导入项目

项目是由eclipse来编写的，我使用的开发环境是Idea，那么就需要将eclipse项目导入进去Idea中。要想项目能够启动起来。是这样干的：

导入eclipse的项目

添加对应的Web Model，添加完毕之后，默认会提示要我们创建对应的Facts的。

接着修改Facets中标出的值，因为我们手动创建的话，指向的是Idea中的web目录的。可是项目是用eclipse编写的，因此要改成是WebRoot对应的文件！

接着配置Tomcat，就基本可以让eclipse中的项目在Idea环境下运行了。

主菜单跳转JSP页面

在主菜单页面上有很多的URL跳转到不同的JSP页面。

这些超链接是不同的模块下的。但是我们可以使用BaseAction对他们进行统一管理起来！

        //方法参数folder通过@PathVariable指定其值可以从@RequestMapping的{folder}获取，同理file也一样        @RequestMapping("/goURL/{folder}/{file}")        public String goURL(@PathVariable String folder,@PathVariable String file) {            return "forward:/WEB-INF/"+folder+"/"+file+".jsp";        }

        @RequestMapping("/goURL/{folder}/{file}")        public String goURL(@PathVariable String folder,@PathVariable String file) {            return "forward:/WEB-INF/"+folder+"/"+file+".jsp";        }

我们常常在跳转页面之前都要查询数据库的数据的，那如果是这样设计的话，我们可以将常用数据放在application域对象中，或者使用ajax来进行获取数据！

分页对象设计

之前我们做的分页对象就仅仅把我们分页所用到的基本属性封装起来。如果页面上有查询条件的话，我们另外创建了一个查询对象。

当时候创建出来的查询对象的属性是根据页面上的条件来编写的。这样做得不够好，没有通用性！

这次看见这个项目的Page设计就非常通用了，虽然把查询条件都放在了Page对象中，但我感觉比之前那个好！

public class Page<T> implements Serializable {    private static final long serialVersionUID = 337297181251071639L;    private Integer page;//当前页    private Integer rows;//页大小    private Integer totalRecord;// 总记录 数    private List<T> list;//页面数据列表    private String keyWord;//查询关键字    private T paramEntity;//多条件查询    private Integer start;//需要这里处理    //因为它用的是easyUI，所以没有设置总页数的属性，使用Map集合来替代了。    private Map<String, Object> pageMap = new HashMap<String, Object>() ;    public Map<String, Object> getPageMap() {        return pageMap;    }    /*public void setPageMap(Map<String, Object> pageMap) {        this.pageMap = pageMap;    }*/    public T getParamEntity() {        return paramEntity;    }    public void setParamEntity(T paramEntity) {        this.paramEntity = paramEntity;    }    public Integer getPage() {        return page;    }    public void setPage(Integer page) {        this.page = page;    }    public Integer getRows() {        return rows;    }    public void setRows(Integer rows) {        this.rows = rows;    }    /*public Integer getTotalRecord() {        return totalRecord;    }*/    public void setTotalRecord(Integer totalRecord) {        pageMap.put("total", totalRecord);        this.totalRecord = totalRecord;    }/*    public List<T> getList() {        return list;    }*/    public void setList(List<T> list) {        pageMap.put("rows", list);        this.list = list;    }    public String getKeyWord() {        return keyWord;    }    public void setKeyWord(String keyWord) {        this.keyWord = keyWord;    }    public Integer getStart() {        this.start = (page-1)*rows;        return start;    }    public void setStart(Integer start) {        this.start = start;    }    @Override    public String toString() {        return "Page [page=" + page + ", rows=" + rows + ", totalRecord="                + totalRecord + ", list=" + list + ", keyWord=" + keyWord                + ", paramEntity=" + paramEntity + ", start=" + start + "]";    }}class Page<T> implements Serializable {

    private static final long serialVersionUID = 337297181251071639L;

    private Integer page;//当前页    private Integer rows;//页大小    private Integer totalRecord;// 总记录 数

