Java Export File (从页面导出Excel文件)

<br> package com.cssp.myTest; <br> <br> <br> import java.io.FileNotFoundException; <br> import java.io.IOException; <br> import java.io.OutputStream; <br> import java.util.ArrayList; <br> import java.util.Iterator; <br> import java.util.List; <br> import java.util.Map; <br> import javax.servlet.http.HttpServletRequest; <br> import javax.servlet.http.HttpServletResponse; <br> import org.springframework.ui.Model; <br> import com.hdlh.framework.utils.DateUtils; <br> <br> <br> import jxl.Workbook; <br> import jxl.format.Alignment; <br> import jxl.format.VerticalAlignment; <br> import jxl.write.Label; <br> import jxl.write.WritableCellFormat; <br> import jxl.write.WritableFont; <br> import jxl.write.WritableSheet; <br> import jxl.write.WritableWorkbook; <br> import jxl.write.WriteException; <br> import jxl.write.biff.RowsExceededException; <br> <br> <br> /** <br>  * 此处文件上传下载Demo所用为jxl方式 <br>  * @author admin <br>  * <br>  */ <br> public class FileUtils { <br> <span></span>/** <br> <span></span>* 下载Excel文件(最下方有方法调用Demo) <br> <span></span>* @param os 输出流 <br> <span></span>* @param sheetName 要创建的Excel中的单元表名称 <br> <span></span>* @param titles 要创建的Excel中的单元表名称的标题 <br> <span></span>* @param list 要保存在单元表中的数据集合对象，其中每一值又是一个List或Object[]对象或 Map对象,表示一行的记录 <br> <span></span>*/ <br> <span></span>@SuppressWarnings("all")//当方法编写完且没有报错的情况后，但方法有一些黄色的警告提示，可以添加这个注解去掉警告，处女座必备 <br> <span></span>public static void createExcel(OutputStream os,String sheetName,String[] titles,List list){ <br> <span></span>WritableWorkbook wwb = null; <br> <span></span>try { <br> <span></span>wwb = Workbook.createWorkbook(os);//创建一个工作薄对象 <br> <span></span>WritableSheet ws = wwb.createSheet(sheetName, 0);//创建工作表：参数1表示工作表的名称;参数2表示是第一个工作表，下标从0开始 <br> <span></span>WritableFont wf = new WritableFont(WritableFont.TAHOMA,12,WritableFont.BOLD,false);//添加字体样式 <br> <span></span>/** <br> <span></span>* 对上面创建字体样式的参数含义说明： <br> <span></span>* 参数一：添加字体名称 <br> <span></span>* 参数二：添加字体大小 <br> <span></span>* 参数三：添加字体样式 <br> <span></span>* 参数四：添加是否斜体 <br> <span></span>* 参数五：添加下划线 UnderlineStyle.NO_UNDERLINE <br> <span></span>* 参数六：添加字体颜色 Colour.BLACK <br> <span></span>*/ <br> <span></span>WritableCellFormat wcf = new WritableCellFormat(wf);//创建自定义字体样式的单元格对象 <br> <span></span>wcf.setVerticalAlignment(VerticalAlignment.CENTRE);//设置垂直居中 <br> <span></span>wcf.setAlignment(Alignment.CENTRE);//居中对齐 <br> <span></span>for(int i=0;i<titles.length;i++){ <br> <span></span>jxl.write.Label labelCFTitle = new jxl.write.Label(i, 0, titles[i], wcf); <br> <span></span>ws.addCell(labelCFTitle); <br> <span></span>ws.setColumnView(i, 28); // 设置列的宽度 <br> <span></span>} <br> <span></span>/*****************************************************************************/ <br> <span></span>//上面为表头设置了字体样式，下面开始为表内容也设置字体样式 <br> <span></span>WritableFont content_wf = new jxl.write.WritableFont(WritableFont.TAHOMA, 8, WritableFont.NO_BOLD, false); <br> <span></span>WritableCellFormat content_wcf = new jxl.write.WritableCellFormat(content_wf); <br> <span></span>content_wcf.setVerticalAlignment(VerticalAlignment.CENTRE); <br> <span></span>content_wcf.setAlignment(Alignment.CENTRE); <br> <span></span>//下面检查传入的list参数下的子对象类型,觉得麻烦的可以省下判断，直接写死，但是还是建议这样写，方便项目中调用。 <br> <span></span>int type=checkArray(list); <br> <span></span>if(type==0){ <br> <span></span>for(int i=0;i<list.size();i++){ <br> <span></span>Object[] subList = (Object[])list.get(i); <br> <span></span>for(int j=0;j<subList.length;j++){ <br> <span></span>String text = ""; <br> <span></span>if(subList[j]!=null)text=subList[j]+""; <br> <span></span>Label labelCF = new Label(j,i+1,text,content_wcf); <br> <span></span>ws.addCell(labelCF); <br> <span></span>} <br> <span></span>} <br> <span></span>}else if(type==1){ <br> <span></span>for(int i=0;i<list.size();i++){ <br> <span></span>List subList = (List)list.get(i); <br> <span></span>for(int j=0;j<subList.size();j++){ <br> <span></span>String text = (String)subList.get(j); <br> <span></span>Label labelCF = new Label(j,i+1,text,content_wcf); <br> <span></span>ws.addCell(labelCF); <br> <span></span>} <br> <span></span>} <br> <span></span>}else if(type==2){ <br> <span></span>for(int i=0;i<list.size();i++){ <br> <span></span>Map map=(Map)list.get(i); <br> <span></span>Iterator iter=map.keySet().iterator(); <br> <span></span>int j=0; <br> <span></span>while(iter.hasNext()){ <br> <span></span>String key=iter.next()+""; <br> <span></span>String text = map.get(key)+""; <br> <span></span>Label labelCF = new Label(j++,i+1,text,content_wcf); <br> <span></span>ws.addCell(labelCF); <br> <span></span>} <br> <span></span>} <br> <span></span>} <br> <span></span>} catch (RowsExceededException e) { <br> <span></span>e.printStackTrace(); <br> <span></span>} catch (FileNotFoundException e) { <br> <span></span>e.printStackTrace(); <br> <span></span>} catch (WriteException e) { <br> <span></span>e.printStackTrace(); <br> <span></span>} catch (IOException e) { <br> <span></span>e.printStackTrace(); <br> <span></span>} <br> <span></span>finally{ <br> <span></span>//关闭Excel工作薄对象 <br> <span></span>try { <br> <span></span>if(wwb!=null){ <br> <span></span>wwb.close(); <br> <span></span>} <br> <span></span>os.close(); <br> <span></span>} catch (WriteException e) { <br> <span></span>e.printStackTrace(); <br> <span></span>} catch (IOException e) { <br> <span></span>e.printStackTrace(); <br> <span></span>} <br> <span></span>} <br> <span></span>} <br> <span></span> <br> <span></span> <br> <span></span>/** <br> <span></span>* 检查list中的子对象，是否MAP ，LIST Or OBJECT[] <br> <span></span>* @param list要检查的对象 <br> <span></span>* */ <br> <span></span>@SuppressWarnings("all") <br> <span></span>private static int checkArray(List list){ <br> <span></span>int ret=0; <br> <span></span>if(list.get(0) instanceof Map){ <br> <span></span>ret=2; <br> <span></span>}else if(list.get(0) instanceof List){ <br> <span></span>ret =1; <br> <span></span>}else{ <br> <span></span>ret=0; <br> <span></span>} <br> <span></span>return ret; <br> <span></span>} <br> <span></span> <br> <span></span>/** <br> <span></span>* 下载Excel文件调用Demo <br> <span></span>* @param request 服务器请求对象 <br> <span></span>* @param response 服务器响应对象 <br> <span></span>* @param model <br> <span></span>* @return <br> <span></span>*/ <br> <span></span>public Model uploadFileDemo(HttpServletRequest request, HttpServletResponse response, <br> <span></span>Model model){ <br> <span></span>try { <br> <span></span>OutputStream os = response.getOutputStream();//响应服务器的输出流对象 <br> <span></span>String tempTime = DateUtils.now();//获取当前日期 DateUtils是自己封闭的类 <br> <span></span>//创建一个由自定义名称加当前日期去掉空格的字符串作为下载的Excel文件名 <br> <span></span>String fileName ="下载文件Demo_"+tempTime.substring(0,4)+ <br> <span></span>tempTime.substring(5,7)+tempTime.substring(8,10) <br> <span></span>+tempTime.substring(11,13)+tempTime.substring(14,16)+tempTime.substring(17,19)+".xls"; <br> <span></span>response.reset();//清空输出流对象 <br> <span></span>response.setContentType("application/msexcel");//定义要输出的文本类型 msexcel为Excel的文体类型 <br> <span></span>//设置返回页面的信息，此句代码可在页面下方出现另存为的对话框，让客户自定义文件保存路径 <br> <span></span>response.setHeader("Content-disposition", "attachment; filename="+ new String(fileName.getBytes("gb2312"),"ISO8859-1")); <br> <span></span>String sheetName = "下载Excel文件Demo表";//工作表sheet的表名 <br> <span></span>String [] titles = {"数据编号","系统名称","厂商名称","系统url","接入开始时间","接入结束时间","负责人姓名","负责人电话"}; <br> <span></span>List<Object[]> list = new ArrayList<Object[]>(); <br> <span></span>/** <br> <span></span>* 创建一个list集合对象，用来存储要保存到Excel中的数据 <br> <span></span>* 此处List<Object[]>类型为例，集合Demo没有数据，实用时自己填充数据到集合中，不然就空异常了 <br> <span></span>*/ <br> <span></span>//调用下载Excel的方法 <br> <span></span>createExcel(os, sheetName, titles, list); <br> <span></span>/**************************************************************/ <br> <span></span>/* <br> <span></span>* 特别说明：页面调用时建议使用form表单提交，例： <br> <span></span>* <form action="此处为后台Controller方法调用的URL" name="excelUpload" ></form> <br> <span></span>* <input type="button" οnclick="upload();" value="导出"/> <br> <span></span>*  <br> <span></span>* function upload(){document.excelUpload.submit(); <span></span>} <br> <span></span>* 如若不使用表单提交的方式，想在ajax中提交处理，页面不会直接出现下载提示框的，还需要自己处理一下。 <br> <span></span>*/ <br> <span></span>} catch (Exception e) { <br> <span></span>e.printStackTrace(); <br> <span></span>} <br> <span></span>return null; <br> <span></span>} <br> } <br>