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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