java中使用poi导出excel表格数据并且可以手动修改导出路径

　　在我们开发项目中，很多时候会提出这样的需求：将前端的某某数据以excel表格导出，今天就给大家写一个简单的模板。

　　这里我们选择使用poi导出excel:

　　第一步：导入需要的jar包到 lib 文件夹下

　　

　　　jar包下载路径：http://download.csdn.net/download/pumpkin09/7077011

　　第二步：添加poi导出工具类

　　　　

package com.yjd.admin.util;

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.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFComment;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
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;
import org.apache.poi.hssf.util.HSSFColor;

/**
 * 利用开源组件POI3.0.2动态导出EXCEL文档 转载时请保留以下信息，注明出处！
 * 
 * @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 ExportExcel<T> {
    public void exportExcel(Collection<T> dataset, OutputStream out) {
        exportExcel("测试POI导出EXCEL文档", null, dataset, out, "yyyy-MM-dd");
    }

    public void exportExcel(String[] headers, Collection<T> dataset,
            OutputStream out) {
        exportExcel("测试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("测试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) {
        // 声明一个工作薄
        HSSFWorkbook workbook = new HSSFWorkbook();
        // 生成一个表格
        HSSFSheet sheet = workbook.createSheet(title);
        // 设置表格默认列宽度为15个字节
        sheet.setDefaultColumnWidth((short) 15);
        // 生成一个样式
        HSSFCellStyle style = workbook.createCellStyle();
        // 设置这些样式
        style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
        style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        style.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style.setBorderTop(HSSFCellStyle.BORDER_THIN);
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        // 生成一个字体
        HSSFFont font = workbook.createFont();
        font.setColor(HSSFColor.VIOLET.index);
        font.setFontHeightInPoints((short) 12);
        font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
        // 把字体应用到当前的样式
        style.setFont(font);
        // 生成并设置另一个样式
        HSSFCellStyle style2 = workbook.createCellStyle();
        style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
        style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
        style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
        style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
        style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
        style2.setBorderTop(HSSFCellStyle.BORDER_THIN);
        style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
        // 生成另一个字体
        HSSFFont font2 = workbook.createFont();
        font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
        // 把字体应用到当前的样式
        style2.setFont(font2);
        // 声明一个画图的顶级管理器
        HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
        // 定义注释的大小和位置,详见文档
        HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
                0, 0, 0, (short) 4, 2, (short) 6, 5));
        // 设置注释内容
        comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));
        // 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.
        comment.setAuthor("leno");
        // 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 = dataset.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(style2);
                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[] {});
                    // 判断值的类型后进行强制类型转换
                    String textValue = null;
                    // if (value instanceof Integer) {
                    // int intValue = (Integer) value;
                    // cell.setCellValue(intValue);
                    // } else if (value instanceof Float) {
                    // float fValue = (Float) value;
                    // textValue = new HSSFRichTextString(
                    // String.valueOf(fValue));
                    // cell.setCellValue(textValue);
                    // } else if (value instanceof Double) {
                    // double dValue = (Double) value;
                    // textValue = new HSSFRichTextString(
                    // String.valueOf(dValue));
                    // cell.setCellValue(textValue);
                    // } else if (value instanceof Long) {
                    // long longValue = (Long) value;
                    // cell.setCellValue(longValue);
                    // }
                    if (value instanceof Boolean) {
                        boolean bValue = (Boolean) value;
                        textValue = "男";
                        if (!bValue) {
                            textValue = "女";
                        }
                    } else if (value instanceof Date) {
                        Date date = (Date) value;
                        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
                        textValue = sdf.format(date);
                    } else if (value instanceof byte[]) {
                        // 有图片时，设置行高为60px;
                        row.setHeightInPoints(60);
                        // 设置图片所在列宽度为80px,注意这里单位的一个换算
                        sheet.setColumnWidth(i, (short) (35.7 * 80));
                        // sheet.autoSizeColumn(i);
                        byte[] bsValue = (byte[]) value;
                        HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0,
                                1023, 255, (short) 6, index, (short) 6, index);
                        anchor.setAnchorType(2);
                        patriarch.createPicture(anchor, workbook.addPicture(
                                bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));
                    } else {
                        // 其它数据类型都当作字符串简单处理
                        textValue = value.toString();
                    }
                    // 如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成
                    if (textValue != null) {
                        Pattern p = Pattern.compile("^//d+(//.//d+)?$");
                        Matcher matcher = p.matcher(textValue);
                        if (matcher.matches()) {
                            // 是数字当作double处理
                            cell.setCellValue(Double.parseDouble(textValue));
                        } else {
                            HSSFRichTextString richString = new HSSFRichTextString(
                                    textValue);
                            HSSFFont font3 = workbook.createFont();
                            font3.setColor(HSSFColor.BLUE.index);
                            richString.applyFont(font3);
                            cell.setCellValue(richString);
                        }
                    }
                } catch (SecurityException e) {
                    e.printStackTrace();
                } catch (NoSuchMethodException e) {
                    e.printStackTrace();
                } catch (IllegalArgumentException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                } catch (InvocationTargetException e) {
                    e.printStackTrace();
                } finally {
                    // 清理资源
                }
            }
        }
        try {
            workbook.write(out);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

