Alfresco中的用户/组水印是指根据用户或用户组为文档添加不同的水印。通过这种方法，可以为不同的用户或用户组提供个性化的文件内容控制。下面是基于用户/组的水印的示例代码：

首先，需要创建水印模板。可以使用Java Graphics2D库创建水印模板，如下所示：

private BufferedImage createWatermarkImage(String watermarkText) { BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB); Graphics2D g2d = img.createGraphics(); Font font = new Font("Arial", Font.PLAIN, 30); g2d.setFont(font); FontMetrics fm = g2d.getFontMetrics(); int width = fm.stringWidth(watermarkText); int height = fm.getHeight(); g2d.dispose();

img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
g2d = img.createGraphics();
g2d.setFont(font);
g2d.setColor(Color.WHITE);
g2d.drawString(watermarkText, 0, fm.getAscent());
g2d.dispose();

return img;

}

然后，需要在文档上应用水印。可以使用Alfresco JavaScript API在文档创建或修改时应用水印，如下所示：

function watermark(node) { var siteRole; if (people.isAdmin(person)) { // If user is an admin, show watermark "Confidential" siteRole = "Confidential"; } else { // Else, show the user's site role as watermark siteRole = people.getContainerRoles(node)[0].displayPath; }

var watermarkText = siteRole + " - " + node.name;
var watermarkImage = createWatermarkImage(watermarkText);

var nodeContent = node.content;

var originalContentReader = nodeContent.getReader();

var outputStringWriter = new StringWriter();
IOUtils.copy(originalContentReader, outputStringWriter);
outputStringWriter.close();

// Add the watermark as an overlay
var watermarkContentWriter = new OutputStreamWriter(nodeContent.getOutputStream());
var params = new HashMap();
params.put("watermarkImage", watermarkImage);

var overlay = new ImageWatermarkOverlay();
overlay.setMimeType(node.mimetype);
overlay.setParams(params);

overlay.writeContent(originalContentReader, watermarkContentWriter, new HashMap());

watermarkContentWriter.flush();
watermarkContentWriter.close();

}

以上代码将用户/组信息作为水印文本添加到文档中。可以根据需要进行修改，以满足特定的业务需求。