Java @RequestMapping spring boot不支持';t按预期运行
我试图创建一个简单的应用程序,将“Hello World”打印到8080端口 以下是我的主要java类:Java @RequestMapping spring boot不支持';t按预期运行,java,spring,spring-boot,maven,pom.xml,Java,Spring,Spring Boot,Maven,Pom.xml,我试图创建一个简单的应用程序,将“Hello World”打印到8080端口 以下是我的主要java类: package com.iz.backend; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.web.bind.annotation.Reque
package com.iz.backend;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
@SpringBootApplication
public class BackendApplication {
@RequestMapping("/")
public String helloWorld() {
return "Hello World";
}
public static void main(String[] args) {
SpringApplication.run(BackendApplication.class, args);
}
}
代码编译成功,应用程序构建成功,但当我转到localhost:8080时
我得到404错误:
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Mon Jan 11 21:18:51
There was an unexpected error (type=Not Found, status=404).
我的pom.xml有什么问题吗?以下是pom文件:
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.4.1</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.iz</groupId>
<artifactId>backend</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>backend</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<version>2.4</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
4.0.0
org.springframework.boot
spring启动程序父级
2.4.1
com.iz
后端
0.0.1-快照
后端
SpringBoot的演示项目
11
org.apache.maven.plugins
maven源插件
2.4
org.springframework.boot
SpringBootStarterWeb
org.springframework.boot
弹簧启动机aop
org.springframework.boot
弹簧靴开发工具
符合事实的
org.springframework.boot
弹簧起动试验
编写
org.springframework.boot
弹簧靴起动器执行器
org.apache.maven.plugins
maven编译器插件
2.3.2
1.8
1.8
org.springframework.boot
springbootmaven插件
添加到@Reimeus answer
确保将MyController类和后端应用程序类保留在主包中,即,com.iz.backend
|-src/main/java
|--com.iz.backend
|--controllers
|--MyController
|--BackendApplication
或者,使用basePackages:
@SpringBootApplication(scanBasePackages = {"com.iz.backend"})
现在我可以在8080上看到我的Hello World了。但是,当我进行更改(例如:“Hello World 123”)保存并刷新页面时,我应该立即看到它。但是我没有看到任何更改..无论何时对代码进行任何更改,都必须重新运行项目。谢谢。我认为如果我使用SpringBootDevTools依赖项,那么就不需要重新运行代码。那不是真的吗?这是我的推荐信:是的,没错。参考:谢谢,你能不能也参考一下?请添加有关开发工具的相关标签。