java 读取xml
1.DB.java
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; 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.fhadmin.org 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.fhadmin.orgpublic 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()); } }
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