JAVA导出PDF实例
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>