Question

我希望日期格式为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，我得到的错误是：

    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，我希望日期格式的日期为dd-MMM-yyyy。

Answer 1

使用它可以工作：

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

您无法解析使用其他格式

设置的SimpleDateFormat的日期

Answer 2

您应该将代码更改为：

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);

您使用错误的日期格式来解析日期。

Answer 3

在此代码中，您告诉Java使用给定格式解析日期，然后将其打印出来。因此，您使用的格式字符串必须与输入日期字符串的格式相匹配。既然它没有，它就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，您可能希望使用两个不同的DateFormat对象，一个用于解析，另一个用于打印。

Answer 4

请尝试以下代码：

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));
}
}

这个给你想要的输出！

Answer 5

这对我很有用

SimpleDateFormat format1 = new SimpleDateFormat（“dd-MM-yyyy”）;

String formatted = format1.format（objectValue）;
日期javaDate = format1.parse（格式化）;

Answer 6

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) {
    }

我收到错误java.text.ParseException：Unparseable date

6 个答案: