java 读取 xml 里的内容

￡神魔★判官ぃ 2022-12-20 03:10 147阅读 0赞

1，readXML

package com.bn.util;
     import java.sql.Connection;
     import java.sql.DriverManager;
     import java.sql.PreparedStatement;
     import java.sql.ResultSet;
     import java.sql.SQLException;
     import java.sql.Statement;
     import java.util.Iterator;
     import java.util.Properties;
     import org.dom4j.Document;
     import org.dom4j.DocumentException;
     import org.dom4j.Element;
     import org.dom4j.io.SAXReader;
     public class DB {
     private static String dbServer;
     private static String dbName;
     private static String dbUser;
     private static String dbPwd;
    
    //java项目www.fhadmin.org
    public void readXML(){
         
         SAXReader sr = new SAXReader();//获取读取xml的对象。
        Document doc = null;
         String path1 = String.valueOf(Thread.currentThread().getContextClassLoader().getResource(""));
         //System.out.println(path1);
         path1 = path1 + "../DB.xml";
         //System.out.println(path1);
       try {
        doc = sr.read(path1);
       } catch (DocumentException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
       }//得到xml所在位置。然后开始读取。并将数据放入doc中
        Element el_root = doc.getRootElement();//向外取数据，获取xml的根节点。
        Iterator it = el_root.elementIterator();//从根节点下依次遍历，获取根节点下所有子节点
        
         while(it.hasNext()){//遍历该子节点
         
          Object o = it.next();//再获取该子节点下的子节点
         Element el_row = (Element)o;
          String s = el_row.getText();
          Iterator it_row = el_row.elementIterator();
          int i =1;
          while(it_row.hasNext()){//遍历节点
          Element el_ename = (Element)it_row.next();//获取该节点下的所有数据。
       
           if(i == 1){
            this.setDbServer(el_ename.getText());
            //System.out.println(this.getDbServer());
            //dbServer = el_ename.getText();
           }
           if(i == 2){
            this.setDbName(el_ename.getText());
             // System.out.println(this.getDbName());
            //dbName = el_ename.getText();
           }
           if(i == 3){
            this.setDbUser(el_ename.getText());
             // System.out.println(this.getDbUser());
            //dbUser = el_ename.getText();
           }
           if(i == 4){
            this.setDbPwd(el_ename.getText());
             // System.out.println(this.getDbPwd());
            //dbPwd = el_ename.getText();
           }
          // System.out.println(i);
           i++;
           //System.out.println(el_ename.getText());
          }
          //System.out.println(o);
         }
         
        }
     static {
       DB dbxml = new DB();
       dbxml.readXML();
       
       try {
        Class.forName("com.mysql.jdbc.Driver");
       } catch (ClassNotFoundException e) {
        e.printStackTrace();
       }
     }
    
     public static Connection createConn(){
       DB dbxml = new DB();
       //String name = dbxml.dbName;
       //System.out.println(name);
       //System.out.println(dbxml.getDbServer() + dbxml.getDbName() + dbxml.getDbUser() + dbxml.getDbPwd());
       Connection conn = null;
       try {
        conn = DriverManager.getConnection("jdbc:mysql://"+ dbxml.getDbServer() +":3306/"+ dbxml.getDbName() +"?user="+ dbxml.getDbUser() +"&password="+ dbxml.getDbPwd());
        //conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/bnss?user=root&password=root");
       } catch (SQLException e) {
        e.printStackTrace();
       }
       return conn;
     }
    
     public static PreparedStatement createPstmt(Connection conn, String sql){
       PreparedStatement pstmt = null;
       try {
        pstmt = conn.prepareStatement(sql);
       } catch (SQLException e) {
        e.printStackTrace();
       }
       return pstmt;
     }
    
     public static void close(Connection conn){
       if(conn == null)return;
       try {
        conn.close();
        conn = null;
       } catch (SQLException e) {
        e.printStackTrace();
       }
     }
    
     public static void close(Statement stmt){
       try {
        stmt.close();
        stmt = null;
       } catch (SQLException e) {
        e.printStackTrace();
       }
     }
    
