go 模版引擎简单实例

go语言提供了两种模版引擎，分别是html/template和text/template，两种模版引擎的语法相同，不同的地方就在于html中对标签等的处理。
模版语法参考连接：https://www.cnblogs.com/Pynix/p/4154630.html

我们这里使用text/template引擎做一个代码生成的小例子，选择生成一个java类的代码：

• 模版conf.template文件如下：

package {{ .PackageName }};

import java.util.Collections;
import java.util.Comparator;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
{{if ne .SuperClass ""}}import com.lehoo.sob.confsuper.{{.SuperClass}};{{end}}

/**
 - excel|{{.ExcelName}}
 - @author administrator
 - 此类是系统自动生成类 不要直接修改，修改后也会被覆盖
 */
@JSONListener
{{if eq .SuperClass ""}}
public class Conf{{.SheetName}} {{"{"}}
{{else}}
public class Conf{{.SheetName}} extends {{.SuperClass}}{{"{"}}
{{end}}
    /** 对应的数据文件 */
    private static final String JSON_NAME = "Conf{{.SheetName}}.json";
    /**索引*/
    private static final String [] INDEXS = {{.Indexs}};
    {{range .Props}}
    /** {{.PNote}} */
    private {{.PType}} {{.PName}};
    {{end}}
    /** 配置数据 */
    private static Map{{"<"}}Object,Conf{{.SheetName}}{{">"}} datas = new LinkedHashMap{{"<"}}{{">"}}();
    /**索引结构,加快查询速度*/
    private static Map{{"<"}}String,Map{{"<"}}Object,List{{"<"}}Conf{{.SheetName}}{{">"}}{{">"}}{{">"}} indexs = new HashMap{{"<"}}{{">"}}();
    /** 私有构造函数 */
    private Conf{{.SheetName}}(){ }

    /**初始化索引*/
    private static void initIndex(){
        //初始化索引结构
        for(String index : INDEXS){
            Map{{"<"}}Object,List{{"<"}}Conf{{.SheetName}}{{">"}}{{">"}} map = new HashMap{{"<"}}{{">"}}();
            indexs.put(index, map);
        }
    }

    /**
     * 数据字段
     * @author chuer
     */
    public static final class K {
        {{range .Props}}
        /**{{.PNote}}*/
        public static final String {{.PName}} = "{{.PName}}";
        {{end}}
    }
}

• 解析模版

package main
import (
    "fmt"
    "os"
    "text/template"
)
type Prop struct {
    PType string
    PName string
    PNote string
}
type Data struct {
    PackageName string
    Props []Prop
    HaveDateProp bool
    SuperClass string
    ExcelName string
    SheetName string
    Indexs string
}
func main(){
    p:= Data{"org.chuer.test",
    []Prop{{PType:"String",PName:"sn",PNote:"aa"},{PType:"Date",PName:"time",PNote:"bbb"}},
    true,"Action","aaa.xlsx","Solider","time"}
    filename := "C:\\Users\\Administrator\\Desktop\\conf.template"
    t := template.New("conf.template")
    t, _ = t.ParseFiles(filename)
    err := t.Execute(os.Stdout, p)
    if err != nil {
        fmt.Println("bbb,",err)
    }

}

• 解析结果

package org.chuer.test;

import java.util.Collections;
import java.util.Comparator;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import com.lehoo.sob.confsuper.Action;

/**
 * excel|aaa.xlsx
 * @author administrator
 * 此类是系统自动生成类 不要直接修改，修改后也会被覆盖
 */
@JSONListener

public class ConfSolider extends Action{

    /** 对应的数据文件 */
    private static final String JSON_NAME = "ConfSolider.json";

    /**索引*/
    private static final String [] INDEXS = time;


    /** aa */
    private String sn;

    /** bbb */
    private Date time;


    /** 配置数据 */
    private static Map<Object,ConfSolider> datas = new LinkedHashMap<>();

    /**索引结构,加快查询速度*/
    private static Map<String,Map<Object,List<ConfSolider>>> indexs = new HashMap<>();


    /** 私有构造函数 */
    private ConfSolider(){ }

    /**初始化索引*/
    private static void initIndex(){
        //初始化索引结构
        for(String index : INDEXS){
            Map<Object,List<ConfSolider>> map = new HashMap<>();
            indexs.put(index, map);
        }
    }

    /**
     * 数据字段
     * @author chuer
     */
    public static final class K {


        /**aa*/
        public static final String sn = "sn";

        /**bbb*/
        public static final String time = "time";


    }

}
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