spring boot (二)笔记

###步骤
1:使用spring boot cli 生成基本项目
2:写dao、controller层代码
3:写thymeleaf 模板

###1:初始化项目
spring init -dweb,data-jpa,h2,thymeleaf
下载demo.zip解压 改名springboot (任意名称)
刷新maven 下载jar包构建项目

###2:dao、controller层代码
entity

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@Entity
public class Book {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
private String reader;
private String isbn;
private String title;
private String author;
private String description;
.....省略setter gettter等方法
}

定义jpa book实体的 repository

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@Repository
public interface BookRepository extends JpaRepository<Book,Long> {
List<Book> findByReader(String reader);
}

正式项目中会设立service层 这里就不写了 就是跟平常写spring 项目一样的玩法
定义 controller层 新增和查看控制器

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@Controller
public class ReadingListController {

@Resource
BookRepository bookRepository;

@RequestMapping(value = "/{reader}",method = RequestMethod.GET)
public String readersBook(Model model,
@PathVariable(value = "reader",required = false)String reader){
List<Book> books= bookRepository.findByReader(reader);
if (books!=null){
model.addAttribute("books",books);
}
return "readingList";
}

@RequestMapping(value = "/{reader}",method = RequestMethod.POST)
public String addToReadingList(@PathVariable(value = "reader",required = false) String reader,Book book){
book.setReader(reader);
bookRepository.save(book);
return "redirect:/{reader}";
}
}

###thymeleaf 模板引擎代码

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<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head>
<meta charset="UTF-8"/>
<title>阅读列表</title>
</head>
<body>
<h2>你的阅读列表</h2>
<div th:unless="${#lists.isEmpty(books)}">
<dl th:each="book : ${books}">
<dt class="bookHeadline">
<span th:text="${book.title}">标题</span>
<span th:text="${book.author}">作者</span>
(ISBN: <span th:text="${book.isbn}">ISBN</span>)
</dt>
<dd class="bookDescription">
<span th:if="${book.description}"
th:text="${book.description}">Description</span>
<span th:if="${book.description eq null}">
description为空</span>
</dd>
</dl>
</div>
<div th:if="${#lists.isEmpty(books)}">
<p>当前没有阅读</p>
</div>

<hr/>
<h3>添加书</h3>
<!--只需要进控制器即可 直接post当前路径-->
<form method="POST">
<label>标题:</label>
<input type="text" name="title" size="50"></input><br/>
<label>作者:</label>
<input type="text" name="author" size="50"></input><br/>
<label>ISBN:</label>
<input type="text" name="isbn" size="15"></input><br/>
<label>Description:</label><br/>
<textarea name="description" cols="80" rows="5">
</textarea><br/>
<input type="submit"></input>
</form>
</body>
</html>

##浏览器打开http://localhost:8080/sss(任意字符串 进 get /{reader}控制器即可)

###代码地址:https://github.com/xuxianyu/myGitHub/tree/master/springboot

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