springboot小练习

springbootdemo/pom.xml

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+<?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.itheima</groupId>
+    <artifactId>springbootdemo</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.0.2.RELEASE</version>
+    </parent>
+
+    <properties>
+        <java.version>1.8</java.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <!-- springBoot JPA的起步依赖 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+        <!-- MySQL连接驱动 -->
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+        </dependency>
+        <!--freemarker-->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-freemarker</artifactId>
+        </dependency>
+        <!--mybatis起步依赖-->
+        <dependency>
+            <groupId>org.mybatis.spring.boot</groupId>
+            <artifactId>mybatis-spring-boot-starter</artifactId>
+            <version>1.1.1</version>
+        </dependency>
+
+        <!--测试的起步依赖-->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <!-- 配置使用redis启动器 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-redis</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <resources>
+            <resource>
+                <directory>src/main/java</directory>
+                <includes>
+                    <include>**/*.properties</include>
+                    <include>**/*.xml</include>
+                </includes>
+                <filtering>false</filtering>
+            </resource>
+            <resource>
+                <directory>src/main/resources</directory>
+                <includes>
+                    <include>**/*.*</include>
+                </includes>
+                <filtering>false</filtering>
+            </resource>
+        </resources>
+    </build>
+
+
+</project>

springbootdemo/src/main/java/com/itheima/Application.java

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

springbootdemo/src/main/java/com/itheima/Entity/UserEntity.java

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+package com.itheima.Entity;
+
+import org.springframework.data.elasticsearch.annotations.Document;
+import org.springframework.data.elasticsearch.annotations.Field;
+import org.springframework.data.elasticsearch.annotations.FieldType;
+
+import javax.persistence.*;
+
+@Document(indexName = "springboot",type = "haha")
+public class UserEntity {
+    @Id
+    @Field(type = FieldType.Integer,store = true)
+    private Integer id;
+    @Field(type = FieldType.Text,store = true,analyzer = "ik_max_word")
+    private String username;
+    @Field(type = FieldType.Text,store = true,analyzer = "ik_max_word")
+    private String password;
+    @Field(type = FieldType.Text,store = true,analyzer = "ik_max_word")
+    private String name;
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public String toString() {
+        return "User{" +
+                "id=" + id +
+                ", username='" + username + '\'' +
+                ", password='" + password + '\'' +
+                ", name='" + name + '\'' +
+                '}';
+    }
+}

springbootdemo/src/main/java/com/itheima/component/BeansCreate.java

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+package com.itheima.component;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.sun.org.apache.regexp.internal.RE;
+import org.elasticsearch.client.Client;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
+
+@Configuration
+public class BeansCreate {
+
+    /**
+     * 将ObjectMapper作为一个bean交由spring管理
+     * @return
+     */
+    @Bean
+    public ObjectMapper createObjectMapper(){
+        return new ObjectMapper();
+    }
+
+    /*@Bean
+    public ElasticsearchTemplate elasticsearchTemplate(Client client) {
+        return new ElasticsearchTemplate(client);
+    }*/
+
+}

