Java中如何將String轉成Date

Java中如何將String轉成Date

最近在開發Json數據反序列化爲Java對象的時候發現spring mvc 和 Jackson 對Date類型對支持不是特別好，雖然在Java對象序列化爲Json數據的過程當中提供了便利的註解，可是反序列化卻沒有，因而就引出了下面的問題，我須要手工的將字符串轉換爲Date類型的數據，java.text.SimpleDateFormat 爲咱們提供了這種轉換的基礎設施。以下列出了的格式化模式的簡單定義，若是 ‘M’ 大於等於3位, 月份會顯示爲字母，不然是數字. 更詳細的定義請參考 java.text.SimpleDateFormat JavaDoc。

 

 

Letter    Description        Examples
y        Year                2015
M        Month in year        Nov, 11, 7
d        Day in month        1-31
E        Day name in week    Friday, Sunday
a        Am/pm marker        AM, PM
H        Hour in day            0-23
h        Hour in am/pm        1-12
m        Minute in hour        0-60
s        Second in minute    0-60
    

 

1. Date = 7-Nov-2015

    SimpleDateFormat formatter = new SimpleDateFormat("dd-MMM-yyyy");
    String dateInString = "7-Nov-2015";

    try {

        Date date = formatter.parse(dateInString);
        System.out.println(date);
        System.out.println(formatter.format(date));

    } catch (ParseException e) {
        e.printStackTrace();
    }
    
Output

Mon Nov 07 00:00:00 MYT 2015
07-Nov-2015


2. Date = 07/06/2015

    SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
    String dateInString = "07/06/2015";

    try {

        Date date = formatter.parse(dateInString);
        System.out.println(date);
        System.out.println(formatter.format(date));

    } catch (ParseException e) {
        e.printStackTrace();
    }
    
Output
Mon Nov 07 00:00:00 MYT 2015
07/06/2015


3. Date = Nov 7, 2015

    SimpleDateFormat formatter = new SimpleDateFormat("MMM dd, yyyy");
    String dateInString = "Nov 7, 2015";        

    try {

        Date date = formatter.parse(dateInString);
        System.out.println(date);
        System.out.println(formatter.format(date));

    } catch (ParseException e) {
        e.printStackTrace();
    }
Output

Mon Nov 07 00:00:00 MYT 2015
Nov 07, 2015

4. Date = Fri, Nov 7 2015

    SimpleDateFormat formatter = new SimpleDateFormat("E, MMM dd yyyy");
    String dateInString = "Fri, Nov 7 2015";        
        
    try {

        Date date = formatter.parse(dateInString);
        System.out.println(date);
        System.out.println(formatter.format(date));

    } catch (ParseException e) {
        e.printStackTrace();
    }
    
Output
Mon Nov 07 00:00:00 MYT 2015
Mon, Nov 07 2015

 
2. Date and Time Example
1. Date and Time = Friday, Nov 7, 2015 12:10:56 PM

    SimpleDateFormat formatter = new SimpleDateFormat("EEEE, MMM dd, yyyy HH:mm:ss a");
    String dateInString = "Friday, Nov 7, 2015 12:10:56 PM";        
        
    try {

        Date date = formatter.parse(dateInString);
        System.out.println(date);
        System.out.println(formatter.format(date));

    } catch (ParseException e) {
        e.printStackTrace();
    }
    
Output
Mon Nov 07 12:10:56 MYT 2015
Monday, Nov 07, 2015 12:10:56 PM

總結
本文簡單的總結了將字符串轉換爲Java對象的主流方法，但願對你們有所幫助。