JSONObject返回到前端转化出错

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错误代码：

javax.ws.rs.WebApplicationException: com.sun.jersey.api.MessageException: A message body writer for Java class net.sf.json.JSONObject, and Java type class net.sf.json.JSONObject, and MIME media type application/json was not found.

   at com.sun.jersey.spi.container.ContainerResponse.write(ContainerResponse.java:284)
   at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1510)
   at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419)
   at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409)
   at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409)
   at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:540)
   at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:715)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
   at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
   at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
   at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
   at java.lang.Thread.run(Thread.java:619)
Caused by: com.sun.jersey.api.MessageException: A message body writer for Java class net.sf.json.JSONObject, and Java type class net.sf.json.JSONObject, and MIME media type application/json was not found.

   ... 20 more

解决办法：

一直转化出错的原因是导错了JSONObject所属的jar包,因为有好几种包都有此类，最后偶然之下导入org.codehaus.jettison.json.JSONObject即导入jettison.jar,才传入前端，我也不是太明白，但确实正确了，我也是新手，希望能帮到你！

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