java Spring Boot 404 未找到错误
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/47729310/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Spring Boot 404 not found error
提问by Harshit Shrivastava
I am trying to run the spring boot application but getting the 404 not found error.
我正在尝试运行 Spring Boot 应用程序，但出现 404 not found 错误。
Project structure:
项目结构：
src/
+- main/
+- java/
| + com/
| + demo/
| SpringBootDemo.java
| + controller/
| HomeController.java
+- resources/
| application.yml
src/
+- main/
+- webapp/
+- WEB-INF/
+- pages/
| home.jsp
HomeController.java
主控制器.java
package com.demo.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
@Controller
public class HomeController {
@GetMapping("/")
public String getHome() {
System.out.println("Controller");
return "home";
}
}
application.yml
应用程序.yml
server:
port: 8080
spring:
mvc:
view:
prefix: /WEB-INF/pages/
suffix: .jsp
build.gradle
构建.gradle
buildscript {
ext {
springBootVersion = '1.5.6.RELEASE'
}
repositories {
mavenCentral()
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
apply plugin: 'application'
mainClassName = 'com.demo.SpringBootDemo'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8
// In this section you declare where to find the dependencies of your project
repositories {
mavenCentral()
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-web')
testCompile('org.springframework.boot:spring-boot-starter-test')
compile('org.springframework.boot:spring-boot-starter-parent')
compile('javax.servlet.jsp.jstl:javax.servlet.jsp.jstl-api')
}
jar {
manifest {
attributes(
'Main-Class': 'com.demo.SpringBootDemo'
)
}
}
SpringBootDemo.java
SpringBootDemo.java
package com.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
@SpringBootApplication(scanBasePackages="com.demo")
public class SpringBootDemo {
public static void main(String[] args) {
SpringApplication.run(SpringBootDemo.class, args);
}
}
home.jsp
主页.jsp
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Hello</title>
</head>
<body>
Hello World
</body>
</html>
When I try to execute the code, it shows in the output as
当我尝试执行代码时，它在输出中显示为
Controller
But it gives the Whitelabel Error Pagewhen I visit http://localhost:8080/
但是Whitelabel Error Page当我访问http://localhost:8080/时它给出了
回答by Ivonet
UPDATEOk I'll try to do better. It was not my intention to do you wrong...
更新好的，我会努力做得更好。我不是有意要冤枉你...
I think you need to extend the SpringBootApplication class from SpringBootServletInitializerto get servlet functionality in your Spring Boot application
我认为您需要扩展 SpringBootApplication 类 SpringBootServletInitializer才能在 Spring Boot 应用程序中获得 servlet 功能
@SpringBootApplication
public class WebApplication extends SpringBootServletInitializer {
public static void main(String[] args) throws Exception {
SpringApplication.run(WebApplication.class, args);
}
}
In order to be able to resolve the view you have to define these properties:
为了能够解析视图，您必须定义这些属性：
spring.mvc.view.prefix: /WEB-INF/pages
spring.mvc.view.suffix: .jsp
or of course the yamlvariant of them. The actual jsp pages need then be placed in src/main/webapp/WEB-INF/pages
或者当然yaml是它们的变体。实际的jsp页面需要放在src/main/webapp/WEB-INF/pages
These are the dependencies in my pom
这些是我的 pom 中的依赖项
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
I hope you can translate this to gradle yourself?
我希望你能把这个翻译成自己的 gradle 吗？
My sample controller looks like this:
我的示例控制器如下所示：
@Controller
public class HelloController {
@RequestMapping("/")
public String hello(Model model, @RequestParam(value="name", required=false, defaultValue="World") String name) {
model.addAttribute("name", name);
return "hello";
}
}
Hope this will help you with getting your app working...
希望这可以帮助您让您的应用程序正常工作...
回答by Techflash
Run with maven spring boot goal: spring-boot:run
使用 maven spring boot 目标运行： spring-boot:run
Steps to setup maven configuration in IntelliJ:
在 IntelliJ 中设置 maven 配置的步骤：
Debug/Run Configuration | Click on + button visible at top left | Select Maven | Set command line to spring-boot:run
调试/运行配置 | 单击左上角可见的 + 按钮 | 选择 Maven | 将命令行设置为spring-boot:run
