字符串xml中节点的特殊符号替换

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<xxx>
	<aaa> aa<82 ,bb<27 </aaa>
</xxx>

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public static String formatBeforeTrans(String data) {
        if ((data == null) | "".equals(data)) {
            return "";
        } else {
            data = data.replaceAll("\&", "&");
            data = data.replaceAll("\<", "&lt;");
            data = data.replaceAll("\>", "&gt;");
            data = data.replaceAll("\"", "&quot;");
            data = data.replaceAll("\'", "&apos;");
            data = data.replaceAll("\n", "STEAF_NEWLINE");
            return data;
        }
    }
public  static String regex(String xml) {
        //正则表达式
        String rgex =  ">(.*?)</";
        Pattern pattern = Pattern.compile(rgex);// 匹配的模式    
        Matcher m = pattern.matcher(xml);
        //匹配的有多个
        List<String> list = new ArrayList<String>();
        while (m.find()) {
        int i = 1;
            if (m.group(i).indexOf("//<")==-1 && m.group(i).indexOf("//>")==-1){
                xml = xml.replace(m.group(i), formatBeforeTrans(m.group(i)));
            }
        }
        return xml;
    }

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<xxx>
	<aaa> aa&lt;82 ,bb&lt;27 </aaa>
</xxx>