嘗試使用freemarker模板引擎生成打印文件
參考
freemarker中文
freemarker官網
依賴
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.2.RELEASE</version>
<relativePath/>
</parent>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-freemarker</artifactId>
</dependency>
測試代碼
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<String, Object> 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<String, Object> 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("前台聯.ftl");
//將輸出打印到控制台
Writer out = new OutputStreamWriter(System.out);
//將輸出結果轉換為字符串
StringWriter stringWriter = new StringWriter();
temp.process(root, stringWriter);
String result = stringWriter.toString();
System.out.println(result);
}
}
模板文件
<html>
<head><meta http-equiv='Content-Type' content='text/html; charset=UTF-8' /></head>
<body>
<#if orderQuipment == 1>
<p style='text-align:center;font-size: 48px;font-weight: bold;'>預點餐前台聯</p>
<#elseif orderQuipment == 6>
<p style='text-align:center;font-size: 48px;font-weight: bold;'>外賣前台聯</p>
<#else>
<p style='text-align:center;font-size: 48px;font-weight: bold;'>前台聯</p>
</#if>
<#if tableId?? && tableId != ''>
<p style='text-align:center;font-size: 48px;font-weight: bold;'>餐桌號：${tableId}</p>
</#if>
<#if orderStatus?? && orderStatus == 1>
<p style='Width:100%;text-align: left;font-weight: bold;'>支付時間：${successDate} </p>
<#if orderQuipment?? && orderQuipment != 5>
<p style='Width:100%;text-align: left;font-weight: bold;'>支付狀態：已支付</p>
</#if>
</#if>
</body>
</html>
變量判空
<#if mouse??>
Mouse found
<#else>
No mouse found
</#if>
bugs
The following has evaluated to null or missing:
==> tableId [in template "前台聯.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</#if>. (These only cover the last step of the expression; to cover the whole expression, use parenthesis: (myOptionalVar.foo)!myDefault, (myOptionalVar.foo)??
----
錯誤代碼：
<#if tableId != null && tableId != ''>
<p style='text-align:center;font-size: 48px;font-weight: bold;'>餐桌號：${tableId}</p>
</#if>
