Spring Boot 学习笔记（三）Spring boot 中的SSM

Spring boot 下的 Spring mvc

@Controller：即为Spring mvc的注解，处理http请求；

@RestController：Spring4后新增注解，是@Controller与@ResponseBody的组合注解，用于返回字符串或json数据；

package com.example.springbootweb.model;public class User {private int id;private String name;public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}
}

package com.example.springbootweb.controller;import com.example.springbootweb.model.User;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;@RestController
public class MVCController {@RequestMapping("/boot/getUser")public Object getUser(){User user =new User();user.setId(100);user.setName("王卫");return  user;}
}

@GetMapping：RequestMapping 和 Get请求方法的组合；

    //旧@RequestMapping(value = "/boot/getUser", method = RequestMethod.GET)//新@GetMapping("/boot/getUser")

@PostMapping：RequestMapping 和 Post请求方法的组合；

@PutMapping：RequestMapping 和 Put请求方法的组合；

@DeleteMapping：RequestMapping 和 Delete请求方法的组合；

Spring boot 使用 JSP

pom.xml 添加依赖项

  <!--引入Spring Boot内嵌的Tomcat对JSP的解析包--><dependency><groupId>org.apache.tomcat.embed</groupId><artifactId>tomcat-embed-jasper</artifactId></dependency><!-- servlet依赖的jar包start --><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId></dependency><!-- jsp依赖jar包 --><dependency><groupId>javax.servlet.jsp</groupId><artifactId>javax.servlet.jsp-api</artifactId><version>2.3.1</version></dependency><!--jstl标签依赖的jar包 --><dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId></dependency></dependencies>

application.properties 添加配置

#前端视图展示jsp
spring.mvc.view.prefix=/
spring.mvc.view.suffix=.jsp

pom.xml build中要配置备注中的配置信息

<build><plugins><!--springboot提供的项目编译打包插件--><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins><!--jsp打包编译--><resources><resource><directory>src/main/java</directory><includes><include>**/*.xml</include></includes></resource><resource><directory>src/main/resources</directory><includes><include>**/*.*</include></includes></resource><resource><directory>src/main/webapp</directory><targetPath>META-INF/resources</targetPath><includes><include>**/*.*</include></includes></resource></resources></build>

新建 Controller

package com.example.springbootweb.controller;import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;@Controller
public class JSPController {@GetMapping("/boot/index")public String index(Model model){model.addAttribute("msg","springboot 集成 jsp");return "index";}
}

在main文件下建立webapp文件

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Title</title>
</head>
<body>
${msg}
</body>
</html>

Spring boot 集成 MyBatis

1、在pom.xml中配置相关jar依赖。

<!-- 加载mybatis整合springboot -->
<dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.1</version>
</dependency><!-- MySQL的jdbc驱动包 -->
<dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId>
</dependency>

2、在Springboot的核心配置文件 application.properties 中配置MyBatis的Mapper.xml文件所在位置：

#配置MyBatis的Mapper.xml文件所在位置
mybatis.mapper-locations=classpath:com/example/springbootweb/mapper/*.xml

3、在Springboot的核心配置文件application.properties中配置数据源：

spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test_db?useUnicode=true&characterEncoding=utf8&useSSL=false

4、在MyBatis的Mapper接口中添加@Mapper注解或者在运行的主类上添加 @MapperScan("com.bjpowernode.springboot.mapper") 注解包扫描