如何生成项目的json静态文件

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                     如何生成项目的json静态文件

项目的静态文件，通常可用于缓存文件，避免数据的重复加载，提高运行速度。


文件命名规则：
                1级分类文件：class_1.js
                2级分类文件：以“class_2_”作为前缀+ 1级分类的id+ ".js"作为后缀
                商标文件： 以"tm_class_1_"作为 前缀+ 1级分类的id+ ".js"作为后缀





文件的json内容：



                
        
        实现过程：
        
        ①创建maven (jar）工程 
        

        ②加依赖 
       

<dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.37</version>
		</dependency>

		
		<!-- 2.MyBatis -->

		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>3.2.8</version>
		</dependency>
		
		<dependency>
			<groupId>com.google.code.gson</groupId>
			<artifactId>gson</artifactId>
			<version>2.2.4</version>
		</dependency>

         
        ③配置文件        

jdbcConfig.properties

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/gmall?useUnicode=true&characterEncoding=UTF8
username=root
password=123456

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<properties resource="jdbcConfig.properties" />
   <environments default="development">
	<environment id="development">
		 <transactionManager type="JDBC"/>
		<dataSource type="POOLED">
			 <property name="driver" value="${driver}"></property>
			 <property name="url" value="${url}"></property>
			 <property name="username" value="${username}"></property>
			 <property name="password" value="${password}"></property>
		</dataSource>
	</environment>
</environments>
  <mappers>
  <package name="com.nwj.mapper" /> 
  </mappers>
</configuration>

        ④创建bean/mapper接口  

T_MALL_CLASS_1.java

package com.nwj.bean;

public class T_MALL_CLASS_1 {

	private int id;
	private String flmch1;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getFlmch1() {
		return flmch1;
	}

	public void setFlmch1(String flmch1) {
		this.flmch1 = flmch1;
	}

}

T_MALL_CLASS_1_mapper.java

package com.nwj.mapper;

import java.util.List;

import com.nwj.bean.T_MALL_CLASS_1;

public interface T_MALL_CLASS_1_mapper {
	
	List<T_MALL_CLASS_1> getlist();
	

}

T_MALL_CLASS_1_mapper.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.nwj.mapper.T_MALL_CLASS_1_mapper">
  	<select id ="getlist" resultType="com.nwj.bean.T_MALL_CLASS_1">
  	    select * from t_mall_class_1
  	</select>
  </mapper>

         
补充： bean
            pojo
            entity
          三点：所有属性使用private修饰，提供setter/getter方法，有一个无参构造器
   
 
        ⑤单元测试

TestClass_1.java

package com.nwj.js;

import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.List;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import com.google.gson.Gson;
import com.nwj.bean.T_MALL_CLASS_1;
import com.nwj.mapper.T_MALL_CLASS_1_mapper;

import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.List;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.Test;

import com.google.gson.Gson;
import com.nwj.bean.T_MALL_CLASS_1;
import com.nwj.mapper.T_MALL_CLASS_1_mapper;

public class TestClass_1 {

	@Test
	public void test() throws Exception {

		//获取sqlSessionFactory
		String resource = "mybatis-config.xml";
		InputStream inputStream = Resources.getResourceAsStream(resource);
		SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
		
		//获取session
		SqlSession session = sqlSessionFactory.openSession();
		//获取mapper
		T_MALL_CLASS_1_mapper class_1_mapper = session.getMapper(T_MALL_CLASS_1_mapper.class);
		//操作获取数据
		List<T_MALL_CLASS_1> class1list = class_1_mapper.getlist();
		System.out.println(class1list.size());
		//创建gson对象
		Gson gson = new Gson();
		//转json
		String class1str = gson.toJson(class1list);
		
		//生成静态文件
		FileOutputStream out = new FileOutputStream("e:/class_1.js");
		out.write(class1str.getBytes());
		out.close();
	}

}