- Заменил шаблонизатор Mustache на Freemarker.

https://www.youtube.com/watch?v=8MlXahJXLFg&list=PLU2ftbIeotGpAYRP9Iv2KLIwK36-o_qYk&index=7

pom.xml

@@ -24,7 +24,7 @@
     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-mustache</artifactId>
+            <artifactId>spring-boot-starter-freemarker</artifactId>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>

src/main/java/net/sytes/kashey/sweater/controller/MainController.java

@@ -8,12 +8,11 @@ import net.sytes.kashey.sweater.security.CustomUserDetails;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
 import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 
-import java.util.Map;
-
 @Controller
 public class MainController {
 
@@ -31,9 +30,14 @@ public class MainController {
     }
 
     @GetMapping("/main")
-    public String findAllMessages(Map<String, Object> model) {
+    public String findAllMessages(@RequestParam(required = false, defaultValue = "") String tag, Model model) {
 
-        model.put("messages", messageRepository.findAll());
+        if (tag == null || tag.isEmpty()) {
+            model.addAttribute("messages", messageRepository.findAll());
+        } else {
+            model.addAttribute("messages", messageRepository.findByTag(tag));
+        }
+        model.addAttribute("tag", tag);
         return "main";
     }
 
@@ -41,24 +45,15 @@ public class MainController {
     public String addMessage(@AuthenticationPrincipal CustomUserDetails details,
                              @RequestParam String text,
                              @RequestParam String tag,
-                             Map<String, Object> model) {
+                             Model model) {
 
         User author = userRepository.findByUsername(details.getUsername())
                 .orElseThrow(() -> new UsernameNotFoundException("User not found: " + details.getUsername()));
 
         messageRepository.save(new Message(text, tag, author));
-        model.put("messages", messageRepository.findAll());
+        model.addAttribute("messages", messageRepository.findAll());
+        model.addAttribute("tag", "");
         return "main";
     }
 
-    @PostMapping("filter")
-    public String filterByTag(@RequestParam String tag, Map<String, Object> model) {
-
-        if (tag == null || tag.isEmpty()) {
-            model.put("messages", messageRepository.findAll());
-        } else {
-            model.put("messages", messageRepository.findByTag(tag));
-        }
-        return "main";
-    }
 }

src/main/java/net/sytes/kashey/sweater/domain/Message.java

@@ -5,7 +5,7 @@ import jakarta.persistence.*;
 @Entity
 public class Message {
     @Id
-    @GeneratedValue(strategy= GenerationType.AUTO)
+    @GeneratedValue(strategy = GenerationType.AUTO)
     private Integer id;
     private String text;
     private String tag;
@@ -17,11 +17,6 @@ public class Message {
     public Message() {
     }
 
-    public Message(String text, String tag) {
-        this.text = text;
-        this.tag = tag;
-    }
-
     public Message(String text, String tag, User author) {
         this.text = text;
         this.tag = tag;
@@ -61,6 +56,6 @@ public class Message {
     }
 
     public String getAuthorName() {
-        return author == null ? "<none>": author.getUsername();
+        return author == null ? "&lt;none&gt;" : author.getUsername();
     }
 }

src/main/resources/application.properties

@@ -3,5 +3,5 @@ spring.datasource.url=jdbc:mysql://${MYSQL_HOST:localhost}:3306/sweater_db
 spring.datasource.username=user
 spring.datasource.password=123456
 spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
-spring.mustache.servlet.expose-request-attributes=true
-
+spring.freemarker.expose-request-attributes=true
+spring.freemarker.suffix=.ftl

src/main/resources/templates/greeting.ftl

@@ -0,0 +1,5 @@
+<#import "parts/common.ftl" as com>
+<@com.page>
+<div>Hello there</div>
+<a href="/main">Main page</a>
+</@com.page>

src/main/resources/templates/greeting.mustache

@@ -1,11 +0,0 @@
-<!DOCTYPE HTML>
-<html>
-<head>
-    <title>Getting Started: Serving Web Content</title>
-    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
-</head>
-<body>
-<div>Hello there</div>
-<a href="/main">Main page</a>
-</body>
-</html>

src/main/resources/templates/login.ftl

@@ -0,0 +1,8 @@
+<#import "parts/common.ftl" as com>
+<#import "parts/login.ftl" as l>
+
+<@com.page>
+    Login page
+    <@l.login "/login" />
+    <a href="/registration">Add new user</a>
+</@com.page>