    private List<T> list;//页面数据列表

    private String keyWord;//查询关键字

    private T paramEntity;//多条件查询

    private Integer start;//需要这里处理

    //因为它用的是easyUI，所以没有设置总页数的属性，使用Map集合来替代了。    private Map<String, Object> pageMap = new HashMap<String, Object>() ;    public Map<String, Object> getPageMap() {        return pageMap;    }    /*public void setPageMap(Map<String, Object> pageMap) {        this.pageMap = pageMap;    }*/    public T getParamEntity() {        return paramEntity;    }    public void setParamEntity(T paramEntity) {        this.paramEntity = paramEntity;    }    public Integer getPage() {        return page;    }    public void setPage(Integer page) {        this.page = page;    }    public Integer getRows() {        return rows;    }    public void setRows(Integer rows) {        this.rows = rows;    }    /*public Integer getTotalRecord() {        return totalRecord;    }*/    public void setTotalRecord(Integer totalRecord) {        pageMap.put("total", totalRecord);        this.totalRecord = totalRecord;    }/*    public List<T> getList() {        return list;    }*/    public void setList(List<T> list) {        pageMap.put("rows", list);        this.list = list;    }    public String getKeyWord() {        return keyWord;    }    public void setKeyWord(String keyWord) {        this.keyWord = keyWord;    }    public Integer getStart() {        this.start = (page-1)*rows;        return start;    }    public void setStart(Integer start) {        this.start = start;    }    @Override    public String toString() {        return "Page [page=" + page + ", rows=" + rows + ", totalRecord="                + totalRecord + ", list=" + list + ", keyWord=" + keyWord                + ", paramEntity=" + paramEntity + ", start=" + start + "]";    }}

抽取Service层

之前我们也抽取过Service层的代码，当时候也觉得用得十分巧妙：

然而，这次看到的baseService就用得更加巧妙了，并且设计得更加好！

如下代码：

package cn.itcast.scm.service.impl;import java.lang.reflect.Field;import java.lang.reflect.ParameterizedType;import javax.annotation.PostConstruct;import org.springframework.beans.factory.annotation.Autowired;import cn.itcast.scm.dao.AccountMapper;import cn.itcast.scm.dao.AccountRecordsMapper;import cn.itcast.scm.dao.BaseMapper;import cn.itcast.scm.dao.BuyOrderDetailMapper;import cn.itcast.scm.dao.BuyOrderMapper;import cn.itcast.scm.dao.GoodsMapper;import cn.itcast.scm.dao.SupplierMapper;import cn.itcast.scm.dao.SysParamMapper;import cn.itcast.scm.entity.Page;import cn.itcast.scm.service.BaseService;public class BaseServiceImpl<T> implements BaseService<T> {    protected  BaseMapper<T> baseMapper;    @Autowired    protected  SupplierMapper supplierMapper;    @Autowired    protected  AccountMapper accountMapper;    @Autowired    protected  GoodsMapper goodsMapper;    @Autowired    protected  BuyOrderMapper buyOrderMapper;    @Autowired    protected  BuyOrderDetailMapper buyOrderDetailMapper;    @Autowired    protected  AccountRecordsMapper accountRecordsMapper;    @Autowired    protected  SysParamMapper sysParamMapper;    @PostConstruct//在构造方法后，初化前执行    private void initBaseMapper() throws Exception{        //完成以下逻辑，需要对研发本身进行命名与使用规范        //this关键字指对象本身，这里指的是调用此方法的实现类（子类）        System.out.println("=======this :"+this);        System.out.println("=======父类基本信息："+this.getClass().getSuperclass());        System.out.println("=======父类和泛型的信息："+this.getClass().getGenericSuperclass());        ParameterizedType type =(ParameterizedType) this.getClass().getGenericSuperclass();        //获取第一个参数的class        Class clazz = (Class)type.getActualTypeArguments()[0];        System.out.println("=======class:"+clazz);        //转化为属性名（相关的Mapper子类的引用名）Supplier  supplierMapper        String localField = clazz.getSimpleName().substring(0,1).toLowerCase()+clazz.getSimpleName().substring(1)+"Mapper";        System.out.println("=======localField:"+localField);        //getDeclaredField:可以使用于包括私有、默认、受保护、公共字段，但不包括继承的字段        Field field=this.getClass().getSuperclass().getDeclaredField(localField);        System.out.println("=======field:"+field);        System.out.println("=======field对应的对象:"+field.get(this));        Field baseField = this.getClass().getSuperclass().getDeclaredField("baseMapper");        System.out.println("=======baseField:"+baseField);        System.out.println("=======baseField对应的对象:"+baseField.get(this));        //field.get(this)获取当前this的field字段的值。例如：Supplier对象中，baseMapper所指向的对象为其子类型SupplierMapper对象，子类型对象已被spring实例化于容器中        baseField.set(this, field.get(this));        System.out.println("========baseField对应的对象:"+baseMapper);    }   }

