{"id":7148,"date":"2024-03-14T05:08:16","date_gmt":"2024-03-14T05:08:16","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-merge-cells-and-center-content-using-apache-poi-in-java\/"},"modified":"2025-08-02T12:35:32","modified_gmt":"2025-08-02T12:35:32","slug":"how-to-merge-cells-and-center-content-using-apache-poi-in-java","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-merge-cells-and-center-content-using-apache-poi-in-java\/","title":{"rendered":"Merge Excel Cells with Apache POI Java"},"content":{"rendered":"<p>You can use the Apache POI library to manipulate Excel files, such as merging cells and setting content to be centered. Below is a simple example code:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> org.apache.poi.ss.usermodel.*;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.poi.xssf.usermodel.XSSFWorkbook;\r\n\r\n<span class=\"hljs-keyword\">import<\/span> java.io.FileOutputStream;\r\n<span class=\"hljs-keyword\">import<\/span> java.io.IOException;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MergeCellsExample<\/span> {\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        <span class=\"hljs-keyword\">try<\/span> (<span class=\"hljs-type\">Workbook<\/span> <span class=\"hljs-variable\">workbook<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">XSSFWorkbook<\/span>()) {\r\n            <span class=\"hljs-type\">Sheet<\/span> <span class=\"hljs-variable\">sheet<\/span> <span class=\"hljs-operator\">=<\/span> workbook.createSheet(<span class=\"hljs-string\">\"Sheet1\"<\/span>);\r\n\r\n            <span class=\"hljs-type\">Row<\/span> <span class=\"hljs-variable\">row<\/span> <span class=\"hljs-operator\">=<\/span> sheet.createRow(<span class=\"hljs-number\">0<\/span>);\r\n            <span class=\"hljs-type\">Cell<\/span> <span class=\"hljs-variable\">cell<\/span> <span class=\"hljs-operator\">=<\/span> row.createCell(<span class=\"hljs-number\">0<\/span>);\r\n            cell.setCellValue(<span class=\"hljs-string\">\"Merged Cell\"<\/span>);\r\n            <span class=\"hljs-type\">CellStyle<\/span> <span class=\"hljs-variable\">style<\/span> <span class=\"hljs-operator\">=<\/span> workbook.createCellStyle();\r\n            style.setAlignment(HorizontalAlignment.CENTER);\r\n            style.setVerticalAlignment(VerticalAlignment.CENTER);\r\n            cell.setCellStyle(style);\r\n\r\n            sheet.addMergedRegion(<span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">CellRangeAddress<\/span>(<span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">0<\/span>, <span class=\"hljs-number\">5<\/span>));\r\n\r\n            <span class=\"hljs-keyword\">try<\/span> (<span class=\"hljs-type\">FileOutputStream<\/span> <span class=\"hljs-variable\">fileOut<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">FileOutputStream<\/span>(<span class=\"hljs-string\">\"workbook.xlsx\"<\/span>)) {\r\n                workbook.write(fileOut);\r\n            }\r\n        } <span class=\"hljs-keyword\">catch<\/span> (IOException e) {\r\n            e.printStackTrace();\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>In this example, we first create a new Workbook and Sheet object, then create a new Row and Cell object, and set the value of the cell to &#8220;Merged Cell&#8221;. Next, create a CellStyle object and set the horizontal and vertical alignment of the cell content to center. Then call the addMergedRegion method to merge the cells, and finally write the Workbook to a file.<\/p>\n<p>This way, the operation of merging cells and setting the content centered in an Excel file was achieved.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>You can use the Apache POI library to manipulate Excel files, such as merging cells and setting content to be centered. Below is a simple example code: import org.apache.poi.ss.usermodel.*; import org.apache.poi.xssf.usermodel.XSSFWorkbook; import java.io.FileOutputStream; import java.io.IOException; public class MergeCellsExample { public static void main(String[] args) { try (Workbook workbook = new XSSFWorkbook()) { Sheet sheet = [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[557,9118,9119,9116,9117],"class_list":["post-7148","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-apache-poi","tag-center-content","tag-excel-automation","tag-java-excel","tag-merge-cells"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Merge Excel Cells with Apache POI Java - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn to merge cells and center content in Excel using Apache POI in Java. 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