Spring boot笔记

一、搭建demo

1.去http://start.spring.io/生成maven项目导入到eclipse，可以选择一些依赖，如：web、mybatis、mysql。项目结构如下：

注：jdk需要1.7以上；application.properties是主配置文件，里面配置注意检查空格

2.pom文件

<?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.lzj.test</groupId><artifactId>springbootDemo</artifactId><version>0.0.1-SNAPSHOT</version><packaging>war</packaging><name>springbootDemo</name><description>Demo project for Spring Boot</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.4.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><!-- 添加web模块 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><!-- 部署到外部tomcat 要排除spring-boot-starter-tomcat --><!-- <exclusions><exclusion><groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-tomcat</artifactId></exclusion></exclusions> --></dependency>    <!-- 测试 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!-- 支持热部署 --><dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-devtools</artifactId>             <optional>true</optional>         </dependency>        <!-- mysql驱动 -->        <dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><!-- 集合mybatis --><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.0</version></dependency>        <!-- jsp 支持  begin-->        <dependency>              <groupId>org.apache.tomcat.embed</groupId>              <artifactId>tomcat-embed-jasper</artifactId>             <scope>provided</scope>         </dependency>                   <dependency>           <groupId>javax.servlet</groupId>           <artifactId>jstl</artifactId>       </dependency>        <dependency>           <groupId>javax.servlet</groupId>           <artifactId>javax.servlet-api</artifactId>           <scope>provided</scope>       </dependency>       <!-- end -->               </dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

3.访问

写好Controller类后，运行主类main方法，浏览器输入http://localhost:8080/hello（不需要项目名，其hello是Controller映射访问路径）。启动主类如下：

package com.lzj.test.springbootDemo;import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@MapperScan("com.lzj.test.springbootDemo.mapper")@SpringBootApplicationpublic class SpringbootDemoApplication  {public static void main(String[] args) {SpringApplication.run(SpringbootDemoApplication.class, args);}}

注：@MapperScan不是必需的，是mybatis扫描接口注解

二、使用jsp页面

spring boot 不建议使用jsp，如果要使用jsp需要做几点改动：

1.pom添加额外依赖支持：tomcat-embed-jasper、javax.servlet-api、jstl，具体配置见上图pom配置。

2.在src/main下创建webapp/WEB-INF/jsp(jsp目录自定义)

3.在application.properties添加：

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

三、集成mybatis

1.pom加入mybatis的jar （mybatis-spring-boot-starter）和数据库驱动

2.编写mapper.xml和mybatis接口代码

3.在主启动类添加注解@MapperScan("com.lzj.test.springbootDemo.mapper")，指定扫描接口类包路径

4.在application.properties添加配置信息：

#指定mapper.xml位置mybatis.mapperLocations=classpath:mapper/*.xml#mybatis.typeAliasesPackage=com.lzj.test.springbootDemo.po#数据库链接信息  spring.datasource.url=jdbc:mysql://ip:port/dataBaseName?characterEncoding=utf8spring.datasource.username=namespring.datasource.password=pwdspring.datasource.driver-class-name=com.mysql.jdbc.Driver

四、部署到外部tomcat

1.修改maven打包方法

在pom.xml里设置 <packaging>war</packaging>

2.移除内嵌tomcat

在pom.xml里排除依赖spring-boot-starter-tomcat，见上图demo的pom配置，放开注释

3.修改启动类


修改启动类，继承 SpringBootServletInitializer 并重写 configure 方法。如本文的SpringbootDemoTomcat类

package com.lzj.test.springbootDemo;import org.springframework.boot.builder.SpringApplicationBuilder;import org.springframework.boot.web.support.SpringBootServletInitializer;public class SpringbootDemoTomcat extends SpringBootServletInitializer{@Override    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {        //注意这里要指向原先用main方法执行的SpringbootDemoApplication启动类return application.sources(SpringbootDemoApplication.class);    }}

4.maven打包，部署tomcat运行