使用JAVA生成PDF的时候，还是有些注意事项需要处理的。
第一、中文问题，默认的itext是不支持中文的，想要支持，需要做些处理。
1、直接引用操作系统的中文字体库支持，由于此方案限制性强，又绑定了操作系统，所以此处不做实现，有兴趣可在网上搜索看看。
2、引用itext-asian.jar包的字体支持，代码稍后上。
第二、表格中的设置，特别是上中下，左中右，不同的对象有不同的枚举实现，刚入手很容易混淆。其外是前景色，背景色，表格颜色等等。
第三、输出图片，很容易报错。、
package com.itext.test;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import com.itextpdf.text.BadElementException;
import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.BarcodeQRCode;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfGState;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfPageEventHelper;
import com.itextpdf.text.pdf.PdfWriter;
public class T {
private static String path = "docs/"; // 生成PDF后的存放路径
public static void main(String[] args) {
T t = new T();
t.initPDF(initData());
}
/**
* 初始化PDF
*
* @param apis
*/
public void initPDF(List<Api> apis) {
File folder = new File(path);
if (!folder.exists())
folder.mkdirs(); // 创建目录
Document doc = null;
try {
// 中文字体，要有itext-asian.jar支持(默认的itext.jar是不支持中文的)
BaseFont bfchinese = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
Rectangle pageSize = new Rectangle(PageSize.A4); // 页面大小设置为A4
doc = new Document(pageSize, 20, 20, 40, 40); // 创建doc对象并设置边距
PdfWriter writer = PdfWriter.getInstance(doc, new FileOutputStream(folder.getAbsolutePath() + File.separator + "API文档.pdf"));
writer.setPageEvent(new SdkPdfPageEvent());
doc.open();
doc.addAuthor("Ares-xby");
doc.addSubject("SDK附属API文档");
doc.addTitle("API文档");
BaseColor borderColor = new BaseColor(90, 140, 200);
BaseColor bgColor = new BaseColor(80, 130, 180);
for (Api api : apis) {
PdfPTable table = new PdfPTable(4);
// table.setWidthPercentage(100); // 设置table宽度为100%
// table.setHorizontalAlignment(PdfPTable.ALIGN_CENTER); // 设置table居中显示
for (int i = 0; i < api.getParams().size(); i++) {
if (i == 0) {
// row 1
table.addCell(createCell("API", bfchinese, borderColor, bgColor));
table.addCell(createCell(api.getApiName(), 12, bfchinese, 3, null, borderColor, bgColor));
// row 2
table.addCell(createCell("描述", bfchinese, borderColor));
table.addCell(createCell(api.getApiDesc(), 12, bfchinese, 3, null, borderColor));
} else {
table.addCell(createCell(api.getParams().get(i).getParamName(), 10, bfchinese, null, Paragraph.ALIGN_RIGHT, borderColor));
table.addCell(createCell(api.getParams().get(i).getParamName(), 10, bfchinese, null, null, borderColor));
table.addCell(createCell(api.getParams().get(i).getParamType(), 10, bfchinese, null, null, borderColor));
table.addCell(createCell(api.getParams().get(i).getParamDesc(), 10, bfchinese, null, null, borderColor));
}
}
doc.add(table);
}
// 二维码
BarcodeQRCode qrcode = new BarcodeQRCode("http://www.baidu.com", 1, 1, null);
Image qrcodeImage = qrcode.getImage();
qrcodeImage.setAbsolutePosition(10, 600);
qrcodeImage.scalePercent(200);
doc.add(qrcodeImage);
doc.close();
System.out.println("init pdf over.");
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (doc != null)
doc.close();
}
}
public static List<Api> initData() {
List<Api> list = new ArrayList<Api>();
for (int i = 0; i < 100; i++) {
Api api = new Api();
api.setApiName("api-" + i);
api.setApiDesc("描述-" + i);
int paramSize = new Random().nextInt(20);
List<Params> paramList = new ArrayList<Params>();
for (int j = 0; j < paramSize; j++) {
Params param = new Params();
param.setParamName("param-" + i + "-" + j);
param.setParamType("paramType-" + i + "-" + j);
param.setParamDesc("描述-" + i + "-" + j);
paramList.add(param);
}
api.setParams(paramList);
list.add(api);
}
System.out.println("init data over. size=" + list.size());
return list;
}
// 用於生成cell
private static PdfPCell createCell(String text, BaseFont font, BaseColor borderColor) {
return createCell(text, 12, font, null, null, borderColor, null);
}
// 用於生成cell
private static PdfPCell createCell(String text, BaseFont font, BaseColor borderColor, BaseColor bgColor) {
return createCell(text, 12, font, null, null, borderColor, bgColor);
}
// 用於生成cell
private static PdfPCell createCell(String text, int fontsize, BaseFont font, Integer colspan, Integer align, BaseColor borderColor) {
return createCell(text, fontsize, font, colspan, align, borderColor, null);
}
