自己是Spring Boot
的初学者,开始看教程的时候发现基本上都是部署的 JSP
,但是按照教程一步步走下来始终无法成功,一直都是 404
:
查阅各种资料后,总结出一套 Spring Boot
支持 JSP
的流程:
添加依赖
在pom.xml
中添加两个依赖:tomcat-embed-jasper
(它提供了JSP
解析和执行的功能)和 javax.servlet-api
(它提供了对 JSP
所需的 Servlet API
的支持)。这是所需的 pom.xml
内容:
xml
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
要注意的是,将 pom.xml
文件的 packing
方式修改为 war
:
xml
<packaging>war</packaging>
配置主类
配置 SpringBootServletInitializer
子类以启用 JSP
支持。
java
package com.example.springfirst;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.actuate.autoconfigure.wavefront.WavefrontProperties;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
@SpringBootApplication
public class SpringFirstApplication extends SpringBootServletInitializer {
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(WavefrontProperties.Application.class);
}
public static void main(String[] args) {
SpringApplication.run(SpringFirstApplication.class, args);
}
}
常规内容
其它的配置,比如 mapping
应该和网上的一致,我就简单记录一下。
java
package com.example.springfirst.spittr.config;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
@Configuration
@ComponentScan(basePackages={"com.example.springfirst.spittr"})
public class RootConfig {
}
java
package com.example.springfirst.spittr.config;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
import com.example.springfirst.spittr.web.WebConfig;
public class SpitterWebInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
@Override
protected String[] getServletMappings() {
return new String[] { "/" };
}
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class<?>[] { RootConfig.class };
}
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class<?>[] { WebConfig.class };
}
}
java
package com.example.springfirst.spittr.web;
import static org.springframework.web.bind.annotation.RequestMethod.*;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import javax.annotation.PostConstruct;
@Controller
public class HomeController {
@PostConstruct
public void init() {
System.out.println("HomeController bean created");
}
@RequestMapping(value="/home", method = GET)
public String home() {
return "home";
}
}
java
package com.example.springfirst.spittr.web;
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.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
@Configuration
@EnableWebMvc
@ComponentScan("com.example.springfirst.spittr.web")
public class WebConfig implements WebMvcConfigurer {
@Bean
public ViewResolver viewResolver() {
InternalResourceViewResolver resolver = new InternalResourceViewResolver();
resolver.setPrefix("/WEB-INF/jsp/");
resolver.setSuffix(".jsp");
return resolver;
}
// @Override
// public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
// configurer.enable();
// }
}
附录
工程结构如下: