我正在学习
Spring MVC,我到处寻找一个基本的控制器来查看数据绑定,但我没有尝试过任何工作.我可以将视图发布回控制器,我可以在那里看到带有属性的pojo,但每当我尝试将该对象添加到模型时,我什么也得不到.这是我到目前为止：
调节器
@Controller
public class HomeController {
@RequestMapping(value = "/",method = RequestMethod.GET)
public String home(Model model) {
model.addAttribute(new Person());
return "home";
}
@RequestMapping(value="/about",method=RequestMethod.POST)
public void about(Person person,Model model)
{
model.addAttribute("person",person);
}
}
我要绑定的类
public class Person {
private String _firstName;
private String _lastName;
private Date _Birthday;
//Set
public void setFirstName(String FirstName){this._firstName = FirstName; }
public void setLastName(String LastName){this._lastName= LastName; }
public void setBirthDate(Date BirthDate){ this._Birthday = BirthDate;}
//get
public String getFirstName(){return _firstName;}
public String getLastName(){return _lastName;}
public Date getBirthDate(){return _Birthday;}
}
查看 – 控制器到表单！工作
<Meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /> <html> </head> <body> FirstName: ${model.person.getFirstName} LastName: ${model.person.getLastName} </body> </html>
我可以或需要做什么才能让它绑定？
解决方法
模型属性是您在这里缺少的东西.
@Controller
public class HomeController {
@modelattribute("person")
public Person getPerson(){
return new Person();
}
@RequestMapping(value = "/",method = RequestMethod.GET)
public String home() {
return "home";
}
@RequestMapping(value="/about",method=RequestMethod.POST)
public void about(@modelattribute("person") Person person,BindingResult result,Model model)
{
if( ! result.hasErrors() ){
// note I haven't compiled this code :)
}
}
}
我们的想法是在GET和POST上都会调用@modelattribute方法,在GET请求中它只会暴露给视图,而在POST上它将用于绑定请求参数.
请注意,BindingResult将传递给POST方法,以便您可以使用该命令执行某些操作.
