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();
}