JDOM

JDOM是什么：

To provide a complete, Java-based solution for accessing, manipulating, and outputting XML data from Java code.

JDOM与其他几种XML解析工具的比较：

DOM VS SAX VS JDOM VS DOM4J: http://www.cnblogs.com/lanxuezaipiao/archive/2013/05/17/3082949.html

结合文章的结论，对于小型xml文件， 而且调用不频繁的操作， 可以直接使用JDOM来完成。

示例：

以idc解析xml为例

xml：

<?xml version="1.0" encoding="UTF-8"?>
<Agent>
<Region>
<RegionName>beijing</RegionName>
<IDC>
<IDCName>CY</IDCName>
<Item>
<IP>192.168.121.0</IP>
<MASK>255.255.255.0</MASK>
</Item>
<Item>
<IP>192.168.122.0</IP>
<MASK>255.255.255.0</MASK>
</Item>
</IDC>
</Region>
<Region>
<RegionName>shanghai</RegionName>
<IDC>
<IDCName>HP</IDCName>
<Item>
<IP>192.168.63.0</IP>
<MASK>255.255.255.0</MASK>
</Item>
</IDC>
</Region>
</Agent>

Java代码：

public static Idc parserXml(String fileName, String ip) {
SAXBuilder builder = new SAXBuilder();
Idc resIdc = new Idc();

try {
Document document = builder.build(fileName);
Element sgagent = document.getRootElement();
List regionList = sgagent.getChildren("Region");
for (Object ele:regionList) {
Element region = (Element) ele;
List idcs = region.getChildren("IDC");
for (Object eleIdc:idcs) {
Element idc = (Element)eleIdc;
List items = idc.getChildren("Item");
for (Object eleItem:items) {
Element item = (Element)eleItem;
String idcIp = item.getChild("IP").getValue();
String idcMask = item.getChild("MASK").getValue();
int mask = IpUtil.convertMaskToInt(idcMask);
if (IpUtil.checkSameSegment(ip, idcIp, mask)) {
resIdc.region = region.getChild("RegionName").getValue();
resIdc.idc = idc.getChild("IDCName").getValue();
return resIdc;
}
}
}
System.out.println(region.getChild("RegionName").getName() + ":" + region.getChild("RegionName").getValue());
}
} catch (JDOMException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
resIdc.region = "unkown";
resIdc.idc = "unkown";
return resIdc;
}