高效率的JSON转换工具

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?????? 在网上搜索了一番发现用json-lib进行json格式转换的还真不少，但是经过测试性能不太令人满意，同类工具中还有个后起

之秀那就是jackson，单从性能上说要比json-lib好很多，于是在项目中就决定用jackson了。
???? 但是关于jackson的资料在网上相比不是很多，于是到了官方网站看了看，把源码下载下来。帮助文档做的不太好，也没有

个现成的例子供参考。不过还好，最后在官方网（http://jackson.codehaus.org/）站的某个角落里找到了一些例子，?我在原来例子的基础上稍加改动封装了一个工具，供网友们参考，有不当之处还望拍砖指正。

????? 为性能考虑尽量少的向客户端发送数据，所以在Bean到JSON转换的时候把不需要的字段过滤掉，要完成这个功能我们必须自定义一个实现StdSerializerProvider接口的序列化器BzStdSerializerProvider，然后把这个序列化器赋给ObjectMapper即可，下面就把整个具体实现贴出来：

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1. package?com.bzlccn.oa.common.json.jackson;??
2. import?java.io.IOException;??
3. import?java.util.HashMap;??
4. import?java.util.List;??
5. import?java.util.Vector;??
6. import?org.codehaus.jackson.JsonGenerator;??
7. import?org.codehaus.jackson.JsonParseException;??
8. import?org.codehaus.jackson.map.JsonMappingException;??
9. import?org.codehaus.jackson.map.ObjectMapper;??
10. import?org.codehaus.jackson.map.SerializationConfig;??
11. import?org.codehaus.jackson.map.SerializerFactory;??
12. import?org.codehaus.jackson.map.SerializerProvider;??
13. import?org.codehaus.jackson.map.introspect.BasicBeanDescription;??
14. import?org.codehaus.jackson.map.ser.BeanPropertyWriter;??
15. import?org.codehaus.jackson.map.ser.BeanSerializer;??
16. import?org.codehaus.jackson.map.ser.CustomSerializerFactory;??
17. import?org.codehaus.jackson.map.ser.StdSerializerProvider;??
18. /**?
19. ?*?json处理工具集?
20. ?*??
21. ?*?@author?rain?
22. ?*??
23. ?*/??
24. public?class?CustomSerialization?{??
25. ????private?static?final?ObjectMapper?mapper?=?new?ObjectMapper();??
26. ????static?class?FilteredWriter?extends?BeanPropertyWriter?{??
27. ????????public?FilteredWriter(BeanPropertyWriter?w)?{??
28. ????????????super(w);??
29. ????????}??
30. ????????public?void?serializeAsField(Object?bean,?JsonGenerator?jgen,??
31. ????????????????SerializerProvider?prov)?throws?Exception?{??
32. ????????????BzStdSerializerProvider?myprov?=?(BzStdSerializerProvider)?prov;??
33. ????????????HashMap<?,??>?filter?=?myprov.getCurrentFilter();??
34. ????????????if?(filter?==?null)?{??
35. ????????????????super.serializeAsField(bean,?jgen,?prov);??
36. ????????????}?else?if?(filter.containsKey(this._name))?{??
37. ????????????????Object?subfilter?=?filter.get(this._name);??
38. ????????????????myprov.pushFilter(HashMap.class.isAssignableFrom(subfilter??
39. ????????????????????????.getClass())???(HashMap<?,??>)?subfilter?:?null);??
40. ????????????????super.serializeAsField(bean,?jgen,?prov);??
41. ????????????????myprov.popFilter();??
42. ????????????}??
43. ????????}??
44. ????}??
45. ????static?class?CustomBeanFactory?extends?CustomSerializerFactory??
46. ????{??
47. ????????@Override??
48. ????????protected?BeanSerializer?processViews(SerializationConfig?config,??
49. ????????????????BasicBeanDescription?beanDesc,?BeanSerializer?ser,??
50. ????????????????List<BeanPropertyWriter>?props)?{??
51. ????????????ser?=?super.processViews(config,?beanDesc,?ser,?props);??
52. ????????????BeanPropertyWriter[]?writers?=?props??
53. ????????????????????.toArray(new?BeanPropertyWriter[props.size()]);??
54. ????????????for?(int?i?=?0;?i?<?writers.length;?++i)?{??
55. ????????????????writers[i]?=?new?FilteredWriter(writers[i]);??
56. ????????????}??
57. ????????????ser?=?ser.withFiltered(writers);??
58. ????????????return?ser;??
59. ????????}??
60. ????}??
61. ????static?class?BzStdSerializerProvider?extends?StdSerializerProvider?{??
62. ????????private?HashMap<?,??>?_filter;??
63. ????????private?Vector<HashMap<?,??>>?_stack?=?new?Vector<HashMap<?,??>>();??
64. ????????public?BzStdSerializerProvider()?{??
65. ????????????super();??
66. ????????}??
67. ????????public?BzStdSerializerProvider(HashMap<?,??>?filter)?{??
68. ????????????super();??
69. ????????????_filter?=?filter;??
70. ????????}??
71. ????????protected?BzStdSerializerProvider(SerializationConfig?config,??
