jackson使用

<!-- jackson start -->

    <dependency>

  <groupId>com.fasterxml.jackson.core</groupId>

  <artifactId>jackson-core</artifactId>

  <version>2.6.3</version>

    </dependency>

   

    <dependency>

  <groupId>com.fasterxml.jackson.core</groupId>

  <artifactId>jackson-databind</artifactId>

  <version>2.6.3</version>

    </dependency>

    <dependency>

  <groupId>com.fasterxml.jackson.core</groupId>

  <artifactId>jackson-annotations</artifactId>

  <version>2.6.3</version>

    </dependency>

    <!-- jackson end -->

 

 

1. import java.io.IOException;  
2. import java.text.SimpleDateFormat;  
3. import java.util.TimeZone;  
4.   
5. import org.apache.log4j.Logger;  
6.   
7. import com.fasterxml.jackson.annotation.JsonInclude.Include;  
8. import com.fasterxml.jackson.core.JsonGenerationException;  
9. import com.fasterxml.jackson.core.JsonParseException;  
10. import com.fasterxml.jackson.core.type.TypeReference;  
11. import com.fasterxml.jackson.databind.DeserializationFeature;  
12. import com.fasterxml.jackson.databind.JsonMappingException;  
13. import com.fasterxml.jackson.databind.ObjectMapper;  
14. import com.fasterxml.jackson.databind.SerializationFeature;  
15.   
16. public class JsonUtils {  
17.     private static Logger logger = Logger.getLogger(JsonUtils.class);  
18.     private static final ObjectMapper objectMapper;  
19.     static {  
20.         objectMapper = new ObjectMapper();  
21.         //去掉默认的时间戳格式  
22.         objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);  
23.         //设置为中国上海时区  
24.         objectMapper.setTimeZone(TimeZone.getTimeZone("GMT+8"));  
25.         objectMapper.configure(SerializationFeature.WRITE_NULL_MAP_VALUES, false);  
26.         //空值不序列化  
27.         objectMapper.setSerializationInclusion(Include.NON_NULL);  
28.         //反序列化时，属性不存在的兼容处理  
29.         objectMapper.getDeserializationConfig().withoutFeatures(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);  
30.         //序列化时，日期的统一格式  
31.         objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));  
32.   
33.         objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);  
34.         objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);  
35.         //单引号处理  
36.         objectMapper.configure(com.fasterxml.jackson.core.JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);  
37.     }  
38.   
39.     public static <T> T toObject(String json, Class<T> clazz) {  
40.         try {  
41.             return objectMapper.readValue(json, clazz);  
42.         } catch (JsonParseException e) {  
43.             logger.error(e.getMessage(), e);  
44.         } catch (JsonMappingException e) {  
45.             logger.error(e.getMessage(), e);  
46.         } catch (IOException e) {  
47.             logger.error(e.getMessage(), e);  
48.         }  
49.         return null;  
50.     }  
51.   
52.     public static <T> String toJson(T entity) {  
53.         try {  
54.             return objectMapper.writeValueAsString(entity);  
55.         } catch (JsonGenerationException e) {  
56.             logger.error(e.getMessage(), e);  
57.         } catch (JsonMappingException e) {  
58.             logger.error(e.getMessage(), e);  
59.         } catch (IOException e) {  
60.             logger.error(e.getMessage(), e);  
61.         }  
62.         return null;  
63.     }  
64.   
65.     public static <T> T toCollection(String json, TypeReference<T> typeReference) {  
66.         try {  
67.             return objectMapper.readValue(json, typeReference);  
68.         } catch (JsonParseException e) {  
69.             logger.error(e.getMessage(), e);  
70.         } catch (JsonMappingException e) {  
71.             logger.error(e.getMessage(), e);  
72.         } catch (IOException e) {  
73.             logger.error(e.getMessage(), e);  
74.         }  
75.         return null;  
76.     }  
77.   
78. }