邮件链接替换

// 将href外站的链接换为302跳转
    public static String formatA(String src, String patternStr, String replace) {
        if (StringUtil.isBlank(src) || StringUtil.isBlank(patternStr) || StringUtil.isBlank(replace)) {
            return src;
        }
        
        // html的标签属性肯定是以单引号或双引号包含
        Pattern p = Pattern.compile(patternStr, Pattern.CASE_INSENSITIVE);
        Matcher m = p.matcher(src);
        while (m.find()) {
            String a = m.group();
            // 本站内部链接不处理
            /*if (a.contains("javaniu") || a.contains("zuidaima") || a.contains("javascript:void") || a.matches("href=['|"]?\/")) {
                continue;
            }*/
            String _url = m.group(2);
            String url = _url;

            try {
                url = URLEncoder.encode(_url, "utf-8");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            url = String.format(replace, url);
            // 将target属性替换为""，以便所有外链都是_blank打开
            String targetReg = "target=['|"].*?['|"']";
            String prefix = m.group(1).replaceAll(targetReg, "");
            String suffix = m.group(3).replaceAll(targetReg, "");
            // 整段匹配不会出现错误
            String _a = "<a" + prefix + " href='" + url + "'" + suffix + " target='_blank'>";
            src = src.replace(a, _a);
        }
        
        return src;
    }


    // 将添加的链接去除
    public static String formatABackUp(String src, String patternStr) {
        if (StringUtil.isBlank(src) || StringUtil.isBlank(patternStr)) {
            return src;
        }

        // html的标签属性肯定是以单引号或双引号包含
        Pattern p = Pattern.compile(patternStr, Pattern.CASE_INSENSITIVE);
        Matcher m = p.matcher(src);
        while (m.find()) {
            String a = m.group();
            // 本站内部链接不处理
            /*if (a.contains("javaniu") || a.contains("zuidaima") || a.contains("javascript:void") || a.matches("href=['|"]?\/")) {
                continue;
            }*/
            String _url = m.group(2);
            String url = _url;

            try {
                url = URLDecoder.decode(_url, "utf-8");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            //https://tj422637.onloon.co/callback/mail/trace/hit?messageID=mid:4191b2fd09274c4ba4e6811c26dc95c4&extMessageID=extmid:21147d3a3cb14687afb9b48e28f6f879&redirect_url=https%3A%2F%2Fwww.baidu.com%2F
//            url = String.format(replace, url);
            url = url.substring(url.indexOf("redirect_url=") + 13);
            // 将target属性替换为""，以便所有外链都是_blank打开
            String targetReg = "target=['|"].*?['|"']";
            String prefix = m.group(1).replaceAll(targetReg, "");
            String suffix = m.group(3).replaceAll(targetReg, "");
            // 整段匹配不会出现错误
            String _a = "<a" + prefix + " href='" + url + "'" + suffix + ">";
            src = src.replace(a, _a);
        }

        return src;
    }

public static void main(String[] args) {
        String replace = "http://trace" + "?messageID=" + "123";
        if (StringUtil.isNotBlank("456")) {
            replace += "&extMessageID=" + "456";
        }
        replace += "&redirect_url=%s";

        String src = "<table width="100%" border="0" cellspacing="0" cellpadding="0" bgcolor="#fff" style="text-align: left"><tbody><tr><td valign="top" style="100%;"><p style="font-size:18px;line-height:30px;text-align:justify;">本周五务必上线，<a href="http://www.baidu.com">如有问题</a>，及时通知！</p></td></tr><tr height="20"></tr></tbody></table>";
        //添加链接
        src = formatA(src, A_HREF_URL, replace);
        System.out.println(src);
        //去除链接
        src = formatABackUp(src, A_HREF_URL);
        System.out.println(src);
    }

<table width="100%" border="0" cellspacing="0" cellpadding="0" bgcolor="#fff" style="text-align: left"><tbody><tr><td valign="top" style="100%;"><p style="font-size:18px;line-height:30px;text-align:justify;">本周五务必上线，<a href='http://trace?messageID=123&extMessageID=456&redirect_url=http%3A%2F%2Fwww.baidu.com' target='_blank'>如有问题</a>，及时通知！</p></td></tr><tr height="20"></tr></tbody></table>
<table width="100%" border="0" cellspacing="0" cellpadding="0" bgcolor="#fff" style="text-align: left"><tbody><tr><td valign="top" style="100%;"><p style="font-size:18px;line-height:30px;text-align:justify;">本周五务必上线，<a href='http://www.baidu.com'  target='_blank'>如有问题</a>，及时通知！</p></td></tr><tr height="20"></tr></tbody></table>