Spring Boot注解与资源文件配置

date: 2018-11-18 16:57:17

updated: 2018-11-18 16:57:17

1.不需要多余的配置文件信息

    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

    @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

    <?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

    @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

    @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

    <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

    @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 />

    <#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