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2020java框架教程之spring处理模型数据

1.使用entity将数据从页面传递到 controller

绑定参数

entity：

User:

String username,String password,Integer age,String email,Address address

Address:

String addr,String zipCode

JSP:

<form action="add" method="post">
    <label for="username">
        username : <input type="text" id="username" name="username"><br>
    </label>
    <label for="password">
        password : <input type="password" name="password" id="password"><br>
    </label>
    <label for="age">
        age : <input type="text" name="age" id="age"><br>
    </label>
    <label for="email">
        email : <input type="email" name="email" id="email"><br>
    </label>
    <label for="address.addr">
        addr : <input type="text" name="address.addr" id="address.addr"><br>
    </label>
    <label for="address.zipCode">
        zipCode : <input type="text" name="address.zipCode" id="address.zipCode"><br>
    </label>
    <button>submit</button>
</form>

controller:

@RequestMapping("/user")
@Controller
public class UserController {
    @RequestMapping("/form")
    public String testUser(){
        return "form";
    }
    @RequestMapping("/add")
    public String add(User user){
        System.out.println(user);
        return "success";
    }
}

2.ModelAndView

@RequestMapping("/edit")
public ModelAndView edit(){
    User u=new User("张三","123",12,"12@qq.com",new Address("ah","123"));
    ModelAndView mav=new ModelAndView("form");
    mav.addObject("user",u);
    return mav;
}

然后在表单的value值用表达式填入

3.Map

@RequestMapping("/edit1")
public String edit1(Map<String,Object> map){
    User u=new User("张三1","123",12,"12@qq.com",new Address("ah","123"));
    map.put("user",u);
    return "form";
}

4.Model

@RequestMapping("/edit2")
public String edit2(Model model){
    User u=new User("张三2","123",12,"12@qq.com",new Address("ah","123"));
    model.addAttribute("user",u);
    return "form";
}

5.sessionScope

@SessionAttributes(value = {"user"},types = {String.class})
//只将String类型参数保存在session作用域，其他类型不保存
public class UserController {

@RequestMapping("/edit1")
public String edit1(Map<String,Object> map){
    map.put("strvalue","strvalues");
    map.put("intvalue",123);
    return "form";
}
}