JSP动态输出Excel及中文乱码的解决

　　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!




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