尝试使用freemarker模板引擎生成打印文件

尝试使用freemarker模板引擎生成打印文件

参考

freemarker中文

freemarker官网

依赖

    org.springframework.boot
    spring-boot-starter-parent
    2.2.2.RELEASE
    


    org.springframework.boot
    spring-boot-starter-freemarker

测试代码

package com.mozq.freemarker.freemarker01.demo;

import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;
import freemarker.template.TemplateExceptionHandler;

import java.io.File;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;


public class Demo_02 {
    public static void main(String[] args) throws IOException, TemplateException {
        // Create your Configuration instance, and specify if up to what FreeMarker
// version (here 2.3.22) do you want to apply the fixes that are not 100%
// backward-compatible. See the Configuration JavaDoc for details.
        Configuration cfg = new Configuration(Configuration.VERSION_2_3_22);

// Specify the source where the template files come from. Here I set a
// plain directory for it, but non-file-system sources are possible too:
        cfg.setDirectoryForTemplateLoading(new File("E:\\mozq\\demo_project\\mozq_01\\freemarker-01\\src\\main\\resources\\templates"));

// Set the preferred charset template files are stored in. UTF-8 is
// a good choice in most applications:
        cfg.setDefaultEncoding("UTF-8");

// Sets how errors will appear.
// During web page *development* TemplateExceptionHandler.HTML_DEBUG_HANDLER is better.
        cfg.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);

        // Create the root hash
        Map root = new HashMap<>();
// Put string ``user'' into the root
        root.put("code", "BigJoe");
        root.put("orderQuipment", 6);
        root.put("orderStatus", 1);
        root.put("successDate", new SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date()));
        root.put("tableId", "123");
// Create the hash for ``latestProduct''
        Map latest = new HashMap<>();
// and put it into the root
        root.put("latestProduct", latest);
// put ``url'' and ``name'' into latest
        latest.put("url", "products/greenmouse.html");
        latest.put("name", "green mouse");

        Template temp = cfg.getTemplate("前台联.ftl");

        //将输出打印到控制台
        Writer out = new OutputStreamWriter(System.out);

        //将输出结果转换为字符串
        StringWriter stringWriter = new StringWriter();
        temp.process(root, stringWriter);
        String result = stringWriter.toString();

        System.out.println(result);
    }
}

模板文件

<#if orderQuipment == 1>
    
预点餐前台联
<#elseif orderQuipment == 6>
    
外卖前台联
<#else>
    
前台联


<#if tableId?? && tableId != ''>
    
餐桌号：${tableId}


<#if orderStatus?? && orderStatus == 1>
支付时间：${successDate} 
    <#if orderQuipment?? && orderQuipment != 5>
支付状态：已支付
    

变量判空

<#if mouse??>
  Mouse found
<#else>
  No mouse found

bugs

The following has evaluated to null or missing:
==> tableId  [in template "前台联.ftl" at line 12, column 6]

----
Tip: If the failing expression is known to legally refer to something that's sometimes null or missing, either specify a default value like myOptionalVar!myDefault, or use <#if myOptionalVar??>when-present<#else>when-missing. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----
错误代码：
<#if tableId != null && tableId != ''>
    
餐桌号：${tableId}