How can i get input type “date” value from html form into java variable and SQL date format?

Question

I tried to get the value of html input type "date" using request.getParameter() in servlet class, converted it into java date in JDBC Class, then to sql date format.

but there is this exception java.text.ParseException: Unparseable date.

This is the HTML tag for date

input type="date" name="BirthDate"

This is the servlet code to get value from HTML page

String bDate = request.getParameter("BirthDate");

This is the JDBC Class code to convert it

String bbd = user.getBDate();
DateFormat df = new SimpleDateFormat("dd/MM/yyy");
java.util.Date bbDate = df.parse(bbd);;
java.sql.Date bDate = new java.sql.Date(bbDate.getTime());

Answer 1

tl;dr

myPreparedStatement.setObject(                       // As of JDBC 4.2, pass java.time objects to your database.
    … ,
    LocalDate                                        // Represent a date-only value, without time-of-day and without time zone.
    .parse(                                          // Convert text to a `LocalDate` object.
        "23/01/2018" ,
        DateTimeFormatter.ofPattern( "dd/MM/uuuu" )  // Specify formatting pattern to match user input.
    )                                                // Returns a `LocalDate` object.
)

java.time

Use only java.time classes. Never use java.util.Date , java.sql.Date , Calendar , SimpleDateFormat , etc.

String input = "23/01/2018" ;
DateTimeFormatter f = DateTimeFormatter.ofPattern( "dd/MM/uuuu" ) ;
LocalDate ld = LocalDate.parse( input , f ) ;

As of JDBC 4.2, we can directly exchange java.time objects with the database.

myPreparedStatement.setObject( … , ld ) ;

Retrieval.

LocalDate ld = myResultSet.getObject( … , LocalDate.class ) ;

---

About java.time

The java.time framework is built into Java 8 and later. These classes supplant the troublesome old legacy date-time classes such as java.util.Date , Calendar , & SimpleDateFormat .

The Joda-Time project, now in maintenance mode , advises migration to the java.time classes.

To learn more, see the Oracle Tutorial . And search Stack Overflow for many examples and explanations. Specification is JSR 310 .

You may exchange java.time objects directly with your database. Use a JDBC driver compliant with JDBC 4.2 or later. No need for strings, no need for java.sql.* classes.

Where to obtain the java.time classes?

• Java SE 8 , Java SE 9 , Java SE 10 , Java SE 11 , and later - Part of the standard Java API with a bundled implementation.
  • Java 9 adds some minor features and fixes.
• Java SE 6 and Java SE 7
  • Most of the java.time functionality is back-ported to Java 6 & 7 in ThreeTen-Backport .
• Android
  • Later versions of Android bundle implementations of the java.time classes.
  • For earlier Android (<26), the ThreeTenABP project adapts ThreeTen-Backport (mentioned above). See How to use ThreeTenABP… .

The ThreeTen-Extra project extends java.time with additional classes. This project is a proving ground for possible future additions to java.time. You may find some useful classes here such as Interval , YearWeek , YearQuarter , and more .