72. ????????????????StdSerializerProvider?src,?SerializerFactory?f)?{??
73. ????????????super(config,?src,?f);??
74. ????????}??
75. ????????protected?BzStdSerializerProvider(SerializationConfig?config,??
76. ????????????????StdSerializerProvider?src,?SerializerFactory?f,??
77. ????????????????HashMap<?,??>?filter)?{??
78. ????????????super(config,?src,?f);??
79. ????????????_filter?=?filter;??
80. ????????}??
81. ????????protected?StdSerializerProvider?createInstance(??
82. ????????????????SerializationConfig?config,?SerializerFactory?jsf)?{??
83. ????????????return?new?BzStdSerializerProvider(config,?this,?jsf,?_filter);??
84. ????????}??
85. ????????public?HashMap<?,??>?getCurrentFilter()?{??
86. ????????????if?(_stack.isEmpty())??
87. ????????????????return?_filter;??
88. ????????????return?_stack.lastElement();??
89. ????????}??
90. ????????public?void?pushFilter(HashMap<?,??>?filter)?{??
91. ????????????_stack.add(filter);??
92. ????????}??
93. ????????public?void?popFilter()?{??
94. ????????????if?(!_stack.isEmpty())?{??
95. ????????????????_stack.removeElement(_stack.lastElement());??
96. ????????????}??
97. ????????}??
98. ????}??
99. ????/**?
100. ?????*?把对应的bean转换成json串,并可以对多余的字段进行过滤?
101. ?????*?@param?bean?要转换的bean?
102. ?????*?@param?filter?过滤字符串?
103. ?????*?@return?
104. ?????*/??
105. ????public?static?String?writeBean(ObjectMapper?mapper,Object?bean,?String?filter)?{??
106. ????????try?{??
107. ????????????if?(bean?!=?null?&&?filter?!=?null)?{??
108. ????????????????HashMap<?,??>?filterMap?=?mapper.readValue(filter,??
109. ????????????????????????HashMap.class);??
110. ????????????????mapper.setSerializerProvider(new?BzStdSerializerProvider(??
111. ????????????????????????filterMap));??
112. ????????????????mapper.setSerializerFactory(new?CustomBeanFactory());??
113. ????????????????return?mapper.viewWriter(String.class).writeValueAsString(bean);??
114. ????????????}??
115. ????????}?catch?(JsonParseException?e)?{??
116. ????????????e.printStackTrace();??
117. ????????}?catch?(JsonMappingException?e)?{??
118. ????????????e.printStackTrace();??
119. ????????}?catch?(IOException?e)?{??
120. ????????????e.printStackTrace();??
121. ????????}??
122. ????????return?null;??
123. ????}??
124. ????/**?
125. ?????*?把对应的bean转换成json串,并可以对多余的字段进行过滤?
126. ?????*?@param?bean?要转换的bean?
127. ?????*?@param?filter?过滤字符串?
128. ?????*?@return?
129. ?????*/??
130. ????public?static?String?writeBean(Object?bean,?String?filter)?{??
131. ????????try?{??
132. ????????????if?(bean?!=?null?&&?filter?!=?null)?{??
133. ????????????????HashMap<?,??>?filterMap?=?mapper.readValue(filter,??
134. ????????????????????????HashMap.class);??
135. ????????????????mapper.setSerializerProvider(new?BzStdSerializerProvider(??
136. ????????????????????????filterMap));??
137. ????????????????mapper.setSerializerFactory(new?CustomBeanFactory());??
138. ????????????????return?mapper.viewWriter(String.class).writeValueAsString(bean);??
139. ????????????}??
140. ????????}?catch?(JsonParseException?e)?{??
141. ????????????e.printStackTrace();??
142. ????????}?catch?(JsonMappingException?e)?{??
143. ????????????e.printStackTrace();??
144. ????????}?catch?(IOException?e)?{??
145. ????????????e.printStackTrace();??
146. ????????}??
147. ????????return?null;??
148. ????}??
149. ????/**?
150. ?????*?把javabean转换成json串?
151. ?????*?@param?bean?
152. ?????*?@return?
153. ?????*/??
154. ????public?static?String?writeBean(Object?bean)?{??
155. ????????try?{??
156. ????????????if?(bean?!=?null)?{??
157. ????????????????return?mapper.writeValueAsString(bean);??
158. ????????????}??
159. ????????}?catch?(JsonParseException?e)?{??
160. ????????????e.printStackTrace();??
161. ????????}?catch?(JsonMappingException?e)?{??
162. ????????????e.printStackTrace();??
163. ????????}?catch?(IOException?e)?{??
164. ????????????e.printStackTrace();??
165. ????????}??
166. ????????return?null;??
167. ????}??
168. }??

