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JAVA导出PDF实例

JavaServletApacheJSPHTML 
阅读更多

一、直接导出成PDF

 

import java.io.FileNotFoundException;
import java.io.FileOutputStream;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.PdfWriter;

public class ItextProduce {

	public static void main(String[] args) {
		Document doc = null;
		try {
			doc = new Document();
			PdfWriter.getInstance(doc, new FileOutputStream("C:\\itext.pdf"));
			doc.open();
			doc.add(new Paragraph("Hello World"));
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (DocumentException e) {
			e.printStackTrace();
		} finally {
			doc.close();
		}
	}

}

 

 

二、由Servlet导出PDF

 

package com.lwf.eus.servlet;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.PdfWriter;

public class ListRocarsReportServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public ListRocarsReportServlet() {
		super();
	}

	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		this.doPost(request, response);
	}

	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		Document doc = new Document();
		ByteArrayOutputStream ba = new ByteArrayOutputStream();
		try {
			PdfWriter writer = PdfWriter.getInstance(doc, ba);
			doc.open();
			doc.add(new Paragraph("Hello World"));

		} catch (DocumentException e) {
			e.printStackTrace();
		}
		doc.close();

		response.setContentType("application/pdf");
		response.setContentLength(ba.size());
		ServletOutputStream out = response.getOutputStream();
		ba.writeTo(out);
		out.flush();
	}

}

 

 

三、由JSP导出成PDF

 

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<%@ page
	import="java.io.ByteArrayOutputStream,
	com.itextpdf.text.Document,
	java.io.DataOutput,java.io.DataOutputStream,
	com.itextpdf.text.Paragraph,
	com.itextpdf.text.DocumentException,
	com.itextpdf.text.Document.*,
	com.itextpdf.text.pdf.*"%>



<%
	response.setContentType("application/pdf");
	Document doc = new Document();
	ByteArrayOutputStream ba = new ByteArrayOutputStream();

	PdfWriter writer = PdfWriter.getInstance(doc, ba);
	doc.open();
	doc.add(new Paragraph("Hello World"));
	doc.close();

	DataOutput output = new DataOutputStream(response.getOutputStream());
	byte[] bytes = ba.toByteArray();
	response.setContentLength(bytes.length);
	for (int i = 0; i < bytes.length; i++) {
		output.writeByte(bytes[i]);
	}
%>

 

jsp导出时会报错:
org.apache.jasper.JasperException: java.lang.IllegalStateException: getOutputStream() has already been called for this response
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:522)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:410)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

 

   报错原因:

JSP调用response.getWriter与response.getOutputStream()相冲突！
解决办法:
在使用完输出流后调用以下两行代码即可：
out.clear();
out = pageContext.pushBody();

 

代码修改为:

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<%@ page
	import="java.io.ByteArrayOutputStream,
	com.itextpdf.text.Document,
	java.io.DataOutput,java.io.DataOutputStream,
	com.itextpdf.text.Paragraph,
	com.itextpdf.text.DocumentException,
	com.itextpdf.text.Document.*,
	com.itextpdf.text.pdf.*"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>

<%
	response.setContentType("application/pdf");
	Document doc = new Document();
	ByteArrayOutputStream ba = new ByteArrayOutputStream();

	PdfWriter writer = PdfWriter.getInstance(doc, ba);
	doc.open();
	doc.add(new Paragraph("Hello World"));
	doc.close();

	DataOutputStream output = new DataOutputStream(response.getOutputStream());
	byte[] bytes = ba.toByteArray();
	response.setContentLength(bytes.length);
	for (int i = 0; i < bytes.length; i++) {
		output.writeByte(bytes[i]);
	}
	output.flush();
	
	//out --jsp 
	out.clear();
	out = pageContext.pushBody();

%>
</body>
</html>

 

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