{"id":1196,"date":"2012-05-29T16:00:00","date_gmt":"2012-05-29T16:00:00","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/2012\/10\/using-groovy-scriptlets-inside-a-docx-document.html"},"modified":"2012-10-26T08:31:56","modified_gmt":"2012-10-26T08:31:56","slug":"using-groovy-scriptlets-inside-docx","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2012\/05\/using-groovy-scriptlets-inside-docx.html","title":{"rendered":"Using Groovy scriptlets inside a *.docx document"},"content":{"rendered":"
Introduction<\/strong><\/p>\n

One of my recent projects required automated generation of contracts for customers. Contract is a legal document of about 10 pages length. One contract form can be applied for many customers so the document is a template with customer info put in certain places. <\/p>\n

In this article I am going to show you how I solved this problem. <\/p>\n

Requirements<\/strong><\/p>\n

This is an initial version of formalized requirements : <\/p>\n

Specified data must be placed in marked places of a complex DOC\/DOCX file<\/i><\/p>\n

The requirements were subsequently refined and expanded : <\/p>\n

    \n
  1. Specified data must be placed in marked places of a complex DOCX file.<\/i><\/li>\n
  2. Output markup must be scriptlet-like: ${}, <%%>, <%=%>.<\/i><\/li>\n
  3. Output data may be not only strings but also hashes and objects. Field access must be an option.<\/i><\/li>\n
  4. Output language must be brief and script-friendly: Groovy, JavaScript.<\/i><\/li>\n
  5. A possibility to display list of objects in a table, each cell displaying a field.<\/i><\/li>\n<\/ol>\n

    Background<\/strong><\/p>\n

    It turned out that the existing products in the field (I’m talking about Java world) do not fit into initial requirements. <\/p>\n

    A brief overview of the products: <\/p>\n

    Jasper reports<\/strong><\/p>\n

    Jasper Reports<\/a>uses *.jrxml files as templates. Template file in combination with input data (SQL result set or a Map of params) are given to a processor which forms any of these formats: PDF, XML, HTML, CSV, XLS, RTF, TXT. <\/p>\n

    Did not fit in: <\/p>\n

      \n
    1. It\u2019s not a WYSIWYG, even with help of iReport \u2014 a visual tool to create jrxml-templates.<\/li>\n
    2. JasperReports API must be learned well to create and style a complex template.<\/li>\n
    3. JR does not output in a suitable format. PDF might be okay, but ability of hand-editing is preferable.<\/li>\n<\/ol>\n

      Docx4java<\/strong><\/p>\n

      Docx4j<\/a>is a Java library for creating and manipulating Microsoft Open XML (Word docx, Powerpoint pptx, and Excel xlsx) files. <\/p>\n

       Did not fit in: <\/p>\n

        \n
      1. There is no case meeting my requirements in docx4java documentation<\/a>. A brief note about XMLUtils.unmarshallFromTemplate functionality is present but it only does simpliest substitutions. <\/li>\n
      2. Repeats of output is done with prepared XML-sources and XPath, link<\/a><\/li>\n<\/ol>\n

        Apache POI<\/strong>

        <\/div> <\/div><\/p>\n

        Apache POI<\/a> is a Java tool for creating and manipulating parts of *. doc, *.ppt, *.xls documents. A major use of the Apache POI api is for Text Extraction applications such as web spiders, index builders, and content management systems. <\/p>\n

        Did not fit in: <\/p>\n

          \n
        1. Does not have any options that meet my requirements.<\/li>\n<\/ol>\n

          Word Content Control Toolkit<\/strong><\/p>\n

          Word Content Control Toolkit<\/a> is a stand-alone, light-weight tool that opens any Word Open XML document and lists all of the content controls inside of it. <\/p>\n

          After I developed my own solution with scriptlets I heard of a solution based on combination of this tool and XSDT-transformations. It may work for somebody but I did not bother digging because it simply takes less steps to use my solution straightforward. <\/p>\n

          Solution of the problem<\/strong><\/p>\n

          It was fun! <\/p>\n

          1<\/strong>. Document text content is stored as Open XML file inside a zip-archive. Traditional JDK 6 zipper does not support an explicit encoding parameter. That is, a broken docx-file may be produced using this zipper. I had to use a Groovy-wrapper AntBuilder for zipping, which does have an encoding parameter. <\/p>\n

