struts2导出excel笔记

 

 

l例子很简单，就一个Action类和一个Service类

 

1.所需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

2.配置

   .....          
              <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>
  ......

 

<?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>

3.Action实现

 

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...
}

4.Service实现

a.接口

 

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

b.实现类

 

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();
		}
	}
}

 

 这样例子就完成了：

直接访问：http://127.0.0.1:8080/excel/excel.action 就可以导出excel

 

说明：

1、例子中OutputStream转InputStream是一种简单的实现，但是需要内存比较多，可以参考：
http://ostermiller.org/convert_java_outputstream_inputstream.html

2、参考实现：http://merrygrass.iteye.com/blog/558274

3、java报表JXL和POI打印设置

 

代码在附件中，jar包自己下载后导入即可

 

 

问题：

 

//横向打印
sheet.getSettings().setOrientation(PageOrientation.LANDSCAPE);
//默认行高（似乎不起作用）
sheet.getSettings().setDefaultRowHeight(510);
//设置行宽
sheet.getSettings().setDefaultColumnWidth(10);

横向设置和行宽起作用，但行高不起作用，望高手回答

 

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默认行高问题解决：

此方法针对excel2003，在创建sheet后，添加如下代码

 

for(int i=0;i<65536;i++){
	sheet.setRowView(i, 360);
}

 补充：jxl中20个高度对应excel的1个高度，jxl的1个宽度对应excel的7个宽度

 

 

 

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