我得到了错误java.text.ParseException：Unparseable date

Question

我想日期格式为dd-MMM-yyyy。 我的代码是：

String v_date_str="Sun Mar 06 11:28:16 IST 2011"; 
     DateFormat formatter; 
     formatter = new SimpleDateFormat("dd-MMM-yyyy"); 
     Date date_temp=null; 
     try { 
      date_temp = (Date) formatter.parse(v_date_str); 
     } catch (ParseException ex) { 
      Logger.getLogger(Attendance_Calculation.class.getName()).log(Level.SEVERE, null, ex); 
     } 
     System.out.println("output: "+date_temp); 

但是，我得到了错误为：

The log message is null. 
java.text.ParseException: Unparseable date: "Sun Mar 06 11:28:16 IST 2011" 
     at java.text.DateFormat.parse(DateFormat.java:337) 
     at org.fes.pis.jsf.main.Attendance_Calculation.btn_show_pending_appl_action(Attendance_Calculation.java:415) 
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
     at java.lang.reflect.Method.invoke(Method.java:597) 
     at com.sun.el.parser.AstValue.invoke(AstValue.java:187) 
     at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297) 
     at com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:68) 
     at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:99) 
     at javax.faces.event.ActionEvent.processListener(ActionEvent.java:88) 
     at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:771) 
     at javax.faces.component.UICommand.broadcast(UICommand.java:372) 
     at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:475) 
     at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:756) 
     at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82) 
     at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100) 
     at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) 
     at com.sun.faces.extensions.avatar.lifecycle.PartialTraversalLifecycle.execute(PartialTraversalLifecycle.java:94) 
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:265) 
     at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427) 
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:315) 
     at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:287) 
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218) 
     at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648) 
     at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593) 
     at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94) 
     at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98) 
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222) 
     at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648) 
     at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593) 
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587) 
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093) 
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166) 
     at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648) 
     at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593) 
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587) 
     at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1093) 
     at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:291) 
     at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:666) 
     at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:597) 
     at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:872) 
     at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341) 
     at com.sun.enterprise.web.connector.grizzly.ssl.SSLReadTask.process(SSLReadTask.java:444) 
     at com.sun.enterprise.web.connector.grizzly.ssl.SSLReadTask.doTask(SSLReadTask.java:230) 
     at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:264) 
     at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106) 

感谢您的帮助....

但是，我想在日期格式为DD日期-MMM-YYYY。

Answer 1

您应该更改您的代码：

String v_date_str="Sun Mar 06 11:28:16 IST 2011"; 
DateFormat formatter; 
formatter = new SimpleDateFormat("EEE MMM d HH:mm:ss zzz yyyy"); 
Date date_temp=null; 
try { 
     date_temp = (Date) formatter.parse(v_date_str); 
    } catch (ParseException ex) { 
    Logger.getLogger(Attendance_Calculation.class.getName()).log(Level.SEVERE, null, ex); 
} 
System.out.println("output: "+date_temp); 

您使用了错误的日期格式解析日期。

Answer 2

使用此它将工作：

SimpleDateFormat formatter=new SimpleDateFormat("EEE MMM d HH:mm:ss zzz yyyy"); 

不能解析与被设置了不同的格式

Answer 3

在这段代码中你告诉Java中使用解析日期一个SimpleDateFormat日期给定的格式，然后打印它。因此您使用的格式字符串必须与输入日期字符串的格式匹配。既然没有，它不起作用也就不足为奇了。

要在两种不同格式之间转换日期，您可能需要使用两个不同的DateFormat对象，一个用于解析，一个用于打印。

Answer 4

试试下面的代码：

import java.text.DateFormat; 
import java.text.ParseException; 
import java.text.SimpleDateFormat; 
import java.util.Date; 
import java.util.Locale; 
import java.util.logging.Level; 
import java.util.logging.Logger; 


public class SimpleDateFormat02 { 

public static void main(String[] args) throws ParseException { 
    String v_date_str="Sun Mar 06 11:28:16 IST 2011"; 
    Date v_date = new SimpleDateFormat("EEE MMM dd HH:mm:ss zzz yyyy", Locale.ENGLISH).parse(v_date_str); 
    DateFormat formatter = null; 

    formatter = new SimpleDateFormat("dd-MMM-yyyy"); 
    Date date_temp=null; 
    try { 
     date_temp = (Date) formatter.parse("31-Dec-2012"); // String of same format a formatter 

    } catch (ParseException ex) { 
     //Logger.getLogger(Attendance_Calculation.class.getName()).log(Level.SEVERE, null, ex); 
     ex.printStackTrace(); 
    } 
    System.out.println("output: "+ formatter.format(v_date)); 
} 
} 

这个人给你所需要的输出！

Answer 5

我得到了解决方案，

String v_date_str = "Sun Mar 06 11:28:16 IST 2011"; 
    DateFormat formatter = new SimpleDateFormat("EEE MMM d HH:mm:ss zzz yyyy"); 
    String d_temp; 
    Date dTemp; 
    try { 
     dTemp = formatter.parse(v_date_str); 
     formatter=new SimpleDateFormat("dd-MMM-yyyy"); 
     d_temp=formatter.format(dTemp); 
     System.out.println("val : " + d_temp); 
    } catch (ParseException ex) { 
    } 

Answer 6

这工作得很好，我

的SimpleDateFormat格式1 =新的SimpleDateFormat（ “DD-MM-YYYY”）;

String formatted = format1.format（objectValue）;
Date javaDate = format1.parse（formatted）;