Question

我正在IDEA（一个简单的springboot Web应用程序）的“ spring in action 4th”的ch21中运行代码。但这是行不通的，也不能解决百里香叶的问题。

我已将视图名称修改为html文件名，它可以工作。但是无法显示模型。

控制器

@Controller
@RequestMapping("/")
public class ContactController {

    private ContactRepository contactRepo;

    @Autowired
    public ContactController(ContactRepository contactRepo) {
        this.contactRepo = contactRepo;
    }

    @RequestMapping(method=RequestMethod.GET)
    public String home(Map<String,Object> model) {
        List<Contact> contacts = contactRepo.findAll();
        model.put("contacts", contacts);
        return "home";
    }

    @RequestMapping(method=RequestMethod.POST)
    public String submit(Contact contact) {
        contactRepo.save(contact);
        return "redirect:/";
    }
}

maven pom

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.4.RELEASE</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>
    <groupId>com.github.lxyscls.SpringInAction4th</groupId>
    <artifactId>SpringInAction4th-ch21</artifactId>
    <packaging>jar</packaging>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.thymeleaf</groupId>
            <artifactId>thymeleaf-spring4</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

我将html放在src / main / resources / templates下。

home.html

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
  <head>
    <title>Spring Boot Contacts</title>
    <link rel="stylesheet" th:href="@{/style.css}" />
  </head>

  <body>
    <h2>Spring Boot Contacts</h2>
    <form method="POST">
      <label for="firstName">First Name:</label>
      <input type="text" name="firstName"></input><br/>
      <label for="lastName">Last Name:</label>
      <input type="text" name="lastName"></input><br/>
      <label for="phoneNumber">Phone #:</label>
      <input type="text" name="phoneNumber"></input><br/>
      <label for="emailAddress">Email:</label>
      <input type="text" name="emailAddress"></input><br/>
      <input type="submit"></input>
    </form>

    <ul th:each="contact : ${contacts}">
      <li>
        <span th:text="${contact.firstName}">First</span>
        <span th:text="${contact.lastName}">Last</span> :
        <span th:text="${contact.phoneNumber}">phoneNumber</span>,
        <span th:text="${contact.emailAddress}">emailAddress</span>
      </li>
    </ul>
  </body>
</html>

错误日志如下。

17:03:23.339 [http-nio-8080-exec-2] DEBUG org.springframework.web.servlet.view.InternalResourceView - View name 'home', model {contacts=[]}
17:03:23.340 [http-nio-8080-exec-2] DEBUG org.springframework.web.servlet.view.InternalResourceView - Forwarding to [home]
17:03:23.342 [http-nio-8080-exec-2] DEBUG org.springframework.web.servlet.DispatcherServlet - "FORWARD" dispatch for GET "/home", parameters={}
17:03:23.345 [http-nio-8080-exec-2] DEBUG org.springframework.web.servlet.handler.SimpleUrlHandlerMapping - Mapped to ResourceHttpRequestHandler ["classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/", "/"]
17:03:23.346 [http-nio-8080-exec-2] DEBUG org.springframework.web.servlet.resource.ResourceHttpRequestHandler - Resource not found
17:03:23.346 [http-nio-8080-exec-2] DEBUG org.springframework.web.servlet.DispatcherServlet - Exiting from "FORWARD" dispatch, status 404
17:03:23.347 [http-nio-8080-exec-2] DEBUG org.springframework.web.servlet.DispatcherServlet - Completed 404 NOT_FOUND

Answer 1

错误日志显示您正在尝试向/home进行GET请求，但是在您的控制器类中看不到任何映射到/home的请求。您已将类级别的RequestMapping定义为/。您可以尝试调用http://localhost:8080，它将带您到home.html页面，也可以像下面这样将RequestMapping定义到home方法，然后尝试调用http://localhost:8080/home

 @RequestMapping(value = "/home", method=RequestMethod.GET)
public String home(Map<String,Object> model) {..}

SpringBoot应用程序无法解析百里香视图

1 个答案: