Я новичок в разработке загрузки Spring, помогите мне с ошибкой
Структура каталогов (включая структуру только важных файлов)
src
-main
-java
-com.example.handlingformsubmission
-Greeting.java
-GreetingController.java
-HandlingFormSubmissionApplication.java
-resources
-templates
-greeting.html
-result.html
-application.properties
-test
-java
-com.example.handlingformsubmission
-HandlingFormSubmissionApplicationTest.java
-build.gradle
Во время выполнения я столкнулся с этой ошибкой, когда Я запускаю его в браузере
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Wed Mar 11 19:08:44 IST 2020
There was an unexpected error (type=Not Found, status=404).
No message available
и когда я завершаю или останавливаю приложение
Execution failed for task ':HandlingFormSubmissionApplication.main()'.
> Process 'command '/usr/lib/jvm/java-11-amazon-corretto/bin/java'' finished with non-zero exit value 143
В настоящее время я использую Springboot версии 2.2.2
Вот мой код
build.gradle
plugins {
id 'org.springframework.boot' version '2.2.2.RELEASE'
id 'io.spring.dependency-management' version '1.0.8.RELEASE'
id 'java'
id 'war'
}
group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'
repositories {
mavenCentral()
}
dependencies {
implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
implementation 'org.springframework.boot:spring-boot-starter-web'
testImplementation('org.springframework.boot:spring-boot-starter-test') {
exclude group: 'org.junit.vintage', module: 'junit-vintage-engine'
}
}
test {
useJUnitPlatform()
}
HandlingFormSubmissionApplication. java
package com.example.handlingformsubmission;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@ComponentScan(basePackages = {"com.example.handlingformsubmission.greeting"})
@SpringBootApplication
public class HandlingFormSubmissionApplication {
public static void main(String[] args) {
SpringApplication.run(HandlingFormSubmissionApplication.class, args);
}
}
GreetingController. java
package com.example.handlingformsubmission.greeting;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PostMapping;
@Controller
public class GreetingController {
@GetMapping("/greeting")
public String greetingForm(Model model) {
model.addAttribute("greeting", new Greeting());
return "greeting";
}
@PostMapping("/greeting")
public String greetingSubmit(@ModelAttribute Greeting greeting, Model model) {
model.addAttribute("greeting", greeting);
return "result";
}
}
application.properties
server.port=8000
приветствие. html
<!DOCTYPE HTML>
<html xmlns:th="https://www.thymeleaf.org">
<head>
<title>Getting Started: Handling Form Submission</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<h1>Form</h1>
<form action="#" th:action="@{/greeting}" th:object="${greeting}" method="post">
<p>Id: <input type="text" th:field="*{id}" /></p>
<p>Message: <input type="text" th:field="*{content}" /></p>
<p><input type="submit" value="Submit" /> <input type="reset" value="Reset" /></p>
</form>
</body>
</html>
результат. html
<!DOCTYPE HTML>
<html xmlns:th="https://www.thymeleaf.org">
<head>
<title>Getting Started: Handling Form Submission</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<h1>Result</h1>
<p th:text="'id: ' + ${greeting.id}" />
<p th:text="'content: ' + ${greeting.content}" />
<a href="/greeting">Submit another message</a>
</body>
</html>