     public static void close(ResultSet rs){
       try {
        rs.close();
        rs = null;
       } catch (SQLException e) {
        e.printStackTrace();
       }
     }
     public String getDbName() {
       return dbName;
     }
     public void setDbName(String dbName) {
       this.dbName = dbName;
     }
     public String getDbServer() {
       return dbServer;
     }
     public String getDbUser() {
       return dbUser;
     }
     public String getDbPwd() {
       return dbPwd;
     }
     public void setDbServer(String dbServer) {
       this.dbServer = dbServer;
     }
     public void setDbUser(String dbUser) {
       this.dbUser = dbUser;
     }
     public void setDbPwd(String dbPwd) {
       this.dbPwd = dbPwd;
     }
     }

2.ParseXML.java

package com.bn.util;
     import java.util.Properties;
     import javax.xml.parsers.ParserConfigurationException;
     import javax.xml.parsers.SAXParser;
     import javax.xml.parsers.SAXParserFactory;
     import org.xml.sax.SAXException;
     import java.net.URL;
     
    //java项目www.1b23.com
    public class ParseXML{
         //定义一个Properties 用来存放 dbhost dbuser dbpassword的值
        private Properties props;
         //这里的props
         public Properties getProps() {
             return this.props;
         }
         public void parse(String filename) {
             //将我们的解析器对象化
            ConfigParser handler = new ConfigParser();
             //获取SAX工厂对象
            SAXParserFactory factory = SAXParserFactory.newInstance();
             factory.setNamespaceAware(false);
             factory.setValidating(false);
             //获取SAX解析
            SAXParser parser=null;
             try {
                 parser = factory.newSAXParser();
             } catch (Exception e1) {            
                 e1.printStackTrace();
             }        
             URL confURL = null;
             //得到配置文件myenv.xml所在目录. tomcat中是在WEB-INF/classes
             //下例中BeansConstants是用来存放xml文件中配置信息的类,可以自己代替或定义
            try{
                 confURL = ParseXML.class.getClassLoader().getResource(filename);
     //只需要将我们所需要的XML文件名字输入进去就可以了！
            }catch(Exception e){
                 System.out.print(e.toString());
             }
             try
             {    //将解析器和解析对象myenv.xml联系起来,开始解析
                parser.parse(confURL.toString(), handler);
                 //获取解析成功后的属性 以后 我们其他应用程序只要调用本程序的props就可以提取出属性名称和值了
                props = handler.getProps();
             }catch(Exception e){
                 System.out.println(e.toString());
             }finally{
                 factory=null;
                 parser=null;
                 handler=null;
             }
         }
     }

3.ConfigParser.java

package com.bn.util;
     import org.xml.sax.Attributes;
     import org.xml.sax.helpers.DefaultHandler;
     import org.xml.sax.SAXException;
     import java.util.Properties;
    
    //使用DefaultHandler的好处 是 不必陈列出所有方法,
    //java项目www.1b23.com
    public class ConfigParser extends DefaultHandler {
         定义一个Properties 用来存放 dbhost dbuser dbpassword的值
        private Properties props;
         private String currentSet;
         private String currentName;
         private StringBuffer currentValue = new StringBuffer();
         //构建器初始化props
         public ConfigParser() {
             this.props = new Properties();
         }
         public Properties getProps() {
             return this.props;
         }
         //定义开始解析元素的方法. 这里是将<xxx>中的名称xxx提取出来.
         public void startElement(String uri, String localName, String qName, Attributes attributes)throws SAXException {
             currentValue.delete(0, currentValue.length());
             this.currentName =qName;
         }
         //这里是将<xxx></xxx>之间的值加入到currentValue
         public void characters(char[] ch, int start, int length) throws SAXException {
             currentValue.append(ch, start, length);
         }
         //在遇到</xxx>结束后,将之前的名称和值一一对应保存在props中
        public void endElement(String uri, String localName, String qName) throws SAXException {
             props.put(qName.toLowerCase(), currentValue.toString().trim());
         }
     }