java在显示PostgreSQL数据库中的数据时遇到问题
我的问题是关于thymeleaf模板系统。我对使用SpringBoot还比较陌生，我有一个post对象来存储我博客的信息。我制作了一个控制器来发布我的新帖子，然后我使用Getmapping为我的博客页面提供数据库中的信息（在本例中，它是从帖子存储库返回的帖子列表）
package com.blog.blog.Controllers;
import com.blog.blog.Entities.Post;
import com.blog.blog.Repositories.PostRep;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
@Controller
public class PostController {
@Autowired
private PostRep postRep;
@GetMapping("/blog")
public String nPostForm(Model model){
//newpost is the binding object for html, contains the objects itself and th:field="*{}" is its respective item
model.addAttribute("posts", this.postRep.findAll());
System.out.println(this.postRep.findAll().toString());
return "blog";
}
@PostMapping("/newpost")
public String nPostSubmit(@ModelAttribute Post post, Model model){
model.addAttribute("newpost",post);
//here i get the post object with its variables
this.postRep.save(post);
System.out.println("Sent");
return "newpost";
}
}
这是我的HTML模板，它应该遍历列表并用数据库中的数据替换文本，但在运行它时，源代码中发生的事情是，它没有填充“title”或“content”的文本，而是看到有两篇文章是正确的，并且正确地实例化了两个div，但它没有使用“th:text”用我的文章数据替换文本
<!DOCTYPE HTML>
<html xmlns:th="https://www.thymeleaf.org">
<head>
<title>Getting Started: Handling Form Submission</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Bootstrap CSS -->
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
</head>
<body>
<div class="container" >
<div th:if="${posts.empty}">
<span>There are no posts!</span>
</div>
<div th:each="nPost : ${posts}">
<h1 th.text="nPost.title">title: </h1>
<p th.text="nPost.content">content: </p>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.9.2/dist/umd/popper.min.js" integrity="sha384-IQsoLXl5PILFhosVNubq5LC7Qb9DXgDA9i+tQ8Zj3iwWAwPtgFTxbJ8NT4GN1R8p" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.min.js" integrity="sha384-cVKIPhGWiC2Al4u+LWgxfKTRIcfu0JTxR+EQDz/bgldoEyl4H0zUF0QKbrJ0EcQF" crossorigin="anonymous"></script>
</body>
</html>
最后，我正确地从数据库中检索数据，因为当我从存储库中提取时，我可以在控制台中打印标题和内容
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