我正在做一项任务,正在使用胸腺叶和spring创建网页。我有它的大部分工作,但我似乎不能得到一个图像加载。
我的html:
<!DOCTYPE html>
<html xmlns:th="https//www.thymeleaf.org">
<head>
<title>A Course</title>
<link rel="stylesheet" type="text/css"
href="/css/ReviewPageStyleSheet.css" />
</head>
<body>
<h1 id="heading">A Single Course</h1>
<img th:src="@{${'/images/' + review.image}}">
<div id="list" th:each="review: ${reviews}">
<p th:text="${review.title}"></p>
<p th:text="${review.category}"></p>
<a href="http://localhost:8080/show-all-reviews">Back to home</a>
</div>
</body>
</html>
我的控制器:
package org.wecancodeit.reviewsite;
import javax.annotation.Resource;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
@Controller
public class ReviewSiteController {
@Resource
ReviewSiteRepository reviewsRepo;
@RequestMapping("/show-all-reviews")
public String findAllReviews(Model model) {
model.addAttribute("reviews", reviewsRepo.findAll());
return "reviews";
}
@RequestMapping("review")
public String findOneReview(@RequestParam(value = "id") Long id, Model model) {
model.addAttribute("reviews", reviewsRepo.getOneCourse(id));
return "review";
}
}我的存储库:
package org.wecancodeit.reviewsite;
import java.util.Collection;
import java.util.HashMap;
import org.springframework.stereotype.Repository;
@Repository
public class ReviewSiteRepository {
private HashMap<Long, Review> reviewList = new HashMap<Long, Review>();
public ReviewSiteRepository() {
Review springMVC = new Review(1L, "Spring Boot & MVC",
"This page reviews information on how to use Spring Boot & MVC and its functionality. ", "java.png");
Review thymeleaf = new Review(2L, "Thymeleaf",
"This page reviews information on what Thymeleaf is, and how to use it.", "thyme.jpg");
Review htmlcss = new Review(3L, "HTML & CSS", "This page reviews what HTML and CSS are, and how to use them. ",
"html.png");
reviewList.put(springMVC.getId(), springMVC);
reviewList.put(thymeleaf.getId(), thymeleaf);
reviewList.put(htmlcss.getId(), htmlcss);
}
public ReviewSiteRepository(Review... reviews) {
for (Review review : reviews) {
reviewList.put(review.getId(), review);
}
}
public Review getOneReview(long firstTestId) {
return reviewList.get(firstTestId);
}
public Collection<Review> findAll() {
return reviewList.values();
}
public Review getOneCourse(Long id) {
return reviewList.get(id);
}
}最后是java类:
package org.wecancodeit.reviewsite;
public class Review {
private Long Id;
private String title;
private String category;
private String image;
Review(Long id, String title, String category, String image) {
this.Id = id;
this.title = title;
this.category = category;
this.image = image;
}
public Long getId() {
return Id;
}
public String getTitle() {
return title;
}
public String getCategory() {
return category;
}
public String getImage() {
return image;
}
}我很难弄清楚如何动态链接图片。当我运行服务器时,我得到一个错误,说“属性或字段'image‘不能在null上找到”。由于某种原因,在图像中的胸腺叶中,src没有抓住我的评论。如果我在图像的正确路径中硬编码,我可以让它呈现,但当我转到不同的页面时它不会改变。
发布于 2018-09-27 23:59:41
不要连接。您可以使用Thymeleaf的表达式构建URL,如下所示:
<img th:src="@{/images/{image}(image=${review.image})}">在本例中,{image}是一个变量,该变量的值在括号:(image=thevalue)之间指定。因为值本身是一个表达式,所以使用正则表达式语法:(image=${review.image})。
它比连接有点冗长,但在URL更复杂的情况下更简洁:
th:src="@{/a/very/long/url/with/{howMany}/parameters/?id={id}&date={date}(howMany=1,id=999,date='2018-09-26')}"发布于 2018-09-28 00:36:40
我找到问题了。
在我的控制器中,在reviews的请求映射下,我将属性注入为" review“,而不是”review“。一封信就能把整件事搞得一团糟。
https://stackoverflow.com/questions/52540790
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