Java Web入门--XML入门

什么是XML

XML的用途： 1.Java程序中XML作为配置描述文件

2.用于保存程序产生的数据（XML是非常好的数据载体）

3.网络间的数据传输

XML与HXML的区别

XML 以文件形式保存数据，没有预置的标签，标签自己定义,HTML有大量的预定义标签‘

XML重在保存与传输数据，HTML用于显示信息；

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XMLd的文档结构

hr.dtd

<?xml version="1.0" encoding="UTF-8"?>
<!ELEMENT hr (employee+)>
<!ELEMENT employee (name,age,salary,department)>
<!ATTLIST employee no CDATA "">
<!ELEMENT name (#PCDATA)>
<!ELEMENT age (#PCDATA)>
<!ELEMENT salary (#PCDATA)>
<!ELEMENT department (dname,address)>
<!ELEMENT dname (#PCDATA)>
<!ELEMENT address (#PCDATA)>

hr.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hr SYSTEM "hr.dtd">
<!-- 人力资源管理系统 -->
<hr>
	<employee no="3301">
		<name>李铁柱</name>
		<age>37</age>
		<salary>3600</salary>
		<department>
			<dname>人事部</dname>
			<address>XX大厦-B105</address>
		</department>
	</employee>
	<employee no="3302">
		<name>林海</name>
		<age>50</age>
		<salary>7000</salary>
		<department>
			<dname>财务部</dname>
			<address>XX大厦-B106</address>
		</department>
	</employee>
	<employee no="3303">
		<name>安娜</name>
		<age>24</age>
		<salary>4600</salary>
		<department>
			<dname>人事部</dname>
			<address>XX大厦-B105</address>
		</department>
	</employee>
	<employee no="3304">
		<name>张晓宇</name>
		<age>29</age>
		<salary>3000</salary>
		<department>
			<dname>后勤部</dname>
			<address>XX大厦-B108</address>
		</department>
	</employee>

	<employee no="3305">
		<name>赵子轩</name>
		<age>19</age>
		<salary>1500</salary>
		<department>
			<dname>后勤部</dname>
			<address>XX大厦-B108</address>
		</department>
	</employee>

	<employee no="3306">
		<name>张晓璇</name>
		<age>20</age>
		<salary>1700</salary>
		<department>
			<dname>后勤部</dname>
			<address>XX大厦-B108</address>
		</department>
	</employee>
	<employee no="3307">
		<name>张檬</name>
		<age>43</age>
		<salary>8700</salary>
		<department>
			<dname>会计部</dname>
			<address>XX大厦-B103</address>
		</department>
	</employee>
	<employee no="3308">
		<name>李梅</name>
		<age>33</age>
		<salary>8700</salary>
		<department>
			<dname>工程部</dname>
			<address>XX大厦-B104</address>
		</department>
	</employee>
	<employee no="3309">
		<name>张三</name>
		<age>31</age>
		<salary>4000</salary>
		<department>
			<dname>会计部</dname>
			<address>XX大厦-B103</address>
		</department>
	</employee>
	<employee no="3310">
		<name>李四</name>
		<age>23</age>
		<salary>3000</salary>
		<department>
			<dname>工程部</dname>
			<address>XX大厦-B104</address>
		</department>
	</employee>
</hr>