需求：由于系统切换，要求将存在数据库中的网页内容中的img标签的src属性进行修补，举例：
content="<p><img title=\"122444234\" src=\"/files/post/122444234.jpg\"/><p>其他字符";
要求替换后为：
content="<p><img title=\"122444234\" src=\"http://xxx.xxx.com/files/post/122444234_500.jpg\" /><p>其他字符";
使用正则即可解决，代码如下
/** * 将img标签中的src进行二次包装 * @param content 内容 * @param replaceHttp 需要在src中加入的域名 * @param size 需要在src中将文件名加上_size * @return */ public static String repairContent(String content,String replaceHttp,int size){ String patternStr="<img\\s*([^>]*)\\s*src=\\\"(.*?)\\\"\\s*([^>]*)>"; Pattern pattern = Pattern.compile(patternStr,Pattern.CASE_INSENSITIVE); Matcher matcher = pattern.matcher(content); String result = content; while(matcher.find()) { String src = matcher.group(2); logger.debug("pattern string:"+src); String replaceSrc = ""; if(src.lastIndexOf(".")>0){ replaceSrc = src.substring(0,src.lastIndexOf("."))+"_"+size+src.substring(src.lastIndexOf(".")); } if(!src.startsWith("http://")&&!src.startsWith("https://")){ replaceSrc = replaceHttp + replaceSrc; } result = result.replaceAll(src,replaceSrc); } logger.debug(" content == " +content); logger.debug(" result == " + result); return result; }测试代码：
public static void main(String[] args) { String content = "<p><img title=\"10010001\" src=\"/files/post/10010001.gif\" width=\"200\" height=\"300\" />" + "</p><p><img title=\"10010002\" src=\"/files/post/10010002.gif\" width=\"500\" height=\"300\" /><p> </p>"+ "</p><p><img title=\"10010003\" src=\"/files/post/10010003.gif\" width=\"600\" height=\"300\" /><p> </p>"; String replaceHttp = "http://www.baidu.com"; int size = 500; String result = ApiUtil.repairContent(content, replaceHttp, size); System.out.println(result); }关键在于正则表达式：<img\\s*([^>]*)\\s*src=\\\"(.*?)\\\"\\s*([^>]*)>
特别是 ([^>]*) 不能用.*代替，否则只会从<img匹配到字符串最后一个">"符号为止，如果每个src的内容不一样，就只会替换最后一个src
实际操作代码如下：
是去掉了上面的size。
public class Test2 { public static void main(String[] args) { String content = "<img alt=\"\" src=\"http://img5.imgtn.bdimg.com/it/u=1310232405,2471553728&fm=27&gp=0.jpg\" />" + "法鲁文件a<img alt=\"\" src=\"upload/20180608145137.png\" />sfdsfds<img alt=\"\" src=\"upload/20180608145137.png\" />" + "afd<img alt=\"\" src=\"http://img5.imgtn.bdimg.com/it/u=1310232405,2471553728&fm=27&gp=0.jpg\" />" + "s的速度NS<a href=\"http://www.baidu.com\" target=\"_blank\">A看到你</a>" + "<img alt=\"\" src=\"http://img5.imgtn.bdimg.com/it/u=1310232405,2471553728&fm=27&gp=0.jpg\" />法鲁" + "文件a<img alt=\"\" src=\"upload/20180608145137.png\" />sfdsfds<img alt=\"\" src=\"upload/20180608145137.png\" />a" + "fd<img alt=\"\" src=\"http://img5.imgtn.bdimg.com/it/u=1310232405,2471553728&fm=27&gp=0.jpg\" />s的速度" + "NS<a href=\"http://www.baidu.com\" target=\"_blank\">A看到你</a>"; String replaceHttp = "http://xxx.xx.xxx.xxx:8089/xxbd/"; String result = repairContent(content, replaceHttp); System.out.println(result); } public static String repairContent(String content, String replaceHttp) { String patternStr = "<img\\s*([^>]*)\\s*src=\\\"(.*?)\\\"\\s*([^>]*)>"; Pattern pattern = Pattern.compile(patternStr, Pattern.CASE_INSENSITIVE); Matcher matcher = pattern.matcher(content); String result = content; while (matcher.find()) { String src = matcher.group(2); String img = matcher.group(0); String img2 = matcher.group(0); // System.out.println("pattern string:"+src); String replaceSrc = ""; if (!src.startsWith("http:")) { replaceSrc = replaceHttp + src; img = img.replaceAll(src, replaceSrc); result = result.replaceAll(img2, img); } } // System.out.println(" content == " +content); // System.out.println(" result == " + result); return result; }
}
