Java 如何从Thymeleaf模板设置对象字段?
我是Spring新手,我试图在Spring in action 5(Craig Walls)的帮助下学习它。我正在创建小型Spring Boot MVC应用程序。现在我对Thymeleaf有点问题 我将控制器、视图和模型作为POJO对象。当我试图从表单Intellij获取数据时,Idea告诉我这行中的ThymileAF视图有问题:Java 如何从Thymeleaf模板设置对象字段?,java,spring-boot,thymeleaf,Java,Spring Boot,Thymeleaf,我是Spring新手,我试图在Spring in action 5(Craig Walls)的帮助下学习它。我正在创建小型Spring Boot MVC应用程序。现在我对Thymeleaf有点问题 我将控制器、视图和模型作为POJO对象。当我试图从表单Intellij获取数据时,Idea告诉我这行中的ThymileAF视图有问题: Model import java.util.Date; import java.util.List; import javax.validation.constr
Model
import java.util.Date;
import java.util.List;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import lombok.Data;
@Data
public class Taco {
private Long id;
private Date createdAt;
@NotNull
@Size(min=5, message="Name must be at least 5 characters long")
private String name;
@Size(min=1, message="You must choose at least 1 ingredient")
private List<Ingredient> ingredients;
}
我注意到你的代码上有两件事
th:action
formmethod=“POST”th:object=“${taco}”
更改为formmethod=“POST”th:object=“${design}”
尝试修复这两个问题,它应该会起作用。我在代码中发现了两件事:
th:action
标记添加操作th:object=“${taco}”
为html表单声明对象。但您不会在控制器中的model方法中添加“taco”对象,从中返回html设计。您应该在控制器方法中添加“taco”对象,如下所示
model.addAttribute(“taco”,taco对象)我遇到了同样的问题 我的解决方案是在Taco.java中为name添加getter。不知何故,lombok并没有在运行时自动生成getter 和
th:object=“${taco}”
应该是th:object=“${design}”
无需更改th:action
。来自教程
如果再次查看视图中的标记,可以看到其method属性设置为POST。此外,没有声明action属性。这意味着提交表单时,浏览器将收集表单中的所有数据,并以HTTP POST请求的形式将其发送到服务器,发送路径与GET请求在表单/设计路径中显示的路径相同
您的html第64行有什么内容?对不起。这一列第32列从这里开始,将
更改为
它可以工作,但输入错误正常,但另一个页面部分不工作(为什么我应该将taco更改为design?您指的是页面的另一部分是什么?您如何看到我从数据库中获取数据并在视图中显示这些数据,以及此构造成分,如果我将th:object替换为th:object=“${design}”我听不懂你们在说什么。看一下百里香的文档。谢谢你们的帮助。我解决了问题。你们是对的。
<!DOCTYPE html>
<html lang="en"
xmlns="http://www.w3.org/1999/xhtml"
xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Taco Cloud</title>
<link rel="stylesheet" th:href="@{/styles.css}"/>
</head>
<body>
<h1>Design your taco!</h1>
<img src="../static/images/TacoCloud.png" alt="TacoCloud.png" th:src="@{/images/TacoCloud.png}">
<form method="POST" th:object="${taco}">
<div class="grid">
<div class="ingredient-group" id="wraps">
<h3>Designate yor wrap:</h3>
<div th:each="ingredient:${wrap}">
<input name="ingredients" type="checkbox" th:value="${ingredient.id}"/>
<span th:text="${ingredient.name}">INGREDIENT</span><br/>
</div>
</div>
<div class="ingredient-group" id="proteins">
<h3>Pick your protein:</h3>
<div th:each="ingredient: ${protein}">
<input name="ingredients" type="checkbox" th:value="${ingredient.id}"/>
<span th:text="${ingredient.name}">INGREDIENT</span>
</div>
</div>
<div class="ingredient-group" id="cheeses">
<h3>Choose your cheese:</h3>
<div th:each="ingredient:${cheese}">
<input name="ingredients" type="checkbox" th:value="${ingredient.id}"/>
<span th:text="${ingredient.name}">INGREDIENT</span><br/>
</div>
</div>
<div class="ingredient-group" id="veggies">
<h3>Determine your veggies:</h3>
<div th:each="ingredient : ${veggies}">
<input name="ingredients" type="checkbox" th:value="${ingredient.id}"
/>
<span th:text="${ingredient.name}">INGREDIENT</span><br/>
</div>
</div>
<div class="ingredient-group" id="sauces">
<h3>Select your sauce:</h3>
<div th:each="ingredient : ${sauce}">
<input name="ingredients" type="checkbox" th:value="${ingredient.id}"
/>
<span th:text="${ingredient.name}">INGREDIENT</span><br/>
</div>
</div>
</div>
<div>
<h3>Name your taco creation:</h3>
<input type="text" name="name" th:field="*{name}"/>
<br/>
<button>Submit your taco</button>
</div>
</form>
</body>
</html>
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.Errors;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import tacos.Ingredient.Type;
import tacos.Ingredient;
import org.springframework.web.bind.annotation.ModelAttribute;
import tacos.Taco;
import tacos.data.IngredientRepository;
import javax.validation.Valid;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
@Slf4j
@Controller
@RequestMapping("/design")
public class DesignTacoController {
private final IngredientRepository ingredientRepo;
@Autowired
public DesignTacoController(IngredientRepository ingredientRepo){
this.ingredientRepo=ingredientRepo;
}
@GetMapping
public String showDesignForm(Model model) {
List<Ingredient> ingredients=new ArrayList<>();
ingredientRepo.findAll().forEach(i->ingredients.add(i));
Type[] types = Ingredient.Type.values();
for (Type type : types) {
model.addAttribute(type.toString().toLowerCase(),
filterByType(ingredients, type));
}
return "design";
}
private List<Ingredient> filterByType(
List<Ingredient> ingredients, Type type) {
return ingredients
.stream()
.filter(x -> x.getType().equals(type))
.collect(Collectors.toList());
}
@PostMapping
public String processDesign(@Valid @ModelAttribute("design") Taco design, Errors errors, Model model) {
if (errors.hasErrors()) {
return "design";
}
// Save the taco design...
// We'll do this in chapter 3
log.info("Processing design: " + design);
return "redirect:/orders/current";
}
}
org.thymeleaf.exceptions.TemplateInputException: An error happened during template parsing (template: "class path resource [templates/design.html]")
Caused by: org.attoparser.ParseException: Error during execution of processor 'org.thymeleaf.spring5.processor.SpringInputGeneralFieldTagProcessor' (template: "design" - line 64, col 45)