dom 解析XML

<?xml version="1.0" encoding="UTF-8"?>
 <memcaches version="1">
     <memcache type="AAAA">
         <ip>11.11.1.244:11211</ip>
        <prefix>aaaa_</prefix>
    </memcache>
     <memcache type="BBBB">
         <ip>11.22.1.243:11211</ip>
        <prefix>bbbb_</prefix>
    </memcache>
     <memcache type="CCCC">
         <ip>11.33.33.152:11211</ip>
        <prefix>cccc_</prefix>
    </memcache>
     <memcache type="DDDD">
         <ip>11.44.15.244:11211</ip>
        <prefix>dddd_</prefix>
    </memcache>
     <memcache type="EEEEEEE">
         <ip>11.66.16.152:11211</ip>
        <prefix>eeeee_</prefix>
    </memcache>
     <memcache type="FFFFF">
         <ip>11.77.170.152:11211</ip>
        <prefix>fffff_</prefix>
    </memcache>
</memcaches>

<?xml version="1.0" encoding="UTF-8"?>
<memcaches version="1">
	<memcache type="AAAA">
		<ip>11.11.1.244:11211</ip>
		<prefix>aaaa_</prefix>
	</memcache>
	<memcache type="BBBB">
		<ip>11.22.1.243:11211</ip>
		<prefix>bbbb_</prefix>
	</memcache>
	<memcache type="CCCC">
		<ip>11.33.33.152:11211</ip>
		<prefix>cccc_</prefix>
	</memcache>
	<memcache type="DDDD">
		<ip>11.44.15.244:11211</ip>
		<prefix>dddd_</prefix>
	</memcache>
	<memcache type="EEEEEEE">
		<ip>11.66.16.152:11211</ip>
		<prefix>eeeee_</prefix>
	</memcache>
	<memcache type="FFFFF">
		<ip>11.77.170.152:11211</ip>
		<prefix>fffff_</prefix>
	</memcache>
</memcaches>

解析上面xml文件的java代码：

 import javax.xml.parsers.DocumentBuilder;
 import javax.xml.parsers.DocumentBuilderFactory;
 import java.io.*; //Java基础包，包含各种IO操作
 import java.util.*; //Java基础包，包含各种标准数据结构操作
 import javax.xml.parsers.*; //XML解析器接口
 import org.w3c.dom.*;

 import com.happyelements.apollo.config.type.AppType;
 import com.happyelements.apollo.util.ApolloCollectionsUtil;

 public class ParseMemXML {

     public static final Map<String, MemBean> memMap = ApolloCollectionsUtil.newMap();//将MemBean放到map中存放

 //解析xml文件并将得到的实例放入map中
     public static void initXMLFile(String filename) throws Exception {
         // 为解析xml做准备
         // 创建DocumentBuilderFactory实例,指定DocumentBuilder
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
         DocumentBuilder db = null;
         try {
            db = dbf.newDocumentBuilder();
         } catch (ParserConfigurationException pce) {
            System.out.println(pce);
             // 出异常时输出异常信息，然后退出，下同
             System.exit(1);
        }
         Document doc = null;
         try {
            doc = db.parse(filename);
         } catch (DOMException dom) {
            System.err.println(dom.getMessage());
             System.exit(1);
         } catch (IOException ioe) {
            System.err.println(ioe);
             System.exit(1);
        }

         // 下面是解析XML的全过程，
         // 比较简单，先取根元素"memcaches"
        Element root = doc.getDocumentElement();
         // 取"memcache"元素列表
         NodeList memcaches = root.getElementsByTagName("memcache");
         for (int i = 0; i < memcaches.getLength(); i++) {
             // 创建一个memcache的Bean实例
                       MemBean memBean = new MemBean();
             // 依次取每个"memcache"元素
            Element memcache = (Element) memcaches.item(i);
             // 取memcache的type属性
             memBean.setType(memcache.getAttribute("type"));
             // 取"ip"元素，下面类同
             NodeList ips = memcache.getElementsByTagName("ip");
             if (ips.getLength() == 1) {
                 Element e = (Element) ips.item(0);
                Text t = (Text) e.getFirstChild();
                memBean.setIp(t.getNodeValue());
                System.out.println(memBean.getIp());
            }
             NodeList prefixs = memcache.getElementsByTagName("prefix");
             if (prefixs.getLength() == 1) {
                 Element e = (Element) prefixs.item(0);
                Text t = (Text) e.getFirstChild();
                memBean.setPrefix(t.getNodeValue());
                System.out.println(memBean.getPrefix());
            }
            memMap.put(memBean.getType().toString(), memBean);
        }
    }

     public static void main(String[] args) throws Exception {
         ParseMemXML.initXMLFile("E:\\workplace\\Tool2\\WebRoot\\WEB-INF\\memconf.xml");
        System.out.println(ParseMemXML.memMap.size());
        MemBean memBean = ParseMemXML.memMap.get(AppType.AAAA.toString());
         System.out.println("ip=====" + memBean.getIp());
         System.out.println("prefix===" + memBean.getPrefix());