src/main/resources/templates/login.mustache

@@ -1,16 +0,0 @@
-<!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml">
-<head>
-    <title>Spring Security Example </title>
-</head>
-<body>
-Login page
-<form action="/login" method="post">
-    <div><label> User Name : <input type="text" name="username"/> </label></div>
-    <div><label> Password: <input type="password" name="password"/> </label></div>
-    <div><input type="submit" value="Sign In"/></div>
-    <input type="hidden" name="_csrf" value="{{_csrf.token}}" />
-</form>
-<a href="/registration">Add new user</a>
-</body>
-</html>

src/main/resources/templates/main.ftl

@@ -0,0 +1,36 @@
+<#import "parts/common.ftl" as com>
+<#import "parts/login.ftl" as l>
+<@com.page>
+    <div>
+        <@l.logout />
+    </div>
+
+    <div>
+        <form method="post">
+            <input type="text" name="text" placeholder="Enter message" />
+            <input type="text" name="tag" placeholder="tag">
+            <input type="hidden" name="_csrf" value="${_csrf.token}" />
+            <button type="submit">Add message</button>
+        </form>
+    </div>
+    <div>
+        <form method="get" action="/main">
+            Tag to filer
+            <br>
+            <input type="text" name="tag" value="${tag}">
+            <button>Find</button>
+        </form>
+    </div>
+
+    <div>Messages list</div>
+    <#list messages as message>
+        <div>
+            <b>${message.id}</b>
+            <span>${message.text}</span>
+            <i>${message.tag}</i>
+            <strong>${message.authorName}</strong>
+        </div>
+    <#else>
+        No messages found
+    </#list>
+</@com.page>

src/main/resources/templates/main.mustache

@@ -1,39 +0,0 @@
-<html>
-<body>
-
-<div>
-    <form action="/logout" method="post">
-        <input type="hidden" name="_csrf" value="{{_csrf.token}}" />
-        <input type="submit" value="Sign Out"/>
-    </form>
-</div>
-
-<div>
-    <form method="post">
-        <input type="text" name="text" placeholder="Enter message"> </input>
-        <input type="text" name="tag" placeholder="tag"></input>
-        <input type="hidden" name="_csrf" value="{{_csrf.token}}" />
-        <button type="submit">Add message</button>
-    </form>
-</div>
-<div>
-    <form method="post" action="filter">
-        Tag to filer
-        <br>
-        <input type="text" name="tag">
-        <input type="hidden" name="_csrf" value="{{_csrf.token}}" />
-        <button>Find</button>
-    </form>
-</div>
-
- <div>Messages list</div>
-    {{#messages}}
-    <div>
-        <b>{{id}}</b>
-        <span>{{text}}</span>
-        <i>{{tag}}</i>
-        <strong>{{authorName}}</strong>
-    </div>
-    {{/messages}}
-</body>
-</html>

src/main/resources/templates/parts/common.ftl

@@ -0,0 +1,14 @@
+<#macro page>
+    <!DOCTYPE HTML>
+    <html>
+    <head>
+        <title>Sweater</title>
+        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+    </head>
+    <body>
+
+    <#nested>
+
+    </body>
+    </html>
+</#macro>

src/main/resources/templates/parts/login.ftl

@@ -0,0 +1,15 @@
+<#macro login path>
+    <form action="${path}" method="post">
+        <div><label> User Name : <input type="text" name="username"/> </label></div>
+        <div><label> Password: <input type="password" name="password"/> </label></div>
+        <div><input type="submit" value="Sign in"/></div>
+        <input type="hidden" name="_csrf" value="${_csrf.token}" />
+    </form>
+</#macro>
+
+<#macro logout>
+    <form action="/logout" method="post">
+        <input type="hidden" name="_csrf" value="${_csrf.token}" />
+        <input type="submit" value="Sign Out"/>
+    </form>
+</#macro>

src/main/resources/templates/registration.ftl

@@ -0,0 +1,11 @@
+<#import "parts/common.ftl" as com>
+<#import "parts/login.ftl" as l>
+
+<@com.page>
+    Registration page
+    <br>
+    <#if message??>
+        ${message}
+    </#if>
+    <@l.login "/registration" />
+</@com.page>

src/main/resources/templates/registration.mustache

@@ -1,20 +0,0 @@
-<!DOCTYPE html>
-<html xmlns="http://www.w3.org/1999/xhtml">
-<head>
-    <title>Spring Security Example </title>
-</head>
-<body>
-Registration page
-<br>
-{{#message}}
-    {{message}}
-{{/message}}
-<form action="/registration" method="post">
-    <div><label> User Name : <input type="text" name="username"/> </label></div>
-    <div><label> Password: <input type="password" name="password"/> </label></div>
-    <div><input type="submit" value="Add user"/></div>
-    <input type="hidden" name="_csrf" value="{{_csrf.token}}" />
-</form>
-
-</body>
-</html>