利用iText写PDF心得

最新推荐文章于 2024-10-14 13:45:16 发布

原创最新推荐文章于 2024-10-14 13:45:16 发布 · 1k 阅读

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文章标签：

#null #alignment #table #header #ibm #string

本文介绍如何使用iText库创建包含中文内容及特定格式的PDF文件，包括自定义字体、段落及表格等组件。

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最近由于项目需要，开始使用iText写PDF文件，从网上搜索到一些信息，但都是零碎的一些，现在稍微整理一下，仅限于写pdf文件部分。首先创建一个pdfWriter的模板

/*
* Created on 2005-7-1
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package javax.print.PDF;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import com.lowagie.text.Cell;
import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Rectangle;
import com.lowagie.text.Table;
import com.lowagie.text.pdf.PdfWriter;
/**
* @author jcoder
*
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
*/
abstract public class PDFWriter {
protected Document document = null;
protected FileOutputStream out = null;
protected Rectangle pageSize = null;
protected String filePath = null;
protected Cell cell = null;
protected Paragraph header = null;
protected Paragraph prg = null;
protected Table table = null;
public PDFWriter(String filePath) {
try {
this.filePath = filePath;
document = new Document();
out = new FileOutputStream(filePath);
PdfWriter.getInstance(document, out);
document.open();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void close() {
try {
document.close();
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

由于我需要在pdf中创建表格，要使用到com.lowagie.text.Cell，com.lowagie.text.Paragraph， com.lowagie.text.Table，com.lowagie.text.Cell， com.lowagie.text.Chunk，com.lowagie.text.Font等类，cell为表格中的每个单元格的内容，paragraph为段落内容，cell的构造函数有很多，这里不一一列举了，因为我要用到中文字符，所以特别使用了cell(Element e)这个构造函数，Element为一个接口，实现此接口的类有很多，包含chunk,meta等，表明cell里可以添加很多不同的内容，可以实现自己的定制，chunk的构造函数为Chunk(String content,Font f)，在这里我定制了自己的cell，代码如下：

/*
* Created on 2005-7-1
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package javax.print.PDF;
import com.lowagie.text.BadElementException;
import com.lowagie.text.Cell;
import com.lowagie.text.Chunk;
import com.lowagie.text.Font;
/**
* @author jcoder
*
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
*/
public class PDFCell extends Cell {
public PDFCell(String content, int rowspan, int colspan)
throws BadElementException {
super(new Chunk(content, PDFChineseFont
.createChineseFont(10, Font.NORMAL)));
setRowspan(rowspan);
setColspan(colspan);
setHeader(false);
}
}

稍许解释一下，rowspan和colspan为Cell的两个属性，写过网页的朋友都知道，表格中的行和列有的时候有必要进行合并，这里就实现了这个功能。 Paragraph类我也进行了封装：

/*
* Created on 2005-7-5
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package javax.print.PDF;
import com.lowagie.text.Element;
import com.lowagie.text.Font;
import com.lowagie.text.Paragraph;
/**
* @author Administrator
*
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
*/
public class PDFParagragh extends Paragraph {
public PDFParagragh(String content, int alignment, int fontSize) {
super(content, PDFChineseFont.createChineseFont(fontSize, Font.NORMAL));
setAlignment(alignment);
}
public static final int CENTER = Element.ALIGN_CENTER;
public static final int LEFT = Element.ALIGN_LEFT;
public static final int RIGHT = Element.ALIGN_RIGHT;
public static final int TOP = Element.ALIGN_TOP;
public static final int MIDDLE = Element.ALIGN_MIDDLE;
public static final int BOTTOM = Element.ALIGN_BOTTOM;
}

从以上两个代码段中可以看到PDFChineseFont.createChineseFont(int fontSize,int fontStyle)函数这个也进行了封装，为自定义函数：

/*
* Created on 2005-7-1
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package javax.print.PDF;
import java.io.IOException;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Font;
import com.lowagie.text.pdf.BaseFont;
/**
* @author jcoder
*
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
*/
public class PDFChineseFont {
private static Font chineseFont;
public final static Font createChineseFont(int size, int style) {
try {
chineseFont = new Font(BaseFont.createFont("STSong-Light",
"UniGB-UCS2-H", BaseFont.NOT_EMBEDDED), size, style);
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return chineseFont;
}
}

如果无此函数定义，生成的pdf文件中的中文字符将不显示。最后实现自己定制好的pdf文档格式

/*
* Created on 2005-7-1
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package javax.print.PDF;
import com.lowagie.text.BadElementException;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Table;
/**
* @author jcoder
*
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
*/
public class MyWriter extends PDFWriter {
public MyWriter(String path) {
super(path);
try {
header = new PDFParagraph("仪器设备调拨单");
document.add(header);
table = new Table(14);
table.setBorderWidth(0);
table.addCell(new PDFCell("（单价：500元以上含500元）", 1, 5));
table.addCell(new PDFCell("2005年7月1号", 1, 9));
document.add(table);
table = new Table(14);
table.setBorderWidth(1);
table.addCell(new PDFCell("设备编号", 1, 2));
table.addCell(new PDFCell("设备名称", 1, 3));
table.addCell(new PDFCell("型号规格", 1, 2));
table.addCell(new PDFCell("数量", 1, 1));
table.addCell(new PDFCell("单价", 1, 1));
table.addCell(new PDFCell("总价", 1, 1));
table.addCell(new PDFCell("附件", 1, 2));
table.addCell(new PDFCell("备注", 1, 2));
table.endHeaders();//换行
table.addCell(new PDFCell("0126242245", 1, 2));
table.addCell(new PDFCell("IBM大型机", 1, 3));
table.addCell(new PDFCell("5465-445GH", 1, 2));
table.addCell(new PDFCell("3", 1, 1));
table.addCell(new PDFCell("299,000", 1, 1));
table.addCell(new PDFCell("2,230,200", 1, 1));
table.addCell(new PDFCell("无", 1, 2));
table.addCell(new PDFCell("软件学院买入", 1, 2));
table.endHeaders();
table.addCell(new PDFCell("调出单位意见：", 1, 11));
table.addCell(new PDFCell("院（系）签章", 1, 3));
table.endHeaders();
table.addCell(new PDFCell("申请调入单位意见：", 1, 11));
table.addCell(new PDFCell("院（系）签章", 1, 3));
table.endHeaders();
table.addCell(new PDFCell("设备管理科审批：", 1, 5));
table.addCell(new PDFCell("实验室与设备管理处审批", 1, 4));
table.addCell(new PDFCell("校部审批：", 1, 5));
table.endHeaders();
document.add(table);
close();//别忘记关闭
} catch (BadElementException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

测试类：

/*
* Created on 2005-7-1
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/
package javax.print.PDF;
/**
* @author jcoder
*
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
*/
public class Test {
public static void main(String[] args) {
PDFWriter pdf = new MyWriter("mine.pdf");
}
}

写iText需要iText包下载地址为 http://prdownloads.sourceforge.net/itext/itext-1.3.jar 如果要加入中文，请再下载一个包，地址为： http://itext.sourceforge.net/downloads/iTextAsian.jar 写的比较浅，希望对大家会有帮助