springbootdemo/src/main/java/com/itheima/controller/UserController.java

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+package com.itheima.controller;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.itheima.pojo.User;
+import com.itheima.service.UserMapperService;
+import com.itheima.service.UserService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.*;
+
+import java.io.IOException;
+import java.util.List;
+
+@Controller
+public class UserController {
+
+    @Autowired
+    private UserService userService;
+
+    @Autowired
+    private UserMapperService userMapperService;
+
+    @Autowired
+    private StringRedisTemplate redisTemplate;
+
+    @Autowired
+    private ObjectMapper objectMapper;
+
+    /**
+     * spring整合redis
+     * 配置文件中配置redis的端口和ip---也可以配置redis集群
+     * @param id
+     * @return
+     */
+    @RequestMapping("/user/{id}")
+    @ResponseBody
+    public User findById(@PathVariable int id) throws IOException {
+        //先从redis中取数据
+        String json = redisTemplate.opsForValue().get("user" + id);
+        //如果redis中部位不为null或者一个空串,则从redis中查数据
+        if (json!=null&&"".equals(json)){
+            //将json数据转换为字符串-->使用objectMapper转换(jackson下的)
+            User user = objectMapper.readValue(json, User.class);
+            return user;
+        }
+        //如果redis中没有数据则查询数据库
+        User user = userService.findById(id);
+        //并将数据缓存至redis中
+        redisTemplate.opsForValue().set("user"+id,objectMapper.writeValueAsString(user));
+        return user;
+    }
+
+    @RequestMapping("/user/page/list")
+    public String findAll(Model model){
+        List<User> userList = userService.findAll();
+        //将数据装入视图
+        model.addAttribute("userList",userList);
+        //返回对应视图解析器
+        return "user";
+    }
+
+    /**
+     * springboot整合mybatis
+     * 编写mybatis映射文件后，位置可以放在两个位置
+     * 1：当前mapper接口同级目录下  2:resources的相同目录下(///形式添加目录)
+     * 第二种无需解释，需要在springboot配置文件中配置mybatis的包扫描和别名映射(不必须)
+     * 第一种  默认在java目录下只编译源文件，想要编译xml文件需要在pom文件中添加build配置
+     *   还需要在springboot启动类中添加mapperscan注解扫描mybatis接口
+     * @param id
+     * @return
+     */
+    @RequestMapping("/user/m/{id}")
+    @ResponseBody
+    public User findUserById(@PathVariable int id){
+        User user = userMapperService.findById(id);
+        return user;
+    }
+}

springbootdemo/src/main/java/com/itheima/controller/testController.java

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+package com.itheima.controller;
+
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class testController {
+
+    @RequestMapping("/test")
+    public String testBoot(){
+        return "hello boot";
+    }
+}

springbootdemo/src/main/java/com/itheima/controller/ymlTestController.java

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+package com.itheima.controller;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ *
+ * 取yml文件的值有两种方法:
+ * 1.@Value("${person.age}") 2:@ConfigurationProperties注解
+ *
+ * ConfigurationProperties注解会将springboot的.yml配置文件中的信息
+ * 自动映射为实体类的属性
+ * 使用：prefix="配置文件中需要映射的key的前缀"
+ *
+ * 注意：需要添加get/set方法
+ */
+@RestController
+@ConfigurationProperties(prefix="person")
+public class ymlTestController {
+
+    //@Value("${person.age}")
+    private Integer age;
+    //@Value("${person.address}")
+    private String address;
+    //@Value("${person.job}")
+    private String job;
+
+    @RequestMapping("/person")
+    public Map test(){
+        HashMap map = new HashMap();
+
+        map.put("age",age);
+        map.put("address",address);
+        map.put("job",job);
+
+        return map;
+    }
+
+    public Integer getAge() {
+        return age;
+    }
+
+    public void setAge(Integer age) {
+        this.age = age;
+    }
+
+    public String getAddress() {
+        return address;
+    }
+
+    public void setAddress(String address) {
+        this.address = address;
+    }
+
+    public String getJob() {
+        return job;
+    }
+
+    public void setJob(String job) {
+        this.job = job;
+    }
+}

springbootdemo/src/main/java/com/itheima/dao/UserDao.java

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+package com.itheima.dao;
+
+import com.itheima.pojo.User;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface UserDao extends JpaRepository<User,Integer>{
+}

springbootdemo/src/main/java/com/itheima/mapper/UserMapper.java

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+package com.itheima.mapper;
+
+import com.itheima.pojo.User;
+import org.mybatis.spring.annotation.MapperScan;
+
+import java.util.List;
+
+
+public interface UserMapper {
+
+    User findById(int id);
+
+    List<User> findAll();
+}

springbootdemo/src/main/java/com/itheima/mapper/UserMapper.xml

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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.itheima.mapper.UserMapper">
+    <select id="findById" resultType="com.itheima.pojo.User">
+        select * from user where id=#{id}
+    </select>
+
+    <select id="findAll" resultType="com.itheima.pojo.User">
+        select * from user
+    </select>
+</mapper>