创建itext document&横向打印
概述
Document是itext的基础,你可以添加文档数据(用户阅读的信息)和元数据(pdf内部使用的信息)。在创建document对象时,你可以定义page size,page color and page margins。
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构造函数?
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查看一下API,Document的构造函数有三个。
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其中第一个Document给size,color,margins都设置了默认值。查看源代码,默认为Document(PageSize.A4, 36, 36, 36, 36);
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第二个构造函数就可以自定义页面的大小了,例如:
Rectangle rect = new Rectangle(800,600);Document document = new Document(rect);
?Rectangle指定了宽为800,高位600的页面。
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Rectangle?
在这里有必要看看Rectangle
我们看看一个函数做了什么
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/** * Constructs a <CODE>Rectangle</CODE> -object starting from the origin * (0, 0). * * @param urx * upper right x * @param ury * upper right y */public Rectangle(float urx, float ury) {this(0, 0, urx, ury);}
?哦,原来是左下角(0,0)为起点,右上角为宽高。如图所示:
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当然,通过public Rectangle(float llx, float lly, float urx, float ury)可以随意改变左下角的位置。
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/** * Constructs a <CODE>Rectangle</CODE> -object. * * @param llx * lower left x * @param lly * lower left y * @param urx * upper right x * @param ury * upper right y */public Rectangle(float llx, float lly, float urx, float ury) {this.llx = llx;this.lly = lly;this.urx = urx;this.ury = ury;}?Page Size
理论上将,你可以随意的创建页面的大小,但是不同的PDF规范,强制规范了页面的大小。这一点,比较抽象,我就不详细介绍了,具体可以翻阅itext_in_action_2006 2.1.1小结。
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Itext提供了一个很实用的类PageSize,它的作用就是返回static final Rectangle对象的集合。提供了标准化的页面大小。例如:
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Document document = new Document(PageSize.A4)横向打印
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接下来有个很有趣的函数rotate()。
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在打印的时候,经常需要横向打印。有了rotate,这下方便了。
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Document document = new Document(PageSize.A4.rotate());
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还有Page color和Page Margins,
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Rectangle rect = PageSize.A4;rect.setBackgroundColor(Color.BLUE);Document document = new Document(rect);?
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Document document = new Document(PageSize.A4, 36,70, 120, 100);?
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?测试代码?
import java.awt.Color;import java.io.FileOutputStream;import java.io.IOException;import com.lowagie.text.Document;import com.lowagie.text.DocumentException;import com.lowagie.text.PageSize;import com.lowagie.text.Paragraph;import com.lowagie.text.Rectangle;import com.lowagie.text.pdf.PdfWriter;import junit.framework.TestCase;/** * @blog http://reymont.iteye.com/ * @MSN reymont.li@hotmail.com * @author reymont.li * @version create time:2011-7-29 上午10:01:44 */public class DocumentStudy extends TestCase{public void testNewDocumentMargin(){Document document = new Document(PageSize.A4, 36,70, 120, 100);try {PdfWriter.getInstance(document,new FileOutputStream("resource/NewDocumentMargin.pdf"));document.open();document.add(new Paragraph("Hello World"));} catch (DocumentException de) {System.err.println(de.getMessage());} catch (IOException ioe) {System.err.println(ioe.getMessage());}document.close();}public void testNewDocumentColor(){Rectangle rect = PageSize.A4;rect.setBackgroundColor(Color.BLUE);Document document = new Document(rect);try {PdfWriter.getInstance(document,new FileOutputStream("resource/NewDocumentColor.pdf"));document.open();document.add(new Paragraph("Hello World"));} catch (DocumentException de) {System.err.println(de.getMessage());} catch (IOException ioe) {System.err.println(ioe.getMessage());}document.close();}public void testNewDocumentRotate(){Document document = new Document(PageSize.A4.rotate());try {PdfWriter.getInstance(document,new FileOutputStream("resource/NewDocumentRotate.pdf"));document.open();document.add(new Paragraph("Hello World"));} catch (DocumentException de) {System.err.println(de.getMessage());} catch (IOException ioe) {System.err.println(ioe.getMessage());}document.close();}public void testNewDocument2(){Rectangle rect = new Rectangle(500,500,800,600);Document document = new Document(rect);try {PdfWriter.getInstance(document,new FileOutputStream("resource/NewDocument2.pdf"));document.open();document.add(new Paragraph("Hello World"));} catch (DocumentException de) {System.err.println(de.getMessage());} catch (IOException ioe) {System.err.println(ioe.getMessage());}document.close();}public void testNewDocument1(){Rectangle rect = new Rectangle(0,0,800,600);Document document = new Document(rect);try {PdfWriter.getInstance(document,new FileOutputStream("resource/NewDocument1.pdf"));document.open();document.add(new Paragraph("Hello World"));} catch (DocumentException de) {System.err.println(de.getMessage());} catch (IOException ioe) {System.err.println(ioe.getMessage());}document.close();}public void testNewDocument(){Rectangle rect = new Rectangle(800,600);Document document = new Document(rect);try {PdfWriter.getInstance(document,new FileOutputStream("resource/NewDocument1.pdf"));document.open();document.add(new Paragraph("Hello World"));} catch (DocumentException de) {System.err.println(de.getMessage());} catch (IOException ioe) {System.err.println(ioe.getMessage());}document.close();}}
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参考IText.Manning.iText.in.Action.Dec.2006.pdf
itext-2.0.8.jar
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