上述类只是一个实现过滤功能的Bean to Json的工具类，当然你也可以继续扩展。下面我们继续完善，提供一个综合的，支持过滤的，能JSON互转的，转换内容以及方法能自定义的一个综合JSON转换工具，当然要有上边的类做支持了。这是一个基于接口的动态代理的实现，

具体代码如下。

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1. package?com.bzlccn.oa.common.json.jackson;??
2. ??
3. import?java.io.*;??
4. import?java.lang.reflect.InvocationHandler;??
5. import?java.lang.reflect.Method;??
6. import?java.lang.reflect.Proxy;??
7. import?java.lang.reflect.Type;??
8. import?java.net.URL;??
9. import?java.util.LinkedHashMap;??
10. import?java.util.Map;??
11. import?org.codehaus.jackson.JsonEncoding;??
12. import?org.codehaus.jackson.JsonGenerator;??
13. import?org.codehaus.jackson.JsonParser;??
14. import?org.codehaus.jackson.map.JsonMappingException;??
15. import?org.codehaus.jackson.map.ObjectMapper;??
16. import?org.codehaus.jackson.map.RuntimeJsonMappingException;??
17. import?org.codehaus.jackson.map.SerializationConfig;??
18. import?org.codehaus.jackson.map.type.TypeFactory;??
19. import?org.codehaus.jackson.type.JavaType;??
20. ??
21. public?class?JacksonProxy?{??
22. ?????private?JacksonProxy()?{}??
23. ????????public?static?<T>?T?newProxyInstance(Class<T>?type,?Class<?>...?additionalTypes)?{??
24. ????????????ObjectMapper?objectMapper?=?new?ObjectMapper();??
25. ????????????return?newProxyInstance(objectMapper,?type,?additionalTypes);??
26. ????????}??
27. ????????public?static?<T>?T?newProxyInstance(ObjectMapper?objectMapper,?Class<T>?type,?Class<?>...?additionalTypes)?{??
28. ????????????ClassLoader?classLoader?=?Thread.currentThread().getContextClassLoader();??
29. ????????????if?(classLoader?==?null)?classLoader?=?type.getClassLoader();??
30. ????????????Class<?>[]?interfaces?=?new?Class<?>[additionalTypes.length?+?1];??
31. ????????????interfaces[0]?=?type;??
32. ????????????System.arraycopy(additionalTypes,?0,?interfaces,?1,?additionalTypes.length);??
33. ????????????InvocationHandler?invocationHandler?=?new?JsonInvocationHandler(objectMapper,?interfaces);??
34. ????????????Object?proxy?=?Proxy.newProxyInstance(classLoader,?interfaces,?invocationHandler);??
35. ????????????return?type.cast(proxy);??
36. ????????}??
37. ????????public?static?ObjectMapper?getObjectMapper(Object?proxy)?{??
38. ????????????InvocationHandler?invocationHandler?=?Proxy.getInvocationHandler(proxy);??
39. ????????????if?(invocationHandler?instanceof?JsonInvocationHandler)?{??
40. ????????????????JsonInvocationHandler?jsonInvocationHandler?=?(JsonInvocationHandler)?invocationHandler;??
41. ????????????????return?jsonInvocationHandler.getObjectMapper();??
42. ????????????}??
43. ????????????throw?new?IllegalArgumentException("Proxy?is?not?a?JacksonProxy");??
44. ????????}??
45. ????????public?static?class?JsonInvocationHandler?implements?InvocationHandler?{??
46. ????????????private?final?ObjectMapper?objectMapper;??
47. ????????????private?final?Map<Method,?Handler>?handlers?=?new?LinkedHashMap<Method,?Handler>();??
48. ????????????public?JsonInvocationHandler(ObjectMapper?objectMapper,?Class<?>[]?interfaces)?{??
49. ????????????????if?(objectMapper?==?null)?throw?new?NullPointerException("mapper?is?null");??
50. ????????????????if?(interfaces?==?null)?throw?new?NullPointerException("type?is?null");??
51. ????????????????this.objectMapper?=?objectMapper;??
52. ????????????????for?(Class<?>?type?:?interfaces)?{??
