xmlan.java

xml分析器,没使用dom,只用简单的java2类库

package untitled1;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.table.*;
import java.io.*;
import java.util.*;

class XMLAn extends JFrame
{
        JButton btn=new JButton("提取数据");
        JTextField DBText=new JTextField(10);
        JTextField tableText=new JTextField(10);
        DefaultTableModel dtm=new DefaultTableModel();
        JTable ta=new JTable();

        JPanel CenterP;

        String DB,tableName;

        Vector col=new Vector();
        //Vector row=new Vector();
        Vector body=new Vector();
        public XMLAn()
        {
                init();

                btn.addActionListener(new Act());

                this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                this.setSize(450,400);
                this.setVisible(true);

        }

        void init()
        {
                Container c=this.getContentPane();

                CenterP=new JPanel();
                JPanel p=new JPanel();
                p.add(DBText);
                p.add(tableText);

                CenterP.setLayout(new BorderLayout());
                CenterP.add(p,"North");
                CenterP.add(new JScrollPane(ta));

                c.add(btn,"North");
                c.add(CenterP,"Center");
        }

        class Act implements ActionListener
        {
                public void actionPerformed(ActionEvent e)
                {
                        dtm.addColumn("tile");
                        dtm.addColumn("art");
                        dtm.addColumn("price");
                        dtm.addColumn("year");
                        dtm.addColumn("month");

                        //渡出文件
                        String str=readFile("cd.xml");
                        //System.out.println (str);
                        String s=setDB(str);
                        //System.out.println (DB);
                        //System.out.println (s);
                        setTable(s);

                        DBText.setText(DB);
                        tableText.setText(tableName);
                        for(int i=0;i<col.size();i++)
                        {
                                System.out.println (col.get(i));
                        }


                        for(int i=0;i<body.size();i++)
                        {
                                Vector r=(Vector)body.get(i);
                                for(int j=0;j<r.size();j++)
                                {
                                        System.out.print (r.get(j)+"\t");

                                }
                                System.out.println ();
                        }



                        dtm.setDataVector(body,col);
                        ta.setModel(dtm);

                }


        }

        String  readFile(String fileName)
        {
                String result="";
                try
                {
                        BufferedReader br=new BufferedReader(new FileReader(fileName));
                        String str=null;

                        while((str=br.readLine())!=null)
                                result+=str;
                        br.close();

                }catch(Exception ex)
                {
                        ex.printStackTrace();
                }
                return result;

        }

        String setDB(String str)
        {
                int n=0;//查找的起始位置
                int n1=0;
                int n2=0;
                String s="";
                while(true)
                {
                        n1=str.indexOf("<",n);
                        n2=str.indexOf(">",n);

                        s=str.substring(n1+1,n2);

                        if(str.indexOf("/"+s,n2+1)!=-1)
                        {
                                DB=s;
                                break;
                        }
                        n=n2+1;
                }
                int m=str.lastIndexOf("</");
                return str.substring(n2+1,m);
        }

        void setTable(String s)
        {
                /*********取表名*************/
                int n1=s.indexOf("<");
                int n2=s.indexOf(">");
                String table=s.substring(n1+1,n2);
                if(s.indexOf("/"+table,n2+1)==-1)
                {
                        JOptionPane.showMessageDialog(this,"格式错误");
                        return;
                }
                else
                        tableName=table;
                /*****循环处理各行*******/
                int m=0;
                int m1=0;
                int m2=0;
                while(true)
                {
                        m1=s.indexOf("<"+tableName,m);
                        if(m1==-1)
                        {
                                break;
                        }
                        m2=s.indexOf("</"+tableName,m1+1);

                        String sData=s.substring(m1+2+tableName.length(),m2);
                        //row.clear();
                        Vector row=new Vector();
                        col.clear();
                        rowDeal(sData,row);//调用行处理
                        /*for(int i=0;i<row.size();i++)
                        {
                                System.out.println (row.get(i));

                        }
          */
                      body.addElement(row);
                        //dtm.addRow(row);
                        m=m2+3+tableName.length();

                }



        }
        void rowDeal(String sData,Vector row)
        {

                int m=0;
                int m1=0;
                int m2=0;
                int m3=0;
                String colName,colValue;
                while(true)
                {
                        m1=sData.indexOf("<",m);
                        if(m1==-1)
                        {
                                break;
                        }

                        m2=sData.indexOf(">",m1+1);
                        colName=sData.substring(m1+1,m2);
                        m3=sData.indexOf("</"+colName,m2+1);
                        if(m3==-1)
                        {
                                JOptionPane.showMessageDialog(this,"格式错误");
                                return;
                        }
                        col.addElement(colName);
                        colValue=sData.substring(m2+1,m3);
                        row.addElement(colValue);
                        m=m3+3+colName.length();

                }
                //dtm.setDataVector(body,col);
                //ta.setModel(dtm);
        }

        public static void main(String[] args)
        {
                new XMLAn();
        }


}