使用iText库生成PDF格式的分层书签 [英] Hierarchical Bookmark Generation in PDF using iText library

问题描述

我有 ArrayList 中的数据，如下所示：

  static ArrayList< DTONodeDetail>树; 
 public static void main（String [] args）{
 // TODO自动生成的方法stub 
 tree = new ArrayList< DTONodeDetail>（）; 
 
 //第一个参数 - > NodeId 
 // second-> NodeName 
 //第三个 - > ParentNodeId 
 
 tree.add（getDTO（1，Root，0））; 
 tree.add（getDTO（239，Node-1，1））; 
 tree.add（getDTO（242，Node-2，239））; 
 tree.add（getDTO（243，Node-3，239））; 
 tree.add（getDTO（244，Node-4，242））; 
 tree.add（getDTO（245，Node-5，243））; 
 displayTree（tree.get（0））; 
 
} 
 
 public static DTONodeDetail getDTO（int nodeId，String nodeName，int parentID）
 {
 DTONodeDetail dto = new DTONodeDetail（）; 
 dto.setNodeId（nodeId）; 
 dto.setNodeDisplayName（nodeName）; 
 dto.setParentID（parentID）; 
 
返回dto; 
} 
  

我能够在树结构中显示以上数据如下所示：

  Root 
 ----- Node-1 
 ------------ Node-2 
 ------------------ Node-4 
 ----- ------- Node-3 
 ------------------ Node-5 
  

我尝试使用章类的itext库，但无法知道如何生成分层书签。

我的问题是我可以使用 itext java库在pdf中创建分层书签（如上所述）吗？

解决方案

在PDF术语中，书签被称为轮廓。请从我的书中查看并在构建子大纲时将父大纲作为参数传递。

根据评论更新

还有一个名为 BookmarkedTimeTable的示例我们以完全不同的方式创建大纲树：

  ArrayList< HashMap< String，Object>> outlines = new ArrayList< HashMap< String，Object>>（）; 
 HashMap< String，Object> map = new HashMap< String，Object>（）; 
 outlines.add（map）; 
  

在这种情况下， map 是根我们可以添加分支和叶子的对象。完成后，我们将大纲树添加到 PdfStamper ，如下所示：

  stamper.setOutlines（轮廓）; 
  

请注意 PdfStamper 是我们需要的课程当我们操纵现有的PDF（而不是 PdfWriter ，当我们从头开始创建PDF时使用它）。

基于另一条评论的其他更新：

要创建层次结构，您只需要添加孩子。

第一级：

  HashMap< String，Object> calendar = new HashMap< String，Object>（）; 
 calendar.put（标题，日历）; 
  

第二级：

  HashMap< String，Object> day = new HashMap< String，Object>（）; 
 day.put（标题，星期一）; 
 ArrayList< HashMap< String，Object>> days = new ArrayList< HashMap< String，Object>>（）; 
 days.add（day）; 
 calendar.put（孩子们，天）; 
  

第三级：

  HashMap< String，Object> hour = new HashMap< String，Object>（）; 
 hour.put（标题，上午10点）; 
 ArrayList< HashMap< String，Object>> hours = new ArrayList< HashMap< String，Object>>（）; 
 hours.add（小时）; 
 day.put（孩子们，小时）; 
  

依此类推......

I have data in ArrayList like below :

static ArrayList<DTONodeDetail> tree;
public static void main(String[] args) {
    // TODO Auto-generated method stub
    tree=new ArrayList<DTONodeDetail>();

     //first argument->NodeId
     //second->NodeName
     // third -> ParentNodeId

    tree.add(getDTO(1,"Root",0));
    tree.add(getDTO(239,"Node-1",1));
    tree.add(getDTO(242,"Node-2",239));
    tree.add(getDTO(243,"Node-3",239));
    tree.add(getDTO(244,"Node-4",242));
    tree.add(getDTO(245,"Node-5",243));
    displayTree(tree.get(0));       

}

public static DTONodeDetail getDTO(int nodeId,String nodeName,int parentID)
{
    DTONodeDetail dto=new DTONodeDetail();
    dto.setNodeId(nodeId);
    dto.setNodeDisplayName(nodeName);
    dto.setParentID(parentID);

    return dto;
}

I am able to display above data in tree structure like below :

Root
-----Node-1
------------Node-2
------------------Node-4
------------Node-3
------------------Node-5

I have try Using Chapter class of itext library but unable to know how can i generate hierarchical bookmark.

My Question is can i create hierarchical bookmark(like above) in pdf using itext java library?

解决方案

In PDF terminology, bookmarks are referred to as outlines. Please take a look at the CreateOutline example from my book to find out how to create an outline tree as shown in this PDF: outline_tree.pdf

We start with the root of the tree:

PdfOutline root = writer.getRootOutline();

Then we add a branch:

PdfOutline movieBookmark = new PdfOutline(root, 
            new PdfDestination(
                PdfDestination.FITH, writer.getVerticalPosition(true)),
            title, true);

To this branch, we add a leaf:

PdfOutline link = new PdfOutline(movieBookmark,
            new PdfAction(String.format(RESOURCE, movie.getImdb())),
            "link to IMDB");

And so on.

The key is to use PdfOutline and to pass the parent outline as a parameter when constructing a child outline.

Update based on comment:

There's also an example called BookmarkedTimeTable where we create the outline tree in a completely different way:

ArrayList<HashMap<String, Object>> outlines = new ArrayList<HashMap<String, Object>>();
HashMap<String, Object> map = new HashMap<String, Object>();
outlines.add(map);

In this case, map is the root object to which we can add branches and leaves. Once we're finished, we add the outline tree to the PdfStamper like this:

stamper.setOutlines(outlines);

Note that PdfStamper is the class we need when we manipulate an existing PDF (as opposed to PdfWriter which is to be used when we create a PDF from scratch).

Additional update based on yet another comment:

To create a hierarchy, you just need to add kids.

First level:

HashMap<String, Object> calendar = new HashMap<String, Object>();
calendar.put("Title", "Calendar");

Second level:

HashMap<String, Object> day = new HashMap<String, Object>();
day.put("Title", "Monday");
ArrayList<HashMap<String, Object>> days = new ArrayList<HashMap<String, Object>>();
days.add(day);
calendar.put("Kids", days);

Third level:

HashMap<String, Object> hour = new HashMap<String, Object>();
hour.put("Title", "10 AM");
ArrayList<HashMap<String, Object>> hours = new ArrayList<HashMap<String, Object>>();
hours.add(hour);
day.put("Kids", hours);

And so on...

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