一、说明
背景：最近在做同步京东商品信息时遇到一个问题，同步后的商品详情无法在富文本中修改，强制修改会导致图片无法正常显示，研究发现详情中的图片是在css的作为背景图指定的。
解决：经过多次尝试，最后使用自定义HTML标签模板，提取css样式中background-image:url的图片地址和尺寸，并替换到自定义的模板中
技术：Java语言、正则表达式
二、代码
public static void main(String[] args) {
StringBuilder stringBuilder = new StringBuilder();
//商品详情
String goodsDesc = "<div cssurl='//sku-market-gw.jd.com/css/pc/100002519219.css?t=1581586700014'></div><div id='zbViewModulesH' value='4797'></div><input id='zbViewModulesHeight' type='hidden' value='4797'/><div skudesign=\\\"100010\\\"></div><div class=\\\"ssd-module-wrap\\\" >\\n <div id=\\\"ssd-vc-goods\\\" class=\\\"ssd-module ssd-module-goods M15541052686741\\\" data-id=\\\"M15541052686741\\\">\\n <ul class=\\\"ssd-goods-4\\\">\\n <li>\\n <a >\\n <div class=\\\"ssd-good-item\\\">\\n <div class=\\\"ssd-good-img\\\">\\n <img src=\\\"http://img30.360buyimg.com/n1/jfs/t26977/50/1495537803/456791/ca60d3de/5be4e374Nf8e94aa9.jpg\\\" alt=\\\"印尼进口 Tango威化饼干 进口威化饼干 零食礼盒 零食大礼包 潘多拉礼盒684g\\\"/>\\n </div>\\n <div class=\\\"ssd-good-info\\\">\\n <p class=\\\"ssd-good-name\\\">\\n 印尼进口 Tango威化饼干 进口威化饼干 零食礼盒 零食大礼包 潘多拉礼盒684g\\n </p>\\n </div>\\n </div>\\n </a>\\n </li>\\n <li>\\n <a >\\n <div class=\\\"ssd-good-item\\\">\\n <div class=\\\"ssd-good-img\\\">\\n <img src=\\\"http://img30.360buyimg.com/n1/jfs/t23938/203/1285847551/405421/27964aa9/5b57e55eN969c2d3f.jpg\\\" alt=\\\"印尼进口 Tango威化饼干 休闲零食 饼干 咔芙尔焦糖威化饼干73.5g\\\"/>\\n </div>\\n <div class=\\\"ssd-good-info\\\">\\n <p class=\\\"ssd-good-name\\\">\\n 印尼进口 Tango威化饼干 休闲零食 饼干 咔芙尔焦糖威化饼干73.5g\\n </p>\\n </div>\\n </div>\\n </a>\\n </li>\\n <li>\\n <a >\\n <div class=\\\"ssd-good-item\\\">\\n <div class=\\\"ssd-good-img\\\">\\n <img src=\\\"http://img30.360buyimg.com/n1/jfs/t28057/267/707899178/312718/1054f7be/5bfbda66Ne622ae83.jpg\\\" alt=\\\"印尼进口 Tango威化饼干 休闲零食 乳酪夹心威化饼干160g\\\"/>\\n </div>\\n <div class=\\\"ssd-good-info\\\">\\n <p class=\\\"ssd-good-name\\\">\\n 印尼进口 Tango威化饼干 休闲零食 乳酪夹心威化饼干160g\\n </p>\\n </div>\\n </div>\\n </a>\\n </li>\\n <li>\\n <a >\\n <div class=\\\"ssd-good-item\\\">\\n <div class=\\\"ssd-good-img\\\">\\n <img src=\\\"http://img30.360buyimg.com/n1/jfs/t24409/100/1278216587/342196/7f15ac48/5b580b36Nb9007958.jpg\\\" alt=\\\"印尼进口 Tango威化饼干 休闲零食 巧克力夹心威化饼干125g\\\"/>\\n </div>\\n <div class=\\\"ssd-good-info\\\">\\n <p class=\\\"ssd-good-name\\\">\\n 印尼进口 Tango威化饼干 休闲零食 巧克力夹心威化饼干125g\\n </p>\\n </div>\\n </div>\\n </a>\\n </li>\\n <li>\\n <a >\\n <div class=\\\"ssd-good-item\\\">\\n <div class=\\\"ssd-good-img\\\">\\n <img src=\\\"http://img30.360buyimg.com/n1/jfs/t1/26596/26/9557/317836/5c7f4fedE8e6d5730/940a4d2112e62fc3.jpg\\\" alt=\\\"印尼进口 Tango威化饼干 休闲零食 巧克力咔咔脆组合装320g（160g*2盒）\\\"/>\\n </div>\\n <div class=\\\"ssd-good-info\\\">\\n <p class=\\\"ssd-good-name\\\">\\n 印尼进口 Tango威化饼干 休闲零食 巧克力咔咔脆组合装320g（160g*2盒）\\n </p>\\n </div>\\n </div>\\n </a>\\n </li>\\n <li>\\n <a >\\n <div class=\\\"ssd-good-item\\\">\\n <div class=\\\"ssd-good-img\\\">\\n <img src=\\\"http://img30.360buyimg.com/n1/jfs/t1/16950/37/10436/362577/5c8741b5E238f9c4a/ad91f31e0b26302c.jpg\\\" alt=\\\"印尼进口 Tango威化饼干 休闲零食 咔咔脆威化饼干 泡泡糖味80g/盒\\\"/>\\n </div>\\n <div class=\\\"ssd-good-info\\\">\\n <p class=\\\"ssd-good-name\\\">\\n 印尼进口 Tango威化饼干 休闲零食 咔咔脆威化饼干 泡泡糖味80g/盒\\n </p>\\n </div>\\n </div>\\n </a>\\n </li>\\n <li>\\n <a >\\n <div class=\\\"ssd-good-item\\\">\\n <div class=\\\"ssd-good-img\\\">\\n <img src=\\\"http://img30.360buyimg.com/n1/jfs/t20488/87/2361646474/244765/b67e1c77/5b503ba8N075a3501.jpg\\\" alt=\\\"印尼进口 Tango威化饼干 休闲零食 咔咔脆威化饼干 牛奶味160g\\\"/>\\n </div>\\n <div class=\\\"ssd-good-info\\\">\\n <p class=\\\"ssd-good-name\\\">\\n 印尼进口 Tango威化饼干 休闲零食 咔咔脆威化饼干 牛奶味160g\\n </p>\\n </div>\\n </div>\\n </a>\\n </li>\\n <li>\\n <a >\\n <div class=\\\"ssd-good-item\\\">\\n <div class=\\\"ssd-good-img\\\">\\n <img src=\\\"http://img30.360buyimg.com/n1/jfs/t1/12175/32/10619/337857/5c8741e3E45420cc9/b3dab30dd73a7d8a.jpg\\\" alt=\\\"印尼进口 Tango威化饼干 休闲零食 咔咔脆威化饼干 草莓味80g/盒\\\"/>\\n </div>\\n <div class=\\\"ssd-good-info\\\">\\n <p class=\\\"ssd-good-name\\\">\\n 印尼进口 Tango威化饼干 休闲零食 咔咔脆威化饼干 草莓味80g/盒\\n </p>\\n </div>\\n </div>\\n </a>\\n </li>\\n </ul>\\n</div><div class=\\\"ssd-module M15518471203811 animate-M15518471203811\\\" data-id=\\\"M15518471203811\\\">\\n \\n</div>\\n<div class=\\\"ssd-module M15518471298134 animate-M15518471298134\\\" data-id=\\\"M15518471298134\\\">\\n \\n</div>\\n<div class=\\\"ssd-module M15518471291853 animate-M15518471291853\\\" data-id=\\\"M15518471291853\\\">\\n \\n</div>\\n<div class=\\\"ssd-module M15518471283932 animate-M15518471283932\\\" data-id=\\\"M15518471283932\\\">\\n \\n</div>\\n\\n</div>\\n<!-- 2019-07-01 10:02:50 --> \\n<style>.ssd-module-wrap{position:relative;margin:0 auto;width:750px;text-align:left;background-color:#fff}.ssd-module-wrap .ssd-module,.ssd-module-wrap .ssd-module-heading{width:750px;position:relative;overflow:hidden}.ssd-module-wrap .ssd-module{background-repeat:no-repeat;background-position:left top;background-size:100% 100%}.ssd-module-wrap .ssd-module-heading{background-repeat:no-repeat;background-position:left center;background-size:100% 100%}.ssd-module-wrap .ssd-module-heading .ssd-module-heading-layout{display:inline-block}.ssd-module-wrap .ssd-module-heading .ssd-widget-heading-ch{float:left;display:inline-block;margin:0 6px 0 15px;height:100%}.ssd-module-wrap .ssd-module-heading .ssd-widget-heading-en{float:left;display:inline-block;margin:0 15px 0 6px;height:100%}.ssd-module-wrap .ssd-widget-pic,.ssd-module-wrap .ssd-widget-text,.ssd-module-wrap .ssd-widget-line,.ssd-module-wrap .ssd-widget-rectangle,.ssd-module-wrap .ssd-widget-circle,.ssd-module-wrap .ssd-widget-triangle,.ssd-module-wrap .ssd-widget-table{position:absolute;overflow:hidden}.ssd-module-wrap .ssd-widget-rectangle{box-sizing:border-box;-moz-box-sizing:border-box;-webkit-box-sizing:border-box}.ssd-module-wrap .ssd-widget-table table{width:100%;height:100%}.ssd-module-wrap .ssd-widget-table td{position:relative;white-space:pre-line;word-break:break-all}.ssd-module-wrap .ssd-widget-pic img{display:block;width:100%;height:100%}.ssd-module-wrap .ssd-widget-text{line-height:1.5;word-break:break-all}.ssd-module-wrap .ssd-widget-text span{display:block;overflow:hidden;width:100%;height:100%;padding:0;margin:0;word-break:break-all;word-wrap:break-word;white-space:normal}.ssd-module-wrap .ssd-widget-link{position:absolute;left:0;top:0;width:100%;height:100%;background:transparent;z-index:100}.ssd-module-wrap .ssd-cell-text{position:absolute;top:0;left:0;right:0;width:100%;height:100%;overflow:auto}.ssd-module-wrap .M15541052686741{width:750px; height:492px}\\n.ssd-module-wrap .M15541052686741 ul {\\n padding: 5px;\\n line-height: 1.15;\\n background: #F3F4F7;\\n overflow: hidden;\\n}\\n\\n.ssd-module-wrap .M15541052686741 li {\\n list-style-type: none;\\n padding: 5px;\\n float: left;\\n -moz-box-sizing: border-box;\\n box-sizing: border-box;\\n}\\n\\n.ssd-module-wrap .M15541052686741 .ssd-goods-1 li {\\n width: 100%;\\n}\\n\\n.ssd-module-wrap .M15541052686741 .ssd-goods-2 li {\\n width: 50%;\\n}\\n\\n.ssd-module-wrap .M15541052686741 .ssd-goods-3 li {\\n width: 33.33%;\\n}\\n\\n.ssd-module-wrap .M15541052686741 .ssd-goods-4 li {\\n width: 25%;\\n}\\n\\n.ssd-module-wrap .M15541052686741 a {\\n display: block;\\n overflow: hidden;\\n}\\n\\n.ssd-module-wrap .M15541052686741 .ssd-good-item {\\n background-color: #fff;\\n}\\n\\n.ssd-module-wrap .M15541052686741 .ssd-good-img {\\n position: relative;\\n padding-top: 100%;\\n}\\n\\n.ssd-module-wrap .M15541052686741 .ssd-good-img img {\\n position: absolute;\\n top: 0;\\n left: 0;\\n width: 100%;\\n height: 100%;\\n}\\n\\n.ssd-module-wrap .M15541052686741 .ssd-good-info {\\n padding: 10px;\\n margin: 0;\\n}\\n\\n.ssd-module-wrap .M15541052686741 .ssd-good-name {\\n margin: 0;\\n height: 36px;\\n line-height: 18px;\\n font-size: 14px;\\n color: #333333;\\n display: -webkit-box;\\n overflow: hidden;\\n text-overflow: ellipsis;\\n -webkit-line-clamp: 2;\\n -webkit-box-orient: vertical; \\n}.ssd-module-wrap .M15518471203811{width:750px; background-color:#e9e9e9; background-size:100% 100%; background-image:url(http://img30.360buyimg.com/sku/jfs/t1/31717/2/4671/349535/5c7f4f07E899abe1e/9dd81eaf2aac0863.jpg); height:1083px}\\n.ssd-module-wrap .M15518471298134{width:750px; background-color:#e9e9e9; background-size:100% 100%; background-image:url(http://img30.360buyimg.com/sku/jfs/t1/14459/14/9500/215997/5c7f4f06E886e02de/9de0bdce8ff65b3c.jpg); height:786px}\\n.ssd-module-wrap .M15518471291853{width:750px; background-color:#e9e9e9; background-size:100% 100%; background-image:url(http://img30.360buyimg.com/sku/jfs/t1/25970/3/9647/494996/5c7f4f07E79829fc4/41a47699929ca408.jpg); height:1416px}\\n.ssd-module-wrap .M15518471283932{width:750px; background-color:#e9e9e9; background-size:100% 100%; background-image:url(http://img30.360buyimg.com/sku/jfs/t1/79600/29/3390/325766/5d196888Ee80899ac/6b260d5e4eab426d.jpg); height:1020px}\\n</style>";
//商品详情模板
String goodsDescTemplate = "<p><img src=%s data-width=750 data-height=%s /></p>";
//定义提取图片URL和height值的正则表达式，提取的字段用group的()语法
Pattern pattern = Pattern.compile("background-image:url\\((https?://.*)\\).*height:(\\d+)");
//研究原串后，先以尺寸进行分组
String[] split = goodsDesc.split("px}");
for (String s : split) {
if (s.contains("background-image:url")){ //过去掉不含背景图片的数据
Matcher matcher = pattern.matcher(s); //指定匹配器
while (matcher.find()){ //进行查找，并判断是否匹配
System.out.println("匹配到的字符串："+ matcher.group());
System.out.println("提取的图片地址："+ matcher.group(1));
System.out.println("提取的height值："+ matcher.group(2));
stringBuilder.append(String.format(goodsDescTemplate, matcher.group(1), matcher.group(2)));
}
}
}
System.out.println("拼接的字符串："+ stringBuilder);
}
三、打印日志
匹配到的字符串：background-image:url(http://img30.360buyimg.com/sku/jfs/t1/31717/2/4671/349535/5c7f4f07E899abe1e/9dd81eaf2aac0863.jpg); height:1083
提取的图片地址：http://img30.360buyimg.com/sku/jfs/t1/31717/2/4671/349535/5c7f4f07E899abe1e/9dd81eaf2aac0863.jpg
提取的height值：1083
匹配到的字符串：background-image:url(http://img30.360buyimg.com/sku/jfs/t1/14459/14/9500/215997/5c7f4f06E886e02de/9de0bdce8ff65b3c.jpg); height:786
提取的图片地址：http://img30.360buyimg.com/sku/jfs/t1/14459/14/9500/215997/5c7f4f06E886e02de/9de0bdce8ff65b3c.jpg
提取的height值：786
匹配到的字符串：background-image:url(http://img30.360buyimg.com/sku/jfs/t1/25970/3/9647/494996/5c7f4f07E79829fc4/41a47699929ca408.jpg); height:1416
提取的图片地址：http://img30.360buyimg.com/sku/jfs/t1/25970/3/9647/494996/5c7f4f07E79829fc4/41a47699929ca408.jpg
提取的height值：1416
匹配到的字符串：background-image:url(http://img30.360buyimg.com/sku/jfs/t1/79600/29/3390/325766/5d196888Ee80899ac/6b260d5e4eab426d.jpg); height:1020
提取的图片地址：http://img30.360buyimg.com/sku/jfs/t1/79600/29/3390/325766/5d196888Ee80899ac/6b260d5e4eab426d.jpg
提取的height值：1020
拼接的字符串：<p><img src=http://img30.360buyimg.com/sku/jfs/t1/31717/2/4671/349535/5c7f4f07E899abe1e/9dd81eaf2aac0863.jpg data-width=750 data-height=1083 /></p><p><img src=http://img30.360buyimg.com/sku/jfs/t1/14459/14/9500/215997/5c7f4f06E886e02de/9de0bdce8ff65b3c.jpg data-width=750 data-height=786 /></p><p><img src=http://img30.360buyimg.com/sku/jfs/t1/25970/3/9647/494996/5c7f4f07E79829fc4/41a47699929ca408.jpg data-width=750 data-height=1416 /></p><p><img src=http://img30.360buyimg.com/sku/jfs/t1/79600/29/3390/325766/5d196888Ee80899ac/6b260d5e4eab426d.jpg data-width=750 data-height=1020 /></p>