java – Spring Boot Controller 404

我在Spring Boot中相当新,并试图构建一个简单的Web应用程序.我已经定义了一个包含我的url映射的控制器类,但是在浏览器上它给了我一个白标签页错误(404).我无法理解为什么它无法映射.我已经尝试更改我的组件扫描基础包,但它仍然没有将我重定向到页面“abc”或在控制台中打印“控制器”.

的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>bms</groupId>
    <artifactId>com.wellmanage.bms</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>BMS</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.3.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>


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

控制器类

package com.wellmanage.controller;   

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class BookController {

    @RequestMapping("/")
    public String hello() {
        System.out.println("in controller");
        return "abc";
    }
}

主要课程

package com.wellmanage.bms;

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

@SpringBootApplication
public class BmsApplication {

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

解决方法:

BmsApplication类位于com.wellmanage.bms包下,默认情况下,@ SpringBootApplication注释使用此包作为根运行组件扫描.由于BookController在com.wellmanage.controller中,因此默认配置会省略该包.

您有两种选择：

>更改默认组件扫描设置并设置要扫描的包：

    @ComponentScan("com.wellmanage")
    @SpringBootApplication
    public class BmsApplication {

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

>将主Application类移动到您应用的root包,以便您要自动扫描的所有组件都在其包下,例如com.wellmanage.

从您发布的配置中,您似乎没有设置任何模板引擎.因此忽略从控制器返回字符串“abc”.

标签：java,spring,controller,pom-xml,spring-boot-2
来源： https://codeday.me/bug/20190713/1453412.html