1.首先我们来解决一个问题
关于出现的An error happened during template parsing (template: "class path resource [templates/index.html]")报错
一般这种情况只出现在视图层，也就是我们的thymeleaf中的问题，跟java代码是没有关系的，然后我们进行排查
一般来说指定文件改成<html lang="en" xmlns:th="http://www/thymeleaf.org">只需要一个即可如果还存在问题则是视图层代码中的问题
2.我们直接给代码吧
package demo.entity;
public class MyUser {
private String userName;
private Integer age;
public MyUser(String userName, Integer age) {
this.userName = userName;
this.age = age;
}
public void setUserName(String userName) {
this.userName = userName;
}
public void setAge(Integer age) {
this.age = age;
}
public String getUserName() {
return userName;
}
public Integer getAge() {
return age;
}
}
然后我们来编写controller层的接口
文件
package demo.controller;
import demo.entity.MyUser;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.Map;
@Controller
public class MyThymeleafController {
@RequestMapping("/myThymeleaf")
public String myThymeleaf(HttpServletRequest request, Map<String,Object> result){
request.setAttribute("user",new MyUser("xiaotaozi",27));
//第一种跟第二种的写法是有点差别，但是实际结果是一致的
//result.put("user",new myUser("xiaolili",27))
ArrayList<MyUser> myUsers=new ArrayList<>();
myUsers.add(new MyUser("xiaotaozi",27));
myUsers.add(new MyUser("xiaolili",23));
myUsers.add(new MyUser("xiaofeiji",24));
result.put("userList",myUsers);
return "myThymeleaf";
}
}
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www/thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Show User</title>
</head>
<body>
<table>
姓名：<span th:text="${user.userName}"></span>
年龄：<span th:text="${user.age}"></span>
<ul th:each="user:${userList}">
<li th:text="${user.userName}"></li>
<li th:text="${user.age}"></li>
</ul>
<span th:if="${user.age>17}">已经成年啦</span>
<span th:if="${user.age<17}">已经成年啦</span>
</table>
</body>
</html>
启动类
package demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@SpringBootApplication
//@ComponentScan("demo")
public class demoApplication {
public static void main(String[] args){
SpringApplication.run(demoApplication.class);
}
}
把启动类启动之后我们来看看效果
