl>(size);
    }

    public synchronized void add(SpiderUrl spiderUrl) {
        queue.add(spiderUrl);
    }

    public synchronized SpiderUrl poll() {
        if (queue.isEmpty()) {
            return null;
        }
        //控制台打印结果，方便查看
        SpiderUrl spiderUrl = queue.remove(0);
        System.out.println("SpiderQueue,poll,SpiderUrl=" + spiderUrl.toString() + ",remain size=" + queue.size());
        return spiderUrl;
    }

    public synchronized SpiderUrl peek() {
        if (queue.isEmpty()) {
            return null;
        }
        return queue.get(0);
    }

    public synchronized boolean isExsit(SpiderUrl spiderUrl) {
        return queue.contains(spiderUrl);
    }

    public synchronized int size() {
        return queue.size();
    }

    public void printAll() {
        System.out.println("Enter printAll.");
        for (SpiderUrl spiderUrl : queue) {
            System.out.println(spiderUrl);
        }
    }
}
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/**
 * 
 * 功能概要：爬虫工作的url
 *
 * @author hwz
 */
public class SpiderUrl {

    /** http(s) url */
    private String url;

    /** 该url是入口url的第几层  */
    private int deep;

    public SpiderUrl(String url, int deep) {
        this.url = url;
        this.deep = deep;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public int getDeep() {
        return deep;
    }

    public void setDeep(int deep) {
        this.deep = deep;
    }

    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof SpiderUrl)) {
            return false;
        }
        SpiderUrl oth = (SpiderUrl) obj;
        return this.url.equals(oth.getUrl());
    }

    @Override
    public int hashCode() {
        return url.hashCode();
    }

    @Override
    public String toString() {
        return getClass().toString() + "[url:" + url + ",deep:" + deep +"]";
    }
}
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/**
 * 
 * 功能概要：爬虫工作类，主要实现类
 *
 * @author hwz
 */
public class SimpleSpider implements Runnable{

    private String threadName;

    private SpiderUrl url;

    private SpiderQueue workQueue;

    public SimpleSpider(SpiderQueue workQueue, String threadName) {
        this.workQueue = workQueue;
        this.threadName = threadName;
    }

    @Override
    public void run() {
        System.out.println(threadName + " start run");
        //连续空闲10次循环，结束任务
        int idle = 0;
        while (idle < 10) {
            url = workQueue.poll();
            if (url != null) {
                //url 解析
                parseUrl(url);
                idle = 0;
            }
            else {
                System.out.println(threadName + " idle...,times=" + idle++);
                try {
                    Thread.sleep(1000);
                }
                catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
        System.out.println(threadName + " end run...");
    }

    /**
     * url解析
     * @param url
     * @return void
     */
    private void parseUrl(SpiderUrl url) {
        if (url == null) {
            return;
        }
        try {
            int deep = url.getDeep() + 1;
            URL netUrl = new URL(url.getUrl());
            URLConnection connection = netUrl.openConnection();
            String contentType = connection.getContentType();
            //获取内容
            String resource = getResource(connection);
            //获取标题
            String title = getTitle(resource);
            //获取链接
            List<String> urls = getUrls(resource);
            System.out.println(threadName +  ",parseUrl url=" + url + ",contentType=" + contentType + ",title=" + title + ",urls=" + urls);
            //控制爬取链接层数，如果获取到的url全部加入工作队列，将会是指数级增加，最后程序挂掉
            if (deep < 3) {
                SpiderUrl newUrl;
                for (String u : urls) {
                    newUrl = new SpiderUrl(u,deep);
                    if(!workQueue.isExsit(newUrl)) {
                        workQueue.add(newUrl);
                    }
                }
            }
        }
        catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 读取http url 内容
     * @param connection
     * @return
     * @return String
     */
    private String getResource(URLConnection connection) {
        if (connection == null) {
            return null;
        }
        StringBuilder sb = new StringBuilder();
        try {
            InputStream inputStream = connection.getInputStream();
            InputStreamReader isr = new InputStreamReader(inputStream, "UTF-8");
            int input;
            while ( (input = isr.read()) != -1) {
                sb.append((char)input);
            }
        }
        catch (IOException e) {
            System.out.println(threadName + ",get resource error,connection=" + connection);
        }
        return sb.toString();
    }

    /**
     * 从url内容获取标题
     * @param content
     * @return
     * @return String
     */
    private  String getTitle(String content) {
        if (content == null) {
            return null;
        }
        Pattern pattern = Pattern.compile("(<title>.{1,}</title>)");
        Matcher matcher = pattern.matcher(content);
        String title = null;
        if (matcher.find()) {
            title = matcher.group(0).replaceAll("<title>", "").replaceAll("</title>", "");
        }
        return title;
    }

    /**
     * 从url内容中获取存在的url链接
     * @param content
     * @return
     * @return List<String>
     */
    private  List<String> getUrls(String content) {
        if (content == null) {
            return null;
        }
        Pattern pattern = Pattern.compile("(<a.{1,}?href=['"]?[a-zA-z]+:\/\/[^\s]*?[\s>]{1})");
        Matcher matcher = pattern.matcher(content);
        String a;
        String lastChar;
        List<String> links = new ArrayList<String>();
        while (matcher.find()) {
            a = matcher.group(0).replaceAll("<a.{1,}?href=['"]?", "");
            a = a.trim();
            lastChar = a.substring(a.length()-1);
            if (lastChar.equals("'") || lastChar.equals(""") || lastChar.equals(">")) {
                a = a.substring(0,a.length()-1);
            }
            links.add(a);
        }
        return links;
    }
}
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该代码示例，旨在说明一个简单的爬虫，关于多线程和http的处理没有过多考虑，如存在错误，请指出。

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原文地址：https://www.cnblogs.com/zqyanywn/p/5979971.html