java 抓取网页图片
时间：2014-07-22 23:16:33
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import java.io.File;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLConnection;import java.text.SimpleDateFormat;import java.util.ArrayList;import
java.util.Iterator;import
java.util.List;import
java.util.UUID;import
java.util.regex.Matcher;import
java.util.regex.Pattern;/*** * java抓取网络图片 * * @author swinglife * */public
class CatchImage{ // 地址 // 编码 private
static final String ECODING = "UTF-8"; // 获取img标签正则 private
static final String IMGURL_REG = "<img.*src=(.*?)[^>]*?>"; // 获取src路径的正则 private
static final String IMGSRC_REG = "http:\"?(.*?)(\"|>|\\s+)"; private
static final String IMGDSRC_REG = "[\"\‘](http.+\\.(jpg|JPG|png|PNG|gif|GIF))[\"\‘]"; private
static final String[] picstuffix = { "jpg", "JPG", "gif", "GIF", "png", "PNG"
}; private
static List<String> pList = new
ArrayList<>(); public
static void main(String[] args) throws
Exception { CatchImage cm = new
CatchImage(); // 获得html文本内容 String HTML = cm.getHTML(URL); // System.out.println(HTML); // 获取图片标签 List<String> imgUrl = cm.getImageUrl(HTML); // 获取图片src地址 List<String> imgSrc = cm.getImageSrc(imgUrl); // 下载图片 cm.Download(imgSrc, "E:\\Imagesave"+saveDiff()); // cm.getImageSrc(HTML); // cm.ThreadDownload(imgSrc, "E:\\Imagesave"+saveDiff() , 6);// cm.TOThreadDownload(pList, "E:\\Imagesave" + saveDiff(), 6, 6000); } /*** * 获取HTML内容 * * @param url * @return * @throws Exception */ private
String getHTML(String url) throws
Exception { URL uri = new
URL(url); URLConnection connection = uri.openConnection(); InputStream in = connection.getInputStream(); byte[] buf = new
byte[1024]; int
length = 0; StringBuffer sb = new
StringBuffer(); while
((length = in.read(buf, 0, buf.length)) > 0) { sb.append(new
String(buf, ECODING)); } in.close(); return
sb.toString(); } /*** * 获取ImageUrl地址 * * @param HTML * @return */ private
List<String> getImageUrl(String HTML) { Matcher matcher = Pattern.compile(IMGURL_REG).matcher(HTML); List<String> listImgUrl = new
ArrayList<String>(); while
(matcher.find()) { listImgUrl.add(matcher.group()); } return
listImgUrl; } /*** * 获取ImageSrc地址 * * @param listImageUrl * @return */ private
List<String> getImageSrc(List<String> listImageUrl) { List<String> listImgSrc = new
ArrayList<String>(); for
(String image : listImageUrl) { Matcher matcher = Pattern.compile(IMGSRC_REG).matcher(image); while
(matcher.find()) { listImgSrc.add(matcher.group().substring(0, matcher.group().length() - 1)); } } return
listImgSrc; } /** * 获取html里面的图片 * * @param html * @return */ private
void getImageSrc(String html) { Pattern p = Pattern.compile(IMGDSRC_REG); Matcher m = p.matcher(html); while
(m.find()) { getpicsrc(m.group(1)); } } /** * 截取字符串里面的图片 * * @param src * @return */ public
void getpicsrc(String src) { if
(src.contains("http:")) { String[] app = src.split("http:"); for
(int i = 0; i < app.length; i++) { if
(!isBlank(app[i])) { for
(int j = 0; j < picstuffix.length; j++) { if
(app[i].contains("."
