第四章、Spring学习-Controller接口控制器详解(6)

4.16、数据类型转换和数据验证

4.16.1、数据类型转换

IllegalArgumentException

package cn.javass.chapter4.model;
//省略import
public class DataBinderTestModel {
private String username;
private boolean bool;//Boolean值测试
private SchoolInfoModel schooInfo;
private List hobbyList;//集合测试，此处可以改为数组/Set进行测试
private Map map;//Map测试
private PhoneNumberModel phoneNumber;//String->自定义对象的转换测试
private Date date;//日期类型测试
private UserState state;//String——>Enum类型转换测试
//省略getter/setter
}

package cn.javass.chapter4.model;
//如格式010-12345678
public class PhoneNumberModel {
private String areaCode;//区号
private String phoneNumber;//电话号码
//省略getter/setter
}

package cn.javass.chapter4.web.controller.support.editor;
//省略import
public class PhoneNumberEditor extends PropertyEditorSupport {
Pattern pattern = Pattern.compile("^(\\d{3,4})-(\\d{7,8})$");
@Override
public void setAsText(String text) throws IllegalArgumentException {
if(text == null || !StringUtils.hasLength(text)) {
setValue(null); //如果没值，设值为null
}
Matcher matcher = pattern.matcher(text);
if(matcher.matches()) {
PhoneNumberModel phoneNumber = new PhoneNumberModel();
phoneNumber.setAreaCode(matcher.group(1));
phoneNumber.setPhoneNumber(matcher.group(2));
setValue(phoneNumber);
} else {
throw new IllegalArgumentException(String.format("类型转换失败，需要格式[010-12345678]，但格式是[%s]", text));
}
}
@Override
public String getAsText() {
PhoneNumberModel phoneNumber = ((PhoneNumberModel)getValue());
return phoneNumber == null ? "" : phoneNumber.getAreaCode() + "-" + phoneNumber.getPhoneNumber();
}
}

package cn.javass.chapter4.web.controller;
//省略import
public class DataBinderTestController extends AbstractCommandController {
public DataBinderTestController() {
setCommandClass(DataBinderTestModel.class); //设置命令对象
setCommandName("dataBinderTest");//设置命令对象的名字
}
@Override
protected ModelAndView handle(HttpServletRequest req, HttpServletResponse resp, Object command, BindException errors) throws Exception {
//输出command对象看看是否绑定正确
System.out.println(command);
return new ModelAndView("bindAndValidate/success").addObject("dataBinderTest", command);
}
@Override
protected void initBinder(HttpServletRequest request, ServletRequestDataBinder binder) throws Exception {
super.initBinder(request, binder);
//注册自定义的属性编辑器
//1、日期
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
CustomDateEditor dateEditor = new CustomDateEditor(df, true);
//表示如果命令对象有Date类型的属性，将使用该属性编辑器进行类型转换
binder.registerCustomEditor(Date.class, dateEditor);
//自定义的电话号码编辑器
binder.registerCustomEditor(PhoneNumberModel.class, new PhoneNumberEditor());
}
}

（4、spring配置文件chapter4-servlet.xml

<bean name="/dataBind"
class="cn.javass.chapter4.web.controller.DataBinderTestController"/>

EL phoneNumber:${dataBinderTest.phoneNumber}<br/>
EL state:${dataBinderTest.state}<br/>
EL date:${dataBinderTest.date}<br/>

WebBindingInitializer批量注册

package cn.javass.chapter4.web.controller.support.initializer;
//省略import
public class MyWebBindingInitializer implements WebBindingInitializer {
@Override
public void initBinder(WebDataBinder binder, WebRequest request) {
//注册自定义的属性编辑器
//1、日期
DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
CustomDateEditor dateEditor = new CustomDateEditor(df, true);
//表示如果命令对象有Date类型的属性，将使用该属性编辑器进行类型转换
binder.registerCustomEditor(Date.class, dateEditor);
//自定义的电话号码编辑器
binder.registerCustomEditor(PhoneNumberModel.class, new PhoneNumberEditor());
}
}

<!-- 注册WebBindingInitializer实现 -->
<bean id="myWebBindingInitializer" class="cn.javass.chapter4.web.controller.support.initializer.MyWebBindingInitializer"/>
<bean name="/dataBind" class="cn.javass.chapter4.web.controller.DataBinderTestController">
<!-- 注入WebBindingInitializer实现 -->
<property name="webBindingInitializer" ref="myWebBindingInitializer"/>
</bean>

Conversion）支持，它可以在任意对象之间进行类型转换，不仅仅是String

——>Object。

WebBindingInitializer批量注册