我收到 java.util.List<Object[]>
通过 JSON-rpc 作为 JavaScript 数组,如下所示。
[
[1, 0.10, 1.00],
[2, 0.20, 2.00],
[3, 0.30, 3.00],
[4, 0.40, 4.00],
[5, 0.50, 5.00],
[6, 0.60, 6.00],
[7, 0.70, 7.00],
[8, 0.80, 8.00],
[9, 0.90, 9.00],
[10, 1.00, 10.00],
[11, 1.10, 11.00],
[12, 1.20, 12.00],
[13, 1.30, 13.00],
[14, 1.40, 14.00],
[15, 1.50, 15.00],
[16, 1.60, 16.00],
[17, 1.70, 17.00],
[18, 1.80, 18.00]
]
我需要将这个相同的数组传递回服务器(在最后一个维度进行一些修改)。
我使用以下函数发回该数组。
var request;
var timeout;
var itemsArray=[];
function insert()
{
if(!request)
{
var i=0;
$('input[name="txtCharge[]"]').each(function()
{
isNaN($(this).val())||$(this).val()===''?itemsArray[i][2]='':itemsArray[i][2]=eval(eval($(this).val()).toFixed(2));
i++;
});
request = $.ajax({
dataType:"json",
type: "POST",
data: JSON.stringify({jsonrpc:'2.0', method:'insertZoneCharges', id:'jsonrpc', params:[itemsArray]}),
contentType: "application/json-rpc; charset=utf-8",
url: "AddZoneChargeList",
success: function(response)
{
alert(response.result);
},
complete: function()
{
timeout = request = null;
},
error: function(request, status, error)
{
if(status!=="timeout"&&status!=="abort")
{
alert(status+" : "+error);
}
}
});
timeout2 = setTimeout(function() {
if(request)
{
request.abort();
alert("The request has been timed out.");
}
}, 300000);
}
}
数组的结构itemsArray
循环之后与第一个片段中提到的完全相同。
该 jQuery 函数调用的方法如下。
@Namespace("/admin_side")
@ResultPath("/WEB-INF/content")
@ParentPackage(value="json-default")
public final class ZoneCharge extends ActionSupport implements Serializable
{
private static final long serialVersionUID = 1L;
public ZoneCharge() {}
//This method is invoked by the given jQuery function.
//It should accept the array as a parameter of type List<Object[]> but it doesn't.
@SMDMethod
public String insertZoneCharges(@SMDMethodParameter(name="list")List<Object[]> list)
{
for(Object[]o:list)
{
System.out.println(o[0]+" : "+o[1]+" : "+o[2]);
}
return "The action completed successfully.";
}
@Action(value = "AddZoneChargeList",
results = {
@Result(name = ActionSupport.SUCCESS, type = "json", params = {"enableSMD", "true"})},
interceptorRefs = {
@InterceptorRef(value = "json", params = {"enableSMD", "true"})})
public String insertAction() throws Exception {
return ActionSupport.SUCCESS;
}
}
当尝试发出请求时,会导致抛出以下异常。
Feb 19, 2014 6:14:00 AM org.apache.struts2.json.rpc.RPCError error
SEVERE: Incompatible types for property insertZoneCharges
org.apache.struts2.json.JSONException: Incompatible types for property insertZoneCharges
at org.apache.struts2.json.JSONPopulator.convertToCollection(JSONPopulator.java:254)
at org.apache.struts2.json.JSONPopulator.convert(JSONPopulator.java:131)
at org.apache.struts2.json.JSONInterceptor.invoke(JSONInterceptor.java:242)
at org.apache.struts2.json.JSONInterceptor.intercept(JSONInterceptor.java:133)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:562)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at filter.NoCacheFilter.doFilter(NoCacheFilter.java:25)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
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.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:105)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
at org.springframework.security.web.FilterChainProxy$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:108)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.session.ConcurrentSessionFilter.doFilter(ConcurrentSessionFilter.java:125)
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.access.channel.ChannelProcessingFilter.doFilter(ChannelProcessingFilter.java:144)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.web.multipart.support.MultipartFilter.doFilterInternal(MultipartFilter.java:119)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1822)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)
为什么该数组没有映射到 List<Object[]>
,当相同时List<Object[]>
在接收来自服务器的响应时是否正确映射到数组(这是通过一个单独的 jQuery 函数完成的,该函数未在本问题中涉及)?
