java寫入pdf文件

Ⅰ 如何運用java組件itext生成pdf

Controller層（param為數據）

byte[]bytes=PdfUtils.createPdf(param);
ByteArrayInputStreaminStream=newByteArrayInputStream(bytes);
//設置輸出的格式
response.setContentType("bin");
response.setHeader("content-disposition","attachment;filename="+URLEncoder.encode(itemName+"（評審意見）.pdf","UTF-8"));
//循環取出流中的數據
byte[]b=newbyte[2048];
intlen;
while((len=inStream.read(b))>0)
response.getOutputStream().write(b,0,len);

inStream.close();

Service層（param為數據）

public static byte[] createPdf(Map<String,Object> param) {

byte[] result= null;

ByteArrayOutputStream baos = null;

//支流程評審信息匯總

List<CmplncBranchRvwInfoDTO> branchRvwInfos = (List<CmplncBranchRvwInfoDTO>) param.get("branchRvwInfos");

//主流程評審信息匯總

List<CmplncMainRvwInfoDTO> mainRvwInfos = (List<CmplncMainRvwInfoDTO>) param.get("mainRvwInfos");

//主評審信息

CmplncRvwFormDTO rvwFormDTO = (CmplncRvwFormDTO) param.get("rvwFormDTO");

//附件列表

List<FileInfoDTO> fileList = (List<FileInfoDTO>) param.get("fileList");

//專業公司

String legalEntityDeptDesc = (String) param.get("legalEntityDeptDesc");

String legalEntitySonDeptDesc = (String) param.get("legalEntitySonDeptDesc");

//設置頁邊距

Document doc = new Document(PageSize.A4, 20, 20, 60, 20);

try {

baos = new ByteArrayOutputStream();//構建位元組輸出流

PdfWriter writer = PdfWriter.getInstance(doc,baos);

//頁眉頁腳字體

BaseFont bf = null;

BaseFont bFont = null;

try {

bFont = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.WINANSI, BaseFont.EMBEDDED);

bf = BaseFont.createFont("STSong-Light", "UniGB-UCS2-H",BaseFont.NOT_EMBEDDED);

} catch (Exception e) {

e.printStackTrace();

}

Font footerFont = new Font(bFont, 10, Font.NORMAL);

Font title = new Font(bf,15,Font.BOLD);

Font content = new Font(bf,9,Font.NORMAL);

Font chinese = new Font(bf, 10, Font.BOLD);

/**

* HeaderFooter的第2個參數為非false時代表列印頁碼

* 頁眉頁腳中也可以加入圖片，並非只能是文字

*/

HeaderFooter header=new HeaderFooter(new Phrase("法律合規評審系統",title),false);

//設置是否有邊框等

header.setBorder(Rectangle.NO_BORDER);

header.setAlignment(1);

doc.setHeader(header);

HeaderFooter footer=new HeaderFooter(new Phrase("-",footerFont),new Phrase("-",footerFont));

/**

* 0左 1中 2右

*/

footer.setAlignment(1);

footer.setBorder(Rectangle.NO_BORDER);

doc.setFooter(footer);

doc.open();

//doc.add(new Paragraph("評審意見:",chinese));

//7列

PdfPTable table = new PdfPTable(7);

PdfPCell cell;

table.addCell(new Paragraph("評審項目編號",chinese));

table.addCell(new Paragraph(rvwFormDTO.getRvwItemCode(),content));

cell = new PdfPCell(new Paragraph("評審項目類型",chinese));

cell.setColspan(2);

table.addCell(cell);

String rvwItemParentType = (String) param.get("rvwItemParentType");

String rvwItemType = (String) param.get("rvwItemType");

String rvwItemTwoType = (String) param.get("rvwItemTwoType");

cell = new PdfPCell(new Paragraph(rvwItemParentType+"/"+rvwItemType+"/"+rvwItemTwoType,content));

cell.setColspan(3);

table.addCell(cell);

table.addCell(new Paragraph("申請人姓名",chinese));

table.addCell(new Paragraph(rvwFormDTO.getApplicantName(),content));

cell = new PdfPCell(new Paragraph("申請人所在部門",chinese));

cell.setColspan(2);

table.addCell(cell);

cell = new PdfPCell(new Paragraph(rvwFormDTO.getAplcntDeptName(),content));

cell.setColspan(3);

table.addCell(cell);

table.addCell(new Paragraph("錄入人姓名",chinese));

table.addCell(new Paragraph(rvwFormDTO.getRecordName(),content));

cell = new PdfPCell(new Paragraph("項目涉及金額",chinese));

cell.setColspan(2);

table.addCell(cell);

table.addCell(new Paragraph(String.valueOf(rvwFormDTO.getInvolveAmount()==null?0:rvwFormDTO.getInvolveAmount()),content));

table.addCell(new Paragraph("幣種",chinese));

String involveAmountType = (String) param.get("involveAmountType");

table.addCell(new Paragraph(involveAmountType,content));

table.addCell(new Paragraph("專業公司",chinese));

cell = new PdfPCell(new Paragraph(legalEntityDeptDesc+"->"+legalEntitySonDeptDesc,content));

cell.setColspan(6);

table.addCell(cell);

table.addCell(new Paragraph("項目名稱",chinese));

cell = new PdfPCell(new Paragraph(rvwFormDTO.getItemName(),content));

cell.setColspan(6);

table.addCell(cell);

table.addCell(new Paragraph("項目概述",chinese));

cell = new PdfPCell(new Paragraph(rvwFormDTO.getItemOverview(),content));

cell.setColspan(6);

table.addCell(cell);

table.addCell(new Paragraph("評審需求",chinese));

cell = new PdfPCell(new Paragraph(rvwFormDTO.getRvwDemand(),content));

cell.setColspan(6);

table.addCell(cell);

table.addCell(new Paragraph("申請人自我評估",chinese));

cell = new PdfPCell(new Paragraph(rvwFormDTO.getApplicantSelfAssmnt(),content));

cell.setColspan(6);

table.addCell(cell);

/* table.addCell(new Paragraph("同步抄送",chinese));

cell = new PdfPCell(new Paragraph(rvwFormDTO.getSyncsenderNames(),content));

cell.setColspan(6);

table.addCell(cell);*/

int infoNum = 0;

if(fileList.size() > 0){

//附件信息

cell = new PdfPCell(new Paragraph("附件信息",chinese));

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

cell.setRowspan(fileList.size()+1);

table.addCell(cell);

//序號

cell = new PdfPCell(new Paragraph("序號",chinese));

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

//附件名稱

cell = new PdfPCell(new Paragraph("附件名稱",chinese));

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

//上傳時間

cell = new PdfPCell(new Paragraph("上傳時間",chinese));

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

//上傳人

cell = new PdfPCell(new Paragraph("上傳人",chinese));

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

//附件類型

cell = new PdfPCell(new Paragraph("附件類型",chinese));

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

//法律合規評審

cell = new PdfPCell(new Paragraph("法律合規評審",chinese));

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

for (FileInfoDTO file : fileList) {

infoNum++;

//序號

cell = new PdfPCell(new Paragraph(infoNum+"",content));

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

//附件名稱

cell = new PdfPCell(new Paragraph(file.getFileName(),content));

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

//上傳時間

cell = new PdfPCell(new Paragraph(file.getUploadTimeFormat(),content));

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

//上傳人

cell = new PdfPCell(new Paragraph(file.getUploadName(),content));

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

//附件類型

String fileType;

if("1".equals(file.getFileType())){

fileType = "合同文件";

}else if("99".equals(file.getFileType())){

fileType = "支持文檔";

}else{

fileType = "";

}

cell = new PdfPCell(new Paragraph(fileType,content));

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

//法律合規評審

String typeRvwStatus;

if("1".equals(file.getTypeRvwStatus())){

typeRvwStatus = "經審查附件無重大法律合規問題";

}else if("2".equals(file.getTypeRvwStatus())){

typeRvwStatus = "退回修改";

}else{

typeRvwStatus = "";

}

cell = new PdfPCell(new Paragraph(typeRvwStatus,content));

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

}

}else{

//附件信息

cell = new PdfPCell(new Paragraph("附件信息",chinese));

table.addCell(cell);

cell = new PdfPCell(new Paragraph("沒有附件",content));

cell.setColspan(6);

table.addCell(cell);

}

cell = new PdfPCell(new Paragraph("評審意見",chinese));

cell.setRowspan(mainRvwInfos.size()+branchRvwInfos.size());

//居中

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

if(mainRvwInfos.size()>0){

cell = new PdfPCell(new Paragraph("主評審意見",chinese));

cell.setRowspan(mainRvwInfos.size());

//居中

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

infoNum = 0;

for (CmplncMainRvwInfoDTO dto : mainRvwInfos) {

infoNum++;

//序號

cell = new PdfPCell(new Paragraph(infoNum+"",content));

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

//評審意見

PdfPTable branchRvwInfosTable = new PdfPTable(1);

cell = new PdfPCell(new Paragraph(delHTMLTag(dto.getRvwOpinion()),content));

cell.disableBorderSide(2);

branchRvwInfosTable.addCell(cell);

//評審人和評審時間

cell = new PdfPCell(new Paragraph(dto.getRvwUmName()+"/"+getStringDate(dto.getRvwTime()),content));

cell.setHorizontalAlignment(Element.ALIGN_RIGHT);

cell.disableBorderSide(1);

cell.setPaddingTop(5);

branchRvwInfosTable.addCell(cell);

PdfPCell branchRvwInfosCell = new PdfPCell(branchRvwInfosTable);

branchRvwInfosCell.setColspan(4);

table.addCell(branchRvwInfosCell);

}

doc.add(table);

}

if(branchRvwInfos.size()>0){

cell = new PdfPCell(new Paragraph("支評審意見",chinese));

cell.setRowspan(branchRvwInfos.size());

//居中

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

infoNum = 0;

for (CmplncBranchRvwInfoDTO dto : branchRvwInfos) {

infoNum++;

//序號

cell = new PdfPCell(new Paragraph(infoNum+"",content));

cell.setUseAscender(true);

cell.setHorizontalAlignment(Element.ALIGN_CENTER); //水平居中

cell.setVerticalAlignment(Element.ALIGN_MIDDLE); //垂直居中

table.addCell(cell);

//評審意見

PdfPTable branchRvwInfosTable = new PdfPTable(1);

cell = new PdfPCell(new Paragraph(delHTMLTag(dto.getRvwOpinion()),content));

cell.disableBorderSide(2);

branchRvwInfosTable.addCell(cell);

//評審人和評審時間

cell = new PdfPCell(new Paragraph(dto.getRvwUmName()+"/"+getStringDate(dto.getRvwTime()),content));

cell.setHorizontalAlignment(Element.ALIGN_RIGHT);

cell.disableBorderSide(1);//隱藏上邊框

cell.setPaddingTop(5);

branchRvwInfosTable.addCell(cell);

PdfPCell branchRvwInfosCell = new PdfPCell(branchRvwInfosTable);

branchRvwInfosCell.setColspan(4);

table.addCell(branchRvwInfosCell);

}

doc.add(table);

}

if(doc != null){

doc.close();

}

result =baos.toByteArray();

} catch (DocumentException e) {

e.printStackTrace();

}finally{

if(baos != null){

try {

baos.close();

} catch (IOException e) {

log.error("PDF異常", e);

}

}

}

return result;

}

工具

/**

* 去掉HTML標簽

* @param htmlStr

* @return

*/

public static String delHTMLTag(String htmlStr){

if (htmlStr!=null){

String regEx_script="<script[^>]*?>[\s\S]*?<\/script>"; //定義script的正則表達式

String regEx_style="<style[^>]*?>[\s\S]*?<\/style>"; //定義style的正則表達式

String regEx_html="<[^>]+>"; //定義HTML標簽的正則表達式

Pattern p_script=Pattern.compile(regEx_script,Pattern.CASE_INSENSITIVE);

Matcher m_script=p_script.matcher(htmlStr);

htmlStr=m_script.replaceAll(""); //過濾script標簽

Pattern p_style=Pattern.compile(regEx_style,Pattern.CASE_INSENSITIVE);

Matcher m_style=p_style.matcher(htmlStr);

htmlStr=m_style.replaceAll(""); //過濾style標簽

Pattern p_html=Pattern.compile(regEx_html,Pattern.CASE_INSENSITIVE);

Matcher m_html=p_html.matcher(htmlStr);

htmlStr=m_html.replaceAll(""); //過濾html標簽

Pattern p_enter = Pattern.compile("\s*| | | ");

Matcher m_enter = p_enter.matcher(htmlStr);

htmlStr = m_enter.replaceAll("");

}

return htmlStr.trim().replaceAll("&nbsp;", ""); //返迴文本字元串

}

/**

* @return返回字元串格式 yyyy-MM-dd HH:mm:ss

*/

public static String getStringDate(Date date) {

SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

String dateString = formatter.format(date);

return dateString;

}

Ⅱ java創建pdf文件寫入不進去

可以用生成PDF報表的Java組件--iText。
具體實現方法如下：1、導入itext-2。1。5。jar跟itextasian-1。5。2。jar兩個包到項目里，2、建立一個pdf文件。
一般情況下，iText使用在有以下一個要求的項目中：1。內容無法提前利用：取決於用戶的輸入或實時的資料庫信息。2。由於內容，頁面過多，PDF文檔不能手動生成。3。文檔需在無人參與，批處理模式下自動創建。4。內容被定製或個性化。

Ⅲ Java如何使用Java向PDF頁面中添加文本

試試這個教程，需要依賴免費版的Spire.Pdf.jar包

importjava.awt.*;
importjava.awt.geom.Point2D;
importjava.awt.geom.Rectangle2D;
importjava.io.*;
importcom.spire.pdf.PdfPageBase;
importcom.spire.pdf.graphics.*;

{

	publicstaticvoidmain(String[]args)throwsFileNotFoundException,IOException{
		
			//創建PdfDocument對象
		PdfDocumentdoc=newPdfDocument();
		
	//添加一頁
	PdfPageBasepage=doc.getPages().add();
	
	//標題文字
	Stringtitle="標題";

	//創建單色畫刷對象
	PdfSolidBrushbrush1=newPdfSolidBrush(newPdfRGBColor(Color.BLUE));
	PdfSolidBrushbrush2=newPdfSolidBrush(newPdfRGBColor(Color.BLACK));
	
	//創建TrueType字體對象
	PdfTrueTypeFontfont1=newPdfTrueTypeFont(newFont("ArialUnicodeMS",Font.PLAIN,14),true);
	PdfTrueTypeFontfont2=newPdfTrueTypeFont(newFont("ArialUnicodeMS",Font.PLAIN,10),true);
	
	//創建PdfStringFormat對象
	PdfStringFormatformat1=newPdfStringFormat();
	format1.setAlignment(PdfTextAlignment.Center);//設置文字居中

//使用drawString方法繪制標題文字
	page.getCanvas().drawString(title,font1,brush1,newPoint2D.Float(page.getActualBounds(true).width/2,0),format1);
	
	//從txt文件讀取內容到字元串
	Stringbody=readFileToString("C:\Users\Administrator\Desktop\bodyText.txt");
	
	//創建PdfStringFormat對象
	PdfStringFormatformat2=newPdfStringFormat();
	format2.setParagraphIndent(20);//設置段首縮進
	
	//創建Rectangle2D對象
	Rectangle2D.Floatrect=newRectangle2D.Float(0,30,page.getActualBounds(true).width,page.getActualBounds(true).height);
	
	//使用drawString方法在矩形區域繪制主體文字
	page.getCanvas().drawString(body,font2,brush2,rect,format2);
	
	//保存到PDF文檔
	doc.saveToFile("ouput.pdf");
	}
	
	//自定義方法讀取txt文件內容到字元串
(Stringfilepath)throwsFileNotFoundException,IOException{
	
		StringBuildersb=newStringBuilder();
		Strings="";
		BufferedReaderbr=newBufferedReader(newFileReader(filepath));

		while((s=br.readLine())!=null){
			sb.append(s+"
");
		}
		br.close();
		Stringstr=sb.toString();	
		returnstr;
		}	
		
	}

Ⅳ java實現將圖片寫到pdf文件尾部

要寫pdf文件的話，可以使用itext，這個可以寫文字或者圖片，輸出到pdf文件

Ⅳ java中怎麼利用poi和itext生成pdf文檔

生成PDF文檔代碼如下：

packagepoi.itext;
importjava.io.FileOutputStream;
importjava.io.IOException;
importjava.awt.Color;
importcom.lowagie.text.*;
importcom.lowagie.text.pdf.*;
importcom.lowagie.text.pdf.BaseFont;
/**
*創建Pdf文檔
*@authorAdministrator
*
*/
publicclassHelloPdf
{
publicstaticvoidmain(String[]args)throwsException
{
BaseFontbfChinese=BaseFont.createFont("STSong-Light","UniGB-UCS2-H",BaseFont.NOT_EMBEDDED);
FontFontChinese=newFont(bfChinese,12,Font.NORMAL);
//第一步，創建document對象
RectanglerectPageSize=newRectangle(PageSize.A4);

//下面代碼設置頁面橫置
//rectPageSize=rectPageSize.rotate();

//創建document對象並指定邊距
Documentdoc=newDocument(rectPageSize,50,50,50,50);
Documentdocument=newDocument();
try
{
//第二步,將Document實例和文件輸出流用PdfWriter類綁定在一起
//從而完成向Document寫，即寫入PDF文檔
PdfWriter.getInstance(document,newFileOutputStream("src/poi/itext/HelloWorld.pdf"));
//第3步,打開文檔
document.open();
//第3步,向文檔添加文字.文檔由段組成
document.add(newParagraph("HelloWorld"));
Paragraphpar=newParagraph("世界你好",FontChinese);
document.add(par);
PdfPTabletable=newPdfPTable(3);
for(inti=0;i<12;i++)
{
if(i==0)
{
PdfPCellcell=newPdfPCell();
cell.setColspan(3);
cell.setBackgroundColor(newColor(180,180,180));
cell.addElement(newParagraph("表格頭",FontChinese));
table.addCell(cell);
}
else
{
PdfPCellcell=newPdfPCell();
cell.addElement(newParagraph("表格內容",FontChinese));
table.addCell(cell);
}
}
document.add(table);
}
catch(DocumentExceptionde)
{
System.err.println(de.getMessage());
}
catch(IOExceptionioe)
{
System.err.println(ioe.getMessage());
}
//關閉document
document.close();

System.out.println("生成HelloPdf成功！");
}


}

希望對你有幫助。

Ⅵ java中如何實現向已有的PDF文件插入附件

可以用Spire.Pdf for Java類庫給PDF文檔添加附件，下面的代碼是插入Excel和Word附件給你參考：

import com.spire.pdf.annotations.*;

import com.spire.pdf.attachments.PdfAttachment;

import com.spire.pdf.graphics.*;

import java.awt.*;

import java.awt.geom.Dimension2D;

import java.awt.geom.Rectangle2D;

import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

public class AttachFiles {
public static void main(String[] args) throws IOException {

//創建PdfDocument對象

PdfDocument doc = new PdfDocument();

//載入PDF文檔

doc.loadFromFile("C:\Users\Administrator\Desktop\sample.pdf");

//添加附件到PDF

PdfAttachment attachment = new PdfAttachment("C:\Users\Administrator\Desktop\使用說明書.docx");

doc.getAttachments().add(attachment);

//繪制標簽

String label = "財務報表.xlsx";

PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial Unicode MS",Font.PLAIN,12),true);

double x = 35;

double y = doc.getPages().get(0).getActualSize().getHeight() - 200;

doc.getPages().get(0).getCanvas().drawString(label, font, PdfBrushes.getOrange(), x, y);

//添加註釋附件到PDF

String filePath = "C:\Users\Administrator\Desktop\財務報表.xlsx";

byte[] data = toByteArray(filePath);

Dimension2D size = font.measureString(label);

Rectangle2D bound = new Rectangle2D.Float((float) (x + size.getWidth() + 2), (float) y, 10, 15);

PdfAttachmentAnnotation annotation = new PdfAttachmentAnnotation(bound, filePath, data);

annotation.setColor(new PdfRGBColor(new Color(0, 128, 128)));

annotation.setFlags(PdfAnnotationFlags.Default);

annotation.setIcon(PdfAttachmentIcon.Graph);

annotation.setText("點擊打開財務報表.xlsx");

doc.getPages().get(0).getAnnotationsWidget().add(annotation);

//保存文檔

doc.saveToFile("Attachments.pdf");
}

//讀取文件到byte數組

public static byte[] toByteArray(String filePath) throws IOException {

File file = new File(filePath);

long fileSize = file.length();

if (fileSize > Integer.MAX_VALUE) {

System.out.println("file too big...");

return null;

}

FileInputStream fi = new FileInputStream(file);

byte[] buffer = new byte[(int) fileSize];

int offset = 0;

int numRead = 0;

while (offset < buffer.length && (numRead = fi.read(buffer, offset, buffer.length - offset)) >= 0) {

offset += numRead;

}

if (offset != buffer.length) {

throw new IOException("Could not completely read file "
+ file.getName());

}

fi.close();

return buffer;

}

}

效果：

Ⅶ java如何創建pdf文件，並將資料庫數據寫入pdf

寫入PDF？ 可以，不過需要下載操作 PDF 的JAR包！操作起來不是太麻煩，不過就是生成的時間比較長。。。

flex 是 flash的一種延伸，flash 對於網站載入來說本來就比較慢，比較的消耗資源，生成PDF 可想而知！

其次 flex 發布到jobss tomcat 等伺服器中時，你的 flex 是編譯成flash，還是直接將xml放入容器中讓其自動生成flash呢？ 如果是的話，那反應就更慢了。。。

再後者，flex 雖然說是 flash 只要客戶端支持flash就能看見 你的網站，但flex 需要在jobss tomcat 等容器中配置的，有免費的有收費的，它們的配置方法都不一樣的。。。

好了就說到這里，雖然有點廢話，並且與主題無關，但希望對LZ有幫助！

Ⅷ 怎麼用java代碼生成pdf文檔

package com.qhdstar.java.pdf;
import java.awt.Color;
import java.io.FileOutputStream;

import com.lowagie.text.Chapter;
import com.lowagie.text.Document;
import com.lowagie.text.Font;
import com.lowagie.text.FontFactory;
import com.lowagie.text.PageSize;
import com.lowagie.text.Paragraph;
import com.lowagie.text.Section;
import com.lowagie.text.pdf.PdfWriter;

