[英]Spring Boot Controller 404
I am fairly new in Spring Boot and trying to build a simple web app. 我在Spring Boot中相当新,并试图构建一个简单的Web应用程序。 I have defined a controller class containing my mapping for url, but on browser it is giving me a white label page error(404).
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)。 I am not able to understand why it is not able to map.
我无法理解为什么它无法映射。 I have tried changing my component scan base package, but it still doesn't redirect me to page "abc" or print "in controller" in the console.
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”。
pom.xml 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>
Controller class 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";
}
}
Main class 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);
}
}
The BmsApplication
class is placed under the com.wellmanage.bms
package and by default the @SpringBootApplication
annotation runs component scan using this package as the root. 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。 Since the BookController
is inside com.wellmanage.controller
, the package is omitted by default configuration. 由于
BookController
在com.wellmanage.controller
,因此默认配置会省略该包。
You have two options: 您有两种选择:
@ComponentScan("com.wellmanage")
@SpringBootApplication
public class BmsApplication {
public static void main(String[] args) {
SpringApplication.run(BmsApplication.class, args);
}
}
com.wellmanage
. com.wellmanage
。 From the configuration you have posted, it seems you didn't set any template engine. 从您发布的配置中,您似乎没有设置任何模板引擎。 Returning the String "abc" from your controller is hence ignored.
因此忽略从控制器返回字符串“abc”。
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