數據綁定彈簧

我有一個Contact對象放在請求中，這個對象在窗體中被修改，然後得到修改的對象。我希望返回的對象與您發送的對象相同，您保留不在表單中的屬性的值。數據綁定彈簧

class Contact{ 

    private String name;   // this attributes will be modified 
    private String lastName; 

    private Long id; 
    private Date created;  // this atributes will not be modified 

    // getters and setters .... 

} 


    @RequestMapping(value = "/{id}/edit", method = RequestMethod.GET) 
    public String updateContact(@PathVariable("id") Long id, Model model) { 

     Contact c = contactDao.get(id); 
     model.addAttribute("contact", c); 

     return "contact/form"; 

    } 



    @RequestMapping(value = "/{id}/edit", method = RequestMethod.POST) 
    public String update(@PathVariable("id") Long id, @Valid @ModelAttribute Contact contact, BindingResult result, Model model) { 

     // The contact I get here I want to keep the original attributes of the 
     // object sent, and have the changes in the fields shown on the form. is that possible? 

     return "redirect:/contact"; 
    } 


    <form:form action="${pageContext.servletContext.contextPath}/tags/create"   commandName="contact"> 

       <form:input path="name"/> 
       <form:errors path="name" cssClass="formError"/> 
       <form:input path="lastName"/> 

    </form:form>

我不想使用隱藏字段來維護不會改變

來源

2012-02-06 Jhonathan

我找到了解決問題的辦法時指出接觸對象爲居住在會話對象

@Controller 
@RequestMapping("/contact") 
@SessionAttributes("contact") 
public class ContactController { 

.... 
.... 


    @RequestMapping(value = "/{id}/edit", method = RequestMethod.GET) 
    public String updateContact(@PathVariable("id") Long id, Model model) { 

     Contact c = contactDao.get(id); 
     model.addAttribute("contact", c); 
     return "contact/form"; 

    } 


    @RequestMapping(value = "/{id}/edit", method = RequestMethod.POST) 
    public String update(@PathVariable("id") Long id, @Valid @ModelAttribute Contact contact, BindingResult result, Model model) { 

     contactDao.update(contact); 

     return "redirect:/contact"; 
    } 
}

來源

2012-02-07 14:45:54 Jhonathan

的屬性值，如果你只想要一些字段的形式處理，使一個新的類 - 僅包含它們的ContactDTO，然後手動（或通過反射）將它們複製到原始的Contact對象（您通過數據庫中的id加載）

來源

2012-02-06 22:20:54 Bozho

這就是我我在做，而我沒有 – Jhonathan 2012-02-06 22:23:37

-1

什麼是您的持久性框架？是JPA還是休眠？如果是這樣，註釋字段@Column（更新= FALSE）

來源

2012-02-06 22:38:22

數據綁定彈簧

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