53. ????????????????????for?(Method?method?:?type.getMethods())?{??
54. ????????????????????????String?name?=?method.getName();??
55. ????????????????????????Class<?>[]?parameterTypes?=?method.getParameterTypes();??
56. ????????????????????????Class<?>?returnType?=?method.getReturnType();??
57. ????????????????????????if?(name.startsWith("read"))?{??
58. ????????????????????????????if?(parameterTypes.length?==?1?&&?!returnType.equals(Void.TYPE))?{??
59. ????????????????????????????????ReadHandler?handler?=?new?ReadHandler(objectMapper,?method.getGenericReturnType(),?canThrowIOException(method));??
60. ????????????????????????????????handlers.put(method,?handler);??
61. ????????????????????????????}??
62. ????????????????????????}?else?if?(name.startsWith("write"))?{??
63. ????????????????????????????if?(Void.TYPE.equals(returnType))?{??
64. ????????????????????????????????WriteHandler?handler?=?new?WriteHandler(objectMapper,?null,?canThrowIOException(method));??
65. ????????????????????????????????handlers.put(method,?handler);??
66. ????????????????????????????}else{??
67. ????????????????????????????????WriteHandler?handler?=?new?WriteHandler(objectMapper,?returnType,?canThrowIOException(method));??
68. ????????????????????????????????handlers.put(method,?handler);??
69. ????????????????????????????}??
70. ????????????????????????}??
71. ????????????????????}??
72. ????????????????}??
73. ????????????}??
74. ????????????public?ObjectMapper?getObjectMapper()?{??
75. ????????????????return?objectMapper;??
76. ????????????}??
77. ????????????@Override??
78. ????????????public?Object?invoke(Object?proxy,?Method?method,?Object[]?args)?throws?Throwable?{??
79. ????????????????Handler?handler?=?handlers.get(method);??
80. ????????????????if?(handler?==?null)?{??
81. ????????????????????throw?new?UnsupportedOperationException(method.toString());??
82. ????????????????}??
83. ????????????????return?handler.invoke(args);??
84. ????????????}??
85. ????????????private?static?boolean?canThrowIOException(Method?method)?{??
86. ????????????????for?(Class<?>?exceptionType?:?method.getExceptionTypes())?{??
87. ????????????????????if?(IOException.class.isAssignableFrom(exceptionType))?{??
88. ????????????????????????return?true;??
89. ????????????????????}??
90. ????????????????}??
91. ????????????????return?false;??
92. ????????????}??
93. ????????}??
94. ????????private?static?interface?Handler?{??
95. ????????????Object?invoke(Object[]?args)?throws?Throwable;??
96. ????????}??
97. ????????private?static?class?ReadHandler?implements?Handler?{??
98. ????????????private?final?ObjectMapper?mapper;??
99. ????????????private?final?JavaType?javaType;??
100. ????????????private?final?boolean?canThrowIoException;??
101. ????????????public?ReadHandler(ObjectMapper?mapper,?Type?type,?boolean?canThrowIoException)?{??
102. ????????????????this.mapper?=?mapper;??
103. ????????????????javaType?=?TypeFactory.fromType(type);??
104. ????????????????this.canThrowIoException?=?canThrowIoException;??
105. ????????????}??
106. ????????????@Override??
107. ????????????public?Object?invoke(Object[]?args)?throws?Throwable?{??
108. ????????????????try?{??
109. ????????????????????Object?source?=?args[0];??
110. ????????????????????return?read(source);??
