用JAVA寫的word模板自動生成引擎

大家好，我是TJ

一個勵志推薦10000款開源項目與工具的程序員

TJ君做項目的時候最頭疼什么？當(dāng)然是寫各種文檔啦，尤其是在大公司做項目，各種規(guī)范文檔不可少，雖然說一個成熟的項目管理過程中的確是要依靠各種文檔來明確項目里程碑及具體的設(shè)計確認和需求分工，但是TJ君還是更喜歡把時間花在開發(fā)代碼上。

尤其是有些文檔的格式都差不多，那是不是我們程序猿可以發(fā)揮特長，用程序來生成輸出指定的word文檔，減少自己的手寫時間呢？

當(dāng)然是可以的！

今天TJ君就要給大家分享一款Word專用的模板引擎，Poi-tl(Poi-template-language)。這款引擎基于Apache Poi，可以根據(jù)用戶輸入的內(nèi)容直接生成相應(yīng)的word文檔，很是方便。

Apache Poi是用Java編寫的一款免費開源的跨平臺的JavaAPI，該API可以通過Java程序?qū)ffice格式文檔進行讀寫操作，可以說是現(xiàn)階段Java庫當(dāng)中最好用的office處理庫了，可能都不用加之一兩個字。所以基于Apache Poi的Poi-tl可以讓你在word文檔的任何地方做任何你想做的事情。

舉個例子，如果想生成一個名叫TJ君真棒.docx的文檔，并且在文檔里包含文本{{title}}，只需要一句代碼，這句代碼也是整個引擎的核心所在：

//核心API采用了極簡設(shè)計，只需要一行代碼
XWPFTemplate.compile("TJ君真棒.docx").render(new?HashMap(){{
????????put("title",?"Poi-tl?模板引擎");
}}).writeToFile("out_TJ君真棒.docx");

Poi-tl整體設(shè)計采用了Template + data-model = output模式.

Configure提供了模板配置功能，比如語法配置和插件配置:

/**
?*?插件化配置
?*?
?*?@author?Sayi
?*?@version?1.0.0
?*/
public?class?Configure?{

????//?defalut?expression
????private?static?final?String?DEFAULT_GRAMER_REGEX?=?"[\\w\\u4e00-\\u9fa5]+(\\.[\\w\\u4e00-\\u9fa5]+)*";

????//?Highest?priority
????private?Map?customPolicys?=?new?HashMap();
????//?Low?priority
????private?Map?defaultPolicys?=?new?HashMap();

????/**
?????*?引用渲染策略
?????*/
????private?List>?referencePolicies?=?new?ArrayList<>();

????/**
?????*?語法前綴
?????*/
????private?String?gramerPrefix?=?"{{";
????/**
?????*?語法后綴
?????*/
????private?String?gramerSuffix?=?"}}";

????/**
?????*?默認支持中文、字母、數(shù)字、下劃線的正則
?????*/
????private?String?grammerRegex?=?DEFAULT_GRAMER_REGEX;

????/**
?????*?模板表達式模式，默認為POI_TL_MODE
?????*/
????private?ELMode?elMode?=?ELMode.POI_TL_STANDARD_MODE;

????/**
?????*?渲染數(shù)據(jù)校驗不通過時的處理策略
?????*?

?????*?
DiscardHandler:?什么都不做

?????*?
ClearHandler:?清空標(biāo)簽

?????*?
AbortHandler:?拋出異常

?????*?

