基本Spring MVC数据绑定 [英] Basic Spring MVC Data Binding
问题描述
控制器
@Controller
public class HomeController {
@RequestMapping（value =/，method = RequestMethod.GET）
public String home（Model model）{
model.addAttribute（new Person（））;
返回home;
}
@RequestMapping（value =/ about，method = RequestMethod.POST）
public void about（Person person，Model model）
{
model.addAttribute（person，person）;
}
}
类我想绑定
public class Person {
private String _firstName;
private String _lastName;
私人日期_Birthday;
//设置
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-Typecontent =text / html; charset = ISO-8859- 1/>
< html>
< / head>
< body>
FirstName：$ {model.person.getFirstName}
LastName：$ {model.person.getLastName}
< / body>
< / html>
我可以或需要这样做才能绑定？
模型属性是你在这里缺少的东西。
@Controller
public class HomeController {
@ModelAttribute（person）
public Person getPerson（）{
return new Person（）;
}
@RequestMapping（value =/，method = RequestMethod.GET）
public String home（）{
returnhome;
}
@RequestMapping（value =/ about，method = RequestMethod.POST）
public void about（@ModelAttribute（person）Person person，BindingResult result，模型模型）
{
if（！result.hasErrors（））{
//注意我还没有编译这个代码:)
}
}
}
这个想法是在GET和POST两端将调用@ModelAttribute方法在GET请求中，它将被暴露给视图，在POST中它将用于绑定请求参数。
请注意， BindingResult 传递给POST方法，以便您可以使用命令执行某些操作。
I'm learning Spring MVC and I've looked everywhere to do just a basic controller to view data binding but nothing I've tried as work. I can bind view posting back to controller and I can see the pojo with properties there, however whenever I tried to add that object to the model I get nothing. Here is what I have so far:
Controller
@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);
}
}
Class I want to bind
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;}
}
View - Controller-to-Form ! Working
<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>
What can I or need this to do get it to bind?
The model attribute is the thing you are missing here.
@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 :)
}
}
}
The idea is that the @ModelAttribute method will be invoked on both the GET and the POST, on the GET request it will just be exposed to the view where as on the POST it will be used to bind the request parameters.
Note that the BindingResult is passed to the POST method, so that you can do something with the command.
这篇关于基本Spring MVC数据绑定的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
