SpringBoot获取Freemarker模板引擎，生成HTML代码

今天用Ajax异步添加评论，加载Freemarker模板引擎，生成模板模块

1.新建Freemarker模板

1<li id="${comment.oId}">
2    <div>
3        <div class="avatar tooltipped tooltipped-n" aria-label="${comment.commentName}"
4             style="background-image: url(${comment.commentThumbnailURL})"></div>
5        <main>
6            <div class="fn-clear">
7                <#if "http://" == comment.commentURL>
8                ${comment.commentName}
9                <#else>
10                <a class="user-name" href="${comment.commentURL}" target="_blank">${comment.commentName}</a>
11                </#if>
12                <#if comment.isReply>
13                @<a class="user-name" href="/${article.articlePermalink}#${comment.commentOriginalCommentId}"
14                   onmouseover="page.showComment(this, '${comment.commentOriginalCommentId}', 23);"
15                   onmouseout="page.hideComment('${comment.commentOriginalCommentId}')"
16                >${comment.commentOriginalCommentName}</a>
17                </#if>
18                <time class="ft-gray">${comment.commentDate?string("yyyy-MM-dd HH:mm")}</time>
19
20                <#if article.articleCommentable==1>
21                    <a class="reply-btn" href="javascript:replyTo('${comment.oId}')">${replyLabel}</a>
22                </#if>
23            </div>
24            <div class="content-reset">
25                ${comment.commentContent}
26            </div>
27        </main>
28    </div>
29</li>

2.新建FreemarkerUtils工具类

1package com.fdzang.mblog.utils;
2
3import freemarker.template.Configuration;
4import freemarker.template.Template;
5import freemarker.template.TemplateException;
6import freemarker.template.TemplateExceptionHandler;
7
8import java.io.File;
9import java.io.IOException;
10import java.io.StringWriter;
11import java.util.Map;
12
13public class FreemarkerUtils {
14    public static String getTemplate(String template, Map<String,Object> map) throws IOException, TemplateException {
15        Configuration cfg = new Configuration(Configuration.VERSION_2_3_28);
16        String templatePath = FreemarkerUtils.class.getResource("/").getPath()+"/templates";
17        cfg.setDirectoryForTemplateLoading(new File(templatePath));
18        cfg.setDefaultEncoding("UTF-8");
19        cfg.setTemplateExceptionHandler(TemplateExceptionHandler.RETHROW_HANDLER);
20        cfg.setLogTemplateExceptions(false);
21        cfg.setWrapUncheckedExceptions(true);
22        Template temp = cfg.getTemplate(template);
23        StringWriter stringWriter = new StringWriter();
24        temp.process(map, stringWriter);
25        return stringWriter.toString();
26    }
27}

template为模板的名称，Map为需要插入的参数

关于加载模板位置的方法，借鉴于

https://blog.csdn.net/gtlishujie/article/details/52300381

我就不多加累述了，关键在于获取文件路径，文件路径不对的话，可以试着输出然后调试，个人推荐文件加载这个方法

3.Controller层的方法

1Map<String,Object> map=new HashMap<>();
2map.put("article",article);
3map.put("comment",comment);
4map.put("replyLabel","回复");
5String cmtTpl= FreemarkerUtils.getTemplate("common-comment.ftl",map);
6result.setCmtTpl(cmtTpl);

定义好Map参数，指定加载的模板引擎，就可以得到解析后的HTML了