struts2导出Excel文件

    这里说下struts2导出Excel文件的列子。

    列子比较简单。下面是我们导出Excel需要的jar包。

  struts2需要jar包：commons-logging.jar、freemarker-2.3.8.jar、ognl-2.6.11.jar、struts2-core-2.0.11.1.jar、xwork-2.0.4.jar

excel导出：jxl.jar

下面为配置web.xml的内容：

.....             
	<filter>   
	    <filter-name>struts2</filter-name>   
	    <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>   
	</filter>   
	<filter-mapping>   
	    <filter-name>struts2</filter-name>   
	    <url-pattern>/*</url-pattern>   
	</filter-mapping>   
...... 

下面为struts2的配置文件代码[filename为导出时弹出来的名称]：

<?xml version="1.0" encoding="UTF-8"?>   
	<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd" >   
	<struts>   
	    <package name="platform-default" extends="struts-default">   
	        <action name="excel" class="action.ExcelAction">   
                 <result name="excel" type="stream">   
	                <param name="contentType">   
	                    application/vnd.ms-excel   
	                </param>   
	                <param name="inputName">excelStream</param>   
	                <param name="contentDisposition">   
	                    filename="export.xls"  
	                </param>   
	                <param name="bufferSize">1024</param>   
	            </result>   
	        </action>   
	    </package>   
	</struts> 

Action的代码：

	package action;   
	  
	import java.io.InputStream;   
	import service.IExcelService;   
	import service.impl.ExcelServiceImpl;   
	public class ExcelAction {
	 
	    InputStream excelStream;
	    public String execute(){   
	        IExcelService es = new ExcelServiceImpl();   
	        excelStream = es.getExcelInputStream();   
	        return "excel";   
	    }   
	    //get set...   
	} 

Service的接口代码：

	package service;   
	import java.io.InputStream;   
	public interface IExcelService {   
	    InputStream getExcelInputStream();   
	} 

Service代码：

	package service.impl;   
	  
	import java.io.ByteArrayInputStream;   
	import java.io.ByteArrayOutputStream;   
	import java.io.InputStream;   
	import java.io.OutputStream;   
	  
	import jxl.Workbook;   
	import jxl.write.WritableSheet;   
	import jxl.write.WritableWorkbook;   
	import service.IExcelService;   
	  
	public class ExcelServiceImpl implements IExcelService {   
	  
	    @Override   
	    public InputStream getExcelInputStream() {   
	        //将OutputStream转化为InputStream   
	        ByteArrayOutputStream out = new ByteArrayOutputStream();   
	        putDataOnOutputStream(out);   
	        return new ByteArrayInputStream(out.toByteArray());   
	    }   
	  
	    private void putDataOnOutputStream(OutputStream os) {   
	        jxl.write.Label label;   
	        WritableWorkbook workbook;   
	        try {   
	            workbook = Workbook.createWorkbook(os);   
	            WritableSheet sheet = workbook.createSheet("Sheet1", 0);   
	  
	            label = new jxl.write.Label(0, 0, "struts2导出excel");   
	            sheet.addCell(label);   
	               
	            workbook.write();   
	            workbook.close();   
	        } catch (Exception e) {   
	            e.printStackTrace();   
	        }   
	    }   
	}

主要事项：例子中OutputStream转InputStream是一种简单的实现，但是需要内存比较多