解析JSON數組的GSON問題

Question

這是我的問題。我正在嘗試將此json反序列化爲字符串數組。這裏是我的JSON

[{"productId":"primary_savings","productName":"Primary Savings - Required Membership Account","productAmount":"0","isForFunding":"true"}] 

這裏是我的代碼

List<String> list1 = Arrays.asList(gson.fromJson(array1, String[].class)); 

，這裏是我的堆棧跟蹤

java.lang.UnsupportedOperationException: null 
at com.google.gson.JsonElement.getAsString(JsonElement.java:184) 
at com.google.gson.DefaultTypeAdapters$StringTypeAdapter.deserialize(DefaultTypeAdapters.java:968) 
at com.google.gson.DefaultTypeAdapters$StringTypeAdapter.deserialize(DefaultTypeAdapters.java:960) 
at com.google.gson.JsonDeserializerExceptionWrapper.deserialize(JsonDeserializerExceptionWrapper.java:51) 
at com.google.gson.JsonDeserializationVisitor.invokeCustomDeserializer(JsonDeserializationVisitor.java:92) 
at com.google.gson.JsonDeserializationVisitor.visitUsingCustomHandler(JsonDeserializationVisitor.java:80) 
at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:101) 
at com.google.gson.JsonDeserializationVisitor.visitChild(JsonDeserializationVisitor.java:110) 
at com.google.gson.JsonDeserializationVisitor.visitChildAsObject(JsonDeserializationVisitor.java:99) 
at com.google.gson.JsonArrayDeserializationVisitor.visitArray(JsonArrayDeserializationVisitor.java:70) 
at com.google.gson.ObjectNavigator.accept(ObjectNavigator.java:112) 
at com.google.gson.JsonDeserializationContextDefault.fromJsonArray(JsonDeserializationContextDefault.java:67) 
at com.google.gson.JsonDeserializationContextDefault.deserialize(JsonDeserializationContextDefault.java:52) 
at com.google.gson.Gson.fromJson(Gson.java:551) 
at com.google.gson.Gson.fromJson(Gson.java:498) 
at com.google.gson.Gson.fromJson(Gson.java:467) 
at com.google.gson.Gson.fromJson(Gson.java:417) 
at com.google.gson.Gson.fromJson(Gson.java:389) 
at com.msp.acct.util.UnstructuredVarsUtil.mergeJsonArrays(UnstructuredVarsUtil.java:178) 
at com.msp.acct.util.UnstructuredVarsUtil.mergeJsonObjects(UnstructuredVarsUtil.java:105) 
at com.msp.acct.util.UnstructuredVarsUtil.mergeJsonObjects(UnstructuredVarsUtil.java:77) 
at com.msp.acct.data.Persist.updateApplicantUnstructuredVars(Persist.java:1628) 
at com.msp.acct.risk.dynamic.integrations.lending360.Lending360.appendPropertyToUnstructuredVars(Lending360.java:817) 
at com.msp.acct.risk.dynamic.integrations.lending360.Lending360.checkExistingMember(Lending360.java:168) 
at com.msp.acct.risk.dynamic.DynamicRiskEngine.checkExistingMember(DynamicRiskEngine.java:302) 
at com.msp.acct.svc.ApplicantController.checkExistingMember(ApplicantController.java:360) 
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.doInvoke(InvocableHandlerMethod.java:221) 
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137) 
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:747) 
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:676) 
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) 
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:644) 
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837) 
at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:301) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330) 
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118) 
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.authentication.www.DigestAuthenticationFilter.doFilter(DigestAuthenticationFilter.java:115) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:57) 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50) 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342) 
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192) 
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77) 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
at com.msp.acct.svc.CORSFilter.doFilter(CORSFilter.java:83) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) 
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) 
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) 
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) 
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:503) 
at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:676) 
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:136) 
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:74) 
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) 
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:516) 
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1015) 
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:652) 
at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222) 
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1575) 
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1533) 
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) 

什麼我錯在這裏做什麼？我見過其他的stackoverflow問題，但他們都沒有解決我的問題。

請協助如下

Answer 1

使用類型：

Type listType = new TypeToken<List<String>>() {}.getType(); 
List<String> yourList = gson.fromJson(array1, listType); 

GSON API documentation

Answer 2

這裏的問題是：輸入是不是字符串數組：它是一個包含有一個對象的數組字符串值。你必須反覆提取字符串或創建一個類映射對象，像：

class Product { 
    String productName; 
    String productId; 
    String productAmount; 
    String isForFunding; 
} 

然後

Product[] product = gson.fromJson(array1, Product[].class)