IDEA使用(4 springboot 前端thymeleaf 尝试)

springboot 官方不推荐使用jsp作为页面显示,

而是推荐使用thymeleaf

首先导入依赖包

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

配置application.properties文件

设置不使用缓存

spring.thymeleaf.cache=false

编写controller

@RestController
public class HelloWorld {

    @RequestMapping("/user")
    public String user(HttpServletRequest request){

request.setAttribute("user","hello thymeleaf"); return "user"; }}

然后再resource目录下创建templates 文件夹

IDEA使用(4 springboot 前端thymeleaf 尝试)

在themplates下新建html文件

<!DOCTYPE html>
<html  xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>templates 测试页</title>
</head>
<body>
<h1 th:text="${user}">Hello</h1>
</body>
</html>

然后启动项目

喜闻乐见,有报错

Description:
Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
Reason: Failed to determine a suitable driver class
Action:
Consider the following:
If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.

If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).

原因

spring boot 会默认加载org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration这个类

DataSourceAutoConfiguration类使用了@Configuration注解向spring注入了dataSource bean。因为工程中没有关于dataSource相关的配置信息，当spring创建dataSource bean因缺少相关的信息就会报错。

解决方式

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
public class DemoApplication {

   public static void main(String[] args) {
      SpringApplication.run(DemoApplication.class, args);
   }
}

然后,项目不报错了,但是据结果并不是想要的,并没有去访问thymeleaf页面,而是直接返回了字符串

IDEA使用(4 springboot 前端thymeleaf 尝试)

错误的原因是: 注解使用错误,

@RestController=Controller + ResponseBody

返回的内容是你return中的内容，如果是return "Hello World"，页面显示的就是Hello World。加上Controller，返回的是return中对应的页面,比如return “hello”,页面的名称是hello。

@Controller
public class HelloWorld {

报错

org.thymeleaf.exceptions.TemplateInputException: Error resolving template "user", template might not exist or might not be accessible by any of the configured Template Resolvers

出错原因: 这个就比较低级的错误了

文件夹命名错误,

大功告成

IDEA使用(4 springboot 前端thymeleaf 尝试)

再测试点其他的

package com.example.demo.web;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by shj on 2018/7/12.
 */
@Controller
public class HelloWorld {

    @RequestMapping("/user")
    public String
     user(HttpServletRequest request){

        List<String> list1=new ArrayList<>();
        for (int i = 0; i <10 ; i++) {
            list1.add(""+i);
        }
        request.setAttribute("list",list1);
        request.setAttribute("user","hello thymeleaf");
        return "user";
    }


    @RequestMapping("/user1")
    public String user1(HttpServletRequest request){

        List<String> list1=new ArrayList<>();
        for (int i = 0; i <10 ; i++) {
            list1.add(""+i);
        }
        request.setAttribute("list",list1);

request.getSession().setAttribute("shj","帅哥");

return "/user1"; }}

<!DOCTYPE html>
<html  xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>templates 测试页</title>
</head>
<body>
<h1 th:text="${user}">Hello</h1>

11111
<table border="1px solid red">

<tr th:each="str:${list}">
    <td th:text="${str}">null </td>

</tr>

</table>

</body>
</html>

<!DOCTYPE html>
<html  xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>templates 测试页11</title>
</head>
<body>

<h1 th:text="${shj}">Hello</h1>

IDEA使用(4 springboot 前端thymeleaf 尝试)

user1中的值存在session中,所以没有直接取出来

如果想要取存放到sess中的值,需要加上作用域

<h1 th:text="${session.shj}">Hello</h1>

IDEA使用(4 springboot 前端thymeleaf 尝试)

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