/**
* 用於生成cell
*
* @param text
* Cell文字内容
* @param fontsize
* 字体大小
* @param font
* 字体
* @param colspan
* 合并列数量
* @param align
* 显示位置(左中右，Paragraph对象)
* @param borderColor
* Cell边框颜色
* @param bgColor
* Cell背景色
* @return
*/
private static PdfPCell createCell(String text, int fontsize, BaseFont font, Integer colspan, Integer align, BaseColor borderColor, BaseColor bgColor) {
Paragraph pagragraph = new Paragraph(text, new Font(font, fontsize));
PdfPCell cell = new PdfPCell(pagragraph);
cell.setFixedHeight(20);
cell.setVerticalAlignment(Element.ALIGN_MIDDLE); // 上中下，Element对象
if (align != null)
cell.setHorizontalAlignment(align);
if (colspan != null && colspan > 1)
cell.setColspan(colspan);
if (borderColor != null)
cell.setBorderColor(borderColor);
if (bgColor != null)
cell.setBackgroundColor(bgColor);
return cell;
}
/**
* SDK中PDF相关的PageEvent
*/
class SdkPdfPageEvent extends PdfPageEventHelper {
@Override
public void onStartPage(PdfWriter writer, Document document) {
// 水印(water mark)
PdfContentByte pcb = writer.getDirectContent();
pcb.saveState();
BaseFont bf;
try {
bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED);
pcb.setFontAndSize(bf, 36);
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
PdfGState gs = new PdfGState();
gs.setFillOpacity(0.2f);
pcb.setGState(gs);
pcb.beginText();
pcb.setTextMatrix(60, 90);
pcb.showTextAligned(Element.ALIGN_LEFT, "XX公司有限公司", 200, 300, 45);
pcb.endText();
pcb.restoreState();
}
@Override
public void onEndPage(PdfWriter writer, Document document) {
// 页眉、页脚
PdfContentByte pcb = writer.getDirectContent();
try {
pcb.setFontAndSize(BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED), 10);
} catch (Exception e) {
e.printStackTrace();
} // 支持中文字体
pcb.saveState();
try {
// pcb.addImage()方法要在pcb.beginText();pcb.endText();之外调用，
// 否则生成的PDF打开时会报错: An error exists on this page. Acrobat may not display the page correctly. Please contact the person who created the PDF document to correct the problem.
// byte[] b = new byte[10 * 1024];
// int i = getClass().getResourceAsStream("logo.png").read(b);
Image image = Image.getInstance("logo.png");
image.setAbsolutePosition(document.left(), document.top(-5)); // 设置图片显示位置
image.scalePercent(12); // 按照百分比缩放
pcb.addImage(image);
} catch (BadElementException e) {
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (DocumentException e) {
e.printStackTrace();
}
pcb.beginText();
// Header
float top = document.top(-15);
pcb.showTextAligned(PdfContentByte.ALIGN_RIGHT, "XX开放平台API文档", document.right(), top, 0);
// Footer
float bottom = document.bottom(-15);
pcb.showTextAligned(PdfContentByte.ALIGN_CENTER, "第 " + writer.getPageNumber() + " 页", (document.right() + document.left()) / 2, bottom, 0);
pcb.endText();
pcb.restoreState();
pcb.closePath();
}
@Override
public void onCloseDocument(PdfWriter writer, Document document) {
PdfContentByte pcb = writer.getDirectContent();
try {
pcb.beginText();
pcb.setFontAndSize(BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.EMBEDDED), 10); // 支持中文字体
pcb.showText(writer.getPageNumber() - 1 + "页");
pcb.endText();
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
pcb.closePath();
}
}
/**
* POJO
*/
static class Api {
private String apiName;
private String apiDesc;
private List<Params> params;
public String getApiName() {
return apiName;
}
public void setApiName(String apiName) {
this.apiName = apiName;
}
public String getApiDesc() {
return apiDesc;
}
public void setApiDesc(String apiDesc) {
this.apiDesc = apiDesc;
}
public List<Params> getParams() {
return params;
}
public void setParams(List<Params> params) {
this.params = params;
}
}
/**
* POJO
*/
static class Params {
private String paramName;
private String paramType;
private String paramDesc;
public String getParamName() {
return paramName;
}
public void setParamName(String paramName) {
this.paramName = paramName;
}
public String getParamType() {
return paramType;
}
public void setParamType(String paramType) {
this.paramType = paramType;
}
public String getParamDesc() {
return paramDesc;
}
public void setParamDesc(String paramDesc) {
this.paramDesc = paramDesc;
}
}
}
时间： 2024-10-11 17:51:16