用jsp动态输出excel文档和中文乱码问题的解决

作者：陈万飞

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。

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。 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)); } } 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... }