学习sax解析xml

xml文件内容：

<?xml version="1.0" encoding="utf-8"?>
<persons>
    <person id = "23">
        <name>张老师</name>
        <age>21</age>
    </person>
    
    <person id = "20">
        <name>李老师</name>
        <age>25</age>
    </person>
</persons>

打印的解析结果：

function startDocument: init list

function startElement: index 0 attributes qname:id value:23
function characters: tag:name value:张老师
function characters: tag:age value:21
function endElement: list.add(map)
function startElement: index 0 attributes qname:id value:20
function characters: tag:name value:李老师
function characters: tag:age value:25
function endElement: list.add(map)
{id=23, age=21, name=张老师}

{id=20, age=25, name=李老师}