?????*/
????private?ValidErrorHandler?handler?=?new?ClearHandler();

????private?Configure()?{
????????plugin(GramerSymbol.TEXT,?new?TextRenderPolicy());
????????plugin(GramerSymbol.IMAGE,?new?PictureRenderPolicy());
????????plugin(GramerSymbol.TABLE,?new?MiniTableRenderPolicy());
????????plugin(GramerSymbol.NUMBERIC,?new?NumbericRenderPolicy());
????????plugin(GramerSymbol.DOCX_TEMPLATE,?new?DocxRenderPolicy());
????}

????/**
?????*?創(chuàng)建默認配置
?????*?
?????*?@return
?????*/
????public?static?Configure?createDefault()?{
????????return?newBuilder().build();
????}

????/**
?????*?構(gòu)建器
?????*?
?????*?@return
?????*/
????public?static?ConfigureBuilder?newBuilder()?{
????????return?new?ConfigureBuilder();
????}

????/**
?????*?新增或變更語法插件
?????*?
?????*?@param?c
?????*????????????語法
?????*?@param?policy
?????*????????????策略
?????*/
????public?Configure?plugin(char?c,?RenderPolicy?policy)?{
????????defaultPolicys.put(Character.valueOf(c),?policy);
????????return?this;
????}

????/**
?????*?新增或變更語法插件
?????*?
?????*?@param?symbol
?????*????????????語法
?????*?@param?policy
?????*????????????策略
?????*?@return
?????*/
????Configure?plugin(GramerSymbol?symbol,?RenderPolicy?policy)?{
????????defaultPolicys.put(symbol.getSymbol(),?policy);
????????return?this;
????}

????/**
?????*?自定義模板和策略
?????*?
?????*?@param?tagName
?????*????????????模板名稱
?????*?@param?policy
?????*????????????策略
?????*/
????public?void?customPolicy(String?tagName,?RenderPolicy?policy)?{
????????customPolicys.put(tagName,?policy);
????}

????/**
?????*?新增引用渲染策略
?????*?
?????*?@param?policy
?????*/
????public?void?referencePolicy(ReferenceRenderPolicy?policy)?{
????????referencePolicies.add(policy);
????}

????/**
?????*?獲取標(biāo)簽策略
?????*?
?????*?@param?tagName
?????*????????????模板名稱
?????*?@param?sign
?????*????????????語法
?????*/
????//?Query?Operations

????public?RenderPolicy?getPolicy(String?tagName,?Character?sign)?{
????????RenderPolicy?policy?=?getCustomPolicy(tagName);
????????return?null?==?policy???getDefaultPolicy(sign)?:?policy;
????}

????public?List>?getReferencePolicies()?{
????????return?referencePolicies;
????}
????
????private?RenderPolicy?getCustomPolicy(String?tagName)?{
????????return?customPolicys.get(tagName);
????}

????private?RenderPolicy?getDefaultPolicy(Character?sign)?{
????????return?defaultPolicys.get(sign);
????}

????public?Map?getDefaultPolicys()?{
????????return?defaultPolicys;
????}

????public?Map?getCustomPolicys()?{
????????return?customPolicys;
????}

????public?Set?getGramerChars()?{
????????return?defaultPolicys.keySet();
????}

????public?String?getGramerPrefix()?{
????????return?gramerPrefix;
????}

????public?String?getGramerSuffix()?{
????????return?gramerSuffix;
????}

????public?String?getGrammerRegex()?{
????????return?grammerRegex;
????}

????public?ELMode?getElMode()?{
????????return?elMode;
????}

????public?ValidErrorHandler?getValidErrorHandler()?{
????????return?handler;
????}

????public?static?class?ConfigureBuilder?{
????????private?boolean?regexForAll;
????????private?Configure?config;

????????public?ConfigureBuilder()?{
????????????config?=?new?Configure();
????????}

????????public?ConfigureBuilder?buildGramer(String?prefix,?String?suffix)?{
????????????config.gramerPrefix?=?prefix;
????????????config.gramerSuffix?=?suffix;
????????????return?this;
????????}

????????public?ConfigureBuilder?buildGrammerRegex(String?reg)?{
????????????config.grammerRegex?=?reg;
????????????return?this;
????????}

????????public?ConfigureBuilder?supportGrammerRegexForAll()?{
????????????this.regexForAll?=?true;
????????????return?this;
????????}

