【Itext】7步制作Itext5页眉页脚pdf实现第几页共几页

liuguichuan 2014-03-20

展开全文

[java] view plain copy

/**
* Project Name:report
* File Name:PdfReportM1HeaderFooter.java
* Package Name:com.riambsoft.report.pdf
* Date:2013-9-16上午08:59:00
* Copyright (c) 2013, riambsoft All Rights Reserved.
*
*/
package com.riambsoft.report.pdf;
import java.io.IOException;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.ColumnText;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfPageEventHelper;
import com.itextpdf.text.pdf.PdfTemplate;
import com.itextpdf.text.pdf.PdfWriter;
/**
* ClassName:PdfReportM1HeaderFooter Function: TODO ADD FUNCTION. Reason: TODO ADD REASON. Date: 2013-9-13 上午08:59:00
*
* @author 落雨
* @version 394263788(QQ)
* @since JDK 1.5
* @see http://hi.baidu.com/ae6623
*/
public class PdfReportM1HeaderFooter extends PdfPageEventHelper {
/**
* 页眉
*/
public String header = "";
/**
* 文档字体大小，页脚页眉最好和文本大小一致
*/
public int presentFontSize = 12;
/**
* 文档页面大小，最好前面传入，否则默认为A4纸张
*/
public Rectangle pageSize = PageSize.A4;
// 模板
public PdfTemplate total;
// 基础字体对象
public BaseFont bf = null;
// 利用基础字体生成的字体对象，一般用于生成中文文字
public Font fontDetail = null;
/**
*
* Creates a new instance of PdfReportM1HeaderFooter 无参构造方法.
*
*/
public PdfReportM1HeaderFooter() {
}
/**
*
* Creates a new instance of PdfReportM1HeaderFooter 构造方法.
*
* @param yeMei
* 页眉字符串
* @param presentFontSize
* 数据体字体大小
* @param pageSize
* 页面文档大小，A4，A5，A6横转翻转等Rectangle对象
*/
public PdfReportM1HeaderFooter(String yeMei, int presentFontSize, Rectangle pageSize) {
this.header = yeMei;
this.presentFontSize = presentFontSize;
this.pageSize = pageSize;
}
public void setHeader(String header) {
this.header = header;
}
public void setPresentFontSize(int presentFontSize) {
this.presentFontSize = presentFontSize;
}
/**
*
* TODO 文档打开时创建模板
*
* @see com.itextpdf.text.pdf.PdfPageEventHelper#onOpenDocument(com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
*/
public void onOpenDocument(PdfWriter writer, Document document) {
total = writer.getDirectContent().createTemplate(50, 50);// 共页的矩形的长宽高
}
/**
*
* TODO 关闭每页的时候，写入页眉，写入'第几页共'这几个字。
*
* @see com.itextpdf.text.pdf.PdfPageEventHelper#onEndPage(com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
*/
public void onEndPage(PdfWriter writer, Document document) {
try {
if (bf == null) {
bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", false);
}
if (fontDetail == null) {
fontDetail = new Font(bf, presentFontSize, Font.NORMAL);// 数据体字体
}
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// 1.写入页眉
ColumnText.showTextAligned(writer.getDirectContent(), Element.ALIGN_LEFT, new Phrase(header, fontDetail), document.left(), document.top() + 20, 0);
// 2.写入前半部分的第 X页/共
int pageS = writer.getPageNumber();
String foot1 = "第 " + pageS + " 页 /共";
Phrase footer = new Phrase(foot1, fontDetail);
// 3.计算前半部分的foot1的长度，后面好定位最后一部分的'Y页'这俩字的x轴坐标，字体长度也要计算进去 = len
float len = bf.getWidthPoint(foot1, presentFontSize);
// 4.拿到当前的PdfContentByte
PdfContentByte cb = writer.getDirectContent();
// 5.写入页脚1，x轴就是(右margin+左margin + right() -left()- len)/2.0F 再给偏移20F适合人类视觉感受，否则肉眼看上去就太偏左了 ,y轴就是底边界-20,否则就贴边重叠到数据体里了就不是页脚了；注意Y轴是从下往上累加的，最上方的Top值是大于Bottom好几百开外的。
ColumnText.showTextAligned(cb, Element.ALIGN_CENTER, footer, (document.rightMargin() + document.right() + document.leftMargin() - document.left() - len) / 2.0F + 20F, document.bottom() - 20, 0);
// 6.写入页脚2的模板（就是页脚的Y页这俩字）添加到文档中，计算模板的和Y轴,X=(右边界-左边界 - 前半部分的len值)/2.0F + len ， y 轴和之前的保持一致，底边界-20
cb.addTemplate(total, (document.rightMargin() + document.right() + document.leftMargin() - document.left()) / 2.0F + 20F, document.bottom() - 20); // 调节模版显示的位置
}
/**
*
* TODO 关闭文档时，替换模板，完成整个页眉页脚组件
*
* @see com.itextpdf.text.pdf.PdfPageEventHelper#onCloseDocument(com.itextpdf.text.pdf.PdfWriter, com.itextpdf.text.Document)
*/
public void onCloseDocument(PdfWriter writer, Document document) {
// 7.最后一步了，就是关闭文档的时候，将模板替换成实际的 Y 值,至此，page x of y 制作完毕，完美兼容各种文档size。
total.beginText();
total.setFontAndSize(bf, presentFontSize);// 生成的模版的字体、颜色
String foot2 = " " + (writer.getPageNumber() - 1) + " 页";
total.showText(foot2);// 模版显示的内容
total.endText();
total.closePath();
}
}