import java.lang.reflect.Field;import java.lang.reflect.ParameterizedType;

import javax.annotation.PostConstruct;

import org.springframework.beans.factory.annotation.Autowired;

import cn.itcast.scm.dao.AccountMapper;import cn.itcast.scm.dao.AccountRecordsMapper;import cn.itcast.scm.dao.BaseMapper;import cn.itcast.scm.dao.BuyOrderDetailMapper;import cn.itcast.scm.dao.BuyOrderMapper;import cn.itcast.scm.dao.GoodsMapper;import cn.itcast.scm.dao.SupplierMapper;import cn.itcast.scm.dao.SysParamMapper;import cn.itcast.scm.entity.Page;import cn.itcast.scm.service.BaseService;

public class BaseServiceImpl<T> implements BaseService<T> {    protected  BaseMapper<T> baseMapper;

    @Autowired    protected  SupplierMapper supplierMapper;

    @Autowired    protected  AccountMapper accountMapper;

    @Autowired    protected  GoodsMapper goodsMapper;

    @Autowired    protected  BuyOrderMapper buyOrderMapper;

    @Autowired    protected  BuyOrderDetailMapper buyOrderDetailMapper;

    @Autowired    protected  AccountRecordsMapper accountRecordsMapper;

    @Autowired    protected  SysParamMapper sysParamMapper;

    @PostConstruct//在构造方法后，初化前执行    private void initBaseMapper() throws Exception{

        //完成以下逻辑，需要对研发本身进行命名与使用规范        //this关键字指对象本身，这里指的是调用此方法的实现类（子类）        System.out.println("=======this :"+this);        System.out.println("=======父类基本信息："+this.getClass().getSuperclass());        System.out.println("=======父类和泛型的信息："+this.getClass().getGenericSuperclass());

        ParameterizedType type =(ParameterizedType) this.getClass().getGenericSuperclass();        //获取第一个参数的class        Class clazz = (Class)type.getActualTypeArguments()[0];        System.out.println("=======class:"+clazz);        //转化为属性名（相关的Mapper子类的引用名）Supplier  supplierMapper        String localField = clazz.getSimpleName().substring(0,1).toLowerCase()+clazz.getSimpleName().substring(1)+"Mapper";        System.out.println("=======localField:"+localField);

        //getDeclaredField:可以使用于包括私有、默认、受保护、公共字段，但不包括继承的字段        Field field=this.getClass().getSuperclass().getDeclaredField(localField);        System.out.println("=======field:"+field);        System.out.println("=======field对应的对象:"+field.get(this));

        Field baseField = this.getClass().getSuperclass().getDeclaredField("baseMapper");        System.out.println("=======baseField:"+baseField);        System.out.println("=======baseField对应的对象:"+baseField.get(this));        //field.get(this)获取当前this的field字段的值。例如：Supplier对象中，baseMapper所指向的对象为其子类型SupplierMapper对象，子类型对象已被spring实例化于容器中        baseField.set(this, field.get(this));        System.out.println("========baseField对应的对象:"+baseMapper);

