1 import java.lang.reflect.InvocationTargetException;
2 import java.util.Date;
3 import java.util.HashMap;
4 import java.util.Map;
5
6 import org.apache.commons.beanutils.BeanUtils;
7 import org.apache.commons.beanutils.ConvertUtils;
8 import org.apache.commons.beanutils.converters.BooleanConverter;
9 import org.apache.commons.beanutils.converters.DateConverter;
10 import org.apache.commons.beanutils.converters.DoubleConverter;
11 import org.apache.commons.beanutils.converters.IntegerConverter;
12 import org.apache.commons.beanutils.converters.LongConverter;
13
14 import com.iwhalecloud.retail.common.consts.CommonBaseMessageCodeEnum;
15 import com.iwhalecloud.retail.common.exception.BaseException;
16 import com.rabbitmq.tools.json.JSONReader;
17 import com.rabbitmq.tools.json.JSONWriter;
18
19 public abstract class JsonUtil {
20
21 private static JSONWriter jsonWriter = new JSONWriter();
22 private static JSONReader jsonReader = new JSONReader();
23
24 public static String object2Json(Object object) {
25 return jsonWriter.write(object);
26 }
27
28 /**
29 * json字符串转Object对象
30 * @param json
31 * @return
32 */
33 public static Object json2Object(String json) {
34 return jsonReader.read(json);
35 }
36
37 private JsonUtil() {
38
39 }
40
41 public static <T> T json2T(String json, Class<T> clazz) throws InvocationTargetException, IllegalAccessException, InstantiationException, BaseException {
42 AssertUtil.isNotEmpty(json, CommonBaseMessageCodeEnum.REQ_PARAM_NOT_NULL);
43 Map<String, Object> map = (HashMap<String, Object>) JsonUtil.json2Object(json);
44 T t = clazz.newInstance();
45 ConvertUtils.register(new DateConverter(), Date.class);
46 ConvertUtils.register(new LongConverter(null), Long.class);
47 ConvertUtils.register(new BooleanConverter(null), Boolean.class);
48 ConvertUtils.register(new IntegerConverter(null), Integer.class);
49 ConvertUtils.register(new DoubleConverter(null), Double.class);
50 BeanUtils.populate(t, map);
51 return t;
52 }
53
54 }
使用方式：
Map<String, Object> map = (HashMap<String, Object>) JsonUtil.json2Object(jsonStr);
1 import java.util.HashMap;
2 import java.util.Iterator;
3 import java.util.List;
4 import java.util.Map;
5
6
7 import org.apache.commons.lang.StringUtils;
8 import org.zgr.pack.entity.test.TestJsonToList;
9
10 import com.alibaba.fastjson.JSON;
11 import com.alibaba.fastjson.JSONObject;
12
13
14 public class Util {
15 //json字符串转换为MAP
16 public static Map jsonStrToMap(String s) {
17 Map map = new HashMap();
18 //注意这里JSONObject引入的是net.sf.json
19 net.sf.json.JSONObject json = net.sf.json.JSONObject.fromObject(s);
20 Iterator keys = json.keys();
21 while (keys.hasNext()) {
22 String key = (String) keys.next();
23 String value = json.get(key).toString();
24 if (value.startsWith("{") && value.endsWith("}")) {
25 map.put(key, jsonStrToMap(value));
26 } else {
27 map.put(key, value);
28 }
29
30 }
31 return map;
32 }
33
34 // 将jsonArray字符串转换成List集合
35 public static List jsonToList(String json, Class beanClass) {
36 if (!StringUtils.isBlank(json)) {
37 //这里的JSONObject引入的是 com.alibaba.fastjson.JSONObject;
38 return JSONObject.parseArray(json, beanClass);
39 } else {
40 return null;
41 }
42 }
43
44 //List集合转换为json
45 public static JSON listToJson(List list) {
46 JSON json=(JSON) JSON.toJSON(list);
47 return json;
48 }
49
50
51 public static void main(String[] args) {
52
53 System.out.println("---------------------json字符串转换为MAP---------------------");
54 JSONObject jsonObject=new JSONObject();
55 jsonObject.put("abc", 123);
56 jsonObject.put("def", 456);
57 System.out.println("A==========json====="+jsonObject);
58 Map map=Util.jsonStrToMap(jsonObject.toString());
59 System.out.println("B==========def======"+map.get("def"));
60
61
62 System.out.println("---------------------将jsonArray字符串转换成List集合---------------------");
63 String str="[{\"year\":\"2015\",\"month\":10,\"count\":47},{\"year\":2017,\"month\":12,\"count\":4}]";
64 //这里需要指定泛型，我们建立一个实体类TestJsonToList
65 List<TestJsonToList> list=Util.jsonToList(str, TestJsonToList.class);
66 System.out.println("C==========取list第二个元素的year====="+list.get(1).getYear());
67
68
69 System.out.println("---------------------将list集合转换成json---------------------");
70 //这里的JSONObject引入的是 com.alibaba.fastjson.JSONObject;
71 JSON json=Util.listToJson(list);
72 System.out.println("D==========json====="+json);
73 }
74 }
