SpringBoot+Thymeleaf+JPA的基本使用
阿新 • • 發佈：2018-12-12
專案屬性配置
application.yml檔案
#cupSize: CD
#age: 18
#content: "cupSize: ${cupSize},age: ${age}" #在當前配置裡面再使用配置
#
#girl:
# cupSize: C
# age: 20
spring:
profiles:
active: dev #使用dev這個配置，區分生產環境和開發環境
resources目錄下新建application-dev.yml檔案代表開發環境
server:
port: 8081
servlet:
#context-path: "/url" resources目錄下新建application-prod.yml檔案代表生產環境，可以使用和開發環境不一樣的配置
server:
port: 8081
servlet:
#context-path: "/url"
cupSize: CD
age: 18
content: "cupSize: ${cupSize},age: ${age}" #在當前配置裡面再使用配置 GirlProperties類
@Component //如果使用@Autowired還需要使用@Component
@ConfigurationProperties(prefix = "girl") //字首屬性是girl的對映到這個類
public class GirlProperties {
private String cupSize;
private Integer age;
public String getCupSize() {
return cupSize;
}
public 注入屬性到類GirlProperties中
@Value("${cupSize}")
private String cupSize; //通過註解將配置檔案裡面的屬性注入到此
@Value("${age}")
private Integer age;
@Value("${content}")
private String content;
@Autowired
private GirlProperties girlProperties;
@RequestMapping(value = "/hello",method = RequestMethod.GET)
public String sayHi() {
return girlProperties.getCupSize();
}
@RestController
spring4之後新加的註解，原來返回json需要@ResponseBody配合@Controller
Controller和Thymeleaf模板的使用
1、第一步首先需要在pom.xml中配置Thymeleaf依賴
<!--thymeleaf模板-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
2、在application.yml檔案中增加thymeleaf配置
#thymelea模板配置
thymeleaf:
prefix: classpath:/templates/
suffix: .html
mode: HTML5
encoding: UTF-8
servlet:
content-type: text/html
cache: false #開發階段務必關閉快取
resources:
chain:
strategy:
content:
enabled: true
paths: /**
3、Controller的配置
/**
* Created by wzh-zhua on 2018/9/30.
*/
//@RestController //spring4之後新加的註解，原來返回json需要@ResponseBody配合@Controller
@Controller //配合模板使用
public class HelloController {
public String hello() {
return "/index";
}
@RequestMapping(value = "hello",method = RequestMethod.GET)
public ModelAndView index(ModelAndView mv) {
mv.setViewName("/index");
mv.addObject("title","歡迎使用Thymeleaf");
return mv;
}
}
4、在templates目錄下新建index.html檔案
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Hello Spring</title>
</head>
<body>
<h1>hello wang</h1>
<p th:text="'Hello, ' + ${title}" /><br/>
</body>
</html>
最後在瀏覽器中訪問http://localhost:8081/hello即可看到以下結果
Thymeleaf列表的使用
User.java
public class User {
private int id;
private String username;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
}
UserController.java
@Controller
@RequestMapping("user")
public class UserController {
//@RequestMapping(value = "/list", method = RequestMethod.GET)或者
@GetMapping("list")
public String listUser(Model model, @RequestParam(value = "id", required = false, defaultValue = "0") Integer id) {
List<User> userList = new ArrayList<User>();
for (int i = 0; i < 10; i++) {
User user = new User();
user.setId(i);
user.setUsername("username" + i + i);
userList.add(user);
}
model.addAttribute("users", userList);
model.addAttribute("id", id);
return "user/list";
}
// @RequestMapping(value = "/list/{id}", method = RequestMethod.GET)
// public String getUserID(@PathVariable("id") Integer id) {
// return "id"+ id;
// }
}
user/list.html檔案
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Hello Spring</title>
</head>
<body>
<span th:text="'引數中的使用者id為'+${id}"></span>
<h2>使用者列表</h2>
<div>
<ul>
<li th:each="user:${users}">
<p>ID:<span th:text="${user.id}"></span></p>
<p>名字:<span th:text="${user.username}"></span></p>
</li>
</ul>
</div>
</body>
</html>
結果
JPA資料庫操作
JPA定義
1、pom.xml中配置JPA
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>