网络爬虫雏形1号_JAVA_编程开发_程序员俱乐部

?开始练习网络爬虫,先用httpclient抓取京东图片练练

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? 抓取类

class="java" name="code">DownImageAfter 

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package com.sreach.image;

import java.io.IOException;
import java.util.LinkedList;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.junit.Test;

/**
 * 处理下载链接目的获取图片链接地址(拿京东测试)
 * 
 * */
public class DownImageAfter {

	private static LinkedList<String> urlQueue1 = new LinkedList<String>();

	@Test
	public void test() throws Exception {
		String url = "http://search.jd.com/Search?keyword=php";
		String content = getHttpClentResult(url);
		getTwoEndLink(content);
		for (int i = 0; i < urlQueue1.size();) {
			String ra_url = urlQueue1.remove();
			String ts = getHttpClentResult(ra_url);
			String tss = getJD_end_Sevel_URL(ts);

			ImageDown.getResult(tss);
		}
	}

	/**
	 * 抓取京东最后一层的真实图片
	 * 
	 * @param content
	 * @return
	 * */
	private final static String getJD_end_Sevel_URL(String content) {
		// System.out.println(content);
		if (content.split("jqimg")[1].substring(0, 1).equals("\"")) {
			return content.split("\"jqimg\":\"")[1].split("\"")[0].replaceAll(
					"/", "").replaceAll("\\\\", "/");
		} else {
			String tes = content.split("jqimg=\"")[1].split("\"")[0];
			return tes;
		}

	}

	/**
	 * 根据url通过httpclent获取内容
	 * 
	 * @param url
	 * @return
	 * @throws IOException
	 * @throws ClientProtocolException
	 * */
	private final static String getHttpClentResult(String url)
			throws ClientProtocolException, IOException {
		HttpClient client = new DefaultHttpClient();
		HttpGet get$ = new HttpGet(url);

		get$.setHeader("User-Agent",
				"	Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Firefox/24.0");
		HttpResponse response = client.execute(get$);
		HttpEntity entity = response.getEntity();
		return EntityUtils.toString(entity);
	}

	/**
	 * 抓取后尾第二层链接到linked集合中
	 * */
	private final static void getTwoEndLink(String content) {
		String ts[] = content.split("<div class=\"p-name\">");

		for (int i = 1; i < ts.length; i++) {
			String t1 = ts[i].split("href=\"")[1].split("\"")[0];
			urlQueue1.addLast(t1);
		}
	}
}

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//具体图片下载

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ImageDown 

package com.sreach.image;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Random;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import com.sreach.util.StringUtil;

/** 图片测试下载 */
public class ImageDown {
	// 图片存储路径
	private final static String SAVEGB_PATH = "D:\\图片下载\\";

	// jpg格式
	private final static String IMAGEPATTEN_JPG = ".jpg";

	/**
	 * 根据链接后缀是否为图片作为判断
	 * 
	 * @param 文件原始超链接
	 * @return
	 * */
	public final static Boolean getResult(String imageUrlPath) {
		Boolean tag = false;

		if (imageUrlPath.endsWith(IMAGEPATTEN_JPG)) {
			tag = true;
			saveIMAGE(imageUrlPath);
		}
		return tag;
	}

	/**
	 * 通过超链接保存图片
	 * 
	 * @param 文件原始超链接
	 * */
	private final static void saveIMAGE(String imageUrlPath) {
		HttpClient client = new DefaultHttpClient();
		try {
			HttpGet get$ = new HttpGet(imageUrlPath);
			HttpResponse response = client.execute(get$);
			HttpEntity entity = response.getEntity();
			byte bs[] = null;
			if (entity != null) {
				bs = EntityUtils.toByteArray(entity);
			}

			StringBuilder bbs = new StringBuilder();

			bbs.append(SAVEGB_PATH).append(
					getImageSourceWebsite(imageUrlPath));

			File file = new File(bbs.toString());

			if (!file.exists()) {
				file.mkdir();
			}
			savePC_GB(getFileName(imageUrlPath, bbs.append("\\").toString()),
					bs);
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {

			e.printStackTrace();
		}
	}

	/**
	 * 保存图片到本地硬盘
	 * 
	 * @param filepath
	 *            文件路径,content 内容字节文件
	 * */
	private final static void savePC_GB(String filepath, byte[] content)
			throws IOException {
		File f = new File(filepath);
		if (f.exists()) {
			f = new File(filepath.replace(".jpg",
					Integer.toString(new Random().nextInt()) + ".jpg"));
		}
		BufferedOutputStream out = new BufferedOutputStream(
				new FileOutputStream(f));
		out.write(content);
		out.close();
		System.out.println("下载" + f.getName() + "图片成功");
	}

	/**
	 * 获取图片文件名
	 * 
	 * @原始文件链接地址(包含来源网站)
	 * @return
	 * */
	private final static String getFileName(String imageUrlPath,
			String realPath) {
		StringBuilder bs = new StringBuilder();
		bs.append(realPath);
		bs.append(StringUtil.getDateAndTime("YYYYMMddHHmmss"));
		bs.append("-");
		String path = getImageSourceWebsite(imageUrlPath);
		bs.append(path);
		bs.append(".jpg");
		return bs.toString();
	}

	public final static String getImageSourceWebsite(String imageUrlPath) {
		return imageUrlPath.split("http://")[1].split("/")[0];
	}

	public static void main(String[] args) {
		String imageUrlPath = "http://img12.360buyimg.com/n0/g14/M05/05/16/rBEhVVHmJ0YIAAAAAAHB_WJwDrkAABHIgOyzAcAAcIV854.jpg";
		getResult(imageUrlPath);

	}
}

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