01.package com.jetsum.util;
02.
03.import java.io.StringReader;
04.import java.lang.reflect.Field;
05.import java.util.ArrayList;
06.import java.util.List;
07.import java.util.Map;
08.import java.util.Set;
09.
10.import antlr.RecognitionException;
11.import antlr.TokenStreamException;
12.
13.import com.sdicons.json.mapper.JSONMapper;
14.import com.sdicons.json.mapper.MapperException;
15.import com.sdicons.json.model.JSONArray;
16.import com.sdicons.json.model.JSONValue;
17.import com.sdicons.json.parser.JSONParser;
18.
19.public class JsonUtil {
20.
21. /**
22. * JAVA对象转换成JSON字符串
23. * @param obj
24. * @return
25. * @throws MapperException
26. */
27. public static String objectToJsonStr(Object obj) throws MapperException{
28. JSONValue jsonValue = JSONMapper.toJSON(obj);
29. String jsonStr = jsonValue.render(false);
30. return jsonStr;
31. }
32.
33. /**
34. * 重载objectToJsonStr方法
35. * @param obj 需要转换的JAVA对象
36. * @param format 是否格式化
37. * @return
38. * @throws MapperException
39. */
40. public static String objectToJsonStr(Object obj,boolean format) throws MapperException{
41. JSONValue jsonValue = JSONMapper.toJSON(obj);
42. String jsonStr = jsonValue.render(format);
43. return jsonStr;
44. }
45.
46. /**
47. * JSON字符串转换成JAVA对象
48. * @param jsonStr
49. * @param cla
50. * @return
51. * @throws MapperException
52. * @throws TokenStreamException
53. * @throws RecognitionException
54. */
55. @SuppressWarnings({ "rawtypes", "unchecked" })
56. public static Object jsonStrToObject(String jsonStr,Class<?> cla) throws MapperException, TokenStreamException, RecognitionException{
57. Object obj = null;
58. try{
59. JSONParser parser = new JSONParser(new StringReader(jsonStr));
60. JSONValue jsonValue = parser.nextValue();
61. if(jsonValue instanceof com.sdicons.json.model.JSONArray){
62. List list = new ArrayList();
63. JSONArray jsonArray = (JSONArray) jsonValue;
64. for(int i=0;i<jsonArray.size();i++){
65. JSONValue jsonObj = jsonArray.get(i);
66. Object javaObj = JSONMapper.toJava(jsonObj,cla);
67. list.add(javaObj);
68. }
69. obj = list;
70. }else if(jsonValue instanceof com.sdicons.json.model.JSONObject){
71. obj = JSONMapper.toJava(jsonValue,cla);
72. }else{
73. obj = jsonValue;
74. }
75. }catch(Exception e){
76. e.printStackTrace();
77. }
78. return obj;
79. }
80.
81. /**
82. * 将JAVA对象转换成JSON字符串
83. * @param obj
84. * @return
85. * @throws IllegalArgumentException
86. * @throws IllegalAccessException
87. */
88. @SuppressWarnings("rawtypes")
89. public static String simpleObjectToJsonStr(Object obj,List<Class> claList) throws IllegalArgumentException, IllegalAccessException{
90. if(obj==null){
91. return "null";
92. }
93. String jsonStr = "{";
94. Class<?> cla = obj.getClass();
95. Field fields[] = cla.getDeclaredFields();
96. for (Field field : fields) {
97. field.setAccessible(true);
98. if(field.getType() == long.class){
99. jsonStr += "\""+field.getName()+"\":"+field.getLong(obj)+",";
100. }else if(field.getType() == double.class){
101. jsonStr += "\""+field.getName()+"\":"+field.getDouble(obj)+",";
102. }else if(field.getType() == float.class){
103. jsonStr += "\""+field.getName()+"\":"+field.getFloat(obj)+",";
104. }else if(field.getType() == int.class){
105. jsonStr += "\""+field.getName()+"\":"+field.getInt(obj)+",";
106. }else if(field.getType() == boolean.class){
107. jsonStr += "\""+field.getName()+"\":"+field.getBoolean(obj)+",";
108. }else if(field.getType() == Integer.class||field.getType() == Boolean.class
109. ||field.getType() == Double.class||field.getType() == Float.class
110. ||field.getType() == Long.class){
111. jsonStr += "\""+field.getName()+"\":"+field.get(obj)+",";
112. }else if(field.getType() == String.class){
113. jsonStr += "\""+field.getName()+"\":\""+field.get(obj)+"\",";
114. }else if(field.getType() == List.class){
115. String value = simpleListToJsonStr((List<?>)field.get(obj),claList);
116. jsonStr += "\""+field.getName()+"\":"+value+",";
117. }else{
118. if(claList!=null&&claList.size()!=0&&claList.contains(field.getType())){
119. String value = simpleObjectToJsonStr(field.get(obj),claList);
120. jsonStr += "\""+field.getName()+"\":"+value+",";
121. }else{
122. jsonStr += "\""+field.getName()+"\":null,";
123. }
124. }
125. }
126. jsonStr = jsonStr.substring(0,jsonStr.length()-1);
127. jsonStr += "}";
128. return jsonStr;
129. }
130.
131. /**
132. * 将JAVA的LIST转换成JSON字符串
133. * @param list
134. * @return
135. * @throws IllegalArgumentException
136. * @throws IllegalAccessException
137. */
138. @SuppressWarnings("rawtypes")
139. public static String simpleListToJsonStr(List<?> list,List<Class> claList) throws IllegalArgumentException, IllegalAccessException{
140. if(list==null||list.size()==0){
141. return "[]";
142. }
143. String jsonStr = "[";
144. for (Object object : list) {
145. jsonStr += simpleObjectToJsonStr(object,claList)+",";
146. }
147. jsonStr = jsonStr.substring(0,jsonStr.length()-1);
148. jsonStr += "]";
149. return jsonStr;
150. }
151.
152. /**
153. * 将JAVA的MAP转换成JSON字符串，
154. * 只转换第一层数据
155. * @param map
156. * @return
157. */
158. public static String simpleMapToJsonStr(Map<?,?> map){
159. if(map==null||map.isEmpty()){
160. return "null";
161. }
162. String jsonStr = "{";
163. Set<?> keySet = map.keySet();
164. for (Object key : keySet) {
165. jsonStr += "\""+key+"\":\""+map.get(key)+"\",";
166. }
167. jsonStr = jsonStr.substring(0,jsonStr.length()-1);
168. jsonStr += "}";
169. return jsonStr;
170. }
171.}
将JAVA对象转换成JSON字符串 .
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转载自zgq456.iteye.com/blog/1927600
周排行