|
|
最近在網上看到一個用Java來操縱excel的open source,在weblogic上試用了一下,覺得很不錯,特此向大家推薦一下。
首先去http://www.andykhan.com/jexcelapi/index.html下載最新的JExcelApi,把jxl.jar置于你的classpath中。
寫一個JavaBean,利用JExcelApi來動態生成excel文檔，我這里寫一個最簡單的，示意性的。復雜的你可能還要查詢數據庫什么的。
///////////////////////////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, "我愛中國");
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, "中國愛我",wcfFC);
ws.addCell(labelC);
//寫入Exel工作表
wwb.write();
//關閉Excel工作薄對象
wwb.close();
}
//最好寫一個這樣的main方法來測試一下你的這個class是否寫好了。
public static void main(String[] args)throws Exception{
File f=new File("kk.xls");
f.createNewFile();
writeExcel(new FileOutputStream(f));
}
}
寫一個jsp,來利用Test這個Javabean輸出excel文檔。
///////////////////////////test_excel.jsp//////////////////////////
＜%@page import="com.jagie.test.Test" %＞
＜%
response.reset();
response.setContentType("application/vnd.ms-excel");
Test.writeExcel(response.getOutputStream());
%＞
這樣就大功告成了，你用ie訪問test_excel.jsp就能在ie里面打開動態生成的excel文檔了。一點亂碼也沒有。
也許有人會問:response.reset();可不可以不要這一句,我的建議是一定要寫，除非你能保證response的buffer里面沒有別的東西。
還有人也許會問:我在jsp開頭加上＜%@page contentType="application/vnd.ms-excel;charset=GBK" %＞這一句，去掉response.setContentType("application/vnd.ms-excel");行不行?回答這個問題很簡單，就是查看jsp服務器編譯jsp后生成的Java代碼，如果改成這樣，我的welogic7編譯test_excel.jsp后生成的Java文件的示意性代碼是這樣的:
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...
}
很明顯，屏蔽response.setContentType("application/vnd.ms-excel");后，在Test.writeExcel(response.getOutputStream());之前，response.reset(); 之后沒有設置response contenttype的正確類型，當然輸出為亂碼了。而正確輸出excel的jsp的編譯后源碼是這樣的:
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());之前正確的設置了response的輸出內容。所以輸出就正常了。
最后，希望這篇文章能對你有所啟發,如有錯誤之處，敬請批評指正!
jsp技術：JSP動態輸出Excel及中文亂碼的解決，轉載需保留來源！
鄭重聲明：本文版權歸原作者所有，轉載文章僅為傳播更多信息之目的，如作者信息標記有誤，請第一時間聯系我們修改或刪除，多謝。
