Spring Boot无法渲染动态页面问题求助

我折腾Spring Boot渲染动态页面好一阵了，一直没进展，从YouTube到AI工具都试过了，现在只能来这儿求助了。

每次访问应该显示动态页面的端点时，它只返回一个字符串（就是我控制器里return的"home"），根本不渲染页面。

我的控制器代码 #

package com.demo.student1.api;
import com.demo.student1.model.Student;
import com.demo.student1.service.StudentService;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import java.util.ArrayList;
import java.util.Optional;


@RequestMapping("/student")
@RestController
public class StudentController {

    private final StudentService studentService;
    public StudentController(StudentService studentService) {
        this.studentService = studentService;
    }

    @GetMapping("/home")
    public String home(Model model) {
        model.addAttribute("username", "John Doe");
        return "home";
    }

    @PostMapping("/register")
    public void registerStudent(@RequestBody Student student) {
        studentService.registerStudent(student);
    }

    @GetMapping("/get_student/{id}")
    public Optional<Student> getStudent(@PathVariable Long id) {
        return studentService.getStudent(id);
    }

    @GetMapping("/getStudents")
    public ArrayList<Student> getStudents() {
        return studentService.getStudents();
    }
}

动态页面代码（Thymeleaf） #

<!DOCTYPE html>
<html xmlns:th="http://thymeleaf.org">
<head>
  <meta charset="UTF-8">
  <title>Welcome Homepage For Students</title>
</head>
<body>
  <h1>Welcome to University, <span th:text="${username}"></span> to University!</h1>
</body>
</html>

Gradle依赖配置 #

dependencies {
    implementation("org.springframework.boot:spring-boot-starter-data-jpa")
    implementation("org.springframework.boot:spring-boot-starter-web")
    implementation("org.springframework.security:spring-security-web")
    implementation("org.springframework.boot:spring-boot-starter-security:3.4.1")
    implementation("io.jsonwebtoken:jjwt-api:0.12.6")
    implementation("org.springframework:spring-webmvc:6.2.2")
    implementation("org.apache.tomcat:tomcat-jasper:10.1.34")
//  implementation("org.thymeleaf:thymeleaf:3.1.3.RELEASE")
    implementation("org.springframework.boot:spring-boot-starter-thymeleaf")

    compileOnly("org.projectlombok:lombok:1.18.36")


    runtimeOnly("io.jsonwebtoken:jjwt-impl:0.12.6")
    runtimeOnly("io.jsonwebtoken:jjwt-jackson:0.12.6")
    runtimeOnly("org.postgresql:postgresql")
    testImplementation("org.springframework.boot:spring-boot-starter-test")
    testRuntimeOnly("org.junit.platform:junit-platform-launcher")
}

应用运行日志（访问端点时的输出） #

.   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/

 :: Spring Boot ::                (v3.4.1)

2025-02-08T09:24:16.263+01:00  INFO 23567 --- [student-1] [           main] com.demo.student1.Student1Application    : Starting Student1Application using Java 21.0.5 with PID 23567 (/home/isla-jr/Documents/se-workspace/learn-java/roadmap/4-web-frameworks/1-basic/student-1/build/classes/java/main started by isla-jr in /home/isla-jr/Documents/se-workspace/learn-java/roadmap/4-web-frameworks/1-basic/student-1)
2025-02-08T09:24:16.265+01:00  INFO 23567 --- [student-1] [           main] com.demo.student1.Student1Application    : No active profile set, falling back to 1 default profile: "default"
2025-02-08T09:24:16.814+01:00  INFO 23567 --- [student-1] [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2025-02-08T09:24:16.867+01:00  INFO 23567 --- [student-1] [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 44 ms. Found 2 JPA repository interfaces.
2025-02-08T09:24:17.313+01:00  INFO 23567 --- [student-1] [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port 8080 (http)
2025-02-08T09:24:17.325+01:00  INFO 23567 --- [student-1] [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2025-02-08T09:24:17.325+01:00  INFO 23567 --- [student-1] [           main] o.apache.catalina.core.StandardEngine    : Starting Servlet engine: [Apache Tomcat/10.1.34]
2025-02-08T09:24:17.457+01:00  INFO 23567 --- [student-1] [           main] org.apache.jasper.servlet.TldScanner     : At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
2025-02-08T09:24:17.460+01:00  INFO 23567 --- [student-1] [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2025-02-08T09:24:17.460+01:00  INFO 23567 --- [student-1] [           main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1154 ms
2025-02-08T09:24:17.617+01:00  INFO 23567 --- [student-1] [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [name: default]
2025-02-08T09:24:17.660+01:00  INFO 23567 --- [student-1] [           main] org.hibernate.Version                    : HHH000412: Hibernate ORM core version 6.6.4.Final
2025-02-08T09:24:17.684+01:00  INFO 23567 --- [student-1] [           main] o.h.c.internal.RegionFactoryInitiator    : HHH000026: Second-level cache disabled
2025-02-08T09:24:17.923+01:00  INFO 23567 --- [student-1] [           main] o.s.o.j.p.SpringPersistenceUnitInfo      : No LoadTimeWeaver setup: ignoring JPA class transformer
2025-02-08T09:24:17.945+01:00  INFO 23567 --- [student-1] [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2025-02-08T09:24:18.012+01:00  INFO 23567 --- [student-1] [           main] com.zaxxer.hikari.pool.HikariPool        : HikariPool-1 - Added connection org.postgresql.jdbc.PgConnection@7b3a6e95
2025-02-08T09:24:18.013+01:00  INFO 23567 --- [student-1] [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
2025-02-08T09:24:18.060+01:00  INFO 23567 --- [student-1] [           main] org.hibernate.orm.connections.pooling    : HHH10001005: Database info:
Database JDBC URL [Connecting through datasource 'HikariDataSource (HikariPool-1)']
Database driver: undefined/unknown
Database version: 16.3
Autocommit mode: undefined/unknown
Isolation level: undefined/unknown
Minimum pool size: undefined/unknown
Maximum pool size: undefined/unknown
2025-02-08T09:24:18.834+01:00  INFO 23567 --- [student-1] [           main] o.h.e.t.j.p.i.JtaPlatformInitiator       : HHH000489: No JTA platform available (set 'hibernate.transaction.jta.platform' to enable JTA platform integration)
2025-02-08T09:24:18.881+01:00  INFO 23567 --- [student-1] [           main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2025-02-08T09:24:19.173+01:00  INFO 23567 --- [student-1] [           main] eAuthenticationProviderManagerConfigurer : Global AuthenticationManager configured with AuthenticationProvider bean with name authenticationProvider
2025-02-08T09:24:19.173+01:00  WARN 23567 --- [student-1] [           main] r$InitializeUserDetailsManagerConfigurer : Global AuthenticationManager configured with an AuthenticationProvider bean. UserDetailsService beans will not be used by Spring Security for automatically configuring username/password login. Consider removing the AuthenticationProvider bean. Alternatively, consider using the UserDetailsService in a manually instantiated DaoAuthenticationProvider. If the current configuration is intentional, to turn off this warning, increase the logging level of 'org.springframework.security.config.annotation.authentication.configuration.InitializeUserDetailsBeanManagerConfigurer' to ERROR
2025-02-08T09:24:19.182+01:00  WARN 23567 --- [student-1] [           main] JpaBaseConfiguration$JpaWebConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2025-02-08T09:24:19.636+01:00  INFO 23567 --- [student-1] [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port 8080 (http) with context path '/'
2025-02-08T09:24:19.645+01:00  INFO 23567 --- [student-1] [           main] com.demo.student1.Student1Application    : Started Student1Application in 3.747 seconds (process running for 4.303)
2025-02-08T09:24:45.131+01:00  INFO 23567 --- [student-1] [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring DispatcherServlet 'dispatcherServlet'
2025-02-08T09:24:45.131+01:00  INFO 23567 --- [student-1] [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2025-02-08T09:24:45.133+01:00  INFO 23567 --- [student-1] [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet        : Completed initialization in 1 ms
Hibernate: select u1_0.id,u1_0.password,u1_0.username from...

备注：内容来源于stack exchange，提问作者Isla