table.java

简单的书店管理系统,是课设期间教师指导完成的,希望会对大家有帮助!

package book;
//********************************************************************
//table类继承JTable 实现数据的刷新，自定义控件。
//********************************************************************
import java.awt.Component;
import java.sql.SQLException;
import java.util.ArrayList;

import javax.swing.DefaultCellEditor;
import javax.swing.JCheckBox;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTable;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;

public class Table extends JTable{
	 public Table(NowEditableModel dtm) {
			super(dtm);
			this.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);//设置宽度不够时自动滚动条
		}


	public Table() {
		super();
	}

   //该方法用于调整单元格宽度
	public void setWidth() {
		int i,j,t,r,w;
		for(i=0;i<this.getColumnCount();i++){
			w=80;
			for(j=0;j<this.getRowCount();j++){
				TableCellRenderer renderer = this.getCellRenderer(j,i);
				 Component comp = renderer.getTableCellRendererComponent(this,this.getValueAt(j,i),false,false,j,i);
				 if(comp.getPreferredSize().width>w){
					 if(w<comp.getPreferredSize().width){
							w=comp.getPreferredSize().width;	
						}
				 }
			}
			System.out.println(w);
			this.getColumnModel().getColumn(i).setPreferredWidth(w);
		}
	}

   //检测选种行是否有数据 
	public ArrayList getSelectRow(int i,int j){
    	ArrayList List=new ArrayList(); 
    	if(this.getRowCount()==0){
    		JOptionPane.showMessageDialog(this, "没有任何记录");
    	}
    	else{
    		for(int x=0;x<j;x++){
       		 List.add(this.getValueAt(i,x));
       	    }
    	}
		return List; 
     }
	//刷新Table表
	public void Renovate(String sql) throws SQLException{
	    MainDAO mao=new MainDAO();
	    NowEditableModel model=(NowEditableModel)mao.getTableModel(sql);
	    this.setModel(model);
		this.updateUI();
		this.getSelectionModel().setSelectionInterval(0,0);//选中第一行
		this.setWidth();
		for (int t = 0; t < this.getColumnCount(); t++) {
			  if(this.getColumnName(t).equals("密码")){
				  setPassword();
			  }
		}
	}
	

	//密码设置 已密码的方式显示
	public void setPassword(){
	    JPasswordField passwordEdit = new JPasswordField();
        passwordEdit.setBorder(null);
		this.getColumn("密码").setCellEditor(new DefaultCellEditor(passwordEdit));
		this.getColumn("密码").setCellRenderer(new DefaultTableCellRenderer() {
            //重写 setValue 方法
            public void setValue(Object value) {
                String password = "";
                int wordLong = value.toString().length();
                
                for(int i = 0; i < wordLong; i++)
                    password += "●";
                super.setValue(password);
            }
        });
	}	
}