jar: itext-4.2.1.jar

Absolute positioning is required for the signing of many official documents, so record this code as follows:

PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream( "test.pdf" ));
PdfContentByte cb = writer.getDirectContent();
BaseFont bf = BaseFont.createFont( "STSong-Light" , "UniGB-UCS2-H" ,BaseFont.EMBEDDED);
cb .beginText();
cb .setFontAndSize(bf, 12 );
cb .showTextAligned(PdfContentByte.ALIGN_CENTER, text + "This text is centered" , 250 , 700 , 0 );
cb .endText();

Sometimes the absolute positioning of the picture (official seal) is also needed:

Image image = Image.getInstance(request.getSession().getServletContext().getRealPath( "/" )+ "common/images/starpilot/signet.png" ); 
image .scaleAbsolute(mmTopx( 40 ), mmTopx( 39 ));
image .setAbsolutePosition( 400 , flagHeight);
document .add(image);

Read More:

• JAVA: How to Convert PDF from Color to Grayscale
• JAVA: How to use the third-party font library method (using the third-party TTF / TTC font library method)
• Java will convert Excel to list set or JSON, export excel file to local, excel import and export, easyexcel tool class
• JAVA: How to Use Minio to upload pictures
• Java implementation of inputsteam to Base64
• JAVA: How to Use Multipartfile to upload Files
• OpenFeignClient Use Object to Receive text/plain Type Return Error
• [PROJECT] itdage java to get the weather and send text messages
• Java: How to Find the Minimum Value from a Random Array by Bubble Sort Method
• Linux: How to Solve jdk11+easy poi Export Excel Error
• The thread implementation of timer in Java
• Implementation of retrial mechanism in Java
• Java callback function implementation case
• Abstract method and static method of java interface
• How to Solve java server error (java application Run Normally)
• How to Use filechannel to copy files
• [Solved] Java POI export error: Invalid row number (65536) outside allowable range
• How to Converte Java objects to jsonnode in Jackson (Four Methods)
• How to Solve Springboot use thymeleaf template error
• JAVA 8: How to Convert List to Map