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java SpringBoot MVC模板未加载（未找到404）

9 月 Questions & Answers

我这里有一个非常简单的Spring Boot MVC应用程序，它不工作。一个控制器的一页没有加载和接收404找不到

我设置了一个系统。出来控制器方法中的println（“主页”）语句，并验证它已映射并被正确触发，但模板未加载

错误是：

Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Thu Nov 06 23:43:51 EST 2014
There was an unexpected error (type=Not Found, status=404).

文件夹结构：

src/main/java
 +-Application.java
 +-WebController.java

src/main/resources
 +-templates
   +-index.html

缩写控制台输出：

Server initialized with port: 8080
Starting service Tomcat
Starting Servlet Engine: Apache Tomcat/7.0.55
Initializing Spring embedded WebApplicationContext
Root WebApplicationContext: initialization completed in 1947 ms
Mapping servlet: 'dispatcherServlet' to [/]
Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
Mapped "{[/],methods=[],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto public java.lang.String app.WebController.index()
Tomcat started on port(s): 8080/http
Started Application in 5.552 seconds (JVM running for 6.366)
Home Page
Home Page
Home Page

配置：

@EnableAutoConfiguration
@Configuration
@ComponentScan
public class Application extends WebMvcConfigurerAdapter {
    public static void main(String[] args) {
         ConfigurableApplicationContext context = SpringApplication.run(Application.class);
    }
}

控制器：

@Controller
public class WebController {
    @RequestMapping(value="/")
    public String index(){
        System.out.println("Home Page");
        return "index";
    }
}

索引。html:

<!DOCTYPE html>
<html lang="en">
<body>
 <h1>Hello</h1>    
</body>
</html>

我这里有一个非常简单的Spring Boot MVC应用程序，它不工作。一个控制器的一页没有加载和接收404找不到

我设置了一个系统。出来控制器方法中的println（“主页”）语句，并验证它已映射并被正确触发，但模板未加载

错误是：

Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Thu Nov 06 23:43:51 EST 2014
There was an unexpected error (type=Not Found, status=404).

文件夹结构：

src/main/java
 +-Application.java
 +-WebController.java

src/main/resources
 +-templates
   +-index.html

缩写控制台输出：

Server initialized with port: 8080
Starting service Tomcat
Starting Servlet Engine: Apache Tomcat/7.0.55
Initializing Spring embedded WebApplicationContext
Root WebApplicationContext: initialization completed in 1947 ms
Mapping servlet: 'dispatcherServlet' to [/]
Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
Mapped "{[/],methods=[],params=[],headers=[],consumes=[],produces=[],custom=[]}" onto public java.lang.String app.WebController.index()
Tomcat started on port(s): 8080/http
Started Application in 5.552 seconds (JVM running for 6.366)
Home Page
Home Page
Home Page

配置：

@EnableAutoConfiguration
@Configuration
@ComponentScan
public class Application extends WebMvcConfigurerAdapter {
    public static void main(String[] args) {
         ConfigurableApplicationContext context = SpringApplication.run(Application.class);
    }
}

控制器：

@Controller
public class WebController {
    @RequestMapping(value="/")
    public String index(){
        System.out.println("Home Page");
        return "index";
    }
}

索引。html:

<!DOCTYPE html>
<html lang="en">
<body>
 <h1>Hello</h1>    
</body>
</html>

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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.App</groupId>
    <artifactId>App</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <name>App</name>
    <description>App</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.1.8.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>   
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <version>1.4.181</version>
        </dependency>
        <!--dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-redis</artifactId>
        </dependency--> 
        <dependency>
            <groupId>com.firebase</groupId>
            <artifactId>firebase-client</artifactId>
            <version>1.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-library</artifactId>
            <version>2.10.4</version>
        </dependency>
    </dependencies>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <start-class>App.Application</start-class>
        <java.version>1.7</java.version>
    </properties>

    <repositories>
        <repository>
            <id>spring-releases</id>
            <name>Spring Releases</name>
            <url>http://repo.spring.io/libs-release</url>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-releases</id>
            <name>Spring Releases</name>
            <url>http://repo.spring.io/libs-release</url>
        </pluginRepository>
    </pluginRepositories>   

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

</project>

共 (4) 个答案

  1. # 1 楼答案

    尝试从这个网站http://start.spring.io/创建一个spring boot项目，它是一个spring初始值设定项，用于使用spring boot创建maven项目。添加web和Eleaf依赖项并生成一个项目。将该项目作为maven项目导入IDE，或使用Spring工具套件

    演示应用程序。爪哇：

    @Controller
@SpringBootApplication
public class DemoApplication {
  public static void main(String[] args) {
    SpringApplication.run(DemoApplication.class, args);
  }
  @RequestMapping(value = "/homepage" , method = RequestMethod.GET  )
  public String sample()
  {
    return "home";
  }
}

    波姆。xml:

    <?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">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.2.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.7</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

    回家。html:

    <!DOCTYPE html>

<html>
<head>
    <meta charset="UTF-8"></meta>
    <title>HomePage</title>
</head>
<body>
    <h1>MY Spring Boot Home Page</h1>
</body>
</html>
  2. # 2 楼答案

    这是一个边缘案例和意外。但是，这可能是一个原因

    确保没有在application.properties中更改静态资源路径，例如：

    spring.resources.static-locations=classpath:/META-INF/resources/,classpath:/META-INF/resources/webjars/

    我在使用这个属性进行SwaggerUI，它还有其他工作要做。 移除此属性有效

  3. # 3 楼答案

    看起来你的课程路径上没有Thymeleaf

    添加此依赖项：

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

    然后一切都会好起来

    如果您仍然面临一些问题，我建议您使用http://start.spring.io/创建新项目

  4. # 4 楼答案

    点击这个链接。给出了一个很好的例子 http://spring.io/guides/gs/handling-form-submission/

    src/main/java/hello/GreetingController。爪哇

    package hello;
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) {
        return "result";
    }
}

    src/main/resources/templates/greeting。html 

    <html xmlns:th="http://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>

    src/main/resources/templates/result。html

    <!DOCTYPE HTML>
<html xmlns:th="http://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>

    src/main/java/hello/Application。爪哇

    package hello;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application {

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

}