Java IText实现HTML转换PDF
1、IText实现html2pdf，速度快，纠错能力差，支持中文（要求HTML使用unicode编码），但中支持一种中文字体，开源。
2、Flying Sauser实现html2pdf，纠错能力差，支持多种中文字体（部分样式不能识别），开源。
下面是IText示例
官网：http://www.itextpdf.com/
测试案例：TestIText.java
依赖jar包：iText-2.0.8.jar、iTextAsian.jar（支持中文）
下面只是一个小的测试案例，如果项目中使用到了该组件可以参考API完成项目组中相应的功能！
import java.io.FileOutputStream;
import java.io.FileReader;
import java.util.ArrayList;
import com.lowagie.text.Document;
import com.lowagie.text.Element;
import com.lowagie.text.Font;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.html.simpleparser.HTMLWorker;
import com.lowagie.text.html.simpleparser.StyleSheet;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfWriter;
public class TestIText{
public static void main(String[] args) {
TestIText ih = new TestIText();
ih.htmlCodeComeFromFile("D:\\Test\\iText.html", "D:\\Test\\iText_1.pdf");
ih.htmlCodeComeString("Hello中文", "D:\\Test\\iText_2.pdf");
}
public void htmlCodeComeFromFile(String filePath, String pdfPath) {
Document document = new Document();
try {
StyleSheet st = new StyleSheet();
st.loadTagStyle("body", "leading", "16,0");
PdfWriter.getInstance(document, new FileOutputStream(pdfPath));
document.open();
ArrayList p = HTMLWorker.parseToList(new FileReader(filePath), st);
for(int k = 0; k < p.size(); ++k) {
document.add((Element)p.get(k));
}
document.close();
System.out.println("文档创建成功");
}catch(Exception e) {
e.printStackTrace();
}
}
public void htmlCodeComeString(String htmlCode, String pdfPath) {
Document doc = new Document(PageSize.A4);
try {
PdfWriter.getInstance(doc, new FileOutputStream(pdfPath));
doc.open();
// 解决中文问题
BaseFont bfChinese = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED);
Font FontChinese = new Font(bfChinese, 12, Font.NORMAL);
Paragraph t = new Paragraph(htmlCode, FontChinese);
doc.add(t);
doc.close();
System.out.println("文档创建成功");
}catch(Exception e) {
e.printStackTrace();
}
}
}
详细实现直接粘代码留作参考
package org.leno.export.util;
import java.io.UnsupportedEncodingException;
public class StrHelp {
public static String getChinese(String s) {
try {
return new String(s.getBytes("gb2312"), "iso-8859-1");
} catch (UnsupportedEncodingException e) {
return s;
}
}
}
package org.leno.export.util;
import java.io.IOException;
import com.lowagie.text.*;
import com.lowagie.text.pdf.BaseFont;
public class PdfParagraph extends Paragraph {
private static final long serialVersionUID = -244970043180837974L;
public PdfParagraph(String content) {
super(content, getChineseFont(12, false));
}
public PdfParagraph(String content, int fontSize, boolean isBold) {
super(content, getChineseFont(fontSize, isBold));
}
// 设置字体-返回中文字体
protected static Font getChineseFont(int nfontsize, boolean isBold) {
BaseFont bfChinese;
Font fontChinese = null;
try {
bfChinese = BaseFont.createFont("c://windows//fonts//simsun.ttc,1",
BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
if (isBold) {
fontChinese = new Font(bfChinese, nfontsize, Font.BOLD);
} else {
fontChinese = new Font(bfChinese, nfontsize, Font.NORMAL);
}
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return fontChinese;
}
// 转化中文
protected Cell ChangeCell(String str, int nfontsize, boolean isBold)
throws IOException, BadElementException, DocumentException {
Phrase ph = ChangeChinese(str, nfontsize, isBold);
Cell cell = new Cell(ph);
// cell.setBorderWidth(3);
return cell;
