java的poi技术读取和导入Excel

发布时间：2020-12-14 06:26:56 所属栏目：Java 来源：网络整理

导读：div class="cnblogs_Highlighter"项目结构： div class="cnblogs_Highlighter"a href="http://www.cnblogs.com/hongten/gallery/image/111987.html"gt;http://www.cnblogs.com/hongten/gallery/image/111987.html div class="cnblogs_Highlighter"?用到的Exc

<div class="cnblogs_Highlighter">项目结构：
<div class="cnblogs_Highlighter"><a href="http://www.cnblogs.com/hongten/gallery/image/111987.html">http://www.cnblogs.com/hongten/gallery/image/111987.html
<div class="cnblogs_Highlighter">?用到的Excel文件：
<div class="cnblogs_Highlighter"><a href="http://www.cnblogs.com/hongten/gallery/image/111988.html">http://www.cnblogs.com/hongten/gallery/image/111988.html
<div class="cnblogs_Highlighter">?
<div class="cnblogs_Highlighter"><span style="color: #ff0000;">XlsMain .java 类
<div class="cnblogs_Highlighter">//该类有main方法，主要负责运行程序，同时该类中也包含了用poi读取Excel(2003版)
<div class="cnblogs_Highlighter">
<pre class="brush:java;gutter:false;">?
<pre class="brush:java;gutter:false;">import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

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

/**

@author Hongten
参考地址：http://hao0610.iteye.com/blog/1160678
*/
public class XlsMain {

public static void main(String[] args) throws IOException {
XlsMain xlsMain = new XlsMain();
XlsDto xls = null;
List list = xlsMain.readXls();
```
 try {
     XlsDto2Excel.xlsDto2Excel(list);
 } catch (Exception e) {
     e.printStackTrace();
 }
 for (int i = 0; i < list.size(); i++) {
     xls = (XlsDto) list.get(i);
     System.out.println(xls.getXh() + "    " + xls.getXm() + "    "
             + xls.getYxsmc() + "    " + xls.getKcm() + "    "
             + xls.getCj());
 }
```
}

/**
- 读取xls文件内容
- @return List对象
- @throws IOException
- 输入/输出(i/o)异常
  */
  private List readXls() throws IOException {
  InputStream is = new FileInputStream("pldrxkxxmb.xls");
  HSSFWorkbook hssfWorkbook = new HSSFWorkbook(is);
  XlsDto xlsDto = null;
  List list = new ArrayList();
  // 循环工作表Sheet
  for (int numSheet = 0; numSheet < hssfWorkbook.getNumberOfSheets(); numSheet++) {
  HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(numSheet);
  if (hssfSheet == null) {
  continue;
  }
  // 循环行Row
  for (int rowNum = 1; rowNum <= hssfSheet.getLastRowNum(); rowNum++) {
  HSSFRow hssfRow = hssfSheet.getRow(rowNum);
  if (hssfRow == null) {
  continue;
  }
  xlsDto = new XlsDto();
  // 循环列Cell
  // 0学号 1姓名 2学院 3课程名 4 成绩
  // for (int cellNum = 0; cellNum <=4; cellNum++) {
  HSSFCell xh = hssfRow.getCell(0);
  if (xh == null) {
  continue;
  }
  xlsDto.setXh(getValue(xh));
  HSSFCell xm = hssfRow.getCell(1);
  if (xm == null) {
  continue;
  }
  xlsDto.setXm(getValue(xm));
  HSSFCell yxsmc = hssfRow.getCell(2);
  if (yxsmc == null) {
  continue;
  }
  xlsDto.setYxsmc(getValue(yxsmc));
  HSSFCell kcm = hssfRow.getCell(3);
  if (kcm == null) {
  continue;
  }
  xlsDto.setKcm(getValue(