编辑1:
下面一行,
data: JSON.stringify({jsonrpc:'2.0', method:'insertZoneCharges', id:'jsonrpc', params:[itemsArray]})
给定的 jQuery 函数对应于以下字符串。
{
"jsonrpc": "2.0",
"method": "insertZoneCharges",
"id": "jsonrpc",
"params": [
[
[1, 0.1, 1],
[2, 0.2, 2],
[3, 0.3, 3],
[4, 0.4, 4],
[5, 0.5, 5],
[6, 0.6, 6],
[7, 0.7, 7],
[8, 0.8, 8],
[9, 0.9, 9],
[10, 1, 10],
[11, 1.1, 11],
[12, 1.2, 12],
[13, 1.3, 13],
[14, 1.4, 14],
[15, 1.5, 15],
[16, 1.6, 16],
[17, 1.7, 17],
[18, 1.8, 18]
]
]
}
这看起来有效,应该正确映射到 java.util.List<Object[]>
不会引起异常。
编辑2:
当删除泛型类型参数时,此方法有效,列表只是 List
(而不是 <List<Object[]>>
)或者参数的类型为 List<List<Object>>
。比如,
@SMDMethod
public String insertZoneCharges(@SMDMethodParameter(name="list")List<List<Object>> list)
{
for(List<Object> o:list)
{
System.out.println(o);
}
return "The action completed successfully.";
}
循环显示以下输出。
[1, 0.1, 1]
[2, 0.2, 2]
[3, 0.3, 3]
[4, 0.4, 4]
[5, 0.5, 5]
[6, 0.6, 6]
[7, 0.7, 7]
[8, 0.8, 8]
[9, 0.9, 9]
[10, 1, 10]
[11, 1.1, 11]
[12, 1.2, 12]
[13, 1.3, 13]
[14, 1.4, 14]
[15, 1.5, 15]
[16, 1.6, 16]
[17, 1.7, 17]
[18, 1.8, 18]
查看输出,JSON 数组应正确映射到 List<Object[]>
但这并没有发生。
编辑 3:(不是实质性编辑)。
虽然实际的数组在给定的 jQuery 函数中是不可见的,但这可以简单地通过以下 jQuery 函数重现。
function insert()
{
var a=[[1, 2], [3, 4]]; //Array.
$.ajax({
dataType:"json",
type: "POST",
data: JSON.stringify({jsonrpc:'2.0', method:'insertZoneCharges', id:'jsonrpc', params:[a]}),
contentType: "application/json-rpc; charset=utf-8",
url: "AddZoneChargeList",
success: function(response)
{
alert(response.result);
},
complete: function()
{
//Do something.
},
error: function(request, status, error)
{
//Do something.
}
});
}
}
SMD方法的预期方法参数可能是 java.util.List<Object[]>
或java.util.List<Long[]>
。无论哪种情况,都会失败并给出异常。
还剩下最后一件事。如果存在像(在 JavaScript 中)这样的一维数组,
var a=[1, 2];
那么这将正确映射到 Long[]
(以及 Object[]
)作为 SMD 方法参数。
所以,现在我不知道该去哪里寻找了。
最佳答案
使用来源,卢克。如果您查看抛出该异常的类,您会发现它不支持 List<anything[]>
。相关行来自org.apache.struts2.json.JSONPopulator.convertToCollection()
:
232 // create an object for each element
233 for (int j = 0; j < values.size(); j++) {
234 Object listValue = values.get(j);
235
236 if (itemClass.equals(Object.class)) {
237 // Object[]
238 newCollection.add(listValue);
239 } else if (isJSONPrimitive(itemClass)) {
240 // primitive array
241 newCollection.add(this.convertPrimitive(itemClass, listValue, accessor));
242 } else if (Map.class.isAssignableFrom(itemClass)) {
243 Object newObject = convertToMap(itemClass, itemType, listValue, accessor);
244 newCollection.add(newObject);
245 } else if (List.class.isAssignableFrom(itemClass)) {
246 Object newObject = convertToCollection(itemClass, itemType, listValue, accessor);
247 newCollection.add(newObject);
248 } else if (listValue instanceof Map) {
249 // array of beans
250 Object newObject = itemClass.newInstance();
251 this.populateObject(newObject, (Map) listValue);
252 newCollection.add(newObject);
253 } else
254 throw new JSONException("Incompatible types for property " + accessor.getName());
255 }
此代码将项目添加到列表中,并在决定如何从数据实例化对象之前进行一系列类型检查。第 237 行的注释具有误导性;它似乎是从 convertToArray
复制并粘贴的;它所做的只是将当前的 listValue 添加到列表中。同样,第 249 行有关数组的注释也没有创建数组。事实上,这里没有处理数组的代码,所以它直接跳到第 254 行并抛出您看到的异常。该代码似乎缺少几行,如下所示:
else if (itemClass.isArray()) {
Object newObject = convertToArray(itemClass, itemType, listValue, method);
newCollection.add(newObject);
...直接从 convert()
中的代码进行翻译用于处理一维数组 - 正如您所注意到的,它可以工作。您必须询问 struts 开发人员这是疏忽还是故意的。看来您确实陷入了集合的集合中。
关于jquery - org.apache.struts2.json.JSONException : Incompatible types for property,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21868965/