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关键字:JExcelApi,jsp
最近在网上看到一个用java来操纵excel的open source,在weblogic上试用了一下,觉得很不错,特此向大家推荐一下。
1.首先去http://www.andykhan.com/jexcelapi/index.html下载最新的JExcelApi,把jxl.jar置于你的classpath中
2.写一个javaBean,利用JExcelApi来动态生成excel文档，我这里写一个最简单的,示意性的。复杂的你可能还要查询数据库什么的。
- ///////////////////////////Test.java///////////////////////////////////////////
- package com.jagie.test;
- import java.io.*;
- import jxl.*;
- import jxl.write.*;
- import jxl.format.*;
-
- import java.util.*;
- import java.awt.Color;
- public class Test{
-
-
- public static void writeExcel(OutputStream os) throws Exception {
- jxl.write.WritableWorkbook wwb = Workbook.createWorkbook(os);
- jxl.write.WritableSheet ws = wwb.createSheet("TestSheet1", 0);
- jxl.write.Label labelC = new jxl.write.Label(0, 0, "我爱中国");
- ws.addCell(labelC);
- jxl.write.WritableFont wfc = new jxl.write.WritableFont(WritableFont.ARIAL,
- 20, WritableFont.BOLD, false,
- UnderlineStyle.NO_UNDERLINE, jxl.format.Colour.GREEN);
- jxl.write.WritableCellFormat wcfFC = new jxl.write.WritableCellFormat(wfc);
- wcfFC.setBackground(jxl.format.Colour.RED);
- labelC = new jxl.write.Label(6, 0, "中国爱我",wcfFC);
- ws.addCell(labelC);
- //写入Exel工作表
- wwb.write();
- //关闭Excel工作薄对象
- wwb.close();
-
- }
-
- //最好写一个这样的main方法来测试一下你的这个class是否写好了。
- public static void main(String[] args)throws Exception{
- File f=new File("kk.xls");
- f.createNewFile();
- writeExcel(new FileOutputStream(f));
- }
-
- }
-
- 3.写一个jsp,来利用Test这个javabean输出excel文档
-
- ///////////////////////////test_excel.jsp//////////////////////////
-
- <%@page import="com.jagie.test.Test" %>
- <%
- response.reset();
- response.setContentType("application/vnd.ms-excel");
- Test.writeExcel(response.getOutputStream());
- %>
这样就大功告成了，你用ie访问test_excel.jsp就能在ie里面打开动态生成的excel文档了。一点乱码也没有。
也许有人会问:response.reset();可不可以不要这一句,我的建议是一定要写，除非你能保证response的buffer里面没有别的东西。
还有人也许会问:我在jsp开头加上<%@page contentType="application/vnd.ms-excel;charset=GBK" %>这一句，去掉response.setContentType("application/vnd.ms-excel");行不行?回答这个问题很简单，就是查看jsp服务器编译jsp后生成的java代码，如果改成这样，我的welogic7编译test_excel.jsp后生成的java文件的示意性代码是这样的:
- public void _jspService(javax.servlet.http.HttpServletRequest request,
- javax.servlet.http.HttpServletResponse response) throws java.io.IOException,
- javax.servlet.ServletException {
-
- // declare and set well-known variables:
- javax.servlet.ServletConfig config = getServletConfig();
- javax.servlet.ServletContext application = config.getServletContext();
- javax.servlet.jsp.tagext.Tag _activeTag = null;
- // variables for Tag extension protocol
-
- Object page = this;
- javax.servlet.jsp.JspWriter out;
- javax.servlet.jsp.PageContext pageContext =
- javax.servlet.jsp.JspFactory.getDefaultFactory().getPageContext(this,
- request, response, null, true, 8192, true);
-
- response.setHeader("Content-Type",
- "application/vnd.ms-excel; charset=GBK");
- out = pageContext.getOut();
- JspWriter _originalOut = out;
-
- javax.servlet.http.HttpSession session = request.getSession(true);
-
-
-
- try { // error page try block
-
- response.setContentType("application/vnd.ms-excel;charset=GBK");
-
- out.print("\r\n\r\n\r\n\r\n");
- out.print("\r\n");
- //[ /test_excel.jsp; Line: 6]
- response.reset(); //[ /test_excel.jsp; Line: 7]
- //response.setContentType("application/vnd.ms-excel");
- //[ /test_excel.jsp; Line: 8]
- Test.writeExcel(response.getOutputStream()); //[ /test_excel.jsp; Line: 9]
- } catch (Throwable __ee) {
- while (out != null && out != _originalOut) out = pageContext.popBody();
- ((weblogic.servlet.jsp.PageContextImpl)pageContext).handlePageException((Throwable)__ee);
- }
-
-
- //before final close brace...
- }
很明显，屏蔽response.setContentType("application/vnd.ms-excel"); 后，在Test.writeExcel(response.getOutputStream());之前，
response.reset(); 之后没有设置response contenttype的正确类型，当然输出为乱码了。而正确输出excel的jsp的编译后源码是这样的:
- public void _jspService(javax.servlet.http.HttpServletRequest request,
- javax.servlet.http.HttpServletResponse response) throws java.io.IOException,
- javax.servlet.ServletException
- {
-
- // declare and set well-known variables:
- javax.servlet.ServletConfig config = getServletConfig();
- javax.servlet.ServletContext application = config.getServletContext();
- javax.servlet.jsp.tagext.Tag _activeTag = null;
- // variables for Tag extension protocol
-
- Object page = this;
- javax.servlet.jsp.JspWriter out;
- javax.servlet.jsp.PageContext pageContext =
- javax.servlet.jsp.JspFactory.getDefaultFactory().getPageContext(
- this, request, response, null, true, 8192, true);
-
- out = pageContext.getOut();
- JspWriter _originalOut = out;
-
- javax.servlet.http.HttpSession session = request.getSession(true);
-
-
-
- try { // error page try block
-
- out.print("\r\n");
- //[ /test_excel.jsp; Line: 2]
- response.reset(); //[ /test_excel.jsp; Line: 3]
- response.setContentType("application/vnd.ms-excel"); //[ /test_excel.jsp; Line: 4]
- Test.writeExcel(response.getOutputStream()); //[ /test_excel.jsp; Line: 5]
- } catch (Throwable __ee) {
- while (out != null && out != _originalOut) out = pageContext.popBody();
- ((weblogic.servlet.jsp.PageContextImpl)pageContext).handlePageException((Throwable)__ee);
- }
-
-
- //before final close brace...
- }
大家可以看到在response.reset(); 之后,Test.writeExcel(response.getOutputStream());之前正确的设置了response的输出内容。所以输出就正常了。
最后，希望这篇文章能对你有所启发,如有错误之处，敬请批评指正!
参考资料:
http://sunrise.x168.net/java/030118,11,29,36.html
http://www.mail-archive.com/poi-user@jakarta.apache.org/msg02800.html
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