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://.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!