利用 Jaxp (Sax) 解析xml文件--- 解析指定节点的值

package tao.test;

 

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

 

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.parsers.SAXParser;

import javax.xml.parsers.SAXParserFactory;

 

import org.xml.sax.Attributes;

import org.xml.sax.SAXException;

import org.xml.sax.helpers.DefaultHandler;

 

public class SqlServer {

    private String username;

    private String password;

    private String url;

    private String driver;

    /**

     *  存储结果

     */

    Map map = new HashMap();

 

    /**

     * @throws IOException

     * @throws SAXException

     * @throws ParserConfigurationException

     */

    public SqlServer() throws SAXException, IOException, ParserConfigurationException {

 

       String userDir = System.getProperty("user.dir");

       String eosConfig = new File(userDir).getParent()

              + "/eosserver/config/eosconfig.xml";

 

       SAXParserFactory spf = SAXParserFactory.newInstance();

       SAXParser sp = spf.newSAXParser();

       // MyHander 是一个内部类

       sp.parse(new File(eosConfig), new MyHandler());

 

       this.username = map.get("username").toString().trim();

       this.password = map.get("password").toString().trim();

       this.url = map.get("jdbcurl").toString().trim();

       this.driver = map.get("jdbcdriver").toString().trim();

    }

 

    public String getUsername() {

       return username;

    }

 

    public void setUsername(String username) {

       this.username = username;

    }

 

    public String getPassword() {

       return password;

    }

 

    public void setPassword(String password) {

       this.password = password;

    }

    public String getUrl() {

       return url;

    }

    public void setUrl(String url) {

       this.url = url;

    }

    public String getDriver() {

       return driver;

    }

    public void setDriver(String driver) {

       this.driver = driver;

    }

    /**

     * 

     */

    class MyHandler extends DefaultHandler {

 

       List keys = new ArrayList() {

           {

              add("username");

              add("password");

              add("jdbcurl");

              add("jdbcdriver");

           }

       };

 

       String key = null;

       private int index = 0;

       private int flag = index;

 

       public void characters(char ch[], int start, int length)

              throws SAXException {

           String value = new String(ch, start, length);

           if (flag == index - 1) {

              map.put(key, value);

              flag = index;

           }

       }

 

       public void startElement(String uri, String localName, String qName,

              Attributes attr) throws SAXException {

           if ("configValue".equals(qName)) {

              if (keys.contains(attr.getValue("key"))) {

                  key = attr.getValue("key");

                  index++;

              }

           }

       }

 

    }

 

    public static void main(String[] args) throws SAXException, IOException, ParserConfigurationException {

       new SqlServer();

 

    }

}