POI小demo

使用poi需要先下载相关jar包(http://download.csdn.net/detail/wangkunisok/9454545)

poi-3.14-20160307.jar

poi-ooxml-3.14-20160307.jar

poi-ooxml-schemas-3.14-20160307.jar

xmlbeans-2.6.0.jar

PoiUtil.java

 package com.zto.branchaging.web.controller;

 import java.io.IOException;
 import java.io.OutputStream;
 import java.lang.reflect.Field;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.Iterator;
 import java.util.List;

 import org.apache.poi.hssf.usermodel.HSSFCell;
 import org.apache.poi.hssf.usermodel.HSSFCellStyle;
 import org.apache.poi.hssf.usermodel.HSSFRichTextString;
 import org.apache.poi.hssf.usermodel.HSSFRow;
 import org.apache.poi.hssf.usermodel.HSSFSheet;
 import org.apache.poi.hssf.usermodel.HSSFWorkbook;

 /**
  *
  *
  * @author leno
  * @version v1.0
  * @param <T>
  *            应用泛型，代表任意一个符合javabean风格的类
  *            注意这里为了简单起见，boolean型的属性xxx的get器方式为getXxx(),而不是isXxx()
  *            byte[]表jpg格式的图片数据
  */
 public class PoiUtil<T> {

     public void exportExcel(Collection<T> dataset, OutputStream out) {
         exportExcel("POI导出EXCEL文档", null, dataset, out, "yyyy-MM-dd");
     }

     public void exportExcel(String[] headers, Collection<T> dataset,
             OutputStream out) {
         exportExcel("POI导出EXCEL文档", headers, dataset, out, "yyyy-MM-dd");
     }

     public void exportExcel(String[] headers, Collection<T> dataset,
             OutputStream out, String pattern) {
         exportExcel("POI导出EXCEL文档", headers, dataset, out, pattern);
     }

     /**
      * 这是一个通用的方法，利用了JAVA的反射机制，可以将放置在JAVA集合中并且符号一定条件的数据以EXCEL 的形式输出到指定IO设备上
      *
      * @param title
      *            表格标题名
      * @param headers
      *            表格属性列名数组
      * @param dataset
      *            需要显示的数据集合,集合中一定要放置符合javabean风格的类的对象。此方法支持的
      *            javabean属性的数据类型有基本数据类型及String,Date,byte[](图片数据)
      * @param out
      *            与输出设备关联的流对象，可以将EXCEL文档导出到本地文件或者网络中
      * @param pattern
      *            如果有时间数据，设定输出格式。默认为"yyy-MM-dd"
      */
     @SuppressWarnings("unchecked")
     public void exportExcel(String title, String[] headers,
             Collection<T> dataset, OutputStream out, String pattern) {

         List result = new ArrayList();
         List paramterList = Arrays.asList(dataset.toArray());
         // 声明一个工作薄
         HSSFWorkbook workbook = new HSSFWorkbook();

         //设定每个sheet存储的数据量为五万，不能超过六万五
         int pageCount = (int)Math.ceil(dataset.size()/50000)+1;//需要创建的sheet个数
         if(dataset.size()<=50000){
             result = paramterList.subList(0, dataset.size());
         }

         // 生成一个样式
         HSSFCellStyle style = workbook.createCellStyle();
         style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 居中  

