java中Bean类和Map的相互转换

  1 package com.studey.mapTbean;
  2
  3 import java.beans.BeanInfo;
  4 import java.beans.IntrospectionException;
  5 import java.beans.Introspector;
  6 import java.beans.PropertyDescriptor;
  7 import java.lang.reflect.InvocationTargetException;
  8 import java.lang.reflect.Method;
  9 import java.util.HashMap;
 10 import java.util.Map;
 11
 12 public class BeanUtil {
 13
 14     public static void main(String[] args) throws Exception {
 15
 16         Map<String, Object> mp = new HashMap<String, Object>();
 17         mp.put("name", "Tom Cat");
 18         mp.put("addr", 178);
 19         mp.put("tel", "123456");
 20
 21         PersonBean person = map2Bean(mp, PersonBean.class);
 22         System.out.println("transMap2Bean Map Info:");
 23         for (Map.Entry<String, Object> entry : mp.entrySet()) {
 24             System.out.println(entry.getKey() + ": " + entry.getValue());
 25         }
 26         System.out.println("Bean Info:");
 27         System.out.println("name: " + person.getName());
 28         System.out.println("addr: " + person.getaddr());
 29         System.out.println("mN: " + person.gettel());
 30
 31         bean2Map(person, mp);
 32         System.out.println("transBean2Map Map Info:");
 33         for (Map.Entry<String, Object> entry : mp.entrySet()) {
 34             System.out.println(entry.getKey() + ": " + entry.getValue());
 35         }
 36     }
 37
 38     // mapToBean方法：
 39
 40     public static <T, K, V> T map2Bean(Map<K, V> mp, Class<T> beanCls)
 41             throws Exception, IllegalArgumentException, InvocationTargetException {
 42         T t = null;
 43         try {
 44
 45             BeanInfo beanInfo = Introspector.getBeanInfo(beanCls);
 46             PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
 47
 48             t = beanCls.newInstance();
 49
 50             for (PropertyDescriptor property : propertyDescriptors) {
 51                 String key = property.getName();
 52
 53                 if (mp.containsKey(key)) {
 54                     Object value = mp.get(key);
 55                     Method setter = property.getWriteMethod(); 56        57                     setter.invoke(t, value);
 58                 }
 59             }
 60
 61         } catch (IntrospectionException e) {
 62
 63             e.printStackTrace();
 64         }
 65         return t;
 66     }
 67
 68     // beanToMap方法：
 69
 70     public static <T, K, V> Map<String, Object> bean2Map(T bean, Map<String, Object> mp)
 71             throws Exception, IllegalAccessException {
 72
 73         if (bean == null) {
 74             return null;
 75         }
 76
 77         try {
 78             BeanInfo beanInfo = Introspector.getBeanInfo(bean.getClass());
 79             PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
 80
 81             for (PropertyDescriptor property : propertyDescriptors) {
 82                 String key = property.getName();
 83
 84                 if (!key.equals("class")) {
 85
 86                     Method getter = property.getReadMethod(); 87                                                                  88                     Object value;
 89
 90                     value = getter.invoke(bean);
 91                     mp.put(key, value);
 92                 }
 93
 94             }
 95
 96         } catch (IntrospectionException e) {
 97
 98             e.printStackTrace();
 99         } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
100            101             e.printStackTrace();
102
103         }
104         return mp;
105
106     }
107 }

 1 package com.studey.mapTbean;
 2
 3 public class PersonBean {
 4     private String name;
 5     private Integer addr;
 6     private String tel;
 7
 8     public String getName() {
 9         return name;
10     }
11
12     public void setName(String name) {
13         this.name = name;
14     }
15
16     public Integer getaddr() {
17         return addr;
18     }
19
20     public void setaddr(Integer addr) {
21         this.addr = addr;
22     }
23
24     public String gettel() {
25         return tel;
26     }
27
28     public void settel(String tel) {
29         this.tel = tel;
30     }
31
32 } 

运行结果：

 1 transMap2Bean Map Info:
 2 name: Tom Cat
 3 tel: 123456
 4 addr: 178
 5 Bean Info:
 6 name: Tom Cat
 7 addr: 178
 8 mN: 123456
 9 transBean2Map Map Info:
10 name: Tom Cat
11 tel: 123456
12 addr: 178