分页封装2

分享一个封装好的分页实例

1 新建接口
import java.util.List;

public interface PageInterface {
/**
* 根据页数，每页显示行数返回jtable显示信息
* @param page
* @param rows
* @return
*/
public List getTableList(int page, int rows);
}
2 根据路径查找类
public class PageFactory {
/**
* 根据路径查找类
* @param className 路径
* @return
* @throws InstantiationException
* @throws IllegalAccessException
*/
public static PageInterface getClass(String className)
throws InstantiationException, IllegalAccessException {
PageInterface production = null;
try {
production = (PageInterface) Class.forName   (className).newInstance();
} catch (ClassNotFoundException ex) {
ex.printStackTrace();
}
return production;
}
}

3 根据路径，页数，每页显示行数得到jtable显示的信息
public class PageList {
public List showListOfTable(String a, int page, int rows)
throws InstantiationException, IllegalAccessException {
PageInterface cat = PageFactory.getClass(a);
List list = cat.getTableList(page, rows);
return list;
}
}
4 建立一个model
public class PageButtonTableModel extends DefaultTableModel {
/**
*
*/
private static final long serialVersionUID = 1L;

String header[];
List<Object[]> data = new ArrayList<Object[]>();

public PageButtonTableModel() {

}

public List<Object[]> getData() {
return data;
}

public void setData(List<Object[]> data) {

this.data = data;
}

public int getColumnCount() {
return header.length;
}

public String getColumnName(int c) {
return header[c];
}

public Object getValueAt(int row, int column) {
return data.get(row)[column];
}

public boolean isCellEditable(int r, int c) {
return false;
}

public int getRowCount() {
if (data != null) {
return data.size();
} else {
return 0;
}
}
}


5 建立共用模板
public class ButtonPanel extends JPanel {

private static final long serialVersionUID = 1L;
private JButton firstButton = null;
private JButton preButton = null;
private JButton nextButton = null;
private JButton lastButton = null;
private JLabel jLabel = null;

// ====================
private String page;
private List<Object[]> tableData;
private PageButtonTableModel model;
private int totalPage;
private int numberOfPage = 1;
private String className;
private PageList pList = new PageList(); // @jve:decl-index=0:
private int rows;
private JTable jTable;


/**
*
* @param totalPage 总页数
* @param className 类名
* @param rows 每页显示行数
* @param jTable
*/
public ButtonPanel(int totalPage, String className,
int rows, JTable jTable) {
super();
this.totalPage = totalPage;
this.className = className;
this.rows = rows;
this.jTable = jTable;
page = "共 " + totalPage + " 页 当前第 " + numberOfPage + " 页";
initialize();
}

/**
* This method initializes this
*
* @return void
*/
private void initialize() {
jLabel = new JLabel();
jLabel.setBounds(new Rectangle(270, 1, 129, 24));
jLabel.setText(page);
this.setSize(400, 26);
this.setLayout(null);
this.add(getFirstButton(), null);
this.add(getPreButton(), null);
this.add(getNextButton(), null);
this.add(getLastButton(), null);
this.add(jLabel, null);
}

/**
* This method initializes firstButton
*
* @return javax.swing.JButton
*/
private JButton getFirstButton() {
if (firstButton == null) {
firstButton = new JButton();
firstButton.setText("首页");
firstButton.setBounds(new Rectangle(0, 1, 60, 24));
firstButton.addActionListener(new java.awt.event.ActionListener() {
@SuppressWarnings("unchecked")
public void actionPerformed(java.awt.event.ActionEvent e) {
numberOfPage = 1;
try {
tableData = pList.showListOfTable(className,
numberOfPage, rows);
} catch (InstantiationException e1) {
e1.printStackTrace();
} catch (IllegalAccessException e1) {
e1.printStackTrace();
}
setDataOfTable(jTable);
}
});
}
return firstButton;
}

/**
* This method initializes preButton
*
* @return javax.swing.JButton
*/
private JButton getPreButton() {
if (preButton == null) {
preButton = new JButton();
preButton.setText("上一页");
preButton.setBounds(new Rectangle(60, 1, 75, 24));
preButton.addActionListener(new java.awt.event.ActionListener() {
@SuppressWarnings("unchecked")
public void actionPerformed(java.awt.event.ActionEvent e) {
if (numberOfPage <= totalPage && numberOfPage > 1) {
numberOfPage = numberOfPage - 1;
}
try {
tableData = pList.showListOfTable(className,
numberOfPage, rows);
} catch (InstantiationException e1) {
e1.printStackTrace();
} catch (IllegalAccessException e1) {
e1.printStackTrace();
}
setDataOfTable(jTable);
}
});
}
return preButton;
}

