使用json要导入什么包

json-lib-2.3-jdk15.jar 
commons-beanutils-1.7.0.jar 
commons-httpclient-3.1.jar 
commons-lang-2.3.jar 
commons-logging-1.0.4.jar 
commons-collections-3.1.jar 
ezmorph-1.0.3.jar 
这些包可以从一下地方下载: 
http://commons.apache.org/index.html 
http://json-lib.sourceforge.net/ 
http://ezmorph.sourceforge.net/ 
http://www.docjar.com/ 
如果不关联这些包,则会出现以下错误: 
java.lang.NoClassDefFoundError: net/sf/ezmorph/Morpher 
java.lang.NoClassDefFoundError: org/apache/commons/collections/map/ListOrderedMap 
java.lang.NoClassDefFoundError: org/apache/commons/beanutils/DynaBean 
java.lang.NoClassDefFoundError: org/apache/commons/codec/DecoderException 
java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException 
java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory

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