Common BeanUtils组件的使用

╰半橙微兮° 2022-01-10 23:39 395阅读 0赞

例子二:

动态创建属性

文件名：BeanUtilsExample2，源码：

![ExpandedBlockStart.gif][]  
![None.gif][] package com.sy;  
![None.gif][]  
![None.gif][] import java.util.GregorianCalendar;  
![None.gif][] import org.apache.commons.beanutils.LazyDynaBean;  
![None.gif][] import org.apache.commons.beanutils.BeanUtils;  
![None.gif][]  
![ExpandedBlockStart.gif][] public class BeanUtilsExample2 \{   
![InBlock.gif][]  //动态创建属性  
![ExpandedSubBlockStart.gif][]  public static void main(String args\[\]) throws Exception \{   
![InBlock.gif][]  
![InBlock.gif][]  LazyDynaBean hh = new LazyDynaBean();  
![InBlock.gif][]  hh.set("country", "中国");  
![InBlock.gif][]  hh.set("city", "北京");  
![InBlock.gif][]  hh.set("postCode", "100120");  
![InBlock.gif][]  hh.set("addr", "aaaaaaa");  
![InBlock.gif][]  
![InBlock.gif][]  LazyDynaBean bb = new LazyDynaBean();  
![InBlock.gif][]  bb.set("phone", "home", "11011011");  
![InBlock.gif][]  bb.set("phone", "office", "111111");  
![InBlock.gif][]  bb.set("email", "sh@126.com");  
![InBlock.gif][]  bb.set("address", 0, hh);  
![InBlock.gif][]  bb.set("birthDate", new GregorianCalendar(1990, 3, 29).getTime());  
![InBlock.gif][]  
![InBlock.gif][]  LazyDynaBean tt = new LazyDynaBean();  
![InBlock.gif][]  tt.set("userId", new Long(8888888));  
![InBlock.gif][]  tt.set("gggg", "施杨");  
![InBlock.gif][]  tt.set("password", "sgsgsgsg");  
![InBlock.gif][]  tt.set("dddd", bb);  
![InBlock.gif][]  
![InBlock.gif][]  System.out.println(BeanUtils.getProperty(tt, "gggg"));  
![InBlock.gif][]  System.out.println(BeanUtils.getProperty(tt, "dddd.birthDate"));  
![InBlock.gif][]  System.out.println(BeanUtils.getProperty(tt,  
![InBlock.gif][]  "dddd.address\[0\].addr"));  
![InBlock.gif][]  System.out  
![InBlock.gif][]  .println(BeanUtils.getProperty(tt, "dddd.phone(office)"));  
![ExpandedSubBlockEnd.gif][]  \}  
![ExpandedBlockEnd.gif][] \}  
![None.gif][]

例子三:

连接Mysql数据库

文件名BeanUtilsExample3.java源码：

![ExpandedBlockStart.gif][]  
![None.gif][] package com.sy;  
![None.gif][]  
![None.gif][] import java.sql.Connection;  
![None.gif][] import java.sql.DriverManager;  
![None.gif][] import java.sql.PreparedStatement;  
![None.gif][] import java.sql.ResultSet;  
![None.gif][] import java.sql.SQLException;  
![None.gif][] import java.util.Iterator;  
![None.gif][] import org.apache.commons.beanutils.DynaBean;  
![None.gif][] import org.apache.commons.beanutils.ResultSetDynaClass;  
![None.gif][]  
![ExpandedBlockStart.gif][] public class BeanUtilsExample3 \{   
![ExpandedSubBlockStart.gif][]  public static void main(String args\[\]) throws Exception \{   
![InBlock.gif][]  Connection conn = getConnection();  
![InBlock.gif][]  PreparedStatement ps = conn  
![InBlock.gif][]  .prepareStatement("select id,title,time from guestbook2 order by id desc");  
![InBlock.gif][]  ResultSet rs = ps.executeQuery();  
![InBlock.gif][]  
![InBlock.gif][]  ResultSetDynaClass rsdc = new ResultSetDynaClass(rs);//重点，二次封装，对连接对象有依赖  
![InBlock.gif][]  Iterator itr = rsdc.iterator();  
![ExpandedSubBlockStart.gif][]  while (itr.hasNext()) \{   
![InBlock.gif][]  DynaBean bean = (DynaBean) itr.next();  
![InBlock.gif][]  System.out.print(bean.get("id") + "\\t");  
![InBlock.gif][]  System.out.print(bean.get("title") + "\\t");  
![InBlock.gif][]  System.out.println(bean.get("time"));  
![ExpandedSubBlockEnd.gif][]  \}  
![InBlock.gif][]  conn.close();  
![ExpandedSubBlockEnd.gif][]  \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]  private static Connection getConnection() \{   
![InBlock.gif][]  String url = "jdbc:mysql://localhost:3306/guestbook";  
![InBlock.gif][]  String username = "root";  
![InBlock.gif][]  String password = "hicc";  
![InBlock.gif][]  Connection conn = null;  
![ExpandedSubBlockStart.gif][]  try \{   
![InBlock.gif][]  Class.forName("com.mysql.jdbc.Driver");  
![InBlock.gif][]  conn = DriverManager.getConnection(url, username, password);  
![ExpandedSubBlockStart.gif][]  \} catch (ClassNotFoundException e) \{   
![InBlock.gif][]  e.printStackTrace();  
![ExpandedSubBlockStart.gif][]  \} catch (SQLException e) \{   
![InBlock.gif][]  e.printStackTrace();  
![ExpandedSubBlockEnd.gif][]  \}  
![InBlock.gif][]  return conn;  
![ExpandedSubBlockEnd.gif][]  \}  
![ExpandedBlockEnd.gif][] \}

