一、java web開發(fā)環(huán)境搭建
網(wǎng)上有很多教程,參考教程:http://www.cnblogs.com/Leo_wl/p/4752875.html
二、Spring boot搭建
1、Intellij idea菜單欄File->new->project。
2、選擇左側(cè)欄中spring initializr,右側(cè)選擇jdk版本,以及默認的Service URL,點擊next。
/3、然后填寫項目的Group、Artifact等信息,helloworld階段選默認就可以了,點擊next。
4、左側(cè)點擊Web,中間一側(cè)選擇Web,然后左側(cè)選擇SQL,中間一側(cè)選擇JPA、Mybatis、MYSQL(LZ數(shù)據(jù)庫用的是mysql,大家可以選擇其他DB),點擊next。
5、填寫Project name 等信息,然后點擊Finish。
至此,一個maven web項目就創(chuàng)建好了,目錄結(jié)構(gòu)如下:
這樣,Spring boot就搭建好了,pom.xml里已經(jīng)有了Spring boot的jar包,包括我們的mysql數(shù)據(jù)連接的jar包。Spring boot內(nèi)置了類似tomcat這樣的中間件,所以,只要運行DemoApplication中的main方法就可以啟動項目了。我們測試一下。
在src/main/java下新建目錄com/demo/entity/User。
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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">package com.demo.entity; public class User { private String name; public String getName() { return name;
} public void setName(String name) { this.name = name;
}
}</pre>
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相同目錄下新建com/demo/controller/TestBootController。
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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">package com.demo.controller; import com.demo.entity.User; import org.springframework.boot.autoconfigure.EnableAutoConfiguration; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController;
@RestController
@EnableAutoConfiguration
@RequestMapping("/testboot") public class TestBootController {
@RequestMapping("getuser") public User getUser() {
User user = new User();
user.setName("test"); return user;
}
}</pre>
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spring boot啟動DemoAplication是需要掃描它下面的Controller等類的,所以將DemoApplication移動到com/demo目錄下。還有就是Spring boot啟動默認是要加載數(shù)據(jù)源的,所以我們在src/main/resources下新建application.yml:
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<textarea style="margin: 0px; padding: 0px; list-style-type: none; list-style-image: none; font: 12px/1.5 "Courier New"; width: 689px; height: 403.2px;"></textarea>
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或者將pom.xml中加載數(shù)據(jù)源的jar包先注釋掉也可以。
<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">/<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.0</version>
</dependency>/</pre>
最終的目錄結(jié)構(gòu)如下,
啟動DemoApplication的main方法,訪問http://localhost:8080/testboot/getuser即可。
三、整合Mybatis
1、集成druid,使用連接池。pom.xml中添加:
<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;"><dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.0</version>
</dependency></pre>
最終的pom.xml文件:
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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;"><?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.arm</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.8.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project></pre>
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在application.yml中添加數(shù)據(jù)源、Mybatis的實體和配置文件位置。
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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">#默認使用配置
spring:
profiles:
active: dev
公共配置與profiles選擇無關(guān) mapperLocations指的路徑是src/main/resources
mybatis:
typeAliasesPackage: com.xdd.entity
mapperLocations: classpath:mapper/*.xml
開發(fā)配置
spring:
profiles: dev
datasource:
url: jdbc:mysql://localhost:3306/test
username: root
password: root
driver-class-name: com.mysql.jdbc.Driver
# 使用druid數(shù)據(jù)源
type: com.alibaba.druid.pool.DruidDataSource</pre>
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就這樣就整合完成了!我們測試一下。
用MyBatis Generator自動生成代碼,參考博文:http://blog.csdn.net/zhshulin/article/details/23912615 這里列一下自動生成的代碼。
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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">import com.xdd.entity.User; import org.springframework.stereotype.Component; public interface UserDao { int deleteByPrimaryKey(Integer id); int insert(User record); int insertSelective(User record);
User selectByPrimaryKey(Integer id); int updateByPrimaryKeySelective(User record); int updateByPrimaryKey(User record);
}</pre>
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UserMapper.xml
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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;"><?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.xdd.dao.UserDao" >
<resultMap id="BaseResultMap" type="com.xdd.entity.User" >
<id column="id" property="id" jdbcType="INTEGER" />
<result column="user_name" property="userName" jdbcType="VARCHAR" />
<result column="password" property="password" jdbcType="VARCHAR" />
