Spring Boot注解与资源文件配置

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1.不需要多余的配置文件信息

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application.properties
mybatis.type-aliases-package=com.mxxd.SCM.Dao
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml

spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/scm?useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password =

spring.freemarker.template-loader-path=classpath:/template/
spring.freemarker.suffix=.ftl
spring.freemarker.cache=false
spring.freemarker.charset=UTF-8

Dao层mapper 添加注解 @Repository

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@Repository
public interface UserMapper {

//@Select("SELECT * FROM `users` where user_username = #{username} and user_password = #{password}")
public UserEntity login(String username, String password);

public UserEntity queryUser(String name);

public boolean insert(UserEntity user);

public boolean update(UserEntity user);

public boolean delete(int id);

}

mapper.xml文件 添加对应mapper文件的位置

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<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.mxxd.SCM.Dao.UserMapper" >

<resultMap id="userMap" type="com.mxxd.SCM.Entity.UserEntity" >
<id column="user_id" property="id" />
<result column="user_username" property="username" />
<result column="user_password" property="password" />
<result column="user_name" property="name" />
<result column="user_phone" property="phone" />
<result column="user_email" property="email" />
<result column="user_address" property="address" />
<result column="user_authority" property="authority" />
<result column="is_login" property="is_login" />
</resultMap>

<select id="login" parameterType="String" resultMap="userMap">
  select *
  from users where user_username = #{0} and user_password = #{1}
   	</select>

<select id="queryUser" resultMap="userMap">
select *
from users
where 1=1
<if test="id !=0">
and user_id = #{id}
</if>
<if test="username !=null and username !='' ">
and user_username = #{username}
</if>
<if test="password !=null and password !='' ">
and user_password = #{password}
</if>
<if test="name !=null and name !='' ">
and user_name like "%" #{name}"%"
</if>
</select>

<insert id="insert" parameterType="com.mxxd.SCM.Entity.UserEntity" >
   INSERT INTO
  users
  (user_username,user_password,user_name,user_phone,user_email,user_address,user_authority,is_login)
   VALUES
  (#{username}, #{password}, #{name},#{phone},#{email},#{address},#{authority},#{is_login})
</insert>

<update id="update" parameterType="com.mxxd.SCM.Entity.UserEntity" >
UPDATE
users
SET
<if test="username != null and username != ''">user_username = #{username},</if>
<if test="password != null and password != ''">user_password = #{password},</if>
<if test="name != null and name != ''">user_name = #{name},</if>
<if test="phone != null and phone != ''">user_phone = #{phone},</if>
<if test="email != null and email != ''">user_email = #{email},</if>
<if test="address != null and address != ''">user_address = #{address},</if>
<if test="authority != null and authority != ''">user_authority = #{authority},</if>
WHERE
user_id = #{id}
</update>

<delete id="delete" parameterType="Integer" >
   DELETE FROM
   users
   WHERE
   user_id =#{0}
</delete>

</mapper>

Service层只需要一个service类即可 不需要一个接口一个实现类 添加注解 

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@Service
@Autowired 是指自动生成get和set方法
@Service
public class UserService {

@Autowired
private UserMapper userMapper;

public UserEntity login(String username, String password){
	UserEntity user = userMapper.login(username,password);
	return user;
	}

}

启动类添加注解 @MapperScan(“com.mxxd.SCM.Dao”)自动扫描Dao层mapper

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@SpringBootApplication
@MapperScan("com.mxxd.SCM.Dao")
public class ScmApplication {

   public static void main(String[] args) {
   	SpringApplication.run(ScmApplication.class, args);
   }
}

2.前端不推荐jsp，推荐thymeleaf或freemarker

使用freemarker
pom.xml文件添加依赖

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<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>

前端使用 .ftl 文件
在resources文件夹下创建两个目录：static 和 template
static：目录下创建css、js、img三个目录，存放静态资源文件
template：目录下存放 XX.ftl 文件
在com.mxxd.SCM目录下创建一个Conf目录，配置springboot的静态资源文件目录 

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   @Configuration
public class WebMvcConfig extends WebMvcConfigurerAdapter {

   @Override
   public void addResourceHandlers(ResourceHandlerRegistry registry) {
       registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
   }

   @Bean
   public HttpMessageConverter<String> responseBodyConverter() {
       StringHttpMessageConverter converter = new StringHttpMessageConverter(
               Charset.forName("UTF-8"));
       return converter;
   }

   @Override
   public void configureMessageConverters(
           List<HttpMessageConverter<?>> converters) {
       super.configureMessageConverters(converters);
       converters.add(responseBodyConverter());
   }

   @Override
   public void configureContentNegotiation(
           ContentNegotiationConfigurer configurer) {
       configurer.favorPathExtension(false);
   }
}

在 ftl 文件中如下引用

如果要引用其他页面，使用 <#include /> 

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<#include "header.ftl" encoding="UTF-8"/>

3.启动项目必须启动XXXApplication启动类

不能进行单元测试！！！ 因为需要等SpringBoot把所有的配置全部编译完成之后才能运行，不然会找不到BeanFactory

4.测试controller层调用service调用mapper连接数据库返回值是否正确

@Controller
@RequestMapping("/user")
public class UserController {

@Autowired
private UserService userService;

/*
* 启动之后访问 /user/test 会自动跳转到index.ftl
* 如果直接访问index.ftl是无法访问成功的
* 因为ftl文件是一个模板文件，需要经过后台跳转才能进行渲染成网页
*/
@RequestMapping("/test")
public String home(){
    return "index";
}

@RequestMapping("/home")
public ModelAndView login() {
    UserEntity userEntity = userService.login("admin", "admin");
    ModelAndView mv = new ModelAndView();
    if (userEntity == null) {
        mv.addObject("message", "用户名或密码错误，请重新输入！");
        mv.setViewName("index");
    } else {
    mv.addObject("user", userEntity);
    mv.setViewName("index");
    }
    System.out.println(userEntity);
    System.out.println(mv.getModel());
    System.out.println(mv.getViewName());
    return mv;
    }
}

直接在页面上进行测试，@Test 使用会报空指针错误
添加 @ResponseBody 注解不用返回页面，直接打印输出结果
前端直接使用 ${user.name} 获取user里name属性值 ${user}获取user整个对象值