    }   

}

这个baseService并没有给出对应的setDao的方法，那它是怎么将BaseDao实例化的呢？？？关键就在于initBaseMapper()这个方法！

我们来看一下方法内部打印数据的内容吧：

=======this :cn.itcast.scm.service.impl.BuyOrderServiceImpl@13a739e=======父类基本信息：class cn.itcast.scm.service.impl.BaseServiceImpl=======父类和泛型的信息：cn.itcast.scm.service.impl.BaseServiceImpl<cn.itcast.scm.entity.BuyOrder>=======class:class cn.itcast.scm.entity.BuyOrder=======localField:buyOrderMapper=======field:protected cn.itcast.scm.dao.BuyOrderMapper cn.itcast.scm.service.impl.BaseServiceImpl.buyOrderMapper=======field对应的对象:org.apache.ibatis.binding.MapperProxy@7cc946=======baseField:protected cn.itcast.scm.dao.BaseMapper cn.itcast.scm.service.impl.BaseServiceImpl.baseMapper=======baseField对应的对象:null========baseField对应的对象:org.apache.ibatis.binding.MapperProxy@7cc946BuyOrderServiceImpl@13a739e=======父类基本信息：class cn.itcast.scm.service.impl.BaseServiceImpl=======父类和泛型的信息：cn.itcast.scm.service.impl.BaseServiceImpl<cn.itcast.scm.entity.BuyOrder>=======class:class cn.itcast.scm.entity.BuyOrder=======localField:buyOrderMapper=======field:protected cn.itcast.scm.dao.BuyOrderMapper cn.itcast.scm.service.impl.BaseServiceImpl.buyOrderMapper=======field对应的对象:org.apache.ibatis.binding.MapperProxy@7cc946=======baseField:protected cn.itcast.scm.dao.BaseMapper cn.itcast.scm.service.impl.BaseServiceImpl.baseMapper=======baseField对应的对象:null========baseField对应的对象:org.apache.ibatis.binding.MapperProxy@7cc946

这个方法被@PostConstruct注解给修饰着

通过我一阵的梳理，BaseDao的实例化过程是这样的：

其实上面也是通过具体的serviceImpl来对baseDao来进行初始化，不过它这样子做的话就显得更加优雅了。并不需要在每个具体的serviceImpl使用setDao()的方式来进行实例化。

通过上面的解释、我们把注释写上，就很容易理解了。

    /**     * 每当service实例化的时候，这个方法都会被调用     * @throws Exception     */    @PostConstruct    private void initBaseMapper() throws Exception{        //获取泛型的信息        ParameterizedType type =(ParameterizedType) this.getClass().getGenericSuperclass();        Class clazz = (Class)type.getActualTypeArguments()[0];        //拼接成“泛型”Mapper字符串        String localField = clazz.getSimpleName().substring(0,1).toLowerCase()+clazz.getSimpleName().substring(1)+"Mapper";        //通过反射来获取成员变量的值        Field field=this.getClass().getSuperclass().getDeclaredField(localField);        Field baseField = this.getClass().getSuperclass().getDeclaredField("baseMapper");        //将baseDao来进行实例化        baseField.set(this, field.get(this));    }    @PostConstruct    private void initBaseMapper() throws Exception{

        //获取泛型的信息        ParameterizedType type =(ParameterizedType) this.getClass().getGenericSuperclass();        Class clazz = (Class)type.getActualTypeArguments()[0];

        //拼接成“泛型”Mapper字符串        String localField = clazz.getSimpleName().substring(0,1).toLowerCase()+clazz.getSimpleName().substring(1)+"Mapper";

        //通过反射来获取成员变量的值        Field field=this.getClass().getSuperclass().getDeclaredField(localField);        Field baseField = this.getClass().getSuperclass().getDeclaredField("baseMapper");

        //将baseDao来进行实例化        baseField.set(this, field.get(this));    }

分析项目的业务

本项目主要用EASY-UI来作为前段的页面构建。这里就不一一去探究EASY-UI的用法的，当用到这个前段UI的时候再回头看吧。下面就直接分析它的具体逻辑体悟了。

用户登陆

首先，程序的入口是用户登录的界面。用户设计得比较简单，因为只用来做登录。

CREATE TABLE account(    acc_id INT(11) PRIMARY KEY NOT NULL AUTO_INCREMENT,    acc_login VARCHAR(20),    acc_name VARCHAR(20),    acc_pass VARCHAR(20));TABLE account(    acc_id INT(11) PRIMARY KEY NOT NULL AUTO_INCREMENT,    acc_login VARCHAR(20),    acc_name VARCHAR(20),    acc_pass VARCHAR(20));

对于用户登陆而言，我们已经是非常熟悉这个业务了。只是在数据库中对比一下数据、如果存在这个数据，那么在session域中保存即可！

基本数据的数据库表

CREATE TABLE supplier(    sup_id INT(11) PRIMARY KEY NOT NULL,    sup_name VARCHAR(20),    sup_linkman VARCHAR(20),    sup_phone VARCHAR(11),    sup_address VARCHAR(100),    sup_remark VARCHAR(100),    sup_pay DECIMAL(12,2),    sup_type VARCHAR(10));TABLE supplier(    sup_id INT(11) PRIMARY KEY NOT NULL,    sup_name VARCHAR(20),    sup_linkman VARCHAR(20),    sup_phone VARCHAR(11),    sup_address VARCHAR(100),    sup_remark VARCHAR(100),    sup_pay DECIMAL(12,2),    sup_type VARCHAR(10));

