使用Jsoup解决网页中图片链接问题
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在做Facebook和WhatsApp分享的时候,分享出去的谷歌短链,Facebook获取不到大图,和竞品展示的不一样,WhatsApp分享出去的短链没有图片和描述。
WhatsApp:
分析竞品UCNews,发现他们分享出去的WhatsApp链接指向的网页,在meat标签中添加了相关的属性,然后在自己的站中加入相关标签,问题解决。
<meta property="og:image" content="http://img.masala-sg.goldenmob.com/img/f6cb4bd725a7ab15dac6579f769a4c5f/i_0_mla_1480059457-608.jpg">
<meta property="twitter:image" content="http://img.masala-sg.goldenmob.com/img/f6cb4bd725a7ab15dac6579f769a4c5f/i_0_mla_1480059457-608.jpg">
Facebook:
通过多次测试,发现Facebook是根据分享的链接中网页中的图片的大小,从而进行不同形式的展现的。我原来使用的是480的中图,这里需要将网页中所有图片链接改为608的大图。因为使用的是阿里的OSS,图片在爬虫入库的时候都已经经过处理,不同的图片大小只是链接后缀不同,所以这里就涉及到了修改整个网页中图片的地址。
整个Conten是一个大的JSON,我在这边获取到之后,需要对tcontent中的内容进行解析,并替换。
{"image":[{"url":"http://img.masala-sg.goldenmob.com/img/7bf6da255a03b8b93ffa985957da34a1/i_0_95db3c9b23b5de19685ca86fd1707c5b-208","w":480,"h":216,"s":23092},{"url":"http://img.masala-sg.goldenmob.com/img/7bf6da255a03b8b93ffa985957da34a1/i_1_honeyjar-208.jpg","w":362,"h":331,"s":76833},{"url":"http://img.masala-sg.goldenmob.com/img/7bf6da255a03b8b93ffa985957da34a1/i_2_718fdc7d637fe88f31c77eb90d8e22a0-208","w":480,"h":274,"s":24234},{"url":"http://img.masala-sg.goldenmob.com/img/7bf6da255a03b8b93ffa985957da34a1/i_3_muchgarlicpowderequalsoneclovegarlic_5c49a0162-208","w":700,"h":394,"s":31888}],"tcontent":"<p> <img src=\\"http://img.masala-sg.goldenmob.com/img/7bf6da255a03b8b93ffa985957da34a1/i_0_95db3c9b23b5de19685ca86fd1707c5b-480\\"></p><p></p> <p></p>\\n<p>????? ?? ??? ?? ???? ?? ?????? ??? ??, ???? ???? ???? ????? ?? ??? ???? ?? ??? ???? ???? ???</p>\\n<p>??? ?? ?? ????? ????? ???? ??? ?? ???? ?? ??? ?? ???? ?? ???? ??? ??? ???? ???? ??, ???? ??? ???? ?? ?? ???? ??????? ??????? ????? ?? ??? ??? ??? ??????? ??????? ????? ?? ???? ?? ?? ????? ?? ?? ??? ?? ????????? ??? ???? ???? ?? ????? ?? ????? ??? ?? ????? ?? ??? ?? ?? ??? ???? ?? ???? ?? ?? ??????????? ?? ??? ???? ???? ?? ?? ?????? ?? ???? ??? ???</p>\\n<p><img src=\\"http://img.masala-sg.goldenmob.com/img/7bf6da255a03b8b93ffa985957da34a1/i_1_honeyjar-480.jpg\\"></p>\\n<p>??? ????? ?? ???? ???? 2-3 ???? ????? ?? ??? ?? ?????? ?? ??? ?? ??? ?????? ?? ??? ????? ????? ?????? ??? ???????? ??? ??? ??? ?? ???? ??? ?? ???? ??????, ????? ????? ??? ???? ??? ??? ???? ??? ??? ???? ???? ??? 7 ????? ?? ????? ?? ??? ?????? ????? ????? ?????? ?? ????? ??? ?? ?? ?????? ???? ???????? ?? ???????????? ?? ?? ???? ?? ??? ???? ??? ??? ?? ??? ???? ?? ??? ?? ?? ???? ???