/**
* 描述：TODO 【JAVA生成PDF】
* <p>
*
* @title GeneratePDF
* @author SYJ
* @email [email protected]
* @date 2013-4-6
* @version V1.0
*/
public class GeneratePDF {

public static void main(String[] args) {

//調用第一個方法，向C盤生成一個名字為ITextTest.pdf 的文件
try {
writeSimplePdf();
}
catch (Exception e) { e.printStackTrace(); }

//調用第二個方法，向C盤名字為ITextTest.pdf的文件，添加章節。
try {
writeCharpter();
}
catch (Exception e) { e.printStackTrace(); }

}

public static void writeSimplePdf() throws Exception {

// 1.新建document對象
// 第一個參數是頁面大小。接下來的參數分別是左、右、上和下頁邊距。
Document document = new Document(PageSize.A4, 50, 50, 50, 50);

// 2.建立一個書寫器(Writer)與document對象關聯，通過書寫器(Writer)可以將文檔寫入到磁碟中。
// 創建 PdfWriter 對象 第一個參數是對文檔對象的引用，第二個參數是文件的實際名稱，在該名稱中還會給出其輸出路徑。
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("C:\\ITextTest.pdf"));

// 3.打開文檔
document.open();

// 4.向文檔中添加內容
// 通過 com.lowagie.text.Paragraph 來添加文本。可以用文本及其默認的字體、顏色、大小等等設置來創建一個默認段落
document.add(new Paragraph("First page of the document."));
document.add(new
Paragraph("Some more text on the first page with different color and
font type.", FontFactory.getFont(FontFactory.COURIER, 14, Font.BOLD, new
Color(255, 150, 200))));

// 5.關閉文檔
document.close();
}

/**
* 添加含有章節的pdf文件
*
* @throws Exception
*/
public static void writeCharpter() throws Exception {

// 新建document對象 第一個參數是頁面大小。接下來的參數分別是左、右、上和下頁邊距。
Document document = new Document(PageSize.A4, 20, 20, 20, 20);

// 建立一個書寫器(Writer)與document對象關聯，通過書寫器(Writer)可以將文檔寫入到磁碟中。
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("c:\\ITextTest.pdf"));

// 打開文件
document.open();

// 標題
document.addTitle("Hello mingri example");

// 作者
document.addAuthor("wolf");

// 主題
document.addSubject("This example explains how to add metadata.");
document.addKeywords("iText, Hello mingri");
document.addCreator("My program using iText");

// document.newPage();
// 向文檔中添加內容
document.add(new Paragraph("\n"));
document.add(new Paragraph("\n"));
document.add(new Paragraph("\n"));
document.add(new Paragraph("\n"));
document.add(new Paragraph("\n"));
document.add(new Paragraph("First page of the document."));
document.add(new Paragraph("First page of the document."));
document.add(new Paragraph("First page of the document."));
document.add(new Paragraph("First page of the document."));
document.add(new
Paragraph("Some more text on the first page with different color and
font type.", FontFactory.getFont(FontFactory.defaultEncoding, 10,
Font.BOLD, new Color(0, 0, 0))));
Paragraph title1 = new
Paragraph("Chapter 1", FontFactory.getFont(FontFactory.HELVETICA, 18,
Font.BOLDITALIC, new Color(0, 0, 255)));

// 新建章節
Chapter chapter1 = new Chapter(title1, 1);
chapter1.setNumberDepth(0);
Paragraph
title11 = new Paragraph("This is Section 1 in Chapter 1",
FontFactory.getFont(FontFactory.HELVETICA, 16, Font.BOLD, new Color(255,
0, 0)));
Section section1 = chapter1.addSection(title11);
Paragraph someSectionText = new Paragraph("This text comes as part of section 1 of chapter 1.");
section1.add(someSectionText);
someSectionText = new Paragraph("Following is a 3 X 2 table.");
section1.add(someSectionText);
document.add(chapter1);

// 關閉文檔
document.close();
}

}