spring mvc controller返回json出错解决

spring mvc 中写法

@RequestMapping(value = "/query")

@JsonSerialize(include=JsonSerialize.Inclusion.NON_NULL)

public @ResponseBody

JSONObject query(@RequestParam("startTime") String startTime,

@RequestParam("endTime") String endTime,

@RequestParam("oid") String oid, @RequestParam("cid") Integer cid,

@RequestParam("pay_channel") String payChannel,

@RequestParam("device_type") String deviceType,

@RequestParam("phone") Integer phone,

@RequestParam("perPage") Integer pageSize,

@RequestParam("skipIndex") Integer startIndex) throws Exception {

 

LogInfo info = populateQueryParam(startTime, endTime, oid, cid,

payChannel, deviceType, phone, pageSize, startIndex);

 

// 总记录数

Long totalCount = logMoniterService.queryLogInfoCount(info);

 

if (totalCount == null) {

totalCount = 0L;

}

 

List list = logMoniterService.queryLogInfo(info);

 

JSONObject retData = new JSONObject();

retData.put("success", true);

retData.put("data", list);

retData.put("error", "");

retData.put("totalRecords", totalCount);

return retData;

}

 

结果报错：

HTTP Status 500 - Could not write JSON: Object is null (through reference chain: net.sf.json.JSONObject["data"]->net.sf.json.JSONArray[0]->net.sf.json.JSONObject["createTime"]->net.sf.json.JSONNull["empty"]); nested exception is org.codehaus.jackson.map.JsonMappingException: Object is null (through reference chain: net.sf.json.JSONObject["data"]->net.sf.json.JSONArray[0]->net.sf.json.JSONObject["createTime"]->net.sf.json.JSONNull["empty"])

---

type Exception report

message Could not write JSON: Object is null (through reference chain: net.sf.json.JSONObject["data"]->net.sf.json.JSONArray[0]->net.sf.json.JSONObject["createTime"]->net.sf.json.JSONNull["empty"]); nested exception is org.codehaus.jackson.map.JsonMappingException: Object is null (through reference chain: net.sf.json.JSONObject["data"]->net.sf.json.JSONArray[0]->net.sf.json.JSONObject["createTime"]->net.sf.json.JSONNull["empty"])

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: Object is null (through reference chain: net.sf.json.JSONObject["data"]->net.sf.json.JSONArray[0]->net.sf.json.JSONObject["createTime"]->net.sf.json.JSONNull["empty"]); nested exception is org.codehaus.jackson.map.JsonMappingException: Object is null (through reference chain: net.sf.json.JSONObject["data"]->net.sf.json.JSONArray[0]->net.sf.json.JSONObject["createTime"]->net.sf.json.JSONNull["empty"])
 
   
org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.writeInternal(MappingJacksonHttpMessageConverter.java:203)
 
   
org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:179)
 
   
org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:148)
 
   
org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:90)
 
   
org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:189)
 
   
org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:69)
 
   
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:122)
 
   
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
 
   
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
 
   
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
 
   
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
 
   
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
 
   
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
 
   
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:838)
 
   
javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
 
   
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
 
   
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
 
   
org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
 
   
org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
 
   
org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
 
   
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
 
   
org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
 
   
org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
 
   
org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
 
   
org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
 
   
org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
 
   
org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
 
   
org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
 
   
org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
 
   
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:343)
 
   
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:260)
 
   
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
 
   
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
 
   

root cause

org.codehaus.jackson.map.JsonMappingException: Object is null (through reference chain: net.sf.json.JSONObject["data"]->net.sf.json.JSONArray[0]->net.sf.json.JSONObject["createTime"]->net.sf.json.JSONNull["empty"])
 
   
org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:218)
 
   
org.codehaus.jackson.map.JsonMappingException.wrapWithPath(JsonMappingException.java:183)
 
   
org.codehaus.jackson.map.ser.std.SerializerBase.wrapAndThrow(SerializerBase.java:140)
 
   
 
 
   
 
 
   
可能是json序列化的问题
 
   
代码修改为
 
   
@RequestMapping(value = "/query")
 
   
public @ResponseBody
 
   
Map query(@RequestParam("startTime") String startTime,
 
   
@RequestParam("endTime") String endTime,
 
   
@RequestParam("oid") String oid, @RequestParam("cid") Integer cid,
 
   
@RequestParam("pay_channel") String payChannel,
 
   
@RequestParam("device_type") String deviceType,
 
   
@RequestParam("phone") Integer phone,
 
   
@RequestParam("perPage") Integer pageSize,
 
   
@RequestParam("skipIndex") Integer startIndex) throws Exception {
 
   
 
 
   
LogInfo info = populateQueryParam(startTime, endTime, oid, cid,
 
   
payChannel, deviceType, phone, pageSize, startIndex);
 
   
 
 
   
// 总记录数
 
   
Long totalCount = logMoniterService.queryLogInfoCount(info);
 
   
 
 
   
if (totalCount == null) {
 
   
totalCount = 0L;
 
   
}
 
   
 
 
   
List list = logMoniterService.queryLogInfo(info);
 
   
 
 
   
Map result = new HashMap();
 
   
 
 
   
result.put("success", true);
 
   
result.put("data", list);
 
   
result.put("error", "");
 
   
result.put("totalRecords", totalCount);
 
   
return result;
 
   
}
 
   
 
 
   
问题解决