Jdom讀取數據庫並生成xml文件示例

 　　1.WriteXml.java:

 代碼如下  

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查詢數據庫把數據寫入xml文件中
 * @author admin
 * 
 */
public class WriteXml {
 
 public static void WriterFileToXml(){
  //創建一個xml文件
  File file = new File("D://user.xml");
  //創建數據庫連接
  Connection conn = DatabaseConnection.getConn();
  
  String sql = "select * from user";
  
  try {
   Statement st = conn.createStatement();//創建預處理對象
   ResultSet rs = st.executeQuery(sql);//獲得結果集
   Element root = new Element("users");//創建根元素
   while (rs.next()) {
    Element user = new Element("user");//創建子元素
    root.addContent(user);//添加子元素到根節點
    Element id = new Element("ID");//創建葉子節點
    id.setText(rs.getString("ID"));//給葉子節點賦值
    user.addContent(id);//添加葉子節點到父節點
    Element ename = new Element("USERNAME");
    ename.setText(rs.getString("USERNAME"));//給葉子節點賦值
    user.addContent(ename);  
    Element password = new Element("PASSWORD");//創建葉子節點
    password.setText(rs.getString("PASSWORD"));//給葉子節點賦值
    user.addContent(password);//添加葉子節點到父節點
    Element status = new Element("STATUS");
    status.setText(rs.getString("STATUS"));//給葉子節點賦值
    user.addContent(status);  
    Element descn = new Element("DESCN");
    descn.setText(rs.getString("DESCN"));//給葉子節點賦值
    user.addContent(descn);  
   }
   Document doc = new Document();//創建文本對象
   doc.addContent(root);//添加樹倒文本中
   Format format= Format.getCompactFormat();
   format.setIndent(" ");
   XMLOutputter out = new XMLOutputter(format);//創建輸出流
   FileWriter fw = new FileWriter(file);//寫數據
   out.output(doc, fw);//輸出到xml文件中
   fw.close();//關閉寫入流
  } catch (SQLException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
 }
 
 public static void main(String[] args) {
  //把數據庫的數據寫入xml文件中
  WriteXml.WriterFileToXml();
 }
}

　　2.連接數據庫java類：DatabaseConnection.java:

 代碼如下 復制代碼

package cn.gov.csrc.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
/**
 * 連接數據庫
 * 
 * @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);
 }
}