85 lines
2.4 KiB
Java
85 lines
2.4 KiB
Java
package com.supervision.util.freemark;
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import cn.hutool.core.collection.CollUtil;
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import cn.hutool.core.util.StrUtil;
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import cn.hutool.crypto.digest.MD5;
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import freemarker.cache.StringTemplateLoader;
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import freemarker.template.Configuration;
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import freemarker.template.Template;
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import freemarker.template.TemplateException;
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import java.io.IOException;
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import java.io.StringWriter;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Objects;
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public class StringTemplateConfig {
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private final Configuration configuration;
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private final StringTemplateLoader loader;
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private final Map<String, String> tempMap = new HashMap<>();
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private static class SingletonHolder {
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private static final StringTemplateConfig INSTANCE = new StringTemplateConfig();
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}
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private StringTemplateConfig() {
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configuration = new Configuration(Configuration.VERSION_2_3_30);
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loader = new StringTemplateLoader();
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configuration.setTemplateLoader(loader);
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}
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public static StringTemplateConfig getInstance() {
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return SingletonHolder.INSTANCE;
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}
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public Template getTemplate(String name) throws IOException {
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if (!tempMap.containsKey(name)) {
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return null;
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}
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return this.configuration.getTemplate(name);
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}
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public void putTemplate(String name, String content){
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tempMap.put(name, content);
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this.loader.putTemplate(name, content);
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}
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public boolean removeTemplate(String name){
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if (tempMap.remove(name) != null){
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return this.loader.removeTemplate(name);
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}
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return true;
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}
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public String process(String content, List<Map<String, Object>> data) throws IOException, TemplateException {
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if (StrUtil.isEmpty(content)) {
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return null;
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}
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String name = contentToName(content);
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if (Objects.isNull(tempMap.get(name))) {
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this.putTemplate(name, content);
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}
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Template template = this.getTemplate(name);
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StringWriter out = new StringWriter();
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Map<String, Object> dataModel = new HashMap<>();
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if (CollUtil.size(data) > 1){
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dataModel.put("list", data);
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}else {
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dataModel= CollUtil.getFirst(data);
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}
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template.process(dataModel, out);
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return out.toString();
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}
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public String contentToName(String content){
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return MD5.create().digestHex16(content);
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}
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}
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