111. ????????????????}?catch?(IOException?e)?{??
112. ????????????????????if?(canThrowIoException)?{??
113. ????????????????????????throw?e;??
114. ????????????????????}?else?{??
115. ????????????????????????throw?new?RuntimeJsonMappingException((JsonMappingException)?e);??
116. ????????????????????}??
117. ????????????????}??
118. ????????????}??
119. ????????????public?Object?read(Object?source)?throws?IOException?{??
120. ????????????????if?(source?==?null)?{??
121. ????????????????????throw?new?NullPointerException("source?is?null");??
122. ????????????????}??
123. ????????????????JsonParser?parser;??
124. ????????????????if?(source?instanceof?String)?{??
125. ????????????????????String?string?=?(String)?source;??
126. ????????????????????parser?=?mapper.getJsonFactory().createJsonParser(string);??
127. ????????????????}?else?if?(source?instanceof?byte[])?{??
128. ????????????????????byte[]?bytes?=?(byte[])?source;??
129. ????????????????????parser?=?mapper.getJsonFactory().createJsonParser(bytes);??
130. ????????????????}?else?if?(source?instanceof?Reader)?{??
131. ????????????????????Reader?reader?=?(Reader)?source;??
132. ????????????????????parser?=?mapper.getJsonFactory().createJsonParser(reader);??
133. ????????????????????parser.disableFeature(JsonParser.Feature.AUTO_CLOSE_SOURCE);??
134. ????????????????}?else?if?(source?instanceof?InputStream)?{??
135. ????????????????????InputStream?inputStream?=?(InputStream)?source;??
136. ????????????????????parser?=?mapper.getJsonFactory().createJsonParser(inputStream);??
137. ????????????????????parser.disableFeature(JsonParser.Feature.AUTO_CLOSE_SOURCE);??
138. ????????????????}?else?if?(source?instanceof?File)?{??
139. ????????????????????File?file?=?(File)?source;??
140. ????????????????????parser?=?mapper.getJsonFactory().createJsonParser(file);??
141. ????????????????}?else?if?(source?instanceof?URL)?{??
142. ????????????????????URL?url?=?(URL)?source;??
143. ????????????????????parser?=?mapper.getJsonFactory().createJsonParser(url);??
144. ????????????????}?else?{??
145. ????????????????????throw?new?UnsupportedOperationException("Unsupported?source?type?"?+?source.getClass()?+?"?for?JSON?read?method");??
146. ????????????????}??
147. ????????????????try?{??
148. ????????????????????return?mapper.readValue(parser,?javaType);??
149. ????????????????}?finally?{??
150. ????????????????????parser.close();??
151. ????????????????}??
152. ????????????}??
153. ????????}??
154. ????????private?static?class?WriteHandler?implements?Handler?{??
155. ????????????private?final?ObjectMapper?mapper;??
156. ????????????private?final?Class<?>?returnType;??
157. ????????????private?final?boolean?canThrowIoException;??
158. ????????????public?WriteHandler(ObjectMapper?mapper,?Class<?>?returnType,?boolean?canThrowIoException)?{??
159. ????????????????this.mapper?=?mapper;??
160. ????????????????this.returnType?=?returnType;??
161. ????????????????this.canThrowIoException?=?canThrowIoException;??
162. ????????????}??
163. ????????????@Override??
164. ????????????public?Object?invoke(Object[]?args)?throws?Throwable?{??
165. ????????????????try?{??
166. ????????????????????Object?value?=?args[0];??
167. ????????????????????if?(returnType?==?null)?{??
168. ????????????????????????Object?target?=?args[1];??