    }
}

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.*; //Java基础包，包含各种IO操作
import java.util.*; //Java基础包，包含各种标准数据结构操作
import javax.xml.parsers.*; //XML解析器接口
import org.w3c.dom.*;

import com.happyelements.apollo.config.type.AppType;
import com.happyelements.apollo.util.ApolloCollectionsUtil;

public class ParseMemXML {

	public static final Map<String, MemBean> memMap = ApolloCollectionsUtil.newMap();//将MemBean放到map中存放

//解析xml文件并将得到的实例放入map中
	public static void initXMLFile(String filename) throws Exception {
		// 为解析xml做准备
		// 创建DocumentBuilderFactory实例,指定DocumentBuilder
		DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
		DocumentBuilder db = null;
		try {
			db = dbf.newDocumentBuilder();
		} catch (ParserConfigurationException pce) {
			System.out.println(pce);
			// 出异常时输出异常信息，然后退出，下同
			System.exit(1);
		}
		Document doc = null;
		try {
			doc = db.parse(filename);
		} catch (DOMException dom) {
			System.err.println(dom.getMessage());
			System.exit(1);
		} catch (IOException ioe) {
			System.err.println(ioe);
			System.exit(1);
		}

		// 下面是解析XML的全过程，
		// 比较简单，先取根元素"memcaches"
		Element root = doc.getDocumentElement();
		// 取"memcache"元素列表
		NodeList memcaches = root.getElementsByTagName("memcache");
		for (int i = 0; i < memcaches.getLength(); i++) {
			// 创建一个memcache的Bean实例
                      MemBean memBean = new MemBean();
			// 依次取每个"memcache"元素
			Element memcache = (Element) memcaches.item(i);
			// 取memcache的type属性
			memBean.setType(memcache.getAttribute("type"));
			// 取"ip"元素，下面类同
			NodeList ips = memcache.getElementsByTagName("ip");
			if (ips.getLength() == 1) {
				Element e = (Element) ips.item(0);
				Text t = (Text) e.getFirstChild();
				memBean.setIp(t.getNodeValue());
				System.out.println(memBean.getIp());
			}
			NodeList prefixs = memcache.getElementsByTagName("prefix");
			if (prefixs.getLength() == 1) {
				Element e = (Element) prefixs.item(0);
				Text t = (Text) e.getFirstChild();
				memBean.setPrefix(t.getNodeValue());
				System.out.println(memBean.getPrefix());
			}
			memMap.put(memBean.getType().toString(), memBean);
		}
	}

	public static void main(String[] args) throws Exception {
		ParseMemXML.initXMLFile("E:\\workplace\\Tool2\\WebRoot\\WEB-INF\\memconf.xml");
		System.out.println(ParseMemXML.memMap.size());
		MemBean memBean = ParseMemXML.memMap.get(AppType.AAAA.toString());
		System.out.println("ip=====" + memBean.getIp());
		System.out.println("prefix===" + memBean.getPrefix());

	}
}

MemBean的java源文件

import java.io.Serializable;

 import org.simpleframework.xml.Attribute;
 import org.simpleframework.xml.Element;
 import org.simpleframework.xml.Root;

 @Root(name = "memconf")
 public class MemBean implements Serializable {

     private static final long serialVersionUID = 2209681159359089305L;

     @Attribute
     private String type;
     @Element
     private String ip;
     @Element
     private String prefix;

     public String getType() {
         return type;
    }

     public void setType(String type) {
         this.type = type;
    }

     public String getIp() {
         return ip;
    }

     public void setIp(String ip) {
         this.ip = ip;
    }

     public String getPrefix() {
         return prefix;
    }

     public void setPrefix(String prefix) {
         this.prefix = prefix;
    }

}

import java.io.Serializable;

import org.simpleframework.xml.Attribute;
import org.simpleframework.xml.Element;
import org.simpleframework.xml.Root;

@Root(name = "memconf")
public class MemBean implements Serializable {

	private static final long serialVersionUID = 2209681159359089305L;

	@Attribute
	private String type;
	@Element
	private String ip;
	@Element
	private String prefix;

	public String getType() {
		return type;
	}

	public void setType(String type) {
		this.type = type;
	}

	public String getIp() {
		return ip;
	}

	public void setIp(String ip) {
		this.ip = ip;
	}

	public String getPrefix() {
		return prefix;
	}

	public void setPrefix(String prefix) {
		this.prefix = prefix;
	}

}

AppType源文件

 public enum AppType {
AAAA，
BBBB，
CCCC，
DDDD，
EEEE，
FFFF，

;
}