Spring MVC Data Transformation

Example: Encapsulates a string and an object.
such as: Data zhangsan:1234 in Username:password format. We encapsulate this data as a user object. The following are implemented using the property editor and the converter, respectively.

1, you define the property editor A, write a property editor to inherit PropertyEditorSupport

 PackageCn.framelife.mvc.converter;ImportJava.beans.PropertyEditorSupport;ImportCn.framelife.mvc.entity.User; Public  class usereditor extends propertyeditorsupport {     Public void Setastext(String text)throwsillegalargumentexception {System.out.println ("Setastext"); User User =NewUser ();if(Text! =NULL) {string[] items = Text.split (":"); User.setusername (items[0]); User.setpassword (items[1]);    } setValue (user); }}

B, controller scope editor

Register with the controller and use the editor:

/** * @InitBinder Annotations bind the editor to the current controller */    @InitBinder     Public void Initbinder(Webdatabinder Binder) {//Register your own defined editorBinder.registercustomeditor (User.class,NewUsereditor ()); }/** * The first parameter user is a model data, the receiving page of the username with password * The second parameter converteruser through @requestparam annotations. Transfer the other parameters of the page to Usereditor to a user object * /    @RequestMapping("Create") PublicModelandviewCreateUser(User user,@Requestparam("Other") User converteruser) {System.out.println (User.getusername () +"--"+user.getpassword ()); System.out.println (Converteruser.getusername () +"--"+converteruser.getpassword ()); Modelandview view =NewModelandview (); View.setviewname ("/success");returnView }

C, Global-scope editor

Implement the Webbindinginitializer interface and register the property editor in the implementation class:

 PackageCn.framelife.mvc.converter;ImportOrg.springframework.web.bind.WebDataBinder;ImportOrg.springframework.web.bind.support.WebBindingInitializer;ImportOrg.springframework.web.context.request.WebRequest;ImportCn.framelife.mvc.entity.User; Public  class Mybindinginitializer implements Webbindinginitializer {     Public void Initbinder(Webdatabinder binder, WebRequest request) {//Register your own defined property editor. Here you can register multiple property editorsBinder.registercustomeditor (User.class,NewUsereditor ()); }}

To configure the Webbindinginitializer implementation class:

 <!--Configure global-scope property editor-->  Span class= "Hljs-tag" ><bean  class  = "Org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"  >  <property  name
      = "Webbindinginitializer" ;  <bean  class  = " Cn.framelife.mvc.converter.MyBindingInitializer ";  </ bean ;  </property
       >,  </bean ;   

Use the Property Editor:
is the same as in controller scope

    /**     * 第一个參数user是一个模型数据，接收页面的username用password     * 第二个參数converterUser通过@RequestParam注解，把页面的other參数交由UserEditor转成一个User对象      */    @RequestMapping("create")    publiccreateUser(User user,@RequestParam("other")User converterUser){        System.out.println(user.getUsername()+"--"+user.getPassword());        System.out.println(converterUser.getUsername()+"--"+converterUser.getPassword());        new ModelAndView();        view.setViewName("/success");        return view;    }

2, converter A, write a converter class inheritance converter

Package Cn.framelife.mvc.converter;import Org.springframework.core.convert.converter.converter;import Cn.framelife.mvc.entity.User;/** * converter<s Source Type/t target type > * * * Public  class stringtouserconverter implements Converter<String,  User> {     PublicUser convert (String source) {User user =NewUser ();if(Source! =NULL) {string[] items = Source.split (":"); User.setusername (items[0]); User.setpassword (items[1]); }returnUser }}

B, configuration (mvc-servlet.xml)

    <!--Assembly Converters --      <bean id= "conversionservice"class=" Org.springframework.context.support.ConversionServiceFactoryBean ">                 < property name="Converters">            <list>                <!--Here you can configure several of your own defined converters--                <Bean class="Cn.framelife.mvc.converter.StringToUserConverter"></Bean>            </list>        </Property >    </Bean>     <!--assemble your own defined converters--    <mvc:annotation-driven conversion-service="Conversionservice"/>

C, the Controller's processing method to receive page data

    /**     * 第一个參数user是一个模型数据，接收页面的username用password     * 第二个參数converterUser通过@RequestParam注解，把页面的other參数交由转换器StringTouserConverter转成一个User对象      */    @RequestMapping("create")    publiccreateUser(User user,@RequestParam("other")User converterUser){        System.out.println(user.getUsername()+"--"+user.getPassword());        System.out.println(converterUser.getUsername()+"--"+converterUser.getPassword());        new ModelAndView();        view.setViewName("/success");        return view;    }

3. Attention

Assuming that the controller scope's property editor, the global-scope property editor, and the converter exist at the same time, Spring MVC will look for the appropriate type of editor to handle in the following order of precedence:
Query the Controller Scope Property editor
Query Converters
Querying the global Scope property editor

4. Data Format 4.1 Spring built-in format converter

4.2 Use of annotation-driven formatting

A, start the annotation drive formatting function
Before we configured ourselves to define the converter. The Beanconversionservicefactorybean is used.

org.springframework.context.support.ConversionServiceFactoryBean

Change into

org.springframework.format.support.FormattingConversionServiceFactoryBean

The Formattingconversionservicefactorybean is able to register its own defined converters. You can also register your own defined annotation-driven format converter to enable the project to support annotation-driven formatting.

    <bean id= "conversionservice"class=" Org.springframework.format.support.FormattingConversionServiceFactoryBean ">                 < property name="Converters">            <list>                <!--This is the converter that was previously configured for its own definition--                <Bean class="Cn.framelife.mvc.converter.StringToUserConverter"></Bean>            </list>        </Property >    </Bean>

B, page

<form Action="User/create.abc" method="POST"> User name:<input type="text" name="username"><br/>Password<input type="text" name="password"><br/>Birthday:<input type="text" name="Birthday"><br/>Wages:<input type="text" name="Salary"><br/>Other:<input type="text" name="Other"><br/>        <input type="Submit"> </form>

C. Using formatted annotations in entity classes

 Public  class User implements Java. io. Serializable {    PrivateInteger ID;PrivateString username;PrivateString password;//Converts a string such as 1999-09-09 into a Date object    @DateTimeFormat(Pattern ="Yyyy-mm-dd")PrivateDate birthday;//Convert a string such as 5,500.00 to a long type of data    @NumberFormat(Pattern ="#,###.##")Private LongSalary Public Long getsalary() {returnSalary } Public void setsalary(LongSalary) { This. salary = salary; } PublicDateGetbirthday() {returnBirthday } Public void Setbirthday(Date birthday) { This. Birthday = Birthday; } PublicIntegergetId() {returnId } Public void setId(Integer ID) { This. id = ID; } PublicStringGetUserName() {returnUsername } Public void Setusername(String username) { This. Username = Username; } PublicStringGetPassword() {returnPassword } Public void SetPassword(String password) { This. Password = password; }}

D. Processing in Controler

    @RequestMapping("create")    publiccreateUser(User user){        System.out.println(user.getBirthday()+"=="+user.getSalary());        new ModelAndView();        view.setViewName("/success");        return view;    }

Spring MVC Data Transformation