CREATE TABLE goods(    goods_Id VARCHAR(36) PRIMARY KEY NOT NULL,    goods_name VARCHAR(20),    goods_unit VARCHAR(10),    goods_type VARCHAR(10),    goods_color VARCHAR(10),    goods_store INT(11),    goods_limit INT(11),    goods_commission DECIMAL(2,2),    goods_producer VARCHAR(50),    goods_remark VARCHAR(100),    goods_sel_price DECIMAL(12,2),    goods_buy_price DECIMAL(12,2));TABLE goods(    goods_Id VARCHAR(36) PRIMARY KEY NOT NULL,    goods_name VARCHAR(20),    goods_unit VARCHAR(10),    goods_type VARCHAR(10),    goods_color VARCHAR(10),    goods_store INT(11),    goods_limit INT(11),    goods_commission DECIMAL(2,2),    goods_producer VARCHAR(50),    goods_remark VARCHAR(100),    goods_sel_price DECIMAL(12,2),    goods_buy_price DECIMAL(12,2));

CREATE TABLE store_house(    sh_id VARCHAR(10) PRIMARY KEY NOT NULL,    sh_name VARCHAR(20),    sh_responsible VARCHAR(20),    sh_phone VARCHAR(11),    sh_address VARCHAR(50),    sh_type VARCHAR(10),    sh_remark VARCHAR(100));TABLE store_house(    sh_id VARCHAR(10) PRIMARY KEY NOT NULL,    sh_name VARCHAR(20),    sh_responsible VARCHAR(20),    sh_phone VARCHAR(11),    sh_address VARCHAR(50),    sh_type VARCHAR(10),    sh_remark VARCHAR(100));

上边这几张表都仅仅是CRUD的操作。

那么这个项目是这样处理的，将经常用到的数据用一张表保存起来。

drop table if exists sys_param;/*====================================系统参数表==============================*//*==============================================================*//* Table: sys_param                                             *//*==============================================================*//*create table sys_param(   sys_param_id         bigint  auto_increment,   sys_param_field      varchar(50),   sys_param_value      varchar(50),   sys_param_text       varchar(50),   primary key (sys_param_id));*/create table sys_param(   sys_param_id         bigint  auto_increment,   sys_param_field      varchar(50),   sys_param_value      varchar(500),   sys_param_text       varchar(50),   sys_param_type       varchar(2),      primary key (sys_param_id));insert into sys_param(sys_param_field,sys_param_value,sys_param_type) values('shId','select s.sh_id as sys_param_value,s.sh_name as sys_param_text from store_house s','1');insert into sys_param(sys_param_field,sys_param_value,sys_param_text) values('supType','1','一级供应商');insert into sys_param(sys_param_field,sys_param_value,sys_param_text) values('supType','2','二级供应商');insert into sys_param(sys_param_field,sys_param_value,sys_param_text) values('supType','3','普通供应商');insert into sys_param(sys_param_field,sys_param_value,sys_param_text) values('goodsColor','1','红色');insert into sys_param(sys_param_field,sys_param_value,sys_param_text) values('goodsColor','2','绿色');insert into sys_param(sys_param_field,sys_param_value,sys_param_text) values('goodsColor','3','蓝色');select * from sys_param;table if exists sys_param;/*====================================系统参数表==============================*//*==============================================================*//* Table: sys_param                                             *//*==============================================================*//*create table sys_param(   sys_param_id         bigint  auto_increment,   sys_param_field      varchar(50),   sys_param_value      varchar(50),   sys_param_text       varchar(50),   primary key (sys_param_id));*/create table sys_param(   sys_param_id         bigint  auto_increment,   sys_param_field      varchar(50),   sys_param_value      varchar(500),   sys_param_text       varchar(50),   sys_param_type       varchar(2),      primary key (sys_param_id));insert into sys_param(sys_param_field,sys_param_value,sys_param_type) values('shId','select s.sh_id as sys_param_value,s.sh_name as sys_param_text from store_house s','1');

