xml解析例子3

xml文件

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <isOpen>true</isOpen>
    <refreshSpan>100000</refreshSpan>
    <tables>
        <table name="CACHE_TEST" key="ID" />
        <table name="CACHE_TEST1" key="ID1,ID2" />
        <table name="CACHE_TEST2" key="" />
    </tables>
    <test1>
        <table>
            <name value="vip">liweiVIP2</name>
            <age>24</age>
        </table>
        <table>
            <name value="normal">liwei2</name>
            <age>25</age>
        </table>
        <table>
            <name value="normal">liwei20</name>
            <age>25</age>
        </table>
    </test1>
    <test1 num = "second">
        <table>
            <name value="vip">liweiVIP3</name>
            <age>24</age>
        </table>
        <table>
            <name value="normal">liwe3</name>
            <age>25</age>
        </table>
        <table>
            <name value="normal">liwei30</name>
            <age>25</age>
        </table>
    </test1>
    <test3>
        <table>
            <name value="vip">liweiVIP3</name>
            <age>24</age>
        </table>
        <table>
            <name value="normal">liwe3</name>
            <age>25</age>
        </table>
        <table key = "noraml">
            <name value="normal">liwei30</name>
            <age>25</age>
        </table>
    </test3>
</root>

java代码

package jetsennet.cache;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.log4j.Logger;
import org.jdom.Attribute;
import org.jdom.Document;
import org.jdom.Element;
import org.jdom.input.SAXBuilder;

import jetsennet.sqlclient.DbConfig;

public class CacheConfig
{

    /**
     * 缓存是否开启
     */
    public static boolean isOpen;
    /**
     * 刷新间隔，单位为秒
     */
    public static int refreshSpan;
    /**
     * 需要缓存的表
     */
    public static List<String> tables = new ArrayList<String>();
    /**
     * 表为键，主键为值
     */
    public static Map<String, String> table2key = new HashMap<String, String>();
    /**
     * 日志
     */
    private static final Logger logger = Logger.getLogger(CacheConfig.class);

    private Document doc = null;

    static
    {
        InputStream input = null;
        try
        {
            input = DbConfig.class.getResourceAsStream("/cache.xml");
            SAXBuilder sax = new SAXBuilder();
            Document doc = sax.build(input);
            Element root = doc.getRootElement();
            Element isOpenEle = root.getChild("isOpen");
            Element refreshSpanEle = root.getChild("refreshSpan");
            Element tablesEle = root.getChild("tables");
            if (isOpenEle != null)
            {
                String isOpenS = isOpenEle.getTextTrim();
                isOpen = "true".equalsIgnoreCase(isOpenS);
                if (isOpen)
                {
                    if (tablesEle != null)
                    {
                        List<Element> tableEleLst = tablesEle.getChildren("table");
                        if (tableEleLst != null && tableEleLst.size() > 0)
                        {
                            int tableEleCount = tableEleLst.size();
                            for (int i = 0; i < tableEleCount; i++)
                            {
                                String name = null;
                                String key = null;
                                Element tableEle = tableEleLst.get(i);
                                Attribute nameAttr = tableEle.getAttribute("name");
                                Attribute keyAttr = tableEle.getAttribute("key");
                                if (nameAttr != null && keyAttr != null)
                                {
                                    name = nameAttr.getValue().trim();
                                    key = keyAttr.getValue().trim();
                                }
                                if (name != null && key != null)
                                {
                                    if (!table2key.containsKey(name))
                                    {
                                        table2key.put(name, key);
                                        tables.add(name);
                                    }
                                }
                            }
                        }
                    }
                }

                // test________________________________________________________________________________________________________
                List<Element> test1List = root.getChildren("test1");
                for (Element e1 : test1List)
                {
                    List<Element> tableList = e1.getChildren("table");
                    for (Element e2 : tableList)
                    {
                        String nameValue = e2.getChild("name").getAttributeValue("value");
                        if ("normal".equals(nameValue))
                        {
                            System.out.println(e2.getChild("name").getTextTrim());
                        }
                    }
                }

                if (refreshSpanEle != null)
                {
                    refreshSpan = Integer.valueOf(refreshSpanEle.getTextTrim());
                }
            }
            else
            {
                isOpen = false;
            }
        }
        catch (Exception e)
        {
            isOpen = false;
            logger.error("cache.xml文件出错，不开启缓存。", e);
        }
        finally
        {
            if (input != null)
            {
                try
                {
                    input.close();
                }
                catch (Exception ex)
                {
                    logger.error("", ex);
                }
                finally
                {
                    input = null;
                }
            }
        }
    }

    public static boolean containTable(String tableName)
    {
        return table2key.containsKey(tableName);
    }

    public static String getKey(String tableName)
    {
        return table2key.get(tableName);
    }

    public static void main(String[] args)
    {
        System.out.println(CacheConfig.isOpen);
        System.out.println(CacheConfig.tables);
    }

}