Java從數據庫中讀取數據到xml文件

操做xml須要的jar包：crimson.jar

 

package myXmlep1;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.apache.crimson.tree.XmlDocument;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.ParserConfigurationException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.xml.sax.SAXException;

public class test
{
static Connection conn=null;
static String sql;
//static String url="jdbc:oracle:oci8:@hydb";
static String url="jdbc:mysql://localhost:3306/test";
public static void main(String[] args)
{
try
{   //連接數據庫，取得數據
   //Class.forName("oracle.jdbc.driver.OracleDriver");//oracle數據庫
Class.forName("com.mysql.jdbc.Driver");//mysql數據庫

conn=DriverManager.getConnection(url,"root","");
   Statement st=conn.createStatement();
   ResultSet rs=st.executeQuery("select * from users");
   
   DocumentBuilderFactory factory=DocumentBuilderFactory.newInstance();
   DocumentBuilder builder=factory.newDocumentBuilder();
   Document doc=builder.newDocument();
   
   Element comp=doc.createElement_x("COMP");
   
   while(rs.next())
   {
    Element person=doc.createElement_x("PERSON");
    
    Element deptno=doc.createElement_x("DEPTNO");
    deptno.appendChild(doc.createTextNode(String.valueOf(rs.getInt(1))));
    person.appendChild(deptno);
    
    Element dname=doc.createElement_x("DNAME");
    dname.appendChild(doc.createTextNode(new test().xmlReplace(rs.getString(2))));
    person.appendChild(dname);
    
    Element loc=doc.createElement_x("LOC");
    loc.appendChild(doc.createTextNode(new test().xmlReplace(rs.getString(3))));
    person.appendChild(loc);
    comp.appendChild(person);
   }
   rs.close();
   st.close();
   conn.close();
   
   doc.appendChild(comp);
   
   ((XmlDocument)doc).write(new FileOutputStream("src/dept.xml"));
   
   System.out.println("操做成功！！！");
}catch(ClassNotFoundException e)
{
   e.printStackTrace();
}catch(SQLException e1)
{
   e1.printStackTrace();
}catch(ParserConfigurationException e2)
{
   e2.printStackTrace();
}catch(FileNotFoundException e3)
{
   e3.printStackTrace();
}catch(IOException e4)
{
   e4.printStackTrace();
}
}
public String xmlReplace(String value){
   System.out.println("value---old"+value);
   //value=value.replace("&", "&");
//   value=value.replace("<", "<");
//   value=value.replace(">", ">");
//   value=value.replace("'", "'");
   value=value.replace( "<","<");
   value=value.replace( ">",">");
   value=value.replace( "'","'");
// value.replace("""", """);
   System.out.println("value---new"+value);
    return value;
}

}