<result column="age" property="age" jdbcType="INTEGER" />
</resultMap>
<sql id="Base_Column_List" > id, user_name, password, age </sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" > select <include refid="Base_Column_List" /> from user_t
where id = #{id,jdbcType=INTEGER} </select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" > delete from user_t
where id = #{id,jdbcType=INTEGER} </delete>
<insert id="insert" parameterType="com.xdd.entity.User" > insert into user_t (id, user_name, password,
age)
values (#{id,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},
#{age,jdbcType=INTEGER}) </insert>
<insert id="insertSelective" parameterType="com.xdd.entity.User" > insert into user_t <trim prefix="(" suffix=")" suffixOverrides="," >
<if test="id != null" > id, </if>
<if test="userName != null" > user_name, </if>
<if test="password != null" > password, </if>
<if test="age != null" > age, </if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
<if test="id != null" > #{id,jdbcType=INTEGER}, </if>
<if test="userName != null" > #{userName,jdbcType=VARCHAR}, </if>
<if test="password != null" > #{password,jdbcType=VARCHAR}, </if>
<if test="age != null" > #{age,jdbcType=INTEGER}, </if>
</trim>
</insert>
<update id="updateByPrimaryKeySelective" parameterType="com.xdd.entity.User" > update user_t <set >
<if test="userName != null" > user_name = #{userName,jdbcType=VARCHAR}, </if>
<if test="password != null" > password = #{password,jdbcType=VARCHAR}, </if>
<if test="age != null" > age = #{age,jdbcType=INTEGER}, </if>
</set> where id = #{id,jdbcType=INTEGER} </update>
<update id="updateByPrimaryKey" parameterType="com.xdd.entity.User" > update user_t
set user_name = #{userName,jdbcType=VARCHAR},
password = #{password,jdbcType=VARCHAR},
age = #{age,jdbcType=INTEGER}
where id = #{id,jdbcType=INTEGER} </update>
</mapper></pre>
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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">public class User { private Integer id; private String userName; private String password; private Integer age; 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 == null ? null : userName.trim();
} public String getPassword() { return password;
} public void setPassword(String password) { this.password = password == null ? null : password.trim();
} public Integer getAge() { return age;
} public void setAge(Integer age) { this.age = age;
}
}</pre>
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最后將DemoApplication.java修改一下,讓其掃描dao層接口。
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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.web.support.SpringBootServletInitializer;
@SpringBootApplication
@MapperScan("com.xdd.dao") public class DemoApplication extends SpringBootServletInitializer{ public static void main(String[] args) {
SpringApplication.run(DemoApplication.class,args);
}
}</pre>
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自己添加controller和service
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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">import java.util.List; import java.util.Map; public interface UserService { public User getUserById(int userId); boolean addUser(User record);
}</pre>
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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import javax.annotation.Resource; import java.util.List; import java.util.Map;
@Service("userService") public class UserServiceImpl implements UserService {
@Resource private UserDao userDao; public User getUserById(int userId) { return userDao.selectByPrimaryKey(userId);
} public boolean addUser(User record){ boolean result = false; try {
userDao.insertSelective(record);
result = true;
} catch (Exception e) {
e.printStackTrace();
} return result;
}
}</pre>
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<pre style="margin: 0px; white-space: pre-wrap; overflow-wrap: break-word; padding: 0px; list-style-type: none; list-style-image: none; font-family: "Courier New" !important; font-size: 12px !important;">@Controller
@RequestMapping("/user") public class UserController {
@Resource private UserService userService;
@RequestMapping("/showUser")
@ResponseBody public User toIndex(HttpServletRequest request, Model model){ int userId = Integer.parseInt(request.getParameter("id"));
User user = this.userService.getUserById(userId); return user;
}
}</pre>
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瀏覽器訪問http://localhost:8080/user/showUser?id=1