java中Date转换成JSON出错如何解决？

    
  PrintWriter printWriter;
  

  try {
  

  printWriter = getResponse().getWriter();
  

  printWriter.write(JSONArray.fromObject(dutyList).toString());
  

  printWriter.close();
  

  } catch (IOException e) {
  

  // TODO Auto-generated catch block
  

  }

以上代码是让dutyList中的数据转换成JSON数据格式用于前台JS，其中有Date数据类型无法转换。出现错误，以下是控制台错误信息，可能我描述的问题不够清楚，是因为本人技术有限，希望了解的人帮忙解答，谢谢。

2012-07-25 17:18:47,958 ERROR
[DutyListInitOrSelectAction]
net.sf.json.JSONException:
java.lang.reflect.InvocationTargetException
at net.sf.json.JSONObject._fromBean(JSONObject.java:738)
at net.sf.json.JSONObject.fromObject(JSONObject.java:182)
at net.sf.json.JSONObject._processValue(JSONObject.java:2426)
at net.sf.json.JSONObject._setInternal(JSONObject.java:2447)
at net.sf.json.JSONObject.setValue(JSONObject.java:1189)
at net.sf.json.JSONObject._fromBean(JSONObject.java:725)
at net.sf.json.JSONObject.fromObject(JSONObject.java:182)
at net.sf.json.JSONArray._processValue(JSONArray.java:2294)
at net.sf.json.JSONArray.processValue(JSONArray.java:2325)
at net.sf.json.JSONArray.addValue(JSONArray.java:2312)
at net.sf.json.JSONArray._fromCollection(JSONArray.java:841)
at net.sf.json.JSONArray.fromObject(JSONArray.java:137)
at net.sf.json.JSONArray.fromObject(JSONArray.java:120)
at com.gage.oa.personaloffice.duty.action.DutyListInitOrSelectAction.executeBussiness(DutyListInitOrSelectAction.java:154)
at com.gage.fw.web.action.BaseGageAction.execute(BaseGageAction.java:225)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown
Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown
Source)
at java.lang.reflect.Method.invoke(Unknown
Source)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:270)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at com.gage.fw.aop.AuthLoginInterceptor.intercept(AuthLoginInterceptor.java:64)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:498)
at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
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:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:291)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)
Caused by:
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown
Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown
Source)
at java.lang.reflect.Method.invoke(Unknown
Source)
at org.apache.commons.beanutils.PropertyUtilsBean.invokeMethod(PropertyUtilsBean.java:1773)
at org.apache.commons.beanutils.PropertyUtilsBean.getSimpleProperty(PropertyUtilsBean.java:1132)
at org.apache.commons.beanutils.PropertyUtilsBean.getNestedProperty(PropertyUtilsBean.java:686)
at org.apache.commons.beanutils.PropertyUtilsBean.getProperty(PropertyUtilsBean.java:715)
at org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.java:290)
at net.sf.json.JSONObject._fromBean(JSONObject.java:713)
... 89 more Caused by: java.lang.IllegalArgumentException
at java.sql.Time.getDate(Unknown Source)
... 99 more

java


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xiao@W 12 years, 10 months ago

Answers

可以自己写一个JsonValueProcessor实现类来实现JsonValueProcessor接口，实现processArrayValue方法和processObjectValue方法，具体我的代码如下，你参考一下：

    
  import java.text.SimpleDateFormat;
  

  import java.util.Date;
  

  

  import net.sf.json.JsonConfig;
  

  import net.sf.json.processors.JsonValueProcessor;
  

  

  public class JsonValueProcessorImpl implements JsonValueProcessor {
  

  

  private String format = "yyyy-MM-dd";
  

  

  public JsonValueProcessorImpl() {
  

  

  }
  

  

  public JsonValueProcessorImpl(String format) {
  

  this.format = format;
  

  }
  

  

  public Object processArrayValue(Object value, JsonConfig jsonConfig) {
  

  String[] obj = {};
  

  if (value instanceof Date[]) {
  

  SimpleDateFormat sf = new SimpleDateFormat(format);
  

  Date[] dates = (Date[]) value;
  

  obj = new String[dates.length];
  

  for (int i = 0; i < dates.length; i++) {
  

  obj[i] = sf.format(dates[i]);
  

  }
  

  }
  

  return obj;
  

  }
  

  

  public Object processObjectValue(String key, Object value,
  

  JsonConfig jsonConfig) {
  

  if (value instanceof Date) {
  

  String str = new SimpleDateFormat(format).format((Date) value);
  

  return str;
  

  }
  

  if(null != value){
  

  return value.toString();
  

  }
  

  return "";
  

  }
  

  

  public String getFormat() {
  

  return format;
  

  }
  

  

  public void setFormat(String format) {
  

  this.format = format;
  

  }
  

  }

然后定义一个JsonConfig，设置JsonConfig的相应属性：

    
  JsonConfig config = new JsonConfig();
  

  //保证cglib动态生成的Bean不被序列化
  

  config.setExcludes(new String[]{"handler","hibernateLazyInitializer"});
  

  config.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);
  

  config.registerJsonValueProcessor(java.util.Date.class, new JsonValueProcessorImpl());

重点是最后一个，其他的是我原来的代码，
转换的时候这么用：

    
  JSONArray.fromObject(dutyList,config);

希望能给你帮助吧..


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rained answered 12 years, 10 months ago

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