To convert a string to a date type by using the Beanutils setting property

1 when setting properties using Beanutils, the String,int can be converted automatically. such as the following example

Define a person class first

Package pkg6;import Java.util.date;import Java.text.SimpleDateFormat; Public classPerson {PrivateString name; PrivateString Gender; Private intAge ; PrivateDate birthday;  PublicPerson () {} PublicString GetName () {returnname; }     Public voidsetName (String name) { This. Name =name; }     PublicString Getgender () {returngender; }     Public voidSetgender (String gender) { This. Gender =gender; }     Public intGetage () {returnAge ; }     Public voidSetage (intAge ) {         This. Age =Age ; }     PublicDate Getbirthday () {returnbirthday; }     Public voidsetbirthday (Date birthday) { This. Birthday =birthday; } @Override PublicString toString () {return ' {name: ' +name+ ' Age: ' +age+ ' Birthday: ' +birthday+ '} ';    }}

Use a function to test

Package Pkg6;import Java.lang.reflect.invocationtargetexception;import org.apache.commons.beanutils.BeanUtils ; Public classDemo1 { Public Static voidMain (string[] args) {//TODO auto-generated Method Stubperson P1 =NewPerson (); String name="Eric"; String Gender="M"; intAge = A; String Birthday="1991-32-56"; Try{Beanutils.setproperty (P1,"name","Eric"); //Beanutils.setproperty (P1, "Birthday", birthday);                    } Catch(Exception e) {//TODO auto-generated Catch blockE.printstacktrace (); } System. out. println (p1); }}

Its output is

{Name:eric age:0 Birthday:null}

No problem. In the Web development process often encounter Web page submission user data is a string, the data stored in the database is a date, then directly set up what happens, as follows

After the code that sets the property, add

Beanutils.setproperty (P1, "Birthday", birthday);

Operation results will be error-

Org.apache.commons.beanutils.ConversionException:String must bes in JDBC format [YYYY-MM-DD] to create a java.sql.Date
At Org.apache.commons.beanutils.converters.DateTimeConverter.toDate (datetimeconverter.java:436)
At Org.apache.commons.beanutils.converters.DateTimeConverter.convertToType (datetimeconverter.java:343)
At Org.apache.commons.beanutils.converters.AbstractConverter.convert (abstractconverter.java:156) {name:eric age:0 Birthday:null}

This is because Beanutils does not support the conversion of strings to other object types. To convert, you need to register a converter.

Convertutils.register (NewConverter () { PublicObject Convert (Class type, Object value) {SimpleDateFormat simpleDate Format=NewSimpleDateFormat ("YYYY-MM-DD"); Try {                    returnSimpledateformat.parse (value.tostring ()); } Catch(ParseException e) {//TODO auto-generated Catch blockE.printstacktrace (); }                return NULL; }}, Date.class);

When the Java.util.Date type is encountered, the converter is used to convert the string to the date type.

The complete code is as follows:

Package Pkg6;import Java.lang.reflect.invocationtargetexception;import java.text.parseexception;import Java.text.simpledateformat;import Java.util.date;import Org.apache.commons.beanutils.beanutils;import Org.apache.commons.beanutils.convertutils;import Org.apache.commons.beanutils.Converter; Public classDemo1 { Public Static voidMain (string[] args) {//TODO auto-generated Method Stubperson P1 =NewPerson (); String name="Eric"; String Gender="M"; intAge = A; String Birthday="1991-32-56"; Convertutils.register (NewConverter () { PublicObject Convert (Class type, Object value) {SimpleDateFormat simpleDate Format=NewSimpleDateFormat ("YYYY-MM-DD"); Try {                    returnSimpledateformat.parse (value.tostring ()); } Catch(ParseException e) {//TODO auto-generated Catch blockE.printstacktrace (); }                return NULL; }}, Date.class); Try{Beanutils.setproperty (P1,"name","Eric"); Beanutils.setproperty (P1,"Birthday", birthday); } Catch(Exception e) {//TODO auto-generated Catch blockE.printstacktrace (); } System. out. println (p1); }}

The results of the operation are as follows:

{name:eric age:0 Birthday:sat Sep 00:00:00 CST 1993}

To convert a string to a date type by using the Beanutils setting property