????????public?ConfigureBuilder?setElMode(ELMode?mode)?{
????????????config.elMode?=?mode;
????????????return?this;
????????}

????????public?ConfigureBuilder?setValidErrorHandler(ValidErrorHandler?handler)?{
????????????config.handler?=?handler;
????????????return?this;
????????}

????????public?ConfigureBuilder?addPlugin(char?c,?RenderPolicy?policy)?{
????????????config.plugin(c,?policy);
????????????return?this;
????????}

????????public?ConfigureBuilder?customPolicy(String?tagName,?RenderPolicy?policy)?{
????????????config.customPolicy(tagName,?policy);
????????????return?this;
????????}

????????public?ConfigureBuilder?referencePolicy(ReferenceRenderPolicy?policy)?{
????????????config.referencePolicy(policy);
????????????return?this;
????????}

????????public?ConfigureBuilder?bind(String?tagName,?RenderPolicy?policy)?{
????????????config.customPolicy(tagName,?policy);
????????????return?this;
????????}

????????public?Configure?build()?{
????????????if?(config.elMode?==?ELMode.SPEL_MODE)?{
????????????????regexForAll?=?true;
????????????}
????????????if?(regexForAll)?{
????????????????config.grammerRegex?=?RegexUtils.createGeneral(config.gramerPrefix,
????????????????????????config.gramerSuffix);
????????????}
????????????return?config;
????????}
????}
}

Visitor提供了模板解析功能:

/**
?*?模板解析器
?*?
?*?@author?Sayi
?*?@version?1.4.0
?*/
public?class?TemplateVisitor?implements?Visitor?{
????private?static?Logger?logger?=?LoggerFactory.getLogger(TemplateVisitor.class);

????private?Configure?config;
????private?List?eleTemplates;

????private?Pattern?templatePattern;
????private?Pattern?gramerPattern;

????static?final?String?FORMAT_TEMPLATE?=?"{0}{1}{2}{3}";
????static?final?String?FORMAT_GRAMER?=?"({0})|({1})";

????public?TemplateVisitor(Configure?config)?{
????????this.config?=?config;
????????initPattern();
????}

????@Override
????public?List?visitDocument(XWPFDocument?doc)?{
????????if?(null?==?doc)?return?null;
????????this.eleTemplates?=?new?ArrayList();
????????logger.info("Visit?the?document?start...");
????????visitParagraphs(doc.getParagraphs());
????????visitTables(doc.getTables());
????????visitHeaders(doc.getHeaderList());
????????visitFooters(doc.getFooterList());
????????logger.info("Visit?the?document?end,?resolve?and?create?{}?ElementTemplates.",
????????????????this.eleTemplates.size());
????????return?eleTemplates;
????}

????void?visitHeaders(List?headers)?{
????????if?(null?==?headers)?return;
????????for?(XWPFHeader?header?:?headers)?{
????????????visitParagraphs(header.getParagraphs());
????????????visitTables(header.getTables());
????????}
????}

????void?visitFooters(List?footers)?{
????????if?(null?==?footers)?return;
????????for?(XWPFFooter?footer?:?footers)?{
????????????visitParagraphs(footer.getParagraphs());
????????????visitTables(footer.getTables());
????????}
????}

????void?visitParagraphs(List?paragraphs)?{
????????if?(null?==?paragraphs)?return;
????????for?(XWPFParagraph?paragraph?:?paragraphs)?{
????????????visitParagraph(paragraph);
????????}
????}

????void?visitTables(List?tables)?{
????????if?(null?==?tables)?return;
????????for?(XWPFTable?tb?:?tables)?{
????????????visitTable(tb);
????????}
????}

