exportexcelresult.java

本源码为教学管理信息系统

/*
 * 创建日期 2005-2-18
 */
package com.wygl.printview;

import java.io.ByteArrayOutputStream;
import java.io.OutputStream;

import javax.servlet.http.HttpServletResponse;

import com.opensymphony.webwork.ServletActionContext;
import com.opensymphony.xwork.ActionInvocation;
import com.opensymphony.xwork.Result;
import com.opensymphony.xwork.util.OgnlValueStack;

/**
 * @author Administrator
 * Excel导出结果
 */
public class ExportExcelResult implements Result {	
	
	private ByteArrayOutputStream exportExcel;
	
	/* 
	 * @see com.opensymphony.xwork.Result#execute(com.opensymphony.xwork.ActionInvocation)
	 */
	public void execute(ActionInvocation arg0) throws Exception {
		OgnlValueStack stack = (OgnlValueStack) ServletActionContext.getRequest().getAttribute("webwork.valueStack");		
		exportExcel = (ByteArrayOutputStream) stack.findValue("exportExcel");
		
		if (exportExcel == null) {
			throw new NullPointerException("No exportExcel found");
		}
		
		HttpServletResponse response = ServletActionContext.getResponse();
		response.reset(); 
		response.setContentType("application/vnd.ms-excel;charset=GBK");
		response.setContentLength(exportExcel.size());
		OutputStream out = response.getOutputStream();
		exportExcel.writeTo(out);	            
		exportExcel.close();
		out.close();
	}
}