JSONUtil工具類

 1 package com.xxx.common.util;
 2 
 3 import java.util.List;
 4 import com.fasterxml.jackson.core.JsonProcessingException;
 5 import com.fasterxml.jackson.databind.JavaType;
 6 import com.fasterxml.jackson.databind.ObjectMapper;
 7 
 8 public class JSONUtil {
 9 
10     // 定義jackson對象
11     private static final ObjectMapper mapper = new ObjectMapper();
12     /**
13      * 將對象轉換成json字符串
14      * @param data
15      * @return
16      */
17     public static String toJSONString(Object data) {
18         try {
19             String string = mapper.writeValueAsString(data);
20             return string;
21         } catch (JsonProcessingException e) {
22             e.printStackTrace();
23         }
24         return null;
25     }
26 
27     /**
28      * 將json結果集轉化爲對象
29      * @param jsonData
30      * @param beanType
31      * @return
32      */
33     public static <T> T parseObject(String jsonData, Class<T> beanType) {
34         try {
35             T t = mapper.readValue(jsonData, beanType);
36             return t;
37         } catch (Exception e) {
38             e.printStackTrace();
39         }
40         return null;
41     }
42 
43     /**
44      * 將json數據轉換成list
45      * @param jsonData
46      * @param beanType
47      * @return
48      */
49     public static <T> List<T> parseArray(String jsonData, Class<T> beanType) {
50         JavaType javaType = mapper.getTypeFactory().constructParametricType(List.class, beanType);
51         try {
52             List<T> list = mapper.readValue(jsonData, javaType);
53             return list;
54         } catch (Exception e) {
55             e.printStackTrace();
56         }
57         return null;
58     }
59 }