使用Itext生成PDF绝对定位流入web网页

public void PDF（）{

<span style="white-space:pre">	</span>ByteArrayOutputStream stream = new ByteArrayOutputStream();

<span style="white-space:pre">	</span>//自定义界面大小，上下左右边距

<span style="white-space:pre">	</span>Document document = new Document(new Rectangle(50,50), 0, 0, 0, 0);

<span style="white-space:pre">	</span>PdfWriter writer = PdfWriter.getInstance(document, stream);

<span style="white-space:pre">	</span>document.open(); // 打开 Document 文档

<span style="white-space:pre">	</span>PdfContentByte cb = writer.getDirectContent();
<span style="white-space:pre">	</span>BaseFont bf = BaseFont.createFont("STSongStd-Light", "UniGB-UCS2-H",false);//设置字体

<span style="white-space:pre">	</span>cb.beginText();

<span style="white-space:pre">	</span>cb.setFontAndSize(bf, 12);//字体和子号

<span style="white-space:pre">	</span>cb.setTextMatrix(50,50);//字体显示位置

<span style="white-space:pre">	</span>cb.showText();//内容

<span style="white-space:pre">	</span>cb.endText();

<span style="white-space:pre">	</span>document.close();//关闭文档

<span style="white-space:pre">	</span>//设置响应文档类型为pdf 
<span style="white-space:pre">	</span>getResponse().setContentType("application/pdf"); 
<span style="white-space:pre">	</span>//设置响应数据大小 
<span style="white-space:pre">	</span>getResponse().setContentLength(stream.size()); 
<span style="white-space:pre">	</span>//将pdf数据流写入响应数据流中 
<span style="white-space:pre">	</span>ServletOutputStream out = getResponse().getOutputStream();

<span style="white-space:pre">	</span>stream.writeTo(out); 
<span style="white-space:pre">	</span>out.flush(); 
<span style="white-space:pre">	</span>out.close();