Spring MVC parameter Type conversions

The implementation is illustrated by the example of a string to date:

Global configuration First: implementing the Converter Interface

• Implementation class:
  public class Stringtodateconveter implements Converter {

      private String formatPatten;    public StringToDateConveter(String formatPatten){        this.formatPatten=formatPatten;    }    @Override    public Date convert(String s) {        return DateUtil.string2Date(s,formatPatten);    }}

• Mvc.xml configuration

    <mvc:annotation-driven conversion-service= "Conversionservice" ></MVC: Annotation-driven><bean id= "Conversionservice" class= " Org.springframework.format.support.FormattingConversionServiceFactoryBean "> <property name=" Converters "                > <set> <bean class= "Com.lannong.api.www.converter.StringToDateConveter" > <constructor-arg name= "Formatpatten" value= "Yyyy-mm-dd"/> </bean> </set> </prope Rty></bean>  

• Configure to Handleradapter

     <!--使用 ConfigurableWebBindingInitializer 注册conversionService-->   <bean id="webBindingInitializer" class="org.springframework.web.bind.support.ConfigurableWebBindingInitializer">        <property name="conversionService" ref="conversionService"/>   </bean>   <!-- 注册ConfigurableWebBindingInitializer 到RequestMappingHandlerAdapter-->   <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">        <property name="webBindingInitializer" ref="webBindingInitializer"/>   </bean>

The second kind: Implement the Formatter interface, similar to the first implementation method

• Implementation class

  public class MyDateFormater implements Formatter<Date> {    @Override    public Date parse(String s, Locale locale) throws ParseException {        return DateTimeUtil.string2Date(s,"yyyy-MM-dd");    }    @Override    public String print(Date date, Locale locale) {        return null;    }}

• Mvc.xml Configuration

  <mvc:annotation-driven conversion-service="conversionService"></mvc:annotation-driven><bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">    <property name="formatters">        <set>            <bean class="com.lannong.api.www.converter.MyDateFormater"/>        </set>    </property></bean>

The third type: Implement Webbindinginitializer interface

• Implementation class

  public class MyWebBindingInitializer implements WebBindingInitializer {    @Override    public void initBinder(WebDataBinder binder, WebRequest request) {        binder.registerCustomEditor(Date.class, new PropertyEditorSupport() {            @Override            public void setAsText(String text) {                setValue(DateTimeUtil.string2Date(text, "yyyy-MM-dd"));            }        });    }}

• Mvc.xml Configuration

  <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">    <property name="webBindingInitializer">        <bean class="com.lannong.api.www.binder.MyWebBindingInitializer"/>    </property>    <!-- others config --></bean>

Local configuration Add the conversion method to the controller and add the @initbinder

• Code

  @InitBinderpublic void initBinder(WebDataBinder webDataBinder) throws Exception{    SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd hh:mm");    simpleDateFormat.setLenient(false);    webDataBinder.registerCustomEditor(Date.class , new CustomDateEditor(simpleDateFormat , true));}或@InitBinderpublic void initBinder(WebDataBinder binder, WebRequest request) {    binder.registerCustomEditor(Date.class, new PropertyEditorSupport() {        @Override        public void setAsText(String text) {            setValue(DateTimeUtil.string2Date(text, "yyyy-MM-dd"));        }    });}

Both ways are possible, and the scope is the same as that of the method scope

Use @datetimeformat (pattern = "YYYY-MM-DD")

Annotations can be added to attributes, or they can be added to a method and need to be imported into Joda-time.jar. In addition, the format of the date parameter needs to be consistent with the Patten definition, otherwise 400 error will be reported

Spring MVC parameter Type conversions