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我想從下面的JSON中獲取JSON密鑰的值，這是在運行時使用Pojo生成器創建的動態庫。Java反射幫助需要在JAVA中獲取JSON KEY的值Spring
我的代碼
System.out.println("inside the getFilterCOndition method and the values are "+ new ObjectMapper().writeValueAsString(input));
Object a = input.getClass().newInstance();
System.out.println("inside the getFilterCOndition method and the values are "+new ObjectMapper().writeValueAsString(input.getClass().getDeclaredFields()));
Object z = input.getClass().newInstance();
System.out.println("z "+ z);
List<String> items = Arrays.asList(props.getProperty("input.from.ui.for.filters").split(","));
System.out.println("getFilterCondition loop "+ items);
if(input!=null && !(input==null)){
System.out.println(" inside the not null loop and the value is -----The input is "+ type.getDeclaredField("obj1"));
//Object o = input
System.out.println(" inside the not null loop and the value is -----The input is "+ input.getClass().getDeclaredClasses());
for (int i = 0; i < items.size(); i++) {
System.out.println("Inside the for loop of filtercondition "+items.get(i));
if(items.get(i).split("~")[1].equalsIgnoreCase("String")){
System.out.println("insid the if loop "+ "items.get(i) value is " + items.get(i));
System.out.println("props.getProperty(items.get(i)).split()[0] -is-- "+items.get(i).split("~")[0]);
System.out.println("trying for type.getDeclaredField() -- "+ type.getDeclaredField("obj1"));
if(type.getDeclaredField((items.get(i)).split("~")[0])!=null){
queryFilter += " AND (" + ((items.get(i))).split("~")[0]+ BPMConstants.EQUALS + BPMConstants.SINGLE_QUOTES + type.getDeclaredField((items.get(i)).split("~")[0]) + BPMConstants.SINGLE_QUOTES + ")";
}
} else if(items.get(i).split("~")[1].equalsIgnoreCase("Integer")){
if(type.getDeclaredField((items.get(i)).split("~")[0])!=null){
queryFilter += " AND (" + ((items.get(i))).split("~")[0]+ BPMConstants.EQUALS + BPMConstants.SINGLE_QUOTES + type.getDeclaredField((items.get(i)).split("~")[0]) + BPMConstants.SINGLE_QUOTES + ")";
}
} else if(items.get(i).split("~")[1].equalsIgnoreCase("Boolean")){
if(type.getDeclaredField((items.get(i)).split("~")[0])!=null){
queryFilter += " AND (" + ((items.get(i))).split("~")[0]+ BPMConstants.EQUALS + BPMConstants.SINGLE_QUOTES + type.getDeclaredField((items.get(i)).split("~")[0]) + BPMConstants.SINGLE_QUOTES + ")";
}
} else {
System.out.println("inside the else final loop the props.getProperty(items.get(i)) value is "+ ((items.get(i)).split("~")[0]));
if(type.getDeclaredField((items.get(i)).split("~")[0])!=null){
Field multiSelectItems1 = type.getDeclaredField((items.get(i)).split("~")[0]);
//List<Field> multiSelectItems = Arrays.asList(multiSelectItems1);
List<String> multiSelectItems = Arrays.asList((multiSelectItems1.getName().split(",")));
queryFilter += " AND (";
for (int j = 0; j < multiSelectItems.size(); j++) {
queryFilter += ((items.get(i))).split("~")[0]+ BPMConstants.EQUALS + BPMConstants.SINGLE_QUOTES + multiSelectItems.get(j) + BPMConstants.SINGLE_QUOTES;
if(j< multiSelectItems.size()-1){
queryFilter += " OR ";
}
}
queryFilter += ")";
}
}
}
System.out.println("The QueryFilter frmaed before replacing the characters --- "+queryFilter);
/*queryFilter = queryFilter.replaceFirst(" AND (", "");
queryFilter = queryFilter.replaceFirst(")", "");*/
}
控制檯中的樣品是:::
INFO: Server startup in 13901 ms
[2015-10-17 20:39:48,693]:org.springframework.web.servlet.DispatcherServlet-[DEBUG]: DispatcherServlet with name 'bpm-service' processing POST request for [/Inbox/bpm/getGrid]
[2015-10-17 20:39:48,701]:org.springframework.web.servlet.handler.AbstractHandlerMethodMapping-[DEBUG]: Looking up handler method for path /bpm/getGrid