insert into sys_param(sys_param_field,sys_param_value,sys_param_text) values('supType','1','一级供应商');insert into sys_param(sys_param_field,sys_param_value,sys_param_text) values('supType','2','二级供应商');insert into sys_param(sys_param_field,sys_param_value,sys_param_text) values('supType','3','普通供应商');insert into sys_param(sys_param_field,sys_param_value,sys_param_text) values('goodsColor','1','红色');insert into sys_param(sys_param_field,sys_param_value,sys_param_text) values('goodsColor','2','绿色');insert into sys_param(sys_param_field,sys_param_value,sys_param_text) values('goodsColor','3','蓝色');select * from sys_param;

上面我们可以看到，除了单单保存了一些的基本属性之外，我们来存储了SQL语句，那么我们怎么将SQL语句转成是我们的数据呢？？？

那它是怎么实现这种玩意的呢？？

Mapper查询表的数据

  <select id="selectList" parameterType="String" resultMap="sysParamResultMap">            select * from sys_param  </select>  <!-- 查询其它表的数据,使用${value}格式，允许使用sql语句作为参数执行 -->  <select id="selectOthreTable" parameterType="string" resultMap="sysParamResultMap">      ${value}  </select>      select * from sys_param  </select>

  <!-- 查询其它表的数据,使用${value}格式，允许使用sql语句作为参数执行 -->  <select id="selectOthreTable" parameterType="string" resultMap="sysParamResultMap">      ${value}  </select>

Service将数据封装到一个总的Map中。具体的做法是这样子的：

package cn.itcast.scm.service.impl;import cn.itcast.scm.entity.SysParam;import cn.itcast.scm.service.SysParamService;import org.springframework.stereotype.Service;import java.util.HashMap;import java.util.List;import java.util.Map;@Service("sysParamService")public class SysParamServiceImpl extends BaseServiceImpl<SysParam> implements SysParamService {    @Override    public Map<String, Object> selectList() {        //查询出表中所有所有数据        List<SysParam> sysParams = sysParamMapper.selectList("");        //存储属性字段具体的值        Map<String, Object> fieldMap = null;        //最终的Map，key是属性字段，value是一个map(属性字段具体的值）        Map<String, Object> sysParamMap = new HashMap<String, Object>();        //遍历表中的记录，看是否有类型为1的字段数据！也就是SQL数据        for (SysParam sysParam : sysParams) {            if ("1".equals(sysParam.getSysParamType())) {                String sql = sysParam.getSysParamValue();                //执行SQL，得到查询后的记录                List<SysParam> otherList = sysParamMapper.selectOthreTable(sql);                fieldMap = new HashMap<>();                /**                 * select s.sh_id as sys_param_value,s.sh_name as sys_param_text  from store_house s                 */                //遍历查询后的记录，并把数据存到字段MAP                for (SysParam otherSysParam : otherList) {                    /**                     * key = 仓库的具体Id                     * value = 页面显示的仓库名称                     */                    fieldMap.put(otherSysParam.getSysParamValue(), otherSysParam.getSysParamText());                }                /**                 * key = shId                 * value = 存储具体数据的Map集合                 */                sysParamMap.put(sysParam.getSysParamField(), fieldMap);            } else {                //判断系统参数的map中是否存在字段的map，如果不存在，就新建一个                if (sysParamMap.get(sysParam.getSysParamField()) == null) {                    fieldMap = new HashMap<>();                    /**                     * key  = 1                     * value = 一级供应商                     */                    fieldMap.put(sysParam.getSysParamValue(), sysParam.getSysParamText());                    /**                     * key = supType                     * value = 存储具体数据的Map集合                     */                    sysParamMap.put(sysParam.getSysParamField(), fieldMap);                } else {                    //如果存在，那么就在原先的Map集合中添加                    fieldMap = (Map<String, Object>) sysParamMap.get(sysParam.getSysParamField());                    fieldMap.put(sysParam.getSysParamValue(), sysParam.getSysParamText());                }            }        }        /**         * key = shId        value = Map-->(1  主仓库）         *                             （2  分仓库）         *         * key = supType    value= Map-->( 1   一级供应商)         *                              ( 2  二级供应商)...         * key = goodsColor  value = Map--> (1  红色）....         */        return sysParamMap;    }}

import cn.itcast.scm.entity.SysParam;import cn.itcast.scm.service.SysParamService;import org.springframework.stereotype.Service;

import java.util.HashMap;import java.util.List;import java.util.Map;

