SpringBoot的Web开发入门案例8—支持jsp

缺乏、安全感 2023-05-22 13:28 14阅读 0赞

1.  新建springboot工程：**springboot\_jsp**，打包方式为**war**  
    ![java.jpg][]
2.  导入web模块：  
    ![java.jpg][java.jpg 1]

生成的项目结构：  
![java.jpg][java.jpg 2]

包含启动类**SpringbootJspApplication**：

package com.example.demo;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class SpringbootJspApplication { 
    
    	public static void main(String[] args) { 
    		SpringApplication.run(SpringbootJspApplication.class, args);
    	}
    
    }

**ServletInitializer**类：

package com.example.demo;
    
    import org.springframework.boot.builder.SpringApplicationBuilder;
    import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
    
    public class ServletInitializer extends SpringBootServletInitializer { 
    
    	@Override
    	protected SpringApplicationBuilder configure(SpringApplicationBuilder application) { 
    		return application.sources(SpringbootJspApplication.class);
    	}
    
    }

**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 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>2.2.6.RELEASE</version>
    		<relativePath/> 
    	</parent>
    	<groupId>com.example</groupId>
    	<artifactId>springboot_jsp</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<packaging>war</packaging>
    	<name>springboot_jsp</name>
    	<description>Demo project for Spring Boot</description>
    
    	<properties>
    		<java.version>1.8</java.version>
    	</properties>
    
    	<dependencies>
    		<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>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    			<exclusions>
    				<exclusion>
    					<groupId>org.junit.vintage</groupId>
    					<artifactId>junit-vintage-engine</artifactId>
    				</exclusion>
    			</exclusions>
    		</dependency>
    	</dependencies>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    			</plugin>
    		</plugins>
    	</build>
    
    </project>

1.  在pom文件中添加支持jsp的依赖：

<dependency>
    	<groupId>org.apache.tomcat.embed</groupId>
    	<artifactId>tomcat-embed-jasper</artifactId>
    	<scope>provided</scope>
    </dependency>

1.  在 **webapp** 文件夹下新建 **WEB-INF** 文件夹，在 **WEB-INF** 下新建 **test.jsp**

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    	<h1>success</h1>
    </body>
    </html>

1.  新建HelloController类

package com.example.demo.controller;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.GetMapping;
    
    @Controller
    public class HelloController { 
    	
    	@GetMapping("/hello")
    	public String hello() { 
    		return "test";
    	}
    }

*  **application.properties**文件：

server.port=9000
    spring.mvc.view.prefix=/WEB-INF/
    spring.mvc.view.suffix=.jsp

*  将项目添加到tomcat容器中，启动tomcat，访问路径：http://localhost:9000/springboot\_jsp/hello，页面显示失败，再访问路径：http://localhost:8080/springboot\_jsp/hello，页面成功显示：  
    ![在这里插入图片描述][20200417224848923.png]  
    **这说明，使用外部tomcat时，在配置文件中配置的端口号server.port失效了。**
 *  修改test.jsp页面：

*  新建second.jsp

*  新增请求：

@GetMapping("/click")
    	public String click(Model model) { 
    		model.addAttribute("msg", "click---second.jsp");
    		return "second";
    	}

*  重启tomcat，请求http://localhost:8080/springboot\_jsp/hello  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JMVV8xMTE_size_16_color_FFFFFF_t_70]
 *  点击click链接，跳转至second.jsp，从Model中传递过来的值可正常显示：  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JMVV8xMTE_size_16_color_FFFFFF_t_70 1]  
    总结：

1.  创建一个 springboot/maven 工程，打包方式为**war**包
2.  要有一个ServletInitializer的类（继承**SpringBootServletInitializer**）
3.  在pom文件中增加jsp的依赖，修改tomcat启动器的scope
4.  调整目录结构，jsp页面要放在WEB-INF下，在application.properties/yml中配置页面的前后缀（视图解析）
5.  启动服务时，使用的是外部的容器

[java.jpg]: /images/20230521/84393bf3e61444e3bb4c0082c02e64d5.png
[java.jpg 1]: /images/20230521/3272c0c7d57f42fdaddf12efaed0f55a.png
[java.jpg 2]: /images/20230521/3fd843e8606f4a678312415243a7b83e.png
[20200417224848923.png]: /images/20230521/c153cf07838b439d9ba02363a70ea90f.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JMVV8xMTE_size_16_color_FFFFFF_t_70]: /images/20230521/44bfd86e50af4d78bb4d6127a4816829.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JMVV8xMTE_size_16_color_FFFFFF_t_70 1]: /images/20230521/c4b9614c23174c93907ac3c714723a1e.png