[2015-10-17 20:39:48,706]:org.springframework.web.servlet.handler.AbstractHandlerMethodMapping-[DEBUG]: Returning handler method [public com.db.checklist.model.wrapper.TaskEODOutput com.db.checklist.controller.RestController.getGrid(javax.servlet.http.HttpServletRequest,com.db.checklist.model.wrapper.TaskInput)]
[2015-10-17 20:39:48,707]:org.springframework.beans.factory.support.AbstractBeanFactory-[DEBUG]: Returning cached instance of singleton bean 'restController'
[2015-10-17 20:39:48,813]:org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver-[DEBUG]: Reading [class com.db.checklist.model.wrapper.TaskInput] as "application/json;charset=UTF-8" using [org.springfr[email protected]7e7642b3]
inside the getFilterCOndition method and the values are [{"obj3":"one,two,three,four,five","obj4":true,"obj1":"String1","obj2":35}]
inside the getFilterCOndition method and the values are [{"name":"serialVersionUID","type":"long","modifiers":26,"annotations":[],"declaredAnnotations":[],"declaringClass":"java.util.ArrayList","synthetic":false,"genericType":"long","enumConstant":false,"accessible":false},{"name":"DEFAULT_CAPACITY","type":"int","modifiers":26,"annotations":[],"declaredAnnotations":[],"declaringClass":"java.util.ArrayList","synthetic":false,"genericType":"int","enumConstant":false,"accessible":false},{"name":"EMPTY_ELEMENTDATA","type":"[Ljava.lang.Object;","modifiers":26,"annotations":[],"declaredAnnotations":[],"declaringClass":"java.util.ArrayList","synthetic":false,"genericType":"[Ljava.lang.Object;","enumConstant":false,"accessible":false},{"name":"elementData","type":"[Ljava.lang.Object;","modifiers":130,"annotations":[],"declaredAnnotations":[],"declaringClass":"java.util.ArrayList","synthetic":false,"genericType":"[Ljava.lang.Object;","enumConstant":false,"accessible":false},{"name":"size","type":"int","modifiers":2,"annotations":[],"declaredAnnotations":[],"declaringClass":"java.util.ArrayList","synthetic":false,"genericType":"int","enumConstant":false,"accessible":false},{"name":"MAX_ARRAY_SIZE","type":"int","modifiers":26,"annotations":[],"declaredAnnotations":[],"declaringClass":"java.util.ArrayList","synthetic":false,"genericType":"int","enumConstant":false,"accessible":false}]
z []
getFilterCondition loop [obj1~String, obj2~integer, obj3~List<String>, obj4~boolean, obj5~boolean]
queryFilter final -
prinitng the filter objects -- [{"obj3":"one,two,three,four,five","obj4":true,"obj1":"String1","obj2":35}]
The final queryFilter to be sent will be as --
java.lang.NoSuchFieldException: obj1
at java.lang.Class.getDeclaredField(Class.java:1953)
at com.db.checklist.service.BPMServiceImpl.getFilterCondition(BPMServiceImpl.java:565)
at com.db.checklist.service.BPMServiceImpl.getGrid(BPMServiceImpl.java:335)
at com.db.checklist.controller.RestController.getGrid(RestController.java:90)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
[2015-10-17 20:39:48,973]:org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor-[DEBUG]: Written [[email protected]] as "application/json;charset=UTF-8" using [org.springfr[email protected]7e7642b3]
[2015-10-17 20:39:48,974]:org.springframework.web.servlet.DispatcherServlet-[DEBUG]: Null ModelAndView returned to DispatcherServlet with name 'bpm-service': assuming HandlerAdapter completed request handling
[2015-10-17 20:39:48,974]:org.springframework.web.servlet.FrameworkServlet-[DEBUG]: Successfully completed request
輸入是：`
[{"obj3":"one,two,three,four,five","obj4":true,"obj1":"String1","obj2":35}]
我不能讓「OBJ1的價值「」obj2「」obj3「」obj4「」obj5「...
我不是這方面的專家，但錯誤似乎不言自明。 –
我嘗試了谷歌和refletions站點的所有組合，但我無法破解它。任何幫助都是可以評估的 – KaMaL
你需要提供更多的代碼 - 一個片段是不夠的。具體來說，發生在例外行的情況以及指示該行是什麼將會非常有用 – tddmonkey