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web开发使用poi 导出excel

web开发使用poi 导出excel

作者: 烟雾袅绕 | 来源:发表于2016-07-19 14:40 被阅读247次

    1: 添加jar依赖

    <dependency>
          <groupId>org.apache.poi</groupId>
          <artifactId>poi-ooxml</artifactId>
       <version>3.9</version>
    </dependency>
    

    2:编写工具类

    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.sql.Date;
    import java.text.SimpleDateFormat;
    import java.util.Collection;
    import java.util.Iterator;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    
    import org.apache.commons.lang.ObjectUtils.Null;
    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;
    
    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 HSSFWorkbook exportExcel(String[] headers, Collection<T> dataset) {
         return exportExcel("测试POI导出EXCEL文档", headers, dataset, "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) {
                       // 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();
           }
    
       }
       
       
       public HSSFWorkbook exportExcel(String title, String[] headers,
               Collection<T> dataset, 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_LEFT);
           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==null) {
                           textValue = null;
                       }else 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) {
                       // 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
                   }
               }
           }
           return workbook;        
       }   
    }
    

    3:在web controller 里获得数据源后直接调用工具类(注意:在前台点击事件导出表格的时候, 点击事件要使用 location.href="/bmw/ex?city="+id; 发送请求,不然不会出现下载界面)

     @Get("/ex")
       public void getexcle2(HttpServletRequest request,
               HttpServletResponse response, @Param("city") int city) {
           ExportExcel<BmwEntity> ex = new ExportExcel<BmwEntity>();
           String[] headers = { "id", "车源型号", "卖家名称", "电话", "地址","城市" };
           //这里获得数据源
                   List<BmwEntity> dataset = bmwService.getData(city);
           HSSFWorkbook book = ex.exportExcel(headers, dataset);
           response.setContentType("application/vnd.ms-excel");
           response.setHeader("Content-disposition",
                   "attachment;filename=bmw.xls");
           OutputStream ouputStream;
           try {
               ouputStream = response.getOutputStream();
               book.write(ouputStream);
               ouputStream.flush();
               ouputStream.close();
           } catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
    
       }
    
    
    
    

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