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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);

}

}

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