@InitBinder

类型转换：

请求url：  http://localhost:8080/SSHDemo2/stu/pro?s=zk,19

传入参数 s=zk,19   转换为Student

public class Student {

	private String name;
	private int age;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	
	@Override
	public String toString() {
		return "toString  -  name="+name+";age="+age;
	}
	
}

public class StudentEditor extends PropertyEditorSupport{

	
	@Override
	public void setAsText(String text) throws IllegalArgumentException {
		Student s = new Student();
		String[] attrs = text.split(",");
		if(attrs.length==1){
			s.setName(attrs[0]);
		}
		
		if(attrs.length==2){
			s.setName(attrs[0]);
			s.setAge(Integer.parseInt(attrs[1]));
		}
		System.out.println("setAsText");
		setValue(s);
	}
	
	
	@Override
	public String getAsText() {
		System.out.println("getAsText");
		return getValue().toString();
	}
}

@Controller
@RequestMapping("/stu")
public class StudentController {

       @RequestMapping("/pro")
	public String stuPropertyEditor(@RequestParam("s") Student s){
		System.out.println("name="+s.getName()+";age="+s.getAge());
		return "success";
	}
	
	@InitBinder
	public void initBinder(WebDataBinder binder){
		System.out.println("init..");
		binder.registerCustomEditor(Student.class, new StudentEditor());
	}

}

此时也可以不要@InitBinder，因为bean为Student则StudentEditor会默认为它的属性编辑器