如何调用？

这样调用即可，下面的代码就是第几页/共几页的实现方式！推荐大家使用，直接扔到自己的工程，在创建pdf的时候，直接把此event set进去即可。

[java] view plain copy

/**
* Project Name:report
* File Name:PDFBuilder.java
* Package Name:com.riambsoft.report.itext
* Date:2013-9-13下午03:35:53
* Copyright (c) 2013, riambsoft All Rights Reserved.
*
*/
package com.riambsoft.report.itext;
import java.io.FileOutputStream;
import java.io.IOException;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.ColumnText;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfWriter;
import com.riambsoft.report.pdf.PdfReportM1HeaderFooter;
/**
* ClassName:PDFBuilder
* Function: TODO ADD FUNCTION.
* Reason: TODO ADD REASON.
* Date: 2013-9-13 下午03:35:53
* @author Administrator
* @version
* @since JDK 1.5
* @see
*/
public class PDFBuilder {
private int pageHeight;
private int pageWidth;
private PDFBuilder(){
}
public static PDFBuilder getInstance(){
return new PDFBuilder();
}
public void generatePDF()throws Exception {
Document document = new Document(new Rectangle(pageWidth, pageHeight));
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(""));
this.setFooter(writer);
writer.setFullCompression();
writer.setPdfVersion(PdfWriter.VERSION_1_4);
document.open();
// Set pdf version to 1.4
PdfContentByte cb = writer.getDirectContent();
ColumnText ct=new ColumnText(cb);
for(int i=0;i<10;i++){
document.newPage();
//如果不设置空白页无法单独显示
writer.setPageEmpty(false);
}
document.close();
}
private void setFooter(PdfWriter writer) throws DocumentException, IOException {
//HeaderFooter headerFooter = new HeaderFooter(this);
//更改事件，瞬间变身第几页/共几页模式。
PdfReportM1HeaderFooter headerFooter = new PdfReportM1HeaderFooter();//就是上面那个类
writer.setBoxSize("art",PageSize.A4);
writer.setPageEvent(headerFooter);
}
public int getPageHeight() {
return pageHeight;
}
public void setPageHeight(int pageHeight) {
this.pageHeight = pageHeight;
}
public int getPageWidth() {
return pageWidth;
}
public void setPageWidth(int pageWidth) {
this.pageWidth = pageWidth;
}
public static void main(String[] args) throws Exception {
PDFBuilder builder=new PDFBuilder();
builder.setPageHeight(400);
builder.setPageWidth(600);
builder.generatePDF();
}
}

