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

Spring boot 事务支持

1、在入口类中使用注解 @EnableTransactionManagement 开启事务支持；

2、在访问数据库的Service方法上添加注解 @Transactional 即可；

3、其实还是用spring 的事务管理。