Java SpringBoot的RequestMapping不工作_Java_Spring_Spring Boot

Java SpringBoot的RequestMapping不工作

java spring spring-boot

Java SpringBoot的RequestMapping不工作,java,spring,spring-boot,Java,Spring,Spring Boot,我正在学习用于构建应用程序的SpringBoot。我正在尝试构建我的第一个Spring Boot应用程序，在不同的包中使用一个控制器作为应用程序。Tomcat实例出现，但请求未到达为URI注册的RestController 以下是控制器类： package com.spring.controllers; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bi

我正在学习用于构建应用程序的SpringBoot。我正在尝试构建我的第一个Spring Boot应用程序，在不同的包中使用一个控制器作为应用程序。Tomcat实例出现，但请求未到达为URI注册的RestController

以下是控制器类：

package com.spring.controllers;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @RequestMapping(value = "/abc")
    public String getHi() {
        System.out.println("End Point hit");
        return "Hi";
    }
}

以下是应用程序类：

package com.spring.boot;

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

@SpringBootApplication(scanBasePackages = {"com.spring.controllers"})
public class SpringBootMain {

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

Pom.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>RandomProjects</groupId>
<artifactId>SpringBoot</artifactId>
<version>1.0-SNAPSHOT</version>

<properties>
    <java.version>1.8</java.version>
</properties>

<build>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.3.2</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>exec-maven-plugin</artifactId>
            <version>1.6.0</version>
            <configuration>
                <mainClass>com.spring.boot.SpringBootMain</mainClass>
            </configuration>
        </plugin>
    </plugins>
</build>

<dependencies>

    <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-parent -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.RELEASE</version>
        <type>pom</type>
    </dependency>



    <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <version>1.5.6.RELEASE</version>
    </dependency>


</dependencies>


4.0.0
随机项目
):
出现意外错误（类型=未找到，状态=404）。
没有可用的消息
还有其他人面临同样的问题吗？请建议您如何解决此问题。
评论中提到的人尝试添加基本包
@SpringBootApplication(scanBasePackages = {"com.spring"})

或
但是为什么不使用这个spring初始化器从头创建一个spring启动项目呢。您还可以添加所需的任何依赖项
以下是我试图从您的示例中复制的迷你控制器：
SpringApplication
package com.example.demo.app;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@ComponentScan("com.example.demo.controller")
public class DemoApplication {

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

控制器
package com.example.demo.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @RequestMapping(value = "/abc")
    public String getHi() {
        System.out.println("End Point hit");
        return "Hi";
    }
}

pom.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>1.5.9.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>1.8</java.version>
    </properties>

    <dependencies>
        <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>


4.0.0
com.example
演示
0.0.1-快照
罐子
演示
SpringBoot的演示项目
org.springframework.boot
spring启动程序父级
1.5.9.1发布
UTF-8
UTF-8
1.8
org.springframework.boot
SpringBootStarterWeb
org.springframework.boot
弹簧起动试验
测试
org.springframework.boot
springbootmaven插件

而且效果很好
 建议尝试调用默认执行器端点，例如http://localhost:8080/error
。他们提供了Spring引导，并将显示您服务的实际状态
 将您的父版本号更改为以下：
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>


org.springframework.boot
spring启动程序父级
1.5.9.1发布
您的控制器应该在SpringBootApplication的子包中。
e、 g如果SpringbootApplication主方法在com.text.demo包下，那么控制器类应该在com.text.demo.Controller下
或添加
Spring boot应用程序主类上的组件扫描（“com.text.demo.controller”）。

您是如何到达控制器的？当应用程序启动时，spring boot会列出所有的请求映射。看到映射了吗？尝试将SpringBootMain类移动到com.spring包而不是com.spring.boot（名称空间heriarchy和visibility）。spring boot默认扫描所有子包。将SpringBootMain移动到com.spring并删除不必要的scanBasePackages。会成功的，你就是那个人！这一小时我一直在苦苦挣扎。谢谢你，这就是我错过的

<?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>1.5.9.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>1.8</java.version>
    </properties>

    <dependencies>
        <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>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.9.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>