本文介绍如何使用Spire.PDF for Java在PDF文档中添加多级列表。
import com.spire.pdf.PdfDocument;
import com.spire.pdf.PdfNumberStyle;
import com.spire.pdf.PdfPageBase;
import com.spire.pdf.PdfPageSize;
import com.spire.pdf.graphics.*;
import com.spire.pdf.lists.PdfListItem;
import com.spire.pdf.lists.PdfOrderedMarker;
import com.spire.pdf.lists.PdfSortedList;
import java.awt.*;
import java.awt.geom.Point2D;
public class CreateMultiLevelList {
public static void main(String[] args) {
//创建PdfDocument对象
PdfDocument doc = new PdfDocument();
//设置页边距
PdfMargins margin = new PdfMargins(60, 60, 40, 40);
//添加一页
PdfPageBase page = doc.getPages().add(PdfPageSize.A4, margin);
//初始化x,y坐标
float x = 0;
float y = 15;
//创建两个画刷
PdfBrush blackBrush = PdfBrushes.getBlack();
PdfBrush purpleBrush = PdfBrushes.getPurple();
//创建两个字体
PdfTrueTypeFont titleFont = new PdfTrueTypeFont(new Font("微软雅黑",Font.BOLD,9),true);
PdfTrueTypeFont listFont = new PdfTrueTypeFont(new Font("微软雅黑",Font.PLAIN,9),true);
//在指定位置绘制标题
String title = "XHTML常见问题 :";
page.getCanvas().drawString(title, titleFont, blackBrush, x, y);
y = y + (float) titleFont.measureString(title).getHeight();
y = y + 5;
//创建两个ordered makers,用于设置有序列表的符号
PdfOrderedMarker marker1 = new PdfOrderedMarker(PdfNumberStyle.Upper_Roman, listFont);
PdfOrderedMarker marker2 = new PdfOrderedMarker(PdfNumberStyle.Numeric, listFont);
//创建一个父列表
String parentListContent = "XHTML 1.0简介\n"
+ "标签和属性语法介绍";
PdfSortedList parentList = new PdfSortedList(parentListContent);
parentList.setFont(listFont);
parentList.setIndent(8);
parentList.setBrush(purpleBrush);
parentList.setMarker(marker1);
//创建一个列表 - "subList_1"
String subListContent_1 = "什么是XHTML?\n"
+ "XHMTL文档是什么样的?\n"
+ "XHTML和HTML之间有什么关系?\n"
+ "XHTML和XML之间有什么关系?";
PdfSortedList subList_1 = new PdfSortedList(subListContent_1);
subList_1.setIndent(16);
subList_1.setFont(listFont);
subList_1.setBrush(purpleBrush);
subList_1.setMarker(marker2);
//创建另一个列表 -"subList_2"
String subListContent_2 = "什么是XHTML的元素?\n"
+ "如何在XHTML文档中添加注释?\n"
+ "如何为XHTML元素写一个开始标签?";
PdfSortedList subList_2 = new PdfSortedList(subListContent_2);
subList_2.setIndent(16);
subList_2.setFont(listFont);
subList_2.setBrush(purpleBrush);
subList_2.setMarker(marker2);
//将subList_1设置为父列表第一个元素下的子列表
PdfListItem item_1 = parentList.getItems().get(0);
item_1.setSubList(subList_1);
//将subList_2设置为父列表第二个元素下的子列表
PdfListItem item_2 = parentList.getItems().get(1);
item_2.setSubList(subList_2);
//绘制父列表到指定位置
PdfTextLayout textLayout = new PdfTextLayout();
textLayout.setBreak(PdfLayoutBreakType.Fit_Page);
textLayout.setLayout(PdfLayoutType.Paginate);
parentList.draw(page,new Point2D.Float(x,y),textLayout);
//保存文档
doc.saveToFile("MultiLevelList.pdf");
}
}