1、引入apache jar 包，如下：
commons-beanutils-1.7.0.jar
commons-logging.jar
2、
User u1 = new User(); u1.setAge(10); u1.setPassword("22222"); u1.setUserName("王黄"); u1.setD(1.0f); ToUser u2 = new ToUser(); try { BeanUtils.copyProperties(u2, u1); //PropertyUtils.copyProperties(u2, u1); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); }BeanUtils和PropertyUtils进行对象复制时，都是将后边的对象的属性值复制给前面的对象。
BeanUtils和PropertyUtils复制对象时，根据属性名进行复制。
如果属性名相同，但类型不同，BeanUtils会直接转换。而PropertyUtils会直接抛出异常。
3、代码：
（1）
package com.test; public class User { private String userName; private String password; private Integer age; private Float d; public Float getD() { return d; } public void setD(Float d) { this.d = d; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } } （2） package com.test; public class ToUser { private String userName; private String password; private Integer age; private String d; public String getD() { return d; } public void setD(String d) { this.d = d; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } }
（3）
package com.test; import java.lang.reflect.InvocationTargetException; import org.apache.commons.beanutils.BeanUtils; import org.apache.commons.beanutils.PropertyUtils; public class CopyClass { public static void main(String[] args) { User u1 = new User(); u1.setAge(10); u1.setPassword("22222"); u1.setUserName("王黄"); u1.setD(1.0f); ToUser u2 = new ToUser(); try { BeanUtils.copyProperties(u2, u1); //PropertyUtils.copyProperties(u2, u1); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } System.out.println(u1.getD().getClass()); System.out.println(u2.getD().getClass()); } }
