1.创建XML样本：
<?xml version="1.0" encoding="UTF-8"?>
<data>
<datasource>
<servername>192.168.18.254</servername>
<serverport>1521</serverport>
<databasename>GIS</databasename>
<username>GP</username>
<password>GP</password>
</datasource>
</data>
2.XML配置文件解析器
package com;
/*
* XML配置文件解析器,主要目的，是为做前期工作
*/
import java.util.Properties;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class ConfigParser extends DefaultHandler {
// 定义一个properties用来存放属性
private Properties props;
private String currentName;
private StringBuffer currentValue = new StringBuffer();
public ConfigParser() {
this.props = new Properties();
}
public Properties getProps() {
return this.props;
}
// 这里是将xml中元素值加入currentValue
public void characters(char[] ch, int start, int length)
throws SAXException {
currentValue.append(ch, start, length);
}
// 在遇到</xx>时，将之间的字符存放在props中间
public void endElement(String uri, String localName, String name)
throws SAXException {
props.put(currentName.toLowerCase(), currentValue.toString().trim());
}
// 定义开始解析元素的方法，这里将<xx>中的名称xx提出来，
public void startElement(String uri, String localName, String qName,
Attributes attributes) throws SAXException {
currentValue.delete(0, currentValue.length());
currentName = qName;
}
//
}
3.XML配置文件计取处理
package com;
/*
* XML配置文件计取处理
*/
import java.util.Properties;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
public class ParseXML {
// 定义一个Proerties用来存放属性值
private Properties props;
public Properties getProps() {
return this.props;
}
public void parse(String filename) throws Exception {
// 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 = factory.newSAXParser();
try {
// 将解析器和解析对象xml联系起来，开始解析
parser.parse(filename, handler);
// 获取解析成功后的属性
props = handler.getProps();
} finally {
factory = null;
parser = null;
handler = null;
}
}
}
4.读取XML配置文件
package com;
/*
* 读取XML配置文件
*/
import java.util.Properties;
public class ReadConfigXml {
private Properties props;
public ReadConfigXml(String url) {
ParseXML myRead = new ParseXML();
try {
myRead.parse(url);
props = new Properties();
props = myRead.getProps();
} catch (Exception e) {
e.printStackTrace();
}
}
public String getServerName() {
return props.getProperty("servername");
}
public String getServerPort() {
return props.getProperty("serverport");
}
public String getDatabaseName() {
return props.getProperty("databasename");
}
public String getUserName() {
return props.getProperty("username");
}
public String getPassword() {
return props.getProperty("password");
}
}
5.数据库连接加测试数据库连接加测试数据库连接加测试
package com;
/*
*
* 数据库连接加测试数据库连接加测试数据库连接加测试
*/
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class DBConnection {
private Connection con;
private DBConnection() {
}
public static DBConnection newInstance() {
return new DBConnection();
}
public Connection getConnection() {
// jdbc:oracle:thin:@192.168.18.254:1521:GP
// jdbc:oracle:thin:@192.168.18.254:7001/GP
ReadConfigXml r = new ReadConfigXml("src/mysql.xml");
String url = "jdbc:oracle:thin:@" + r.getServerName() + ":"
+ r.getServerPort() + ":" + r.getDatabaseName();
String username = r.getUserName();
String password = r.getPassword();
// System.out.println(url);
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
con = DriverManager.getConnection(url, username, password);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return con;
}
// 测试连接
public static void main(String args[]) {
DBConnection dbc = new DBConnection();
System.out.println("****" + dbc.getConnection());
Connection con = DBConnection.newInstance().getConnection();
System.out.println("测试成功！" + con);
try {
System.out.println("=====" + con);
Statement state = con.createStatement();
String sql = "select count(*) from sys_user";
ResultSet rs = state.executeQuery(sql);
if (rs.next()) {
System.out.println(rs.getInt(1));
}
rs.close();
state.close();
con.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
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