修改mybatis plus Generator模板生成字段注释枚举常量

修改mybatis plus Generator模板生成字段注释枚举常量

本文基于最新的mybatis-plus 3.0.1版本源码修改，如果使用其它版本，处理方式也类似，主要是生成Entity的FreekMarker模板文件的修改。
源码下载：https://gitee.com/baomidou/mybatis-plus

---

目标：

表的字段定义如下：
`name_type` int(1) DEFAULT NULL COMMENT '名字类型{Girl：0，女孩；boy：1，男孩；other：2，其它}'

生成的实体中有如下内容：
/*
* name_type : 女孩
*/
private final static INTEGER NAME_TYPE_GIRL = 0;

/*
* name_type : 男孩
*/
private final static INTEGER NAME_TYPE_BOY = 1;

/*
* name_type : 其它
 */
private final static INTEGER NAME_TYPE_OTHER= 2;

主要的模板代码如下：

<#-- 注释的枚举常量生成，例如字段内容为：`name_type` int(1) DEFAULT NULL COMMENT '名字类型{Girl：0，女孩；boy：1，男孩；other：2，其它}' -->
    <#if field.comment!?length gt 0>
        <#if field.comment?contains("{") && field.comment?contains("}") && field.comment?contains("；") && field.comment?contains("，") >
            <#assign object_str = field.comment?substring(field.comment?index_of("{")+1, field.comment?index_of("}"))/>
            <#list object_str?split("；") as comment_element>
                <#assign firstName = comment_element?substring(0, comment_element?index_of("："))/>
                <#assign lastName = comment_element?substring(comment_element?index_of("：")+1, comment_element?index_of("，"))/>
                <#assign meanName = comment_element?keep_after("，")/>
                <#assign fname = field.propertyName/>
    /**
    * ${field.propertyName}：${meanName}
    */
    public final static ${field.propertyType} ${(field.name)?upper_case}_${firstName?upper_case} = ${lastName};
            </#list>
        </#if>
    </#if>

完整的entity.java.ftl的内容如下：

package ${package.Entity};

<#list table.importPackages as pkg>
import ${pkg};
</#list>
<#if swagger2>
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
</#if>
<#if entityLombokModel>
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;
</#if>

/**
 * <p>
 * ${table.comment!}
 * </p>
 *
 * @author ${author}
 * @since ${date}
 */
<#if entityLombokModel>
@Data
    <#if superEntityClass??>
@EqualsAndHashCode(callSuper = true)
    <#else>
@EqualsAndHashCode(callSuper = false)
    </#if>
@Accessors(chain = true)
</#if>
<#if table.convert>
@TableName("${table.name}")
</#if>
<#if swagger2>
@ApiModel(value="${entity}对象", description="${table.comment!}")
</#if>
<#if superEntityClass??>
public class ${entity} extends ${superEntityClass}<#if activeRecord><${entity}></#if> {
<#elseif activeRecord>
public class ${entity} extends Model<${entity}> {
<#else>
public class ${entity} implements Serializable {
</#if>

    private static final long serialVersionUID = 1L;
<#-- ----------  BEGIN 字段循环遍历  ---------->
<#list table.fields as field>
    <#if field.keyFlag>
        <#assign keyPropertyName="${field.propertyName}"/>
    </#if>

    <#if field.comment!?length gt 0>
    <#if swagger2>
    @ApiModelProperty(value = "${field.comment}")
    <#else>
    /**
     * ${field.comment}
     */
    </#if>
    </#if>
    <#if field.keyFlag>
    <#-- 主键 -->
        <#if field.keyIdentityFlag>
    @TableId(value = "${field.name}", type = IdType.AUTO)
        <#elseif idType??>
    @TableId(value = "${field.name}", type = IdType.${idType})
        <#elseif field.convert>
    @TableId("${field.name}")
        </#if>
    <#-- 普通字段 -->
    <#elseif field.fill??>
    <#-- -----   存在字段填充设置   ----->
        <#if field.convert>
    @TableField(value = "${field.name}", fill = FieldFill.${field.fill})
        <#else>
    @TableField(fill = FieldFill.${field.fill})
        </#if>
    <#elseif field.convert>
    @TableField("${field.name}")
    </#if>
<#-- 乐观锁注解 -->
    <#if (versionFieldName!"") == field.name>
    @Version
    </#if>
<#-- 逻辑删除注解 -->
    <#if (logicDeleteFieldName!"") == field.name>
    @TableLogic
    </#if>
    private ${field.propertyType} ${field.propertyName};

<#-- 注释的枚举常量生成，例如字段内容为：`name_type` int(1) DEFAULT NULL COMMENT '名字类型{Girl：0，女孩；boy：1，男孩；other：2，其它}' -->
    <#if field.comment!?length gt 0>
        <#if field.comment?contains("{") && field.comment?contains("}") && field.comment?contains("；") && field.comment?contains("，") >
            <#assign object_str = field.comment?substring(field.comment?index_of("{")+1, field.comment?index_of("}"))/>
            <#list object_str?split("；") as comment_element>
                <#assign firstName = comment_element?substring(0, comment_element?index_of("："))/>
                <#assign lastName = comment_element?substring(comment_element?index_of("：")+1, comment_element?index_of("，"))/>
                <#assign meanName = comment_element?keep_after("，")/>
                <#assign fname = field.propertyName/>
    /**
    * ${field.propertyName}：${meanName}
    */
    public final static ${field.propertyType} ${(field.name)?upper_case}_${firstName?upper_case} = ${lastName};
            </#list>
        </#if>
    </#if>
</#list>
<#------------  END 字段循环遍历  ---------->

<#if !entityLombokModel>
    <#list table.fields as field>
        <#if field.propertyType == "boolean">
            <#assign getprefix="is"/>
        <#else>
            <#assign getprefix="get"/>
        </#if>
    public ${field.propertyType} ${getprefix}${field.capitalName}() {
        return ${field.propertyName};
    }

        <#if entityBuilderModel>
    public ${entity} set${field.capitalName}(${field.propertyType} ${field.propertyName}) {
        <#else>
    public void set${field.capitalName}(${field.propertyType} ${field.propertyName}) {
        </#if>
        this.${field.propertyName} = ${field.propertyName};
        <#if entityBuilderModel>
        return this;
        </#if>
    }
    </#list>
</#if>

<#if entityColumnConstant>
    <#list table.fields as field>
    public static final String ${field.name?upper_case} = "${field.name}";

    </#list>
</#if>
<#if activeRecord>
    @Override
    protected Serializable pkVal() {
    <#if keyPropertyName??>
        return this.${keyPropertyName};
    <#else>
        return null;
    </#if>
    }

</#if>
<#if !entityLombokModel>
    @Override
    public String toString() {
        return "${entity}{" +
    <#list table.fields as field>
        <#if field_index==0>
        "${field.propertyName}=" + ${field.propertyName} +
        <#else>
        ", ${field.propertyName}=" + ${field.propertyName} +
        </#if>
    </#list>
        "}";
    }
</#if>
}