java操作 读写取 excel poi.jar

 

读

package com.ywx.test.poi;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
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.poifs.filesystem.POIFSFileSystem;

 

public class PoiReadExcel {

 

    public static void main(String[] args) throws Exception {

       File file = new File("d:\\ExcelDemo.xls");

       String[][] result = getData(file, 1);

       int rowLength = result.length;

       for(int i=0;i<rowLength;i++) {

           for(int j=0;j<result[i].length;j++) {

              System.out.print(result[i][j]+"\t\t");

           }

           System.out.println();

       }

      

    }

    /**

     * 读取Excel的内容，第一维数组存储的是一行中格列的值，二维数组存储的是多少个行

     * @param file 读取数据的源Excel

     * @param ignoreRows 读取数据忽略的行数，比喻行头不需要读入 忽略的行数为1

     * @return 读出的Excel中数据的内容

     * @throws FileNotFoundException

     * @throws IOException

     */

    public static String[][] getData(File file, int ignoreRows)

           throws FileNotFoundException, IOException {

       List<String[]> result = new ArrayList<String[]>();

       int rowSize = 0;

       BufferedInputStream in = new BufferedInputStream(new FileInputStream(

              file));

       // 打开HSSFWorkbook

       POIFSFileSystem fs = new POIFSFileSystem(in);

       HSSFWorkbook wb = new HSSFWorkbook(fs);

       HSSFCell cell = null;

       for (int sheetIndex = 0; sheetIndex < wb.getNumberOfSheets(); sheetIndex++) {

           HSSFSheet st = wb.getSheetAt(sheetIndex);

           // 第一行为标题，不取

           for (int rowIndex = ignoreRows; rowIndex <= st.getLastRowNum(); rowIndex++) {

              HSSFRow row = st.getRow(rowIndex);

              if (row == null) {

                  continue;

              }

              int tempRowSize = row.getLastCellNum() + 1;

              if (tempRowSize > rowSize) {

                  rowSize = tempRowSize;

              }

              String[] values = new String[rowSize];

              Arrays.fill(values, "");

              boolean hasValue = false;

              for (short columnIndex = 0; columnIndex <= row.getLastCellNum(); columnIndex++) {

                  String value = "";

                  cell = row.getCell(columnIndex);

                  if (cell != null) {

                     // 注意：一定要设成这个，否则可能会出现乱码

                     //cell.setEncoding(HSSFCell.ENCODING_UTF_16);

                     switch (cell.getCellType()) {

                     case HSSFCell.CELL_TYPE_STRING:

                         value = cell.getStringCellValue();

                         break;

                     case HSSFCell.CELL_TYPE_NUMERIC:

                         if (HSSFDateUtil.isCellDateFormatted(cell)) {

                            Date date = cell.getDateCellValue();

                            if (date != null) {

                                value = new SimpleDateFormat("yyyy-MM-dd")

                                       .format(date);

                            } else {

                                value = "";

                            }

                         } else {

                            value = new DecimalFormat("0").format(cell

                                   .getNumericCellValue());

                         }

                         break;

                     case HSSFCell.CELL_TYPE_FORMULA:

                         // 导入时如果为公式生成的数据则无值

                         if (!cell.getStringCellValue().equals("")) {

                            value = cell.getStringCellValue();

                         } else {

                            value = cell.getNumericCellValue() + "";

                         }

                         break;

                     case HSSFCell.CELL_TYPE_BLANK:

                         break;

                     case HSSFCell.CELL_TYPE_ERROR:

                         value = "";

                         break;

                     case HSSFCell.CELL_TYPE_BOOLEAN:

                         value = (cell.getBooleanCellValue() == true ? "Y"

                                : "N");

                         break;

                     default:

                         value = "";

                     }

                  }

                  if (columnIndex == 0 && value.trim().equals("")) {

                     break;

                  }

                  values[columnIndex] = rightTrim(value);

                  hasValue = true;

              }

 

              if (hasValue) {

                  result.add(values);

              }

           }

       }

       in.close();

       String[][] returnArray = new String[result.size()][rowSize];

       for (int i = 0; i < returnArray.length; i++) {

           returnArray[i] = (String[]) result.get(i);

       }

       return returnArray;

    }

   

    /**

     * 去掉字符串右边的空格

     * @param str 要处理的字符串

     * @return 处理后的字符串

     */

     public static String rightTrim(String str) {

       if (str == null) {

           return "";

       }

       int length = str.length();

       for (int i = length - 1; i >= 0; i--) {

           if (str.charAt(i) != 0x20) {

              break;

           }

           length--;

       }

       return str.substring(0, length);

    }

}

 

写

package com.ywx.test.poi;

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;

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

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

    public void exportExcel(String[] headers, Collection<T> dataset,
            OutputStream out, String pattern) {
        exportExcel("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) 18);
        // 生成一个样式
        HSSFCellStyle style = workbook.createCellStyle();
        // 设置这些样式
        style.setFillForegroundColor(HSSFColor.WHITE.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) 15);
        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.WHITE.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);
        if(headers!=null&&headers.length!=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 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 if (value instanceof Integer || value instanceof String ||value instanceof Double) {
                        //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 static void main(String[] args) {
    
    }
}

package com.ywx.test.poi;

public class TestWrite {
    public static void main(String[] args) {}
}




/*
ExportExcel1<UsersVO> excell = new ExportExcel1<UsersVO>();
String[] headers = { "客户编号",
                    "客户名字", 
                    "客户性别(1->男,0->女)", 
                    "客户年龄", 
                    "客户生日", 
                    "身份证号", 
                    "家庭住址",
                    "电子邮件", 
                    "联系方式",
                    "身体状况",
                    "用户密码"};

ArrayList<UsersVO> list1 =useSer.getAllUsersInfo();

response.setContentType("octets/stream");
try {
    response.addHeader(
            "Content-Disposition",
            "attachment;filename="
                    + new String("客户.xls".getBytes("utf-8"),
                            "iso8859-1"));
//    response.addHeader(
//            "Content-Disposition",
//            "attachment;filename="+"1.xls");
    OutputStream out2 = response.getOutputStream();
    excell.exportExcel(headers, list1, out2);
    out2.flush();
    out2.close();
    int count=1;
} catch (FileNotFoundException e) {
    try {
        
        response.getWriter().print("lost");
        response.getWriter().flush();
        response.getWriter().close();
    } catch (IOException e1) {
        e1.printStackTrace();
    }

} catch (Exception e) {
    try {
        e.printStackTrace();
        response.getWriter().print("fail");
        response.getWriter().flush();
        response.getWriter().close();
    } catch (IOException e1) {
        
        e1.printStackTrace();
    }
}*/