数据绑定

public class Company {

	private String name;
	private Employee managingDirector;

	public String getName() {
		return this.name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Employee getManagingDirector() {
		return this.managingDirector;
	}

	public void setManagingDirector(Employee managingDirector) {
		this.managingDirector = managingDirector;
	}
}

public class Employee {

	private String name;

	private float salary;

	public String getName() {
		return this.name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public float getSalary() {
		return salary;
	}

	public void setSalary(float salary) {
		this.salary = salary;
	}
}

BeanWrapper company = new BeanWrapperImpl(new Company());
// setting the company name..
company.setPropertyValue("name", "Some Company Inc.");
// ... can also be done like this:
PropertyValue value = new PropertyValue("name", "Some Company Inc.");
company.setPropertyValue(value);

// ok, let's create the director and tie it to the company:
BeanWrapper jim = new BeanWrapperImpl(new Employee());
jim.setPropertyValue("name", "Jim Stravinsky");
company.setPropertyValue("managingDirector", jim.getWrappedInstance());

// retrieving the salary of the managingDirector through the company
Float salary = (Float) company.getPropertyValue("managingDirector.salary");

package example;

public class ExoticType {

	private String name;

	public ExoticType(String name) {
		this.name = name;
	}
}

public class DependsOnExoticType {

	private ExoticType type;

	public void setType(ExoticType type) {
		this.type = type;
	}
}

package example;

import java.beans.PropertyEditorSupport;

// converts string representation to ExoticType object
public class ExoticTypeEditor extends PropertyEditorSupport {

	public void setAsText(String text) {
		setValue(new ExoticType(text.toUpperCase()));
	}
}

package com.foo.editors.spring;

public final class CustomPropertyEditorRegistrar implements PropertyEditorRegistrar {

	public void registerCustomEditors(PropertyEditorRegistry registry) {

		// it is expected that new PropertyEditor instances are created
		registry.registerCustomEditor(ExoticType.class, new ExoticTypeEditor());

		// you could register as many custom property editors as are required here...
	}
}

@Controller
public class RegisterUserController {

	private final PropertyEditorRegistrar customPropertyEditorRegistrar;

	RegisterUserController(PropertyEditorRegistrar propertyEditorRegistrar) {
		this.customPropertyEditorRegistrar = propertyEditorRegistrar;
	}

	@InitBinder
	void initBinder(WebDataBinder binder) {
		this.customPropertyEditorRegistrar.registerCustomEditors(binder);
	}

	// other methods related to registering a User
}