<?xml version="1.0" encoding="UTF-8"?>
<library>

    <book>
        <name> <> Programming in ANSI C <> </name>
        <author> <>  Balaguruswamy <> </author>
        <comment> <> This comment may contain xml entities such as &,< and >. <> </comment>
    </book>

    <book>
        <name> <> A Mathematical Theory of Communication <> </name>
        <author> <> Claude E. Shannon <> </author>
        <comment> <> This comment also may contain xml entities. <> </comment>
    </book>

    <!-- This library contains more than ten thousand books. -->
</library>

XML字符串包含许多以<>开头和结尾的子字符串.子串可以包含XML实体,例如>,<,&,'和“.该方法需要用& gt;,& lt;,& amp;.&和&来代替它们.分别. Java中是否有任何正则表达式方法来完成此任务？