将List集合转为json

╰+哭是因爲堅強的太久メ 2022-03-10 02:20 293阅读 0赞

需要导入的jar包

json-lib-2.4-jdk15.jar           [下载地址][Link 1]  
commons-httpclient-3.1.jar [下载地址][Link 2]  
ezmorph-1.0.6.jar               [下载地址][Link 3]  
morph-1.1.1.zip                  [下载地址][Link 4]  
commons-lang-2.6.jar        [下载地址][Link 5]

如果只导入json-lib-2.4-jdk15.jar会报以下错误

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 <td style="vertical-align:top;width:415.1pt;"> java.lang.reflect.InvocationTargetException &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.lang.reflect.Method.invoke(Method.java:498) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.store.web.base.BaseServlet.service(BaseServlet.java:34) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at javax.servlet.http.HttpServlet.service(HttpServlet.java:741) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.store.web.filter.EncodingFilter.doFilter(EncodingFilter.java:35) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:651) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:412) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:754) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1385) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.NoClassDefFoundError: org/apache/commons/lang/exception/NestableRuntimeException &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.lang.ClassLoader.defineClass1(Native Method) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.lang.ClassLoader.defineClass(ClassLoader.java:763) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2320) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:816) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1261) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1121) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at com.store.web.servlet.CategoryServlet.findAllCats(CategoryServlet.java:25) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ... 31 more Caused by: java.lang.ClassNotFoundException: org.apache.commons.lang.exception.NestableRuntimeException &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1292) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1121) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ... 39 more </td> 
 </tr> 
 </tbody> 
</table>

[Link 1]: https://sourceforge.net/projects/json-lib/
[Link 2]: https://mvnrepository.com/artifact/commons-httpclient/commons-httpclient/3.1
[Link 3]: https://sourceforge.net/projects/ezmorph/files/latest/download
[Link 4]: https://sourceforge.net/projects/morph/files/latest/download
[Link 5]: http://commons.apache.org/proper/commons-lang/download_lang.cgi