</p>\\n<p> <img src=\\"http://img.masala-sg.goldenmob.com/img/7bf6da255a03b8b93ffa985957da34a1/i_2_718fdc7d637fe88f31c77eb90d8e22a0-480\\"></p><p></p> <p></p>\\n<p>????? ?? ??? ?? ??? ?? ?? ??? ?? ?????? ?? ???? ?? ?? ??? ?? ??????? ??????? ?? ????? ?? ???? ??? ??????? ??????? ????? ???? ?? ???? ???? ?? ??? ?? ??? ???? ?? ?? ??? ??? ?????? ???? ????? ?? ?????? ?? ???? ?? ???? ?? ???? ???? ??????? ??? ??? ??? ???? ???? ??, ????? ??? ?? ?????? ??? ?????? ?? ???? ?? ????? ???? ??? ???? ???? ?? ??????? ???? ???</p>\\n<p>?? ?????? ?? ???? ?? ??? ?? ??????? ??? ???? ?? ???????? ????? ????-??????????? ??? ???? ?? ??? ?? ???? ?? ???? ?? ?? ???? ??? ??? ???? ?? ??????? ?? ??? ?? ??, ??? ???? ?????? ??????? ???? ???? ???? ????? ???????? ?? ????? ?? ??? ?? ??????? ?? ??????? ???? ???? ?? ?????-????? ?? ??? ????? ?? ????? ?? ???? ?? ?? ???? ???</p>\\n<p><img src=\\"http://img.masala-sg.goldenmob.com/img/7bf6da255a03b8b93ffa985957da34a1/i_3_muchgarlicpowderequalsoneclovegarlic_5c49a0162-480\\"></p>\\n<p>?? ?????? ???? ?? ????? ?????? ?? ?? ????????? ?? ??? ???? ??? ???? ?????????, ???? ?? ?? ????? ?? ???? ???? ???, ????? ??????????????? ????? ?? ??? ?? ?????? ??????????? ?? ??? ?? ?? ???? ?? ????? ??? ?? ?? ????????? ???????? ?????? ??, ???? ???? ?? ???? ?? ????? ?? ????? ?????? ???? ?????? ???</p>"}
初始方案:
直接使用String的replaceAll方法,将480替换成608,并且对没有后缀的图片链接添加.webp。在测试的时候发现没有任何问题,但是项目上线之后,OSS那边经常会出现如下错误。分析后发现,原来存在这样的情况<img src="xxx-480">这种图片没有后缀,在替换的时候只能替换480为608,但是无法添加上后缀,这样在网页进行访问的时候,浏览器请求图片地址会自动把后边的html代码带上去请求OSS。这种情况一般出现在印地语和马拉蒂语泰米尔语中,在content中还存在部分unicode编码,尝试过转码,正则,但是都不是很完美。
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改进后(使用jsoup):
改进后,使用了jsoup去解析整个HTML代码,然后获取到图片地址,在对其进行替换和添加后缀,完美解决问题。
public static String replaceImgOfContent(String content){ Document doc = Jsoup.parseBodyFragment(content); Elements img = doc.getElementsByTag("img"); for (Element link : img) { link.removeAttr("data-src"); link.removeAttr("data-lazy-src"); link.removeAttr("alt"); link.removeAttr("title"); link.removeAttr("src-set"); link.removeAttr("id"); link.removeAttr("class"); String linkHref = link.attr("src"); if(!linkHref.endsWith(".gif")){ if (linkHref.indexOf("masala-sg") > 0) { int size = linkHref.lastIndexOf("."); if (linkHref.length() - size < 10) { String im = linkHref.substring(size - 3, linkHref.lastIndexOf(".")); if (im.equals("480")) { String idu = linkHref.substring(linkHref.lastIndexOf("480"), linkHref.length()); linkHref = linkHref.replace(idu, "608.webp"); } } else { if (linkHref.endsWith("480")) { linkHref = linkHref.replaceAll("480","608"); linkHref = linkHref+".webp"; } } link.attr("src", linkHref); } } } content = doc.body().html().toString(); return content; }
jsoup Cookbook(中文版) : http://www.open-open.com/jsoup/
maven dependency:
<dependency> <groupId>org.jsoup</groupId> <artifactId>jsoup</artifactId> <version>1.10.2</version> </dependency>
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