}
// 转化中文
protected Chunk ChangeChunk(String str, int nfontsize, boolean isBold)
throws IOException, BadElementException, DocumentException {
Font FontChinese = getChineseFont(nfontsize, isBold);
Chunk chunk = new Chunk(str, FontChinese);
return chunk;
}
// 转化中文
protected Phrase ChangeChinese(String str, int nfontsize, boolean isBold)
throws IOException, BadElementException, DocumentException {
Font FontChinese = getChineseFont(nfontsize, isBold);
Phrase ph = new Phrase(str, FontChinese);
return ph;
}
}
以上是两个帮助封装类，都是为了对付iText的中文问题的。下面就是主角出场：
package org.leno.export.util;
import java.io.*;
import java.lang.reflect.*;
import java.util.*;
import com.lowagie.text.*;
import com.lowagie.text.pdf.*;
import java.awt.Color;
import javax.swing.JOptionPane;
import java.net.MalformedURLException;
import java.text.SimpleDateFormat;
/**
* 利用开源组件IText2.0.7动态导出PDF文档 转载时请保留以下信息，注明出处！
*
* @author leno
* @version v1.0
* @param <T>
* 应用泛型，代表任意一个符合javabean风格的类
* 注意这里为了简单起见，boolean型的属性xxx的get器方式为getXxx(),而不是isXxx()
* byte[]表图片数据,注意合适的大小
*/
public class ExportPdf<T> {
public void exportPdf(Collection<T> dataset, OutputStream out) {
exportPdf("测试iText导出PDF文档", null, dataset, out, "yyyy-MM-dd");
}
public void exportPdf(String[] headers, Collection<T> dataset,
OutputStream out) {
exportPdf("测试iText导出PDF文档", headers, dataset, out, "yyyy-MM-dd");
}
public void exportPdf(String[] headers, Collection<T> dataset,
OutputStream out, String pattern) {
exportPdf("测试iText导出PDF文档", headers, dataset, out, pattern);
}
/**
* 这是一个通用的方法，利用了JAVA的反射机制，可以将放置在JAVA集合中并且符号一定条件的数据以PDF 的形式输出到指定IO设备上
*
* @param title
* 表格标题名
* @param headers
* 表格属性列名数组
* @param dataset
* 需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的
* javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据)
* @param out
* 与输出设备关联的流对象，可以将PDF文档导出到本地文件或者网络中
* @param pattern
* 如果有时间数据，设定输出格式。默认为"yyy-MM-dd"
*/
@SuppressWarnings("unchecked")
public void exportPdf(String title, String[] headers,
Collection<T> dataset, OutputStream out, String pattern) {
// 作为报表的PDF文件，一定要适合打印机的输出打印
Rectangle rectPageSize = new Rectangle(PageSize.A4);// 定义A4页面大小
// rectPageSize = rectPageSize.rotate();// 加上这句可以实现A4页面的横置
Document document = new Document(rectPageSize, 50, 50, 50, 50);// 其余4个参数，设置了页面的4个边距
try {
// 将PDF文档写出到out所关联IO设备上的书写对象
PdfWriter.getInstance(document, out);
// 添加文档元数据信息
document.addTitle(StrHelp.getChinese(title));
document.addSubject("export information");
document.addAuthor("leno");
document.addCreator("leno");
document.addKeywords("pdf itext");
// 定义页头和页尾
HeaderFooter header = new HeaderFooter(new PdfParagraph(title, 20,
true), false);
header.setAlignment(Element.ALIGN_CENTER);
HeaderFooter footer = new HeaderFooter(new Phrase(
"This is page "), new Phrase("."));
footer.setAlignment(Element.ALIGN_CENTER);
document.setHeader(header);
document.setFooter(footer);
// 打开PDF文档
document.open();
// 添加一张表格，使用Table或者PdfPTable
// Table table = new Table(headers.length);
// table.setWidth(16*headers.length);
// //table.setWidths(new float[]{20,20,20,30});
// table.setCellsFitPage(true);
// table.setAutoFillEmptyCells(true);
// table.setAlignment(Table.ALIGN_CENTER);
// table.setBackgroundColor(Color.yellow);
// table.setBorderColor(Color.green);
PdfPTable table = new PdfPTable(headers.length);
// table.setHorizontalAlignment(Element.ALIGN_CENTER);
