javaBean与Map<String,Object>互转

  1 package javaStudyDemo.bean.reflect.test;
  2 
  3 import java.beans.BeanInfo;
  4 import java.beans.Introspector;
  5 import java.beans.PropertyDescriptor;
  6 import java.lang.reflect.Method;
  7 import java.util.HashMap;
  8 import java.util.Map;
  9 import javaStudyDemo.others.PersonBean;
 10 
 11 import org.apache.commons.beanutils.BeanUtils;
 12 
 13 /**
 14  * 当把Person类作为BeanUtilTest的内部类时，程序出错<br>
 15  * java.lang.NoSuchMethodException: Property ‘**‘ has no setter method<br>
 16  * 本质：内部类 和 单独文件中的类的区别 <br>
 17  * BeanUtils.populate方法的限制：<br>
 18  * The class must be public, and provide a public constructor that accepts no arguments. <br>
 19  * This allows tools and applications to dynamically create new instances of your bean, <br>
 20  * without necessarily knowing what Java class name will be used ahead of time
 21  */
 22 public class BeanUtilTest {
 23 
 24     public static void main(String[] args) {
 25 
 26         PersonBean person = new PersonBean();
 27         Map<String, Object> mp = new HashMap<String, Object>();
 28         mp.put("name", "Mike");
 29         mp.put("age", 25);
 30         mp.put("mN", "male");
 31 
 32         // 将map转换为bean
 33         transMap2Bean2(mp, person);
 34 
 35         System.out.println("--- transMap2Bean Map Info: ");
 36         for (Map.Entry<String, Object> entry : mp.entrySet()) {
 37             System.out.println(entry.getKey() + ": " + entry.getValue());
 38         }
 39 
 40         System.out.println("--- Bean Info: ");
 41         System.out.println("name: " + person.getName());
 42         System.out.println("age: " + person.getAge());
 43         System.out.println("mN: " + person.getmN());
 44 
 45         // 将javaBean 转换为map
 46         Map<String, Object> map = transBean2Map(person);
 47 
 48         System.out.println("--- transBean2Map Map Info: ");
 49         for (Map.Entry<String, Object> entry : map.entrySet()) {
 50             System.out.println(entry.getKey() + ": " + entry.getValue());
 51         }
 52 
 53     }
 54 
 55     // Map --> Bean 2: 利用org.apache.commons.beanutils 工具类实现 Map --> Bean
 56     public static void transMap2Bean2(Map<String, Object> map, Object obj) {
 57         if (map == null || obj == null) {
 58             return;
 59         }
 60         try {
 61             BeanUtils.populate(obj, map);
 62         } catch (Exception e) {
 63             System.out.println("transMap2Bean2 Error " + e);
 64         }
 65     }
 66 
 67     // Map --> Bean 1: 利用Introspector,PropertyDescriptor实现 Map --> Bean
 68     public static void transMap2Bean(Map<String, Object> map, Object obj) {
 69 
 70         try {
 71             BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
 72             PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
 73 
 74             for (PropertyDescriptor property : propertyDescriptors) {
 75                 String key = property.getName();
 76 
 77                 if (map.containsKey(key)) {
 78                     Object value = map.get(key);
 79                     // 得到property对应的setter方法
 80                     Method setter = property.getWriteMethod();
 81                     setter.invoke(obj, value);
 82                 }
 83 
 84             }
 85 
 86         } catch (Exception e) {
 87             System.out.println("transMap2Bean Error " + e);
 88         }
 89 
 90         return;
 91 
 92     }
 93 
 94     // Bean --> Map 1: 利用Introspector和PropertyDescriptor 将Bean --> Map
 95     public static Map<String, Object> transBean2Map(Object obj) {
 96 
 97         if(obj == null){
 98             return null;
 99         }        
100         Map<String, Object> map = new HashMap<String, Object>();
101         try {
102             BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
103             PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
104             for (PropertyDescriptor property : propertyDescriptors) {
105                 String key = property.getName();
106 
107                 // 过滤class属性
108                 if (!key.equals("class")) {
109                     // 得到property对应的getter方法
110                     Method getter = property.getReadMethod();
111                     Object value = getter.invoke(obj);
112 
113                     map.put(key, value);
114                 }
115 
116             }
117         } catch (Exception e) {
118             System.out.println("transBean2Map Error " + e);
119         }
120 
121         return map;
122 
123     }
124 }

 1 public class PersonBean {
 2 
 3     private String  name;
 4     private Integer age;
 5     private String  mN;
 6 
 7     /**
 8      * @return the mN
 9      */
10     public String getmN() {
11         return mN;
12     }
13 
14     /**
15      * @param mN the mN to set
16      */
17     public void setmN(String mN) {
18         this.mN = mN;
19     }
20 
21 
22     /**
23      * @return the name
24      */
25     public String getName() {
26         return name;
27     }
28 
29     /**
30      * @param name the name to set
31      */
32     public void setName(String name) {
33         this.name = name;
34     }
35 
36     /**
37      * @return the age
38      */
39     public Integer getAge() {
40         return age;
41     }
42 
43     /**
44      * @param age the age to set
45      */
46     public void setAge(Integer age) {
47         this.age = age;
48     }
49 
50 }