         for(int j=0;j<pageCount;j++){
             int startIndex = j*50000;
             int endIndex = startIndex+50000;
             if(pageCount-j==1){
                 endIndex = dataset.size();
             }
             result = paramterList.subList(startIndex, endIndex);
             // 生成一个表格
             HSSFSheet sheet = workbook.createSheet(title+"-"+String.valueOf(j+1));
             // 设置表格默认列宽度为15个字节
             sheet.setDefaultColumnWidth((short) 15);
             sheet.setColumnWidth(1, 24*256);  //设置列宽，第二列24个字符宽
             // 产生表格标题行
             HSSFRow row = sheet.createRow(0);
             for (short i = 0; i < headers.length; i++) {
                 HSSFCell cell = row.createCell(i);
                 cell.setCellStyle(style);
                 HSSFRichTextString text = new HSSFRichTextString(headers[i]);
                 cell.setCellValue(text);
             }
             // 遍历集合数据，产生数据行
             Iterator<T> it = result.iterator();
             int index = 0;
             while (it.hasNext()) {
                 index++;
                 row = sheet.createRow(index);
                 T t = (T) it.next();
                 // 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值
                 Field[] fields = t.getClass().getDeclaredFields();
                 for (short i = 0; i < fields.length; i++) {
                     HSSFCell cell = row.createCell(i);
                     cell.setCellStyle(style);
                     Field field = fields[i];
                     String fieldName = field.getName();
                     String getMethodName = "get"
                             + fieldName.substring(0, 1).toUpperCase()
                             + fieldName.substring(1);
                     try {
                         Class tCls = t.getClass();
                         Method getMethod = tCls.getMethod(getMethodName,
                                 new Class[] {});
                         Object value = getMethod.invoke(t, new Object[] {});

                          // 数据类型都当作字符串简单处理
                         String textValue = String.valueOf(null==value?"":value);

                         if (textValue != null) {
                             cell.setCellValue(textValue);
                         }
                     } catch (SecurityException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                     } catch (NoSuchMethodException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                     } catch (IllegalArgumentException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                     } catch (IllegalAccessException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                     } catch (InvocationTargetException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                     } finally {
                         // 清理资源
                     }
                 }

             }

         }
         try {
             workbook.write(out);
         } catch (IOException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }

     }

 }

POIController.java

package com.branchaging.web.controller;
@Controller
@RequestMapping("/singleAmount")
public class POIController{

    @Autowired
    private IQuantityStatisBiz quantityStatisBiz;

    @RequestMapping("/doExclExport")
    @ResponseBody
    public String doExclExportt(NewLine line,HttpServletRequest req,HttpServletResponse res) {

        String realFilename = "..."+fileNameTime+".xls";
        res.setContentType("application/vnd.ms-excel; charset=utf-8");
        try {
            res.setHeader("Content-Disposition","attachment;filename=" + URLEncoder.encode(realFilename,"UTF-8"));
        } catch (UnsupportedEncodingException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        res.setCharacterEncoding("utf-8");

        PoiUtil<TimeLineAmountExport> ex = new PoiUtil<TimeLineAmountExport>();
        String[] headers = { "排名", "线路名称", "运输类型", "","",""... };

        try {
            OutputStream out=res.getOutputStream();
            //OutputStream out = new FileOutputStream("E://singleAmount.xls");
            ex.exportExcel(headers, listResult, out);
            out.flush();
            out.close();
            System.out.println("excel导出成功！");
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

前台访问：(这种方式是在当前窗口下弹出下载提示，其他两种注释的方式，效果不好)

function doExclExport() {
    var result = doCheck();
    if("back"==result){
        return;
    }
    if($("#endTime").val()==getEndDate()){
        return;
    }

    location.href="/singleAmount/doExclExport?" + 'time=' + $("#endTime").val() + '&type='
        + $("#mySelect").val() + "&ationType=" + $("#typeAtion").val()
        + "&startSite=" + $("#startSite").val() + "&endSite="
        + $("#endSite").val();  

//    window.open("/singleAmount/doExclExport?" + 'time=' + $("#endTime").val() + '&type='
//    + $("#mySelect").val() + "&ationType=" + $("#typeAtion").val()
//    + "&startSite=" + $("#startSite").val() + "&endSite="
//    + $("#endSite").val());

//    var form=$("<form action='/singleAmount/doExclExport' target='_blank' ></form>");
//    form.append('<input type="text"  name="time" value="'+$("#endTime").val()+'"/>');
//    form.append('<input type="text"  name="type" value="'+$("#mySelect").val()+'"/>');
//    form.append('<input type="text"  name="ationType" value="'+$("#typeAtion").val()+'"/>');
//    form.append('<input type="text"  name="startSite" value="'+$("#startSite").val()+'"/>');
//    form.append('<input type="text"  name="endSite" value="'+$("#endSite").val()+'"/>');
//    form.submit();
}