169. ????????????????????????write(value,?target);??
170. ????????????????????????return?null;??
171. ????????????????????}?else?if?(String.class.equals(returnType))?{??
172. ????????????????????????if?(args.length>=2&&args[1]!=null)?{//如果返回类型是String且有第二个参数，那么就默认第二个参数为过滤参数??
173. ????????????????????????????return?CustomSerialization.writeBean(value,?args[1].toString());??
174. ????????????????????????}?else?{??
175. ????????????????????????????StringWriter?stringWriter?=?new?StringWriter();??
176. ????????????????????????????write(value,?stringWriter);??
177. ????????????????????????????return?stringWriter.toString();??
178. ????????????????????????}??
179. ????????????????????}?else?if?(byte[].class.equals(returnType))?{??
180. ????????????????????????ByteArrayOutputStream?out?=?new?ByteArrayOutputStream();??
181. ????????????????????????write(value,?out);??
182. ????????????????????????return?out.toByteArray();??
183. ????????????????????}?else?{??
184. ????????????????????????throw?new?UnsupportedOperationException("Unsupported?target?type?"?+?returnType?+?"?for?JSON?write?method");??
185. ????????????????????}??
186. ????????????????}?catch?(IOException?e)?{??
187. ????????????????????if?(canThrowIoException)?{??
188. ????????????????????????throw?e;??
189. ????????????????????}?else?{??
190. ????????????????????????throw?new?RuntimeJsonMappingException((JsonMappingException)?e);??
191. ????????????????????}??
192. ????????????????}??
193. ????????????}??
194. ????????????public?void?write(Object?value,?Object?target)?throws?IOException?{??
195. ????????????????if?(target?==?null)?{??
196. ????????????????????throw?new?NullPointerException("target?is?null");??
197. ????????????????}??
198. ????????????????JsonGenerator?generator;??
199. ????????????????if?(target?instanceof?Writer)?{??
200. ????????????????????Writer?writer?=?(Writer)?target;??
201. ????????????????????generator?=?mapper.getJsonFactory().createJsonGenerator(writer);??
202. ????????????????????generator.disableFeature(JsonGenerator.Feature.AUTO_CLOSE_TARGET);??
203. ????????????????}?else?if?(target?instanceof?OutputStream)?{??
204. ????????????????????OutputStream?outputStream?=?(OutputStream)?target;??
205. ????????????????????generator?=?mapper.getJsonFactory().createJsonGenerator(outputStream,?JsonEncoding.UTF8);??
206. ????????????????????generator.disableFeature(JsonGenerator.Feature.AUTO_CLOSE_TARGET);??
207. ????????????????}?else?if?(target?instanceof?File)?{??
208. ????????????????????File?file?=?(File)?target;??
209. ????????????????????generator?=?mapper.getJsonFactory().createJsonGenerator(file,?JsonEncoding.UTF8);??
210. ????????????????}?else?{??
211. ????????????????????throw?new?UnsupportedOperationException("Unsupported?target?type?"?+?target.getClass()?+?"?for?JSON?write?method");??
212. ????????????????}??
213. ????????????????if?(mapper.getSerializationConfig().isEnabled(SerializationConfig.Feature.INDENT_OUTPUT))?{??
214. ????????????????????generator.useDefaultPrettyPrinter();??
215. ????????????????}??
216. ??????????????????
217. ????????????????try?{??
218. ????????????????????mapper.writeValue(generator,?value);??
219. ????????????????}?finally?{??
220. ????????????????????generator.close();??
221. ????????????????}??
222. ????????????}??
223. ????????}??
224. }??