　　第三步：由于我使用的的spring-mvc框架，所以在Controller调用上面的工具类ExportExcel

　

package com.yjd.admin.vo;

import java.util.Date;

public class P2pLoanPlanVo {
         private Date repayDate;
        private double repayAmount;
        private Integer repayDays;
        private Integer repayYqDays;
        private Double lateAmount;
        private String isPosPaid;
        private String statusName;
        private String isSysPay;
        public Date getRepayDate() {
            return repayDate;
        }
        public void setRepayDate(Date repayDate) {
            this.repayDate = repayDate;
        }
        public double getRepayAmount() {
            return repayAmount;
        }
        public void setRepayAmount(double repayAmount) {
            this.repayAmount = repayAmount;
        }
        public Integer getRepayDays() {
            return repayDays;
        }
        public void setRepayDays(Integer repayDays) {
            this.repayDays = repayDays;
        }
        public Integer getRepayYqDays() {
            return repayYqDays;
        }
        public void setRepayYqDays(Integer repayYqDays) {
            this.repayYqDays = repayYqDays;
        }
        public Double getLateAmount() {
            return lateAmount;
        }
        public void setLateAmount(Double lateAmount) {
            this.lateAmount = lateAmount;
        }
        public String getIsPosPaid() {
            return isPosPaid;
        }
        public void setIsPosPaid(String isPosPaid) {
            this.isPosPaid = isPosPaid;
        }
        public String getStatusName() {
            return statusName;
        }
        public void setStatusName(String statusName) {
            this.statusName = statusName;
        }
        public String getIsSysPay() {
            return isSysPay;
        }
        public void setIsSysPay(String isSysPay) {
            this.isSysPay = isSysPay;
        }
        
        
        
        
        
}

/**
     * 导出excel数据
     * @param id
     * @param m
     * @return
     */
    @RequestMapping("/exportExcel")
    public void exportExcel(@RequestParam("id") Integer id, Model m,HttpServletRequest req, HttpServletResponse resp) {
        try {
            
            ExportExcel<P2pLoanPlanVo> ex = new ExportExcel<P2pLoanPlanVo>();
            String[] headers = {"最迟还款日", "还款金额","剩余几天","逾期几天", "罚息","是否垫付","状态","是否发放收益"};
            List<P2pLoanPlanVo> dataset = new ArrayList<P2pLoanPlanVo>();
            List<P2pLoanPlan> plans = this.planService.getListByLoan(id);
            for (int i = 0; i < plans.size(); i++) {
                P2pLoanPlanVo p2pLoanPlanVo = new P2pLoanPlanVo();
                
                p2pLoanPlanVo.setRepayDate(plans.get(i).getRepayDate());
                p2pLoanPlanVo.setRepayAmount(plans.get(i).getRepayAmount());
                
                if(plans.get(i).getRepayDays() >= 0 && plans.get(i).getStatus() == 0){
                    p2pLoanPlanVo.setRepayDays(plans.get(i).getRepayDays());
                }else{
                    p2pLoanPlanVo.setRepayDays(0);
                }
                if(plans.get(i).getRepayDays() < 0 && plans.get(i).getStatus() == 0){
                    p2pLoanPlanVo.setRepayYqDays(-plans.get(i).getRepayDays());
                }else{
                    p2pLoanPlanVo.setRepayYqDays(0);
                }
                
                p2pLoanPlanVo.setLateAmount(plans.get(i).getLateAmount());
                String IsPosPaid = "";
                if(plans.get(i).getIsPosPaid()==true){
                    IsPosPaid = "已垫付";
                }else{
                    IsPosPaid = "未垫付";
                }
                p2pLoanPlanVo.setIsPosPaid(IsPosPaid);
                p2pLoanPlanVo.setStatusName(plans.get(i).getStatusName());
                String IsSysPay ="";
                if(plans.get(i).getIsSysPay() == true){
                    IsSysPay = "已发放收益";
                }else{
                    IsSysPay = "未发放收益";
                }
                p2pLoanPlanVo.setIsSysPay(IsSysPay);
                
                dataset.add(p2pLoanPlanVo);
                
            }
            try {
                req.setCharacterEncoding("UTF-8");
                resp.setCharacterEncoding("UTF-8");
                resp.setContentType("application/x-download");
                
                String filedisplay = "还款计划.xls";
                //防止文件名含有中文乱码
                filedisplay = new String( filedisplay.getBytes("gb2312"), "ISO8859-1" );
                resp.setHeader("Content-Disposition", "attachment;filename="+ filedisplay);
                
                OutputStream out = resp.getOutputStream();
                ex.exportExcel(headers, dataset, out);
                out.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (Exception e) {
            Exceptions.getExceptionMsg(e, logger);
        }
    }

注意：此处ExportExcel<T>工具类中的泛型对应P2pLoanPlanVo这个类，P2pLoanPlanVo类中的属性要对应exportExcel（）接口中headers中每个值并且都要有值，不允许为空，若有不足的地方还望各位大神多多指点！

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