beanutils的使用

一、概述
第一次看到BeanUtils包，是在Struts项目中，作为Struts一个工具来使用的，
估计功能越弄越强，就移到Common项目中了吧。

BeanUtils一共有四个package:
org.apache.commons.beanutils
org.apache.commons.beanutils.converters
org.apache.commons.beanutils.locale
org.apache.commons.beanutils.locale.converters
后三个包主要是用于数据的转换，围绕着一个Converter接口，该接口只有一个方法：
java.lang.Object convert(java.lang.Class type, java.lang.Object value) ，
用于将一个value转换成另一个类型为type的Object。在一些自动化的应用中应该会有用。
这里不作评论，以后有兴趣了，或者觉得有用了，再行研究。
这里只讲第一个包。

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注：上面这段话为转载。

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二、BeanUtils基于实例的研究：

（１）、构造两个Bean

package objectdemo;

/**
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2005</p>
* <p>Company: </p>
* @author not attributable
* @version 1.0
*/

public class Street {
  public Street() {
  }
  private String sid;
  private String sname;
  public String getSid() {
    return sid;
  }
  public String getSname() {
    return sname;
  }
  public void setSid(String sid) {
    this.sid = sid;
  }
  public void setSname(String sname) {
    this.sname = sname;
  }
}

--------------------------------------------------------------------------------------------------

package objectdemo;

import java.util.Map;

public class ObjectDTO {
  public ObjectDTO() {
  }
  private Integer id;
  private String name;
  private String password;
  private String[] Fail;
  private Map desc;
  private Street street;


  public Integer getId() {
    return id;
  }
  public String getName() {
    return name;
  }
  public String getPassword() {
    return password;
  }
  public void setId(Integer id) {
    this.id = id;
  }
  public void setName(String name) {
    this.name = name;
  }
  public void setPassword(String password) {
    this.password = password;
  }
  public Map getDesc() {
    return desc;
  }
  public void setDesc(Map desc) {
    this.desc = desc;
  }
  public String[] getFail() {
    return Fail;
  }
  public void setFail(String[] Fail) {
    this.Fail = Fail;
  }
  public Street getStreet() {
    return street;
  }
  public void setStreet(Street street) {
    this.street = street;
  }
}
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（２）、测试：

package objectdemo;

import java.util.Map;
import java.util.HashMap;
import org.apache.commons.beanutils.BeanUtils;
import java.lang.reflect.InvocationTargetException;
import java.util.*;

/**
* <p>Title: </p>
* <p>Description: </p>
* <p>Copyright: Copyright (c) 2005</p>
* <p>Company: </p>
* @author not attributable
* @version 1.0
*/

public class TestObject {

  public TestObject() {

  }
  public static void main(String[] args) throws InstantiationException,
      NoSuchMethodException, IllegalAccessException, InvocationTargetException {
    TestObject testObject1 = new TestObject();
    ObjectDTO dto=new ObjectDTO();
    Map map=new HashMap();
    map.put("id",new Integer(2));
    map.put("name","value1");
    map.put("fail",new String[]{"a","b","c"});
    map.put("password","value2");
     Map hh=new HashMap();
     hh.put("00","0aa");
     hh.put("01","0ab");
    map.put("desc",hh);
     Street st=new Street();
     st.setSid("sx0001");
     st.setSname("xiaroom");
    map.put("street",st);

    testObject1.doCopy(dto,map);
    System.out.println(dto.getId());
    System.out.println(dto.getName());
    System.out.println(dto.getPassword());
    String[] f=dto.getFail();
    for (int i=0;i<f.length;i++) {
      System.out.println(f[i]);
    }
  }

  public void doCopy(Object object,Map map) throws InvocationTargetException,
      IllegalAccessException, NoSuchMethodException, InvocationTargetException,
      IllegalAccessException, NoSuchMethodException, InvocationTargetException,
      InstantiationException, IllegalAccessException {
//      BeanUtils.populate(object,map);               //(1)populate
//      BeanUtils.copyProperties(object,map);         //(2)copyProperties
        BeanUtils.copyProperties(object,map);         //(3)copyProperties
        String id=BeanUtils.getProperty(object,"id"); //(4)getProperty
        System.out.println("id="+id);
        String name=BeanUtils.getProperty(object,"name");
        System.out.println("name="+name);
        String password=BeanUtils.getProperty(object,"password");
        System.out.println("password="+password);

        String[] fail=BeanUtils.getArrayProperty(object,"fail");//(5)getArrayProperty
        System.out.println("fail[0]="+fail[0]);
        System.out.println("fail's length="+fail.length);

        Map hashMap=BeanUtils.describe(object);//(6)describe
        System.out.println("hashMap's size="+hashMap.size());

        String a=BeanUtils.getIndexedProperty(object,"fail",0);//(7)getIndexedProperty
        System.out.println("fail[0]="+a);

        String aa=BeanUtils.getIndexedProperty(object,"fail[1]");
        System.out.println("fail[1]="+aa);


        String ps=BeanUtils.getSimpleProperty(object,"password");//(8)getSimpleProperty
        System.out.println("password="+ps);

        BeanUtils.setProperty(object,"password","value22");//(9)setProperty

        String pss=BeanUtils.getSimpleProperty(object,"password");
        System.out.println("password="+pss);

        ObjectDTO dto=(ObjectDTO) BeanUtils.cloneBean(object);//(10)cloneBean
        System.out.println(dto.getClass().getName());
        System.out.println("dto'id="+dto.getId());
        System.out.println("dto'name="+dto.getName());
        System.out.println("dto'password="+dto.getPassword());

        String value00=BeanUtils.getMappedProperty(object,"desc","00");//(11)getMappedProperty
        System.out.println("value00="+value00);

        String sid=BeanUtils.getNestedProperty(object,"street.sid");//(12)getNestedProperty
        System.out.println("street.sid="+sid);
        String sname=BeanUtils.getNestedProperty(object,"street.sname");
        System.out.println("street.sname="+sname);

  }
}

（３）、输出如下：

。。。。。。

id=2

name=value1

password=value2

fail[0]=a

fail's length=3

hashMap's size=7

fail[0]=a

fail[1]=b

password=value2

password=value22

objectdemo.ObjectDTO

dto'id=2

dto'name=value1

dto'password=value22

value00=0aa

street.sid=sx0001

street.sname=xiaroom

2

value1

value22

a

b

c