table.setWidthPercentage(16 * headers.length);
// 产生表格标题行
for (int i = 0; i < headers.length; i++) {
PdfPCell cell = new PdfPCell(new PdfParagraph(headers[i], 14,
true));
cell.setHorizontalAlignment(Cell.ALIGN_CENTER);
cell.setVerticalAlignment(Cell.ALIGN_MIDDLE);
cell.setBackgroundColor(Color.cyan);
cell.setBorderColor(Color.green);
table.addCell(cell);
}
// 遍历集合数据，产生数据行
Iterator<T> it = dataset.iterator();
int index = 0;
while (it.hasNext()) {
index++;
T t = (T) it.next();
// 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值
Field[] fields = t.getClass().getDeclaredFields();
for (short i = 0; i < fields.length; i++) {
PdfPCell cell = null;
Field field = fields[i];
String fieldName = field.getName();
String getMethodName = "get"
+ fieldName.substring(0, 1).toUpperCase()
+ fieldName.substring(1);
try {
Class tCls = t.getClass();
Method getMethod = tCls.getMethod(getMethodName,
new Class[] {});
Object value = getMethod.invoke(t, new Object[] {});
// 判断值的类型后进行强制类型转换
String textValue = null;
if (value instanceof Boolean) {
boolean bValue = (Boolean) value;
textValue = "男";
if (!bValue) {
textValue = "女";
}
} else if (value instanceof Date) {
Date date = (Date) value;
SimpleDateFormat sdf = new SimpleDateFormat(pattern);
textValue = sdf.format(date);
} else if (value instanceof byte[]) {
byte[] bsValue = (byte[]) value;
Image img = Image.getInstance(bsValue);
cell = new PdfPCell(img);
} else {
textValue = value.toString();
}
// 如果不是图片数据,就当做文本处理
if (textValue != null) {
cell = new PdfPCell(new PdfParagraph(textValue));
}
cell.setHorizontalAlignment(Cell.ALIGN_CENTER);
cell.setVerticalAlignment(Cell.ALIGN_MIDDLE);
cell.setBorderColor(Color.green);
table.addCell(cell);
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
// 清理资源
}
}
}
document.add(table);
document.close();
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void main(String[] args) {
// 试学生
ExportPdf<Student> ex = new ExportPdf<Student>();
String[] headers = { "学号", "姓名", "年龄", "性别", "出生日期" };
java.util.List<Student> dataset = new ArrayList<Student>();
dataset.add(new Student(10000001, "张三", 20, true, new Date()));
dataset.add(new Student(20000002, "李四", 24, false, new Date()));
dataset.add(new Student(30000003, "王五", 22, true, new Date()));
// 测试图书
ExportPdf<Book> ex2 = new ExportPdf<Book>();
String[] headers2 = { "图书编号", "图书名称", "图书作者", "图书价格", "图书ISBN",
"图书出版社", "封面图片" };
java.util.List<Book> dataset2 = new ArrayList<Book>();
try {
BufferedInputStream bis = new BufferedInputStream(
new FileInputStream("book.jpg"));
byte[] buf = new byte[bis.available()];
while ((bis.read(buf)) != -1) {
//
}
dataset2.add(new Book(1, "jsp", "leno", 300.33f, "1234567",
"清华出版社", buf));
dataset2.add(new Book(2, "java编程思想", "brucl", 300.33f, "1234567",
"阳光出版社", buf));
dataset2.add(new Book(3, "DOM艺术", "lenotang", 300.33f, "1234567",
"清华出版社", buf));
dataset2.add(new Book(4, "c++经典", "leno", 400.33f, "1234567",
"清华出版社", buf));
dataset2.add(new Book(5, "c#入门", "leno", 300.33f, "1234567",
"汤春秀出版社", buf));
OutputStream out = new FileOutputStream("E://a.pdf");
OutputStream out2 = new FileOutputStream("E://b.pdf");
ex.exportPdf(headers, dataset, out);
ex2.exportPdf(headers2, dataset2, out2);
out.close();
out2.close();
JOptionPane.showMessageDialog(null, "pdf导出成功!");
System.out.println("pdf导出成功！");
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}