| 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... }  
  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。  
 
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