+ picstuffix[j])) { int
inum = app[i].indexOf(picstuffix[j]); String url = "http:"
+ app[i].substring(0, inum) + picstuffix[j]; pList.add(url); } } } } } } /** * 去处重复元素 * * @param result * @return */ public
static List<String> RemoveRepeated(List<String> result) { List<String> tmpArr = new
ArrayList<String>(); for
(int i = 0; i < result.size(); i++) { if
(!tmpArr.contains(result.get(i))) { tmpArr.add((String) result.get(i)); } } return
tmpArr; } /** * 判断非空 * * @param cs * @return */ public
static boolean isBlank(CharSequence cs) { int
strLen; if
(cs == null
|| (strLen = cs.length()) == 0) { return
true; } for
(int i = 0; i < strLen; i++) { if
(Character.isWhitespace(cs.charAt(i)) == false) { return
false; } } return
true; } /*** * 单线程下载图片 * * @param listImgSrc */ private
void Download(List<String> listImgSrc, String savedir) { for
(String url : listImgSrc) { try { String imageName = url.substring(url.lastIndexOf("/") + 1, url.length()); URL uri = new
URL(url); InputStream in = uri.openStream(); FileOutputStream fo = new
FileOutputStream(new
File(savedir + imageName)); byte[] buf = new
byte[1024]; int
length = 0; while
((length = in.read(buf, 0, buf.length)) != -1) { fo.write(buf, 0, length); } in.close(); fo.close(); System.out.println("*^_^*"); } catch
(Exception e) { System.out.println("-_-!"); } } } /** * 多线程下载图片 * * @param listImgSrc * @param savedir * @param tnum */ private
void ThreadDownload(List<String> listImgSrc, String savedir, int
tnum) { for
(int i = 0; i < listImgSrc.size(); i += tnum) { new
DThread(savedir, tnum, listImgSrc, i).start(); } } /** * * 2014-4-3上午10:52:38 Describe: 多线程下载照片 * * @author: ITWANG */ class
DThread extends
Thread { private
String savedir = null; private
int tnum; private
List<String> listImgSrc; private
int bunm; public
DThread(String savedir, int
tnum, List<String> listImgSrc, int
bnum) { this.savedir = savedir; this.tnum = tnum; this.listImgSrc = listImgSrc; this.bunm = bnum; } @Override public
void run() { for
(int i = 0; i < tnum; i++) { try { String url = listImgSrc.get(bunm + i); String sps = url.substring(url.lastIndexOf("."), url.length()); String imageName = UUID.randomUUID().toString() + sps; URL uri = new
URL(url); InputStream in = uri.openStream(); System.out.println(savedir + imageName); FileOutputStream fo = new
FileOutputStream(new
File(savedir + imageName)); byte[] buf = new
byte[1024]; int
length = 0; while
((length = in.read(buf, 0, buf.length)) != -1) { fo.write(buf, 0, length); } in.close(); fo.close(); System.out.println("*^_^*"); } catch
(Exception e) { System.out.println("-_-!"); } } } } /** * 多线程超时下载 * * @param listImgSrc * @param savedir * @param tnum * @param timeout */ private
void TOThreadDownload(List<String> listImgSrc, String savedir, int
tnum, int
timeout) { for
(int i = 0; i < listImgSrc.size(); i += tnum) { new
TODThread(savedir, tnum, listImgSrc, i, timeout).start(); } } /** * * 2014-4-3上午10:52:07 Describe: 超时方式下载照片线程 * * @author: ITWANG */ class
TODThread extends
Thread { private
String savedir = null; private
int tnum; private
List<String> listImgSrc; private
int bunm; private
int timeout = 3000; public
TODThread(String savedir, int
tnum, List<String> listImgSrc, int
bnum, int
timeout) { this.savedir = savedir; this.tnum = tnum; this.listImgSrc = listImgSrc; this.bunm = bnum; this.timeout = timeout; } @Override public
void run() { for
(int i = 0; i < tnum; i++) { String url = listImgSrc.get(bunm + i); String sps = url.substring(url.lastIndexOf("."), url.length()); String imageName = UUID.randomUUID().toString() + sps; try { if
(getPic(url, savedir, imageName, timeout)) { System.out.println("*^_^*"); } else { System.out.println("-_-!"); } } catch
(Exception e) { System.out.println("下载异常"); } } } } /** * GET方式下载照片 * * @param purl * @param folder * @param filename * @param timeout * @return * @throws Exception */ public
boolean getPic(String purl, String folder, String filename, int
timeout) throws
Exception { URL url = new
URL(purl); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(timeout); conn.setRequestMethod("GET"); conn.setDoOutput(true); conn.setDoInput(true); if
(conn.getResponseCode() == 200) { InputStream is = conn.getInputStream(); byte[] bs = new
byte[1024]; int
len; File sf = new
File(folder); if
(!sf.exists()) { sf.mkdirs(); } OutputStream os = new
FileOutputStream(sf.getPath() + "\\"
+ filename); while
((len = is.read(bs)) != -1) { os.write(bs, 0, len); } os.close(); is.close(); return
true; } return
false; } /** * 时间文件夹 * * @return */ public
static String saveDiff() { SimpleDateFormat formate = new
SimpleDateFormat("yyyy-MM-dd-HH-mm-ss"); return
"\\" + formate.format(System.currentTimeMillis()) + "\\"; }} |
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