/**
* This method initializes nextButton
*
* @return javax.swing.JButton
*/
private JButton getNextButton() {
if (nextButton == null) {
nextButton = new JButton();
nextButton.setText("下一页");
nextButton.setBounds(new Rectangle(135, 1, 75, 24));
nextButton.addActionListener(new java.awt.event.ActionListener() {
@SuppressWarnings("unchecked")
public void actionPerformed(java.awt.event.ActionEvent e) {
if (numberOfPage < totalPage) {
numberOfPage = numberOfPage + 1;
}
try {
tableData = pList.showListOfTable(className,
numberOfPage, rows);
} catch (InstantiationException e1) {
e1.printStackTrace();
} catch (IllegalAccessException e1) {
e1.printStackTrace();
}
setDataOfTable(jTable);
}
});
}
return nextButton;
}

/**
* This method initializes lastButton
*
* @return javax.swing.JButton
*/
private JButton getLastButton() {
if (lastButton == null) {
lastButton = new JButton();
lastButton.setText("尾页");
lastButton.setBounds(new Rectangle(210, 1, 60, 24));
lastButton.addActionListener(new java.awt.event.ActionListener() {
@SuppressWarnings("unchecked")
public void actionPerformed(java.awt.event.ActionEvent e) {
numberOfPage = totalPage;
try {
tableData = pList.showListOfTable(className,
numberOfPage, rows);
} catch (InstantiationException e1) {
e1.printStackTrace();
} catch (IllegalAccessException e1) {
e1.printStackTrace();
}
setDataOfTable(jTable);
}
});
}
return lastButton;
}

public void setDataOfTable(JTable jTable) {
getModel().setData(tableData);
jTable.updateUI();
page = "共 " + totalPage + " 页 当前第 " + numberOfPage + " 页";
jLabel.setText(page);
if (numberOfPage == 1) {
firstButton.setEnabled(false);
preButton.setEnabled(false);
nextButton.setEnabled(true);
lastButton.setEnabled(true);
} else if (numberOfPage == totalPage) {
firstButton.setEnabled(true);
preButton.setEnabled(true);
nextButton.setEnabled(false);
lastButton.setEnabled(false);
} else {
firstButton.setEnabled(true);
preButton.setEnabled(true);
nextButton.setEnabled(true);
lastButton.setEnabled(true);
}

}

public PageButtonTableModel getModel() {
return model;
}

public void setModel(PageButtonTableModel model) {
this.model = model;
}




}

现在进入测试
1 建立table的model
public class PageModel2 extends PageButtonTableModel {

/**
*
*/
private static final long serialVersionUID = 1L;
String header[] = { "姓名", "地址", "年龄", "性别", "电话" };
List<Object[]> data = new ArrayList<Object[]>();

public PageModel2() {
super();

}

public List<Object[]> getData() {
return data;
}

public void setData(List<Object[]> data) {

this.data = data;
}

public int getColumnCount() {
return header.length;
}

public String getColumnName(int c) {
return header[c];
}

public Object getValueAt(int row, int column) {
return data.get(row)[column];
}

public boolean isCellEditable(int r, int c) {
return false;
}

public int getRowCount() {
if (data != null) {
return data.size();
} else {
return 0;
}
}
}

2 建立bean
public class PageTableBean {

String name;
String address;
int age;
String sex;
String photo;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getAddress() {
return address;
}

public void setAddress(String address) {
this.address = address;
}



public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}

public String getSex() {
return sex;
}

public void setSex(String sex) {
this.sex = sex;
}

public String getPhoto() {
return photo;
}

public void setPhoto(String photo) {
this.photo = photo;
}

}
3 建立测试页
public class PageFrame2 extends JFrame implements PageInterface{

private static final long serialVersionUID = 1L;
private JPanel jContentPane = null;
private JScrollPane jScrollPane = null;
private JTable jTable = null;

List listData;  //  @jve:decl-index=0:
String className = "aPage.PageFrame2"; // @jve:decl-index=0:
private PageModel2 model;
private List<Object[]> tableData; // @jve:decl-index=0:
private int totalPage = 20;

private JPanel jPanel = null;
int rows = 20;

