先给大家介绍下map和object互相转换的代码。
具体代码如所示:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/** * 使用org.apache.commons.beanutils进行转换 */ class A { if (map == null ) return null ; Object obj = beanClass.newInstance(); org.apache.commons.beanutils.BeanUtils.populate(obj, map); return obj; } public static Map<?, ?> objectToMap(Object obj) { if (obj == null ) return null ; return new org.apache.commons.beanutils.BeanMap(obj); } } /** * 使用Introspector进行转换 */ class B { public static Object mapToObject(Map<String, Object> map, Class<?> beanClass) throws Exception { if (map == null ) return null ; Object obj = beanClass.newInstance(); BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass()); PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors(); for (PropertyDescriptor property : propertyDescriptors) { Method setter = property.getWriteMethod(); if (setter != null ) { setter.invoke(obj, map.get(property.getName())); } } return obj; } public static Map<String, Object> objectToMap(Object obj) throws Exception { if (obj == null ) return null ; Map<String, Object> map = new HashMap<String, Object>(); BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass()); PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors(); for (PropertyDescriptor property : propertyDescriptors) { String key = property.getName(); if (key.compareToIgnoreCase( "class" ) == 0 ) { continue ; } Method getter = property.getReadMethod(); Object value = getter!= null ? getter.invoke(obj) : null ; map.put(key, value); } return map; } } /** * 使用reflect进行转换 */ class C { public static Object mapToObject(Map<String, Object> map, Class<?> beanClass) throws Exception { if (map == null ) return null ; Object obj = beanClass.newInstance(); Field[] fields = obj.getClass().getDeclaredFields(); for (Field field : fields) { int mod = field.getModifiers(); if (Modifier.isStatic(mod) || Modifier.isFinal(mod)){ continue ; } field.setAccessible( true ); field.set(obj, map.get(field.getName())); } return obj; } public static Map<String, Object> objectToMap(Object obj) throws Exception { if (obj == null ){ return null ; } Map<String, Object> map = new HashMap<String, Object>(); Field[] declaredFields = obj.getClass().getDeclaredFields(); for (Field field : declaredFields) { field.setAccessible( true ); map.put(field.getName(), field.get(obj)); } return map; } <p>} </p><p> </p><p>from:http: //www.open-open.com/code/view/1423280939826</p> |
下面给大家介绍Map和json的互相转换
第一段代码
1
2
3
4
5
6
|
Map<String,Object> map = new HashMap<String,Object>(); map.put( "method" , "json" ); map.put( "param" , null ); map.put( "time" , "2015-01-23 10:54:55" ); ObjectMapper mapper = new ObjectMapper(); mapper.writeValueAsString(map); |
第二段代码
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
|
ObjectMapper objectMapper = new ObjectMapper(); try { //将json字符串转成map结合解析出来,并打印(这里以解析成map为例) Map<String, Map<String, Object>> maps = objectMapper.readValue( json, Map. class ); System.out.println(maps.size()); Set<String> key = maps.keySet(); Iterator<String> iter = key.iterator(); while (iter.hasNext()) { String field = iter.next(); System.out.println(field + ":" + maps.get(field)); } } catch (JsonParseException e) { e.printStackTrace(); } catch (JsonMappingException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } readJson2Map(json); |
以上内容是小编给大家介绍的Java代码实现map和Object互转及Map和json的互转的相关知识,希望对大家有所帮助,如果大家想了解更多资讯敬请关注服务器之家网站,谢谢!