小贝子编程

设置 Spring 引导 Servlet 初始值设定项时出现问题



我正在尝试使用Spring Boot设置一个简单的Web CRUD应用程序。我知道我应该是 spring boot servlet 初始化器，但在日志中，我怀疑它没有正常运行，因为它没有记录我写的内容。

最终目标是让我能够去 http://localhost:8080/LNU-Project/，以及.jsp展示的家。

这是github上的链接。 https://github.com/rjpruitt16/LNU-Project/tree/master/src/main

Web 应用初始值设定项.java

package com.project.LNUProject;
import com.project.LNUProject.config.WebConfig; import lombok.extern.slf4j.Slf4j; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.builder.SpringApplicationBuilder; import org.springframework.boot.web.servlet.support.SpringBootServletInitializer; import org.springframework.web.context.support.AnnotationConfigWebApplicationContext; import org.springframework.web.servlet.DispatcherServlet;
import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.ServletRegistration;
@Slf4j 
@SpringBootApplication 
public class WebAppInitializer extends SpringBootServletInitializer {
private static final String DISPATCHER_SERVLET_NAME = "dispatcher";
public static void main(String[] args) {
SpringApplication.run(WebAppInitializer.class, args);
}
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(WebAppInitializer.class);
}
@Override
public void onStartup(ServletContext servletContext) throws ServletException {
log.info("onStartUp");
// create the spring application context
AnnotationConfigWebApplicationContext context =
new AnnotationConfigWebApplicationContext();
context.register(WebConfig.class);
// create the dispatcher servlet
DispatcherServlet dispatcherServlet =
new DispatcherServlet(context);
// register and configure the dispatcher servlet
ServletRegistration.Dynamic registration =
servletContext.addServlet(DISPATCHER_SERVLET_NAME, dispatcherServlet);
registration.setLoadOnStartup(1);
registration.addMapping("/");
} }

网络配置.java

package com.project.LNUProject.config;
import com.project.LNUProject.utils.ViewNames;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.UrlBasedViewResolver;
@EnableWebMvc
@Configuration
@ComponentScan
@Slf4j
public class WebConfig implements WebMvcConfigurer {
// == constants ==
public static final String RESOLVER_PREFIX = "/WEB-INF/view/";
public static final String RESOLVER_SUFFIX =".jsp";
// == bean methods
@Bean
public ViewResolver viewResolver() {
UrlBasedViewResolver viewResolver = new InternalResourceViewResolver();
viewResolver.setPrefix(RESOLVER_PREFIX);
viewResolver.setSuffix(RESOLVER_SUFFIX);
return viewResolver;
}
@Override
public void addViewControllers(ViewControllerRegistry registry) {
log.info("registry add properly");
registry.addViewController("/").setViewName(ViewNames.HOME);
}
}

绒球.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.project</groupId>
<artifactId>LNU-Project</artifactId>
<version>0.0.1-SNAPSHOT</version>
<modules>
<module>Database</module>
<module>WEB</module>
</modules>
<packaging>pom</packaging>
<name>LNU-Project</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.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-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</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>
**<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.0</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.cargo</groupId>
<artifactId>cargo-maven2-plugin</artifactId>
<version>1.6.7</version>
<configuration>
<container>
<containerId>tomcat9x</containerId>
<type>embedded</type>
</container>
</configuration>
</plugin>
</plugins>**
</build>

</project>

请按照以下步骤在外部 tomcat 上部署 Spring 引导应用程序：

  1. 需要打包一个 WAR 应用程序而不是一个 JAR。为此，我们将pom.xml更改为以下内容：

    <packaging>war</packaging>

  2. 添加 Tomcat 依赖项：

    <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>

  3. 最后，我们通过实现SpringBootServletInitializer接口来初始化 Tomcat 所需的 Servlet 上下文：

    @SpringBootApplication
public class Application extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(Application.class);
}
public static void main(String[] args) throws Exception {
SpringApplication.run(Application.class, args);
}
}

https://docs.spring.io/spring-boot/docs/current/reference/html/howto-traditional-deployment.html

文档明确指出，您必须将包装标签从pom 更改为 pom中的战争.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.project</groupId>
<artifactId>LNU-Project</artifactId>
<version>0.0.1-SNAPSHOT</version>
<modules>
<module>Database</module>
<module>WEB</module>
</modules>
**<packaging>war</packaging>**
<name>LNU-Project</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.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-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</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>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.0</version>
<configuration>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
<plugin>
<groupId>org.codehaus.cargo</groupId>
<artifactId>cargo-maven2-plugin</artifactId>
<version>1.6.7</version>
<configuration>
<container>
<containerId>tomcat9x</containerId>
<type>embedded</type>
</container>
</configuration>
</plugin>
</plugins>
</build>

</project>

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