核心算法：就是计算文档的长宽，算出中点，记得中文字体是需要占用宽度的，所以也要计算进去，其次没什么重点，研究一下中点的计算吧，初中知识。

paga x 这种好做，page x of y 按照官方 itext in action 2这本书上面说的那种办法，无法准确计算各种文档的x轴和y轴坐标。

我按照书上所写的实现方式如下，不推荐使用，因为只适合于A4纸张。

PdfReportM1HeaderFooter2.java

[java] view plain copy

/**
* Project Name:report
* File Name:PdfReportM1HeaderFooter.java
* Package Name:com.riambsoft.report.pdf
* Date:2013-9-13上午08:59:00
* Copyright (c) 2013, riambsoft All Rights Reserved.
*
*/
package com.riambsoft.report.pdf;
import java.io.IOException;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.ExceptionConverter;
import com.itextpdf.text.Font;
import com.itextpdf.text.Image;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.ColumnText;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfPageEventHelper;
import com.itextpdf.text.pdf.PdfTemplate;
import com.itextpdf.text.pdf.PdfWriter;
/**
* ClassName:PdfReportM1HeaderFooter2 Function: TODO ADD FUNCTION. Reason: TODO ADD REASON. Date: 2013-9-13 上午08:59:00
*
* @author Administrator
* @version
* @since JDK 1.5
* @see
*/
public class PdfReportM1HeaderFooter2 extends PdfPageEventHelper {
String header;
int presentFontSize = 12;
PdfTemplate total;
BaseFont bf = null;
Font fontDetail = null;
public void setHeader(String header) {
this.header = header;
}
public void onOpenDocument(PdfWriter writer, Document document) {
total = writer.getDirectContent().createTemplate(30, 16);
}
public void onEndPage(PdfWriter writer, Document document) {
Rectangle pageSize = writer.getBoxSize("art");
try {
if (bf == null) {
bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", false);
}
if (fontDetail == null) {
fontDetail = new Font(bf, presentFontSize, Font.NORMAL);// 数据体字体
}
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
int pageN = writer.getPageNumber();
String text = "第 " + pageN + "页/共 ";
// 页眉
ColumnText.showTextAligned(writer.getDirectContent(), Element.ALIGN_LEFT, new Phrase("我是页眉，土豪我们做朋友吧",fontDetail), document.left(), document.top() + 20, 0);
PdfPTable table = new PdfPTable(2);
try {
table.setWidths(new int[] { 1, 1 });
table.setWidthPercentage(100F);// 占据百分百宽度
table.setTotalWidth(pageSize.getRight() - pageSize.getLeft() - 100);
PdfPCell cell1 = new PdfPCell(new Phrase(text, fontDetail));
PdfPCell cell2 = new PdfPCell(Image.getInstance(total));
cell1.setHorizontalAlignment(Element.ALIGN_RIGHT);
cell1.setBorder(Rectangle.NO_BORDER);
cell2.setHorizontalAlignment(Element.ALIGN_LEFT);
cell2.setBorder(Rectangle.NO_BORDER);
table.addCell(cell1);
table.addCell(cell2);
table.writeSelectedRows(0, -1, document.left(), document.bottom(), writer.getDirectContent());
} catch (DocumentException de) {
throw new ExceptionConverter(de);
}
}
public void onCloseDocument(PdfWriter writer, Document document) {
try {
if (bf == null) {
bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", false);
}
if (fontDetail == null) {
fontDetail = new Font(bf, presentFontSize, Font.NORMAL);// 数据体字体
}
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
ColumnText.showTextAligned(total, Element.ALIGN_LEFT, new Phrase(String.format("%d页", writer.getPageNumber() - 1), fontDetail), 2, 2, 0);
}
}