spring boot
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luoxiang
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# spring boot 整合 tomcat
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## 目录<br/>
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<a href="#一说明">一、说明</a><br/>
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<a href="#11-项目结构说明">1.1 项目结构说明</a><br/>
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<a href="#12-项目主要依赖">1.2 项目主要依赖</a><br/>
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<a href="#二整合-tomcat">二、整合 tomcat</a><br/>
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<a href="#21-修改启动类继承自SpringBootServletInitializer并覆盖重写其中configure方法">2.1 修改启动类，继承自SpringBootServletInitializer，并覆盖重写其中configure方法</a><br/>
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<a href="#22-在applicationyml-中指定访问视图文件的前缀和后缀">2.2 在application.yml 中指定访问视图文件的前缀和后缀 </a><br/>
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<a href="#23-新建controller和showjsp-测试整合是否成功">2.3 新建controller和show.jsp 测试整合是否成功</a><br/>
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## 正文<br/>
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## 一、说明
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#### 1.1 项目结构说明
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spring boot 整合 tomcat 后支持 jsp 的使用（内置容器默认是不支持 jsp），所以项目整合后采用 jspController 跳转到 show.jsp 测试整合是否成功。
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<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-boot-tomcat.png"/> </div>
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#### 1.2 项目主要依赖
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```xml
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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<!--排除内置容器依赖 使用外部 tomcat 容器启动-->
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<exclusions>
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<exclusion>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-tomcat</artifactId>
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</exclusion>
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</exclusions>
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</dependency>
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<dependency>
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<!--使用外置容器时候 SpringBootServletInitializer 依赖此包 -->
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<groupId>javax.servlet</groupId>
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<artifactId>servlet-api</artifactId>
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<version>2.5</version>
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<scope>provided</scope>
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</dependency>
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```
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## 二、整合 tomcat
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#### 2.1 修改启动类，继承自SpringBootServletInitializer，并覆盖重写其中configure方法
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```java
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/**
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* 如果用外置 tomcat,启动报错 java.lang.NoClassDefFoundError: javax/el/ELManager
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* 是因为 tomcat 7.0 el-api 包中没有 ELManager 类 , 切换 tomcat 为 8.0 以上版本即可
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*/
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@SpringBootApplication
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public class SpringBootTomcatApplication extends SpringBootServletInitializer {
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@Override
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protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
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//传入 SpringBoot 应用的主程序
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return application.sources(SpringBootTomcatApplication.class);
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}
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public static void main(String[] args) {
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SpringApplication.run(SpringBootTomcatApplication.class, args);
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}
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}
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```
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#### 2.2 在application.yml 中指定访问视图文件的前缀和后缀
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```yml
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spring:
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mvc:
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view:
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prefix: /WEB-INF/jsp/
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suffix: .jsp
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```
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#### 2.3 新建controller和show.jsp 测试整合是否成功
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```java
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@Controller
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@RequestMapping("index")
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public class JspController {
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@RequestMapping
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public String jsp(Model model){
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Programmer programmer = new Programmer("heibai", 21, 1298.31f, LocalDate.now());
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model.addAttribute("programmer",programmer);
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return "show";
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}
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}
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```
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```jsp
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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
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<html>
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<head>
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<title>programmer</title>
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<link rel="stylesheet" href="${pageContext.request.contextPath}/css/show.css">
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</head>
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<body>
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<ul>
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<li>姓名: ${programmer.name}</li>
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<li>年龄: ${programmer.age}</li>
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</ul>
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</body>
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</html>
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```
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# Spring Boot 整合 Tomcat
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<nav>
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<a href="#一项目说明">一、项目说明</a><br/>
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<a href="#11-项目结构">1.1 项目结构</a><br/>
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<a href="#12-基本依赖">1.2 基本依赖</a><br/>
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<a href="#二整合-Tomcat">二、整合 Tomcat</a><br/>
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<a href="#21-SpringBootServletInitializer">2.1 SpringBootServletInitializer</a><br/>
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<a href="#22-定义视图">2.2 定义视图</a><br/>
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<a href="#23-整合测试">2.3 整合测试</a><br/>
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</nav>
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## 一、项目说明
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### 1.1 项目结构
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Spring Boot 默认采用内置的 Web 容器，因此打成 JAR 包后就可以直接运行。但在某的时候，你可能还是需要使用 Tomcat 来运行和管理 Web 项目，因此本用例主要介绍 Spring Boot 与 Tomcat 的整合方式。另外 Spring Boot 内置的 Web 容器默认并不支持 JSP，所以可以使用跳转到 JSP 页面的方式来测试整合外部容器是否成功。
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<div align="center"> <img src="https://github.com/heibaiying/spring-samples-for-all/blob/master/pictures/spring-boot-tomcat.png"/> </div>
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### 1.2 基本依赖
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```xml
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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<!--排除内置容器依赖 使用外部 tomcat 容器启动-->
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<exclusions>
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<exclusion>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-tomcat</artifactId>
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</exclusion>
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</exclusions>
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</dependency>
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<dependency>
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<!--使用外置容器时候 SpringBootServletInitializer 依赖此包 -->
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<groupId>javax.servlet</groupId>
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<artifactId>servlet-api</artifactId>
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<version>2.5</version>
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<scope>provided</scope>
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</dependency>
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```
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## 二、整合 Tomcat
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### 2.1 SpringBootServletInitializer
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修改启动类，继承自 SpringBootServletInitializer，并覆盖重写其中 configure 方法：
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```java
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/**
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* 如果用外置 tomcat,启动报错 java.lang.NoClassDefFoundError: javax/el/ELManager
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* 是因为 tomcat 7.0 el-api 包中没有 ELManager 类 , 切换 tomcat 为 8.0 以上版本即可
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*/
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@SpringBootApplication
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public class SpringBootTomcatApplication extends SpringBootServletInitializer {
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@Override
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protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
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//传入 SpringBoot 应用的主程序
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return application.sources(SpringBootTomcatApplication.class);
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}
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public static void main(String[] args) {
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SpringApplication.run(SpringBootTomcatApplication.class, args);
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}
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}
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```
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### 2.2 定义视图
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在 application.yml 中指定访问视图文件的前缀和后缀：
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```yml
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spring:
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mvc:
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view:
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prefix: /WEB-INF/jsp/
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suffix: .jsp
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```
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### 2.3 整合测试
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新建 controller 和 show.jsp 测试整合是否成功：
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```java
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@Controller
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@RequestMapping("index")
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public class JspController {
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@RequestMapping
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public String jsp(Model model){
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Programmer programmer = new Programmer("heibai", 21, 1298.31f, LocalDate.now());
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model.addAttribute("programmer",programmer);
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return "show";
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}
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}
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```
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```jsp
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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
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<html>
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<head>
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<title>programmer</title>
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<link rel="stylesheet" href="${pageContext.request.contextPath}/css/show.css">
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</head>
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<body>
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<ul>
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<li>姓名: ${programmer.name}</li>
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<li>年龄: ${programmer.age}</li>
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</ul>
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</body>
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</html>
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```
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