????void?visitTable(XWPFTable?table)?{
????????if?(null?==?table)?return;
????????List?rows?=?table.getRows();
????????if?(null?==?rows)?return;
????????for?(XWPFTableRow?row?:?rows)?{
????????????List?cells?=?row.getTableCells();
????????????if?(null?==?cells)?continue;
????????????for?(XWPFTableCell?cell?:?cells)?{
????????????????visitParagraphs(cell.getParagraphs());
????????????????visitTables(cell.getTables());
????????????}
????????}
????}

????void?visitParagraph(XWPFParagraph?paragraph)?{
????????if?(null?==?paragraph)?return;
????????RunningRunParagraph?runningRun?=?new?RunningRunParagraph(paragraph,?templatePattern);
????????List?refactorRun?=?runningRun.refactorRun();
????????if?(null?==?refactorRun)?return;
????????for?(XWPFRun?run?:?refactorRun)?{
????????????visitRun(run);
????????}
????}

????void?visitRun(XWPFRun?run)?{
????????String?text?=?null;
????????if?(null?==?run?||?StringUtils.isBlank(text?=?run.getText(0)))?return;
????????ElementTemplate?elementTemplate?=?parseTemplateFactory(text,?run);
????????if?(null?!=?elementTemplate)?eleTemplates.add(elementTemplate);
????}

????private??ElementTemplate?parseTemplateFactory(String?text,?T?obj)?{
????????logger.debug("Resolve?where?text:?{},?and?create?ElementTemplate",?text);
????????//?temp?,future?need?to?word?analyze
????????if?(templatePattern.matcher(text).matches())?{
????????????String?tag?=?gramerPattern.matcher(text).replaceAll("").trim();
????????????if?(obj.getClass()?==?XWPFRun.class)?{
????????????????return?TemplateFactory.createRunTemplate(tag,?config,?(XWPFRun)?obj);
????????????}?else?if?(obj.getClass()?==?XWPFTableCell.class)
????????????????//?return?CellTemplate.create(symbol,?tagName,?(XWPFTableCell)
????????????????//?obj);
????????????????return?null;
????????}
????????return?null;
????}

????private?void?initPattern()?{
????????String?signRegex?=?getGramarRegex(config);
????????String?prefixRegex?=?RegexUtils.escapeExprSpecialWord(config.getGramerPrefix());
????????String?suffixRegex?=?RegexUtils.escapeExprSpecialWord(config.getGramerSuffix());

????????templatePattern?=?Pattern.compile(MessageFormat.format(FORMAT_TEMPLATE,?prefixRegex,
????????????????signRegex,?config.getGrammerRegex(),?suffixRegex));
????????gramerPattern?=?Pattern
????????????????.compile(MessageFormat.format(FORMAT_GRAMER,?prefixRegex,?suffixRegex));
????}

????private?String?getGramarRegex(Configure?config)?{
????????List?gramerChar?=?new?ArrayList(config.getGramerChars());
????????StringBuilder?reg?=?new?StringBuilder("(");
????????for?(int?i?=?0;;?i++)?{
????????????Character?chara?=?gramerChar.get(i);
????????????String?escapeExprSpecialWord?=?RegexUtils.escapeExprSpecialWord(chara.toString());
????????????if?(i?==?gramerChar.size()?-?1)?{
????????????????reg.append(escapeExprSpecialWord).append(")?");
????????????????break;
????????????}?else?reg.append(escapeExprSpecialWord).append("|");
????????}
????????return?reg.toString();
????}

}

最后，RenderPolicy是渲染策略擴展點，Render模塊提供了RenderDataCompute表達式計算擴展點，通過RenderPolicy對每個標(biāo)簽進行渲染。

當(dāng)然，如果想將Poi-tl用的好的話，還是要花一點時間來研究其中具體模塊的語法，好在Poi-tl提供詳細的示例代碼講解，小伙伴們只要用心學(xué)一下，很快就能掌握的

到底能不能讓小伙伴們減輕寫文檔的壓力呢？記得用過之后來給TJ君反饋哦！想用的小伙伴，完整項目地址在這里：

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