荆棘从死亡中来，死亡又包含着新生。
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三、博客系统，Spring Boot + MyBatis

MyBatis 中文网站：http://www.mybatis.org/mybatis-3/zh/index.html

mybatis 是一个半自动化的 orm 框架，所谓半自动化就是 mybaitis 只支持数据库查出的数据映射到 pojo 类上，而实体到数据库的映射需要自己编写 sql 语句实现，相较于 hibernate 这种完全自动化的框架我更喜欢 mybatis，mybatis 非常灵活，可以随心所欲的编写自己的 sql 语句来实现复杂的数据库操作，还会有一种畅酣淋漓的编写 sql 语句的潇洒感，但是以前的 mybaits 需要一大堆的配置文件，以及各种 mapper 和 dao 和实体的关联，导致使用 mybatis 还是不够简洁，后来 mybatis 也发现了这个弊端，开发了 mybatis generator 工具来自动化生成实体类、mapper 配置文件、dao 层代码来减轻开发工作量，在后期也是实现了抛弃 mapper 配置文件基于注解的开发模式，直到现在，mybatis 看 spring boot 这么火热，也开发了一套基于 spring boot 的模式：mybatis-spring-boot-starter。
spring boot 简约轻巧的风格正在逐渐被越来越多的厂商及开发者所认可，包括阿里的开源 RPC 框架 dubbo 也准备开发一套对 spring boot 应用的支持（dubbo-spring-boot-starter 启动配置模块）

一、创建 Spring Boot 工程

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完整依赖：

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>1.3.2</version>
		</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>
		
		  <!-- 分页插件 -->
     <dependency>
         <groupId>com.github.pagehelper</groupId>
         <artifactId>pagehelper-spring-boot-starter</artifactId>
         <version>1.2.5</version>
     </dependency>
     <!-- alibaba的druid数据库连接池 -->
     <dependency>
         <groupId>com.alibaba</groupId>
         <artifactId>druid-spring-boot-starter</artifactId>
         <version>1.1.9</version>
     </dependency>
     
     <dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-thymeleaf</artifactId>
		</dependency>
	</dependencies>

二、创建 DAO、SERVICE、CONTROLLER、MODLE 和 MAPPER**

  1. 数据库创建脚本
create database blog;
use blog;
create table t_user(
    id BIGINT NOT NULL PRIMARY KEY AUTO_INCREMENT,
    username varchar(50),
    password varchar(50),
    create_time DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
);

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2.TUser

package com.pigplay.demo.model;

public class TUser {
	private Integer id;
	private String username;
	private String password;
	public TUser(Integer id, String username, String password) {
		super();
		this.id = id;
		this.username = username;
		this.password = password;
	}
	
	public TUser(String username, String password) {
		super();
		this.username = username;
		this.password = password;
	}

	public TUser(){}

	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;
	};
}

3.TUserDao 和 TUserMapper.xml

TUserDao

package com.pigplay.demo.dao;

import java.util.List;

import com.pigplay.demo.model.TUser;

public interface TUserDao {
	public void insertUser(TUser user);
	public List<TUser> selectUsers();
}

TUserMapper.xml

<?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.pigplay.demo.dao.TUserDao" >
  <resultMap id="BaseResultMap" type="com.pigplay.demo.model.TUser" >
    <id column="id" property="id" jdbcType="INTEGER" />
    <result column="username" property="username" jdbcType="VARCHAR" />
    <result column="password" property="password" jdbcType="VARCHAR" />
  </resultMap>
  
  <sql id="Base_Column_List" >
    id, username, password
  </sql>
  
  <insert id="insertUser" parameterType="com.pigplay.demo.model.TUser">
    INSERT INTO t_user (username, password) values(#{username}, #{password})
  </insert>

<select id="selectUsers" resultType="com.pigplay.demo.model.TUser">
    select 
    <include refid="Base_Column_List" />
    from t_user
</select>
</mapper>

4.UserController

package com.pigplay.demo.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import com.github.pagehelper.PageHelper;
import com.pigplay.demo.dao.TUserDao;
import com.pigplay.demo.model.TUser;
import com.pigplay.demo.service.TUserService;

@Controller
@RequestMapping("/user")
public class UserController {
	@Autowired
	private TUserService userService;
	
	@RequestMapping("/list")
    public String listUsers(Model model, Integer page) {
		page = page == null ? 1 : page;
		PageHelper.startPage(page, 2);
		List<TUser> u = userService.selectUsers();
		model.addAttribute("users", u);
        return "/user/list";
    }
	
	@RequestMapping("/add")
    public String add() {
        return "/user/add";
    }
	
	@RequestMapping("/save")
    public String save(Model model, String username, String password) {
		userService.insertUser(new TUser(username, password));
		PageHelper.startPage(1, 2);
		model.addAttribute("users", userService.selectUsers());
		return "/user/list";
    }
}

三、页面

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1.add.html

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8" />
<title>Insert title here</title>
</head>
<body>
  <h1>添加用户</h1>
  <form action="/user/save" method="post">
  <table>
  <tr>
  <td>用户名</td><td><input name="username" /></td>
  </tr>
  <tr>
  <td>密码</td><td><input name="password" /></td>
  </tr>
  </table>
  <input type="submit" value="保存" />
  </form>
</body>
</html>

2.list.html

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8" />
<title>Insert title here</title>
<script type="text/javascript">
function pager(p){
    window.location.href="/user/list?page=" + p	
}

</script>
</head>
<body>
  <h1>用户列表</h1>
  <div>
     <ul>
      <li>
             <span>id</span>-
             <span>用户名</span>-
             <span>密码</span>
         </li>
         
         <li th:each="user:${users}">
             <span th:text="${user.id}"></span>-
             <span th:text="${user.username}"></span>-
             <span th:text="${user.password}"></span>
         </li>
     </ul>
     <input type="button" onclick="pager(1)" value="上一页" />
     <input type="button" onclick="pager(2)" value="下一页" />
   </div>
</body>
</html>

四、application.yml

spring:
thymeleaf:
cache: false
suffix: .html
datasource:
name: test
url: jdbc:mysql://127.0.0.1:3306/blog
username: root
password: md123
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
filters: stat
maxActive: 20
initialSize: 1
maxWait: 60000
minIdle: 1
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: select 'x'
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
maxOpenPreparedStatements: 20

mybatis:
mapper-locations: classpath:mapper/*.xml
type-aliases-package: com.pigplay.demo.model

#pagehelper 分页插件
pagehelper:
helperDialect: mysql
reasonable: true
supportMethodsArguments: true
params: count=countSql

五、运行

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