          2<\/strong>. Any text inside you enter in MS Word may be \u201carbitrary\u201d broken into parts wrapped with XML. So, I had to solve the problem of cleaning pads generated from the template xml. I used regular expressions for this task. I did not try to use XSLT or anything because I thought RegEx would be faster. <\/p>\n

          3<\/strong>. I decided to use Groovy as a scripting language because of its simplicity, Java-nature, and a built-in template processor<\/a>. I found an interesting issue related to the processor. It turned out that even in a small 10-sheet document one can easily run into a restriction on the length of a string between two scriptlets.
          \nI had to substitute the text going between a pair of scriptlets with a UUID-string, run the Groovy template processor using the modified text, and finally swich back those UUID-placeholders with the initial text fragments. <\/p>\n

          After overcoming these difficulties, I tried out the project in real life. It turned out well! <\/p>\n

          I created a project website and published it. <\/p>\n

          Project address: snowindy.github.com\/scriptlet4docx\/<\/a><\/p>\n

          Code example<\/strong><\/p>\n

          HashMap<String, Object> params = new HashMap<String, Object>();\r\nparams.put(\"name\",\"John\");\r\nparams.put(\"sirname\",\"Smith\");\r\n\r\nDocxTemplater docxTemplater = new DocxTemplater(new File(\"path_to_docx_template\/template.docx\"));\r\ndocxTemplater.process(new File(\"path_to_result_docx\/result.docx\"), params); \r\n<\/pre>\n
          Scriptlet types explanation<\/strong><\/p>\n
          ${ data }<\/strong>
          \nEquivalent to out.print(data) <\/p>\n
          <%= data %><\/strong>
          \nEquivalent to out.print(data) <\/p>\n
          <% any_code %><\/strong>
          \nEvaluates containing code. No output applied. May be used for divided conditions: <\/p>\n
          <% if (cond) { %>\r\nThis text block will be printed in case of \"cond == true\"\r\n<% } else { %>\r\nThis text block will be printed otherwise.\r\n<% } %> \r\n<\/pre>\n
          $[ @listVar.field ]<\/strong><\/p>\n
          This is a custom Scriptlet4docx scriptlet type designed to output collection of objects to docx tables. It must be used inside a table cell. <\/p>\n
          Say, we have a list of person objects. Each has two fields: ‘name’ and ‘address’. We want to output them to a two-column table. <\/p>\n
            \n
          1. Create a binding with key ‘personList’ referencing that collection.<\/li>\n
          2. Create a two-column table inside a template docx-document: two columns, one row.<\/li>\n
          3. $[@person.name] goes to the first column cell; $[@person.address] goes to the second.<\/li>\n
          4. Voila, the whole collection will be printed to the table.<\/li>\n<\/ol>\n
            Live template example<\/strong><\/p>\n
            You can check all mentioned scriptlets usage in a demonstration template<\/a><\/p>\n
            Project future<\/strong><\/p>\n
            If I actually developed a new approach to processing docx-templates, it would be nice to popularize it. <\/p>\n
            Projects TODOs: <\/p>\n
              \n
            1. Preprocessed templates caching,<\/li>\n
            2. Scriptlets support in lists<\/li>\n
            3. Streaming API<\/li>\n<\/ol>\n
              Reference: <\/i><\/strong>Using Groovy scriptlets inside a *.docx document<\/i> from our W4G partner<\/a> Eugene Polyhaev<\/a>   <\/div>\n","protected":false},"excerpt":{"rendered":"
              Introduction One of my recent projects required automated generation of contracts for customers. Contract is a legal document of about 10 pages length. One contract form can be applied for many customers so the document is a template with customer info put in certain places. In this article I am going to show you how …<\/p>\n","protected":false},"author":314,"featured_media":132,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[480,481,479,206],"class_list":["post-1196","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-groovy","tag-eugene-polyhaev","tag-script","tag-templates-word","tag-w4g"],"yoast_head":"\nUsing Groovy scriptlets inside a *.docx document - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Introduction One of my recent projects required automated generation of contracts for customers. 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