PlayFramework（2.5.x）不绑定返回Ojbect的表单中的数据与空字段

Question

The problem is to bind data from form (or from Map of parameters) to actual Form object. 问题是将数据从表单（或从参数Map）绑定到实际的Form对象。 I have added some println just for testing purposes. 我添加了一些println仅用于测试目的。 Here is code for Controller class. 这是Controller类的代码。

package controllers;

import java.util.List;

import javax.inject.Inject;

import models.Product;
import play.data.Form;
import play.data.FormFactory;
import play.mvc.Controller;
import play.mvc.Result;

import views.html.products.list;
import views.html.products.details;

public class Products extends Controller {

@Inject
public Products(FormFactory formFactory) {
    productForm =  formFactory.form(Product.class);
  }

private static Form<Product> productForm;

public  Result list(){
    List<Product> products = Product.findAll();
    return ok(list.render(products));
}
public  Result newProduct(){
    return ok(details.render(productForm));
}
public  Result save(){
    Form<Product> filledForm=productForm.fill(new Product("0000","0000","0000"));
    Form<Product> boundForm=productForm.bindFromRequest();
    final Product product =(Product) boundForm.get();
    System.out.println(">>Bound ean form data: "+boundForm.field("ean").value()+"->Product from bound form: "+boundForm.get());
    System.out.println(">>Filled ean form data: "+filledForm.field("ean").value()+"->Product from filled form: "+filledForm.get());
    //product.save();
    flash("success",String.format("Successfully added product %s", product));
    return redirect(routes.Products.list());
}

}

Here for the purpose of simplicity class Product is just of three public fields: 这里为了简化class Product的目的， class Product只是三个公共领域：

package models;


public class Product {


    public String ean;
    public String name;
    public String description;

    public Product() {}

    public Product(String ean, String name, String description) {
        this.ean = ean;
        this.name = name;
        this.description = description;
    }

    public String toString() {
        return String.format("%s - %s", ean, name);
    }


}

And here is Play template( without main wrapper template that take care of <head> <body> stuff) 这里是播放模板（没有main包装模板，负责<head> <body>东西）

@(productForm: Form[Product])
@import helper._

@main("Product form") {
<div class="main">
<h1>Product form</h1>
@helper.form(action = routes.Products.save(),'_class -> "form-group") {
<fieldset>
    <legend>Product (@productForm("name").valueOr("New"))</legend>
    @helper.inputText(productForm("ean"), '_label -> "EAN",'_class->"input")
    @helper.inputText(productForm("name"),'_label -> "Name",'_class->"input")
    @helper.textarea(productForm("description"), '_label -> "Description",'_class->"input")
</fieldset>
<input type="submit" class="btn btn-success" value="Save">
<a class="btn btn-warning" href="@routes.Products.index()">Cancel</a>
}

} }

Everything rides nice and smooth except that I get Product object with null fields, but field(fieldName).value() or data() return correct data. 除了我得到具有空字段的Product对象外，所有东西都很顺利，但是field(fieldName).value()或data()返回正确的数据。 Looks like Form behaves as DynamicForm. 看起来Form表现为DynamicForm。 Strange things starting to happen when I use bind(Map<String,String>) instead of bindFromRequest() - same result both. 当我使用bind(Map<String,String>)而不是bindFromRequest()时，奇怪的事情开始发生 - 两者都是相同的结果。 And resul from console is (i have used testEAN filling the form "ean" field) 从控制台得到的结果是（我用testEAN填写了表格“ean”字段）

    >>Bound ean form data: testEAN->Product from bound form: null - null
    >>Filled ean form data: null->Product from filled form: 0000 - 0000

Answer 1

Need to add property accessors/mutators ( getXXX/setXXX ) in Product class . 需要在Product class添加属性访问器/ mutator（ getXXX/setXXX ）。 That is crucial point 这是至关重要的一点

Answer 2

You have to provide the type of the form 您必须提供表单的类型

Form<Product> boundForm = factoryForm.form(Product.class).bindFromRequest();
Product product = boundForm.get();

If you do not provide the type of the object you are biding how play will infer the fields and properties?! 如果您没有提供对象的类型，那么游戏将如何推断字段和属性？！

PlayFramework（2.5.x）不绑定返回Ojbect的表单中的数据与空字段

问题描述

2 个解决方案

解决方案1
5 已采纳 2017-03-26 19:33:08

解决方案2
1 2017-03-24 16:07:49

PlayFramework（2.5.x）不绑定返回Ojbect的表单中的数据与空字段

问题描述

2 个解决方案

解决方案1 5 已采纳 2017-03-26 19:33:08

解决方案2 1 2017-03-24 16:07:49

解决方案1
5 已采纳 2017-03-26 19:33:08

解决方案2
1 2017-03-24 16:07:49