接口代码：

?

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1. package?com.bzlccn.oa.common.json.jackson;??
2. import?java.io.IOException;??
3. import?java.io.InputStream;??
4. import?java.io.OutputStream;??
5. import?java.io.Reader;??
6. import?java.io.Writer;??
7. import?java.util.List;??
8. import?java.util.Map;??
9. ??
10. public??interface?JsonInterface?{??
11. ????String?readString(String?value)?throws?IOException;??
12. ????int?readInt(String?value);??
13. ????Integer?readInteger(String?value);??
14. ????Object?readBean(String?value);??
15. ????List<String>?readStringList(String?value)?throws?IOException;??
16. ????int[]?readIntArray(String?value);??
17. ????List<Integer>?readIntegerList(String?value);??
18. ??????
19. ????List<Short>?readShortList(String?value);??
20. ??????
21. ????List<Object>?readBeanList(String?value);??
22. ??????
23. ????List<Map<String,Object>>?readBeanByMap(String?value);??
24. ????List<Object>?readBeanList(byte[]?value);??
25. ????List<Object>?readBeanList(Reader?value);??
26. ????List<Object>?readBeanList(InputStream?value);??
27. ????String?writeString(String?value)?throws?IOException;??
28. ????String?writeInt(int?value);??
29. ????String?writeInteger(Integer?value);??
30. ????String?writeBean(Object?value);??
31. ??????
32. ????String?writeBean(Object?value,String?filter);??
33. ????String?writeStringList(List<String>?value)?throws?IOException;??
34. ????String?writeIntArray(int[]?value);??
35. ????String?writeIntegerList(List<Integer>?value);??
36. ????String?writeBeanList(List<?>?value);??
37. ??????
38. ????String?writeBeanList(List<?>?value,String?filter);??
39. ????void?writeBeanList(List<?>?value,?Writer?writer);??
40. ????void?writeBeanList(List<?>?value,?OutputStream?writer);??
41. ????byte[]?writeBeanListToByteArray(List<?>?value);??
42. }??

最终供调用的工具代码：

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1. package?com.bzlccn.oa.common.json;??
2. import?java.io.IOException;??
3. import?java.io.InputStream;??
4. import?java.io.OutputStream;??
5. import?java.io.Reader;??
6. import?java.io.Writer;??
7. import?java.util.ArrayList;??
8. import?java.util.List;??
9. import?org.codehaus.jackson.map.ObjectMapper;??
10. import?org.codehaus.jackson.map.SerializationConfig.Feature;??
11. import?com.bzlccn.oa.common.json.jackson.JacksonProxy;??
12. import?com.bzlccn.oa.common.json.jackson.JsonInterface;??
13. ??
14. /**?
15. ?*?json处理工具集?
16. ?*??
17. ?*?@author?rain?
18. ?*??
19. ?*/??
20. public?class?JsonUtil{??
21. ????private?static?JsonInterface?json;??
22. ????static{??
23. ????????ObjectMapper?mapper?=?new?ObjectMapper();??
24. ????????mapper.configure(Feature.INDENT_OUTPUT,?true);??
25. ????????json?=?JacksonProxy.newProxyInstance(mapper,?JsonInterface.class);??
26. ????}??
27. ????public?static?JsonInterface?getTool(){??
28. ????????return?json;??
29. ????}??
30. ??????
31. //**********************************************************************************??
32. ???????static?class?ViewBean??
33. ???????{??
34. ???????????public?String?name;??
35. ???????????public?String?value;??
36. ???????????public?String?secret;??
37. ???????????public??ViewBean??sibling;??
38. ???????????public??ViewBeanChild???child;??
39. ???????????public?ViewBean(String?name,?String?value,?String?secret)?{??
40. ???????????????this.name?=?name;??
41. ???????????????this.value?=?value;??
42. ???????????????this.secret?=?secret;??
43. ?????????????child?=?new?ViewBeanChild();??
44. ???????????}??
45. ???????}??
46. ???????static?class?ViewBeanChild??
47. ???????{??
48. ???????????public??long??id?=?123;??
49. ???????????public?String?name?=?"child";??
50. ???????????public?String?address?=?"123?Street";??
51. ???????}??
52. ????public?static?void?main(String[]?args)?throws?Exception?{??
53. ????????ViewBean?bean?=?new?ViewBean("mr?bean",?null,?"secret!");??
54. ????????bean.sibling?=?new?ViewBean("sibling",?"lala",?"boooo");??
55. ????????String??filter?=?"{\"name\":0,\"value\":0,\"sibling\":{\"name\":0},?\"child\":{\"id\":0,\"address\":0}}";??
56. ??????????
57. ????????System.out.println(json.writeBean(bean,filter));??
58. ????}??
59. }??

这样实现的一个好处就是方法可以自定义，向把json串转换成什么类型的bean只要在JsonInterface接口中申明就可以了。这个是基于

jackson1.5版本实现的。