把一个对象转换成Map,应用BeanWrapperImpl

把一个对象转换成Map,使用BeanWrapperImpl

import org.springframework.beans.BeanWrapperImpl;

public class User {

 private String name;
 private Date birthday;
 private String[] addrs;

 public static void main(String[] args) {
  //测试把一个对象转换成Map
  User user=new User();
  user.setName("张伟");
  user.setBirthday(new Date());
  user.setAddrs(new String[]{"北京","郑州","沈阳","合肥"});
  
  Map userMap=user.toMap();
  /*
  Set set=userMap.entrySet();
  Iterator it=set.iterator();
  while(it.hasNext()){
   System.out.print(it.next());
  }*/
  Set keys=userMap.keySet();
  String key=null;
  for(Object k:keys){
   key=(String)k;
   System.out.println(" key:"+key+"  value:"+userMap.get(key));
  }
 }

 public String getName() {
  return name;
 }

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

 public Date getBirthday() {
  return birthday;
 }

 public void setBirthday(Date birthday) {
  this.birthday = birthday;
 }

 public String[] getAddrs() {
  return addrs;
 }

 public void setAddrs(String[] addrs) {
  this.addrs = addrs;
 }

 public Map toMap() {
  BeanWrapperImpl beanWrapper = new BeanWrapperImpl(this);
  PropertyDescriptor[] alldescriptors = beanWrapper
    .getPropertyDescriptors();

  int length = alldescriptors.length;
  List list = new ArrayList();

  for (int i = 0; i < alldescriptors.length; i++) {
   if (alldescriptors[i].getReadMethod() != null
     && alldescriptors[i].getWriteMethod() != null) {
    list.add(alldescriptors[i]);
    System.out.println(alldescriptors[i].getDisplayName());
   }
  }
  PropertyDescriptor[] descriptors = (PropertyDescriptor[]) list
    .toArray(new PropertyDescriptor[0]);

  System.out.println(descriptors.length + " list.length=" + list.size());

  // toMap
  Map properties = new HashMap(descriptors.length);
  for (int i = 0; i < descriptors.length; i++) {
   String name = descriptors[i].getName();
   properties.put(name, beanWrapper.getPropertyValue(name));
  }
  
  Set keys = properties.keySet();
  String key = null;
  for (Object k : keys) {
   key = (String) k;
   System.out.println("key: " + key + " value:" + properties.get(key));
  }
  return properties;
 }

}