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Google? gson? ?? ?????

1. Json ?? ?? jar ??? ????

commons-beanutils-1.7.0.jar
commons-collections-3.2.1.jar
commons-lang-2.6.jar
commons-logging-1.1.3.jar
ezmorph-1.0.6.jar
json-lib-2.4-jdk15.jar
log4j-1.2.9.jar
slf4j-api-1.6.4.jar

2. JSONObject? ???? ??????.

??? ???? ??? ????.

Alibaba?? ??? fastjson,
JSONObject json = new JSONObject(); json.put("contractCode", "2017021001")
return json.toJSONString();

Gson? ???? ???? ???? ????

Maven ????? ?? fastjson? ????
???? ??? ? ????

?? ????? jackson, gson, fastjson ?? ?? ?? ?? json? ??????. ?????? ??? fastjson? ?????. Spring? ????? jackson? ????? ??? ?? ?? ? ????. ?? ???? ?????. ?? ??? ???