@Service("sysParamService")public class SysParamServiceImpl extends BaseServiceImpl<SysParam> implements SysParamService {

    @Override    public Map<String, Object> selectList() {

        //查询出表中所有所有数据        List<SysParam> sysParams = sysParamMapper.selectList("");

        //存储属性字段具体的值        Map<String, Object> fieldMap = null;

        //最终的Map，key是属性字段，value是一个map(属性字段具体的值）        Map<String, Object> sysParamMap = new HashMap<String, Object>();

        //遍历表中的记录，看是否有类型为1的字段数据！也就是SQL数据        for (SysParam sysParam : sysParams) {            if ("1".equals(sysParam.getSysParamType())) {                String sql = sysParam.getSysParamValue();                //执行SQL，得到查询后的记录                List<SysParam> otherList = sysParamMapper.selectOthreTable(sql);                fieldMap = new HashMap<>();

                /**                 * select s.sh_id as sys_param_value,s.sh_name as sys_param_text  from store_house s                 */                //遍历查询后的记录，并把数据存到字段MAP                for (SysParam otherSysParam : otherList) {                    /**                     * key = 仓库的具体Id                     * value = 页面显示的仓库名称                     */                    fieldMap.put(otherSysParam.getSysParamValue(), otherSysParam.getSysParamText());                }                /**                 * key = shId                 * value = 存储具体数据的Map集合                 */                sysParamMap.put(sysParam.getSysParamField(), fieldMap);

            } else {                //判断系统参数的map中是否存在字段的map，如果不存在，就新建一个                if (sysParamMap.get(sysParam.getSysParamField()) == null) {                    fieldMap = new HashMap<>();                    /**                     * key  = 1                     * value = 一级供应商                     */                    fieldMap.put(sysParam.getSysParamValue(), sysParam.getSysParamText());

                    /**                     * key = supType                     * value = 存储具体数据的Map集合                     */                    sysParamMap.put(sysParam.getSysParamField(), fieldMap);                } else {

                    //如果存在，那么就在原先的Map集合中添加                    fieldMap = (Map<String, Object>) sysParamMap.get(sysParam.getSysParamField());                    fieldMap.put(sysParam.getSysParamValue(), sysParam.getSysParamText());                }            }        }        /**         * key = shId        value = Map-->(1  主仓库）         *                             （2  分仓库）         *         * key = supType    value= Map-->( 1   一级供应商)         *                              ( 2  二级供应商)...         * key = goodsColor  value = Map--> (1  红色）....         */        return sysParamMap;    }}

controller使用@PostConstruct注解，在初始化的时候就把数据加载到application域对象中

    //系统启动时加载参数    @PostConstruct    public void initSysParam(){        loadSysParam();    }    //用来加载系统参数      public void loadSysParam(){        Map<String, Object> sysParamMap = sysParamService.selectList();        application.setAttribute("sysParam", sysParamMap);        System.out.println("===================系统参数加载成功2=====================");    }    @PostConstruct    public void initSysParam(){        loadSysParam();    }

    //用来加载系统参数      public void loadSysParam(){        Map<String, Object> sysParamMap = sysParamService.selectList();        application.setAttribute("sysParam", sysParamMap);        System.out.println("===================系统参数加载成功2=====================");    }

采购商品

采购表buy_order：

单号bo_id，供货商sup_id，仓库sh_id，收货日期bo_date，应付（实付+欠款+优惠）bo_payable，实付bo_paid，欠款bo_Arrears，原始单号bo_original_id，备注bo_remark，经办人bo_attn，操作员operator。

采购明细表buy_order_detail：

编号bod_id：商品名称goods_id，单位goods_unit，数量 bod_amount，进价bod_buy_price，总金额（可无）bod_total_price，    采购单号bo_id，手机串号列表（##分隔）bod_IMEI

账务表account_records:

编号ad_id,供货商编号sup_id，日期ad_date，单号(不同类型单号不一样）ad_order_id，类型(业务类型）ad_bus_type，应付ad_payable，    实付ad_paid，欠款ad_arrears，优惠金额ad_discount，经办人ad_attn，操作员ad_operator。备注ad_remark

