Jdom读取数据库并生成xml文件示例_编程语言综合--HTML5中文学习网

　　1.WriteXml.java:

代码如下

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:

代码如下

复制代码

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);
}
}