使用Jdom查询数据库后，把数据写入xml文件中

1.WriteXml.java:

package cn.gov.csrc.xml;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Arrays;
import java.util.List;

import org.jdom2.Document;
import org.jdom2.Element;
import org.jdom2.output.Format;
import org.jdom2.output.XMLOutputter;
import cn.gov.csrc.jdbc.DatabaseConnection;
/**
 * @function 使用Jdom查询数据库把数据写入xml文件中
 * @author admin
 * 
 */
public class WriteXml {
	
	public static void WriterFileToXml(){
		//创建一个xml文件
		File file = new File("D://user.xml");
		//创建数据库连接
		Connection conn = DatabaseConnection.getConn();
		
		String sql = "select * from user";
		
		try {
			Statement st = conn.createStatement();//创建预处理对象
			ResultSet rs = st.executeQuery(sql);//获得结果集
			Element root = new Element("users");//创建根元素
			while (rs.next()) {
				Element user = new Element("user");//创建子元素
				root.addContent(user);//添加子元素到根节点
				Element id = new Element("ID");//创建叶子节点
				id.setText(rs.getString("ID"));//给叶子节点赋值
				user.addContent(id);//添加叶子节点到父节点
				Element ename = new Element("USERNAME");
				ename.setText(rs.getString("USERNAME"));//给叶子节点赋值
				user.addContent(ename);		
				Element password = new Element("PASSWORD");//创建叶子节点
				password.setText(rs.getString("PASSWORD"));//给叶子节点赋值
				user.addContent(password);//添加叶子节点到父节点
				Element status = new Element("STATUS");
				status.setText(rs.getString("STATUS"));//给叶子节点赋值
				user.addContent(status);		
				Element descn = new Element("DESCN");
				descn.setText(rs.getString("DESCN"));//给叶子节点赋值
				user.addContent(descn);		
			}
			Document doc = new Document();//创建文本对象
			doc.addContent(root);//添加树倒文本中
			Format format= Format.getCompactFormat();
			format.setIndent(" ");
			XMLOutputter out = new XMLOutputter(format);//创建输出流
			FileWriter fw = new FileWriter(file);//写数据
			out.output(doc, fw);//输出到xml文件中
			fw.close();//关闭写入流
		} catch (SQLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public static void main(String[] args) {
		//把数据库的数据写入xml文件中
		WriteXml.WriterFileToXml();
	}
}

2.连接数据库java类：DatabaseConnection.java:

package cn.gov.csrc.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
/**
 * 连接数据库
 * 
 * @author admin
 * 
 */
public class DatabaseConnection {

	private static final String driverName = "com.mysql.jdbc.Driver";
	private static final String url = "jdbc:mysql://localhost/springdb?autoReconnect=true&useUnicode=true&characterEncoding=UTF8";
	private static final String username = "root";
	private static final String password = "root";

	static {
		try {
			Class.forName(driverName);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
	}

	public static Connection getConn() {
		Connection conn = null;
		try {
			conn = DriverManager.getConnection(url, username, password);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return conn;
	}

	public static void main(String[] args) {
		Connection conn = getConn();
		System.out.println(conn);
	}
}