例子四:

文件BeanUtilsExample4.java，源码：

![ExpandedBlockStart.gif][]  
![None.gif][] package com.sy;  
![None.gif][]  
![None.gif][] import java.sql.Connection;  
![None.gif][] import java.sql.DriverManager;  
![None.gif][] import java.sql.PreparedStatement;  
![None.gif][] import java.sql.ResultSet;  
![None.gif][] import java.sql.SQLException;  
![None.gif][] import java.util.Iterator;  
![None.gif][] import org.apache.commons.beanutils.DynaBean;  
![None.gif][] import org.apache.commons.beanutils.RowSetDynaClass;  
![None.gif][]  
![ExpandedBlockStart.gif][] public class BeanUtilsExample4 \{   
![ExpandedSubBlockStart.gif][]  public static void main(String args\[\]) throws Exception \{   
![InBlock.gif][]  Connection conn = getConnection();  
![InBlock.gif][]  PreparedStatement ps = conn  
![InBlock.gif][]  .prepareStatement("select id,title,time from guestbook2 order by id desc");  
![InBlock.gif][]  ResultSet rs = ps.executeQuery();  
![InBlock.gif][]  
![InBlock.gif][]  RowSetDynaClass rsdc = new RowSetDynaClass(rs);  
![InBlock.gif][]  //重点，与ResultSetDynaClass的区别  
![InBlock.gif][]  conn.close();//重点，关闭连接后仍能读取  
![InBlock.gif][]  Iterator itr = rsdc.getRows().iterator();  
![ExpandedSubBlockStart.gif][]  while (itr.hasNext()) \{   
![InBlock.gif][]  DynaBean bean = (DynaBean) itr.next();  
![InBlock.gif][]  System.out.print(bean.get("id") + "\\t");  
![InBlock.gif][]  System.out.print(bean.get("title") + "\\t");  
![InBlock.gif][]  System.out.println(bean.get("time"));  
![ExpandedSubBlockEnd.gif][]  \}  
![ExpandedSubBlockEnd.gif][]  \}  
![InBlock.gif][]  
![ExpandedSubBlockStart.gif][]  private static Connection getConnection() \{   
![InBlock.gif][]  String url = "jdbc:mysql://localhost:3306/guestbook";  
![InBlock.gif][]  String username = "root";  
![InBlock.gif][]  String password = "hicc";  
![InBlock.gif][]  Connection conn = null;  
![ExpandedSubBlockStart.gif][]  try \{   
![InBlock.gif][]  Class.forName("com.mysql.jdbc.Driver");  
![InBlock.gif][]  conn = DriverManager.getConnection(url, username, password);  
![ExpandedSubBlockStart.gif][]  \} catch (ClassNotFoundException e) \{   
![InBlock.gif][]  e.printStackTrace();  
![ExpandedSubBlockStart.gif][]  \} catch (SQLException e) \{   
![InBlock.gif][]  e.printStackTrace();  
![ExpandedSubBlockEnd.gif][]  \}  
![InBlock.gif][]  return conn;  
![ExpandedSubBlockEnd.gif][]  \}  
![ExpandedBlockEnd.gif][] \}

这就是Common BeanUtils组件的主要应用!!!

转载于:https://blog.51cto.com/tetop/1187054

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