数据在插入的时候涉及到了这三张的数据库表：

至于我们的财务表的数据是用于拓展的，属性的信息基本是在采购表中获取：

    public int insertBuyOrder(BuyOrder buyOrder) throws Exception {        // TODO Auto-generated method stub        System.out.println("service.buyOrder:"+buyOrder);        int i = 0;              //生成采购单号,bo表示采购业务        //bo --商品采购        //ro --商品退货        //        String boId ="bo"+UUID.randomUUID().toString().replace("-", "");        System.out.println("boIduuid:"+boId);        //设置采购单号        buyOrder.setBoId(boId);             i = buyOrderMapper.insert(buyOrder);        //设置采购明细主键及与采购单的外键值        for(BuyOrderDetail bod : buyOrder.getBuyOrderDetails()){            bod.setBodId(UUID.randomUUID().toString().replace("-", ""));            bod.setBoId(boId);        }        buyOrderDetailMapper.insertList(buyOrder.getBuyOrderDetails());        AccountRecords accountRecords = new AccountRecords();        // 生成并设置怅务记录的主键        accountRecords.setArId(String.valueOf("ar"+UUID.randomUUID().toString().replace("-", "")));        accountRecords.setArAttn(buyOrder.getBoAttn());        accountRecords.setArArrears(buyOrder.getBoArrears());        //bo表示商品采购，可以在参数表中加入相关内容        accountRecords.setArBusType("bo");        accountRecords.setArDate(buyOrder.getBoDate());        //优惠金额：用应付金额减去实付金额再减去欠款        accountRecords.setArDiscount(buyOrder.getBoPayable().subtract(buyOrder.getBoPaid()).subtract(buyOrder.getBoArrears()));        accountRecords.setArOperator(buyOrder.getBoOperator());        //采购单号        accountRecords.setArOrderId(buyOrder.getBoId());        accountRecords.setArPaid(buyOrder.getBoPaid());        accountRecords.setArPayable(buyOrder.getBoPayable());        accountRecords.setArRemark(buyOrder.getBoRemark());        accountRecords.setSupId(buyOrder.getSupId());        accountRecordsMapper.insert(accountRecords);        return i;    }        // TODO Auto-generated method stub        System.out.println("service.buyOrder:"+buyOrder);        int i = 0;              //生成采购单号,bo表示采购业务

        //bo --商品采购        //ro --商品退货        //        String boId ="bo"+UUID.randomUUID().toString().replace("-", "");        System.out.println("boIduuid:"+boId);        //设置采购单号        buyOrder.setBoId(boId);             i = buyOrderMapper.insert(buyOrder);

        //设置采购明细主键及与采购单的外键值        for(BuyOrderDetail bod : buyOrder.getBuyOrderDetails()){            bod.setBodId(UUID.randomUUID().toString().replace("-", ""));            bod.setBoId(boId);        }        buyOrderDetailMapper.insertList(buyOrder.getBuyOrderDetails());

        AccountRecords accountRecords = new AccountRecords();        // 生成并设置怅务记录的主键        accountRecords.setArId(String.valueOf("ar"+UUID.randomUUID().toString().replace("-", "")));        accountRecords.setArAttn(buyOrder.getBoAttn());        accountRecords.setArArrears(buyOrder.getBoArrears());        //bo表示商品采购，可以在参数表中加入相关内容        accountRecords.setArBusType("bo");        accountRecords.setArDate(buyOrder.getBoDate());        //优惠金额：用应付金额减去实付金额再减去欠款        accountRecords.setArDiscount(buyOrder.getBoPayable().subtract(buyOrder.getBoPaid()).subtract(buyOrder.getBoArrears()));        accountRecords.setArOperator(buyOrder.getBoOperator());        //采购单号        accountRecords.setArOrderId(buyOrder.getBoId());        accountRecords.setArPaid(buyOrder.getBoPaid());        accountRecords.setArPayable(buyOrder.getBoPayable());        accountRecords.setArRemark(buyOrder.getBoRemark());        accountRecords.setSupId(buyOrder.getSupId());        accountRecordsMapper.insert(accountRecords);

        return i;    }

总结

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