/**
* This is the default constructor
*/
public PageFrame2() {
super();
tableData = this.getTableList(1, rows);
initialize();
}

/**
* This method initializes this
*
* @return void
*/
private void initialize() {
this.setSize(700, 600);
this.setContentPane(getJContentPane());
this.setTitle("JFrame");
}

/**
* This method initializes jContentPane
*
* @return javax.swing.JPanel
*/
private JPanel getJContentPane() {
if (jContentPane == null) {
jContentPane = new JPanel();
jContentPane.setLayout(null);
jContentPane.add(getJScrollPane(), null);
jContentPane.add(getJPanel(), null);
}
return jContentPane;
}

/**
* This method initializes jScrollPane
*
* @return javax.swing.JScrollPane
*/
private JScrollPane getJScrollPane() {
if (jScrollPane == null) {
jScrollPane = new JScrollPane();
jScrollPane.setBounds(new Rectangle(28, 13, 604, 224));
jScrollPane.setViewportView(getJTable());
jScrollPane
.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
jScrollPane
.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
}
return jScrollPane;
}

/**
* This method initializes jTable
*
* @return javax.swing.JTable
*/
private JTable getJTable() {
if (jTable == null) {
model = new PageModel2();
jTable = new JTable();
model.setData(tableData);
jTable.setModel(model);
}
return jTable;
}

public List getTableList(int page, int rows) {
List list = getList(page, rows);
listData = new ArrayList();
if (list.size() > 0 && list != null) {
for (Object bean : list) {
if (bean instanceof PageTableBean) {
PageTableBean pageBean = (PageTableBean) bean;
String name = "";
if (pageBean.getName() != null) {
name = pageBean.getName();
}
String address = "";
if (pageBean.getAddress() != null) {
address = pageBean.getAddress();
}
int age = 0;
if (pageBean.getAge() != 0) {
age = pageBean.getAge();
}
String sex = "";
if (pageBean.getSex() != null) {
sex = pageBean.getSex();
}
String photo = "";
if (pageBean.getPhoto() != null) {
photo = pageBean.getPhoto();
}

Object[] ob = new Object[5];
ob[0] = name;
ob[1] = address;
ob[2] = age;
ob[3] = sex;
ob[4] = photo;
listData.add(ob);
}
}
}
return listData;
}

public static List<PageTableBean> getList(int page, int rows) {
List<PageTableBean> list = new ArrayList<PageTableBean>();
for (int i = page; i < rows + page; i++) {
PageTableBean bean = new PageTableBean();
bean.setName("name" + i);
bean.setAddress("address" + i);
bean.setAge(i);
if (i % 2 == 0) {
bean.setSex("男");
} else {
bean.setSex("女");
}
bean.setPhoto("photo" + i);
list.add(bean);
}
return list;
}

/**
* This method initializes jPanel
*
* @return javax.swing.JPanel
*/
private JPanel getJPanel() {
if (jPanel == null) {
jPanel = new JPanel();
jPanel.setLayout(null);
jPanel.setBounds(new Rectangle(27, 237, 605, 30));
ButtonPanel bp = new ButtonPanel(totalPage, className, rows,
jTable);
bp.setBounds(new Rectangle(100, 0, 400, 30));
bp.setModel(model);
jPanel.add(bp);
}
return jPanel;
}
}
运行ok

后台ejb的写法如下：
public class AppatatusPageTest implements ApparatusPageTestRemote {
@PersistenceContext
private EntityManager entityManager;

@Override
public List<Apparatus> queryApparatus(int whichPage, int pagesize) {
// TODO Auto-generated method stub
try {
String sql = "select a from Apparatus a";
Query query = entityManager.createQuery(sql);
// 从结果集中的那个索引开始获取
if(whichPage>=1){
query.setFirstResult((whichPage - 1) * pagesize);
}

// 设置获取多少条记录
query.setMaxResults(pagesize);
List<Apparatus> list = query.getResultList();
//分离内存中受EntityManager管理的实体bean，让VM进行垃圾回收
entityManager.clear();
return list;
} catch (Exception e) {
e.printStackTrace();
return null;
}

}

       public Integer querySumApparatus() {

String sql = "select count(*) from Apparatus a";

Query query = entityManager.createQuery(sql);
int totalPageSize = Integer.valueOf(query.getResultList().get(0)
.toString());
return totalPageSize;
}
}

好复杂啊！！！

LZ,你的分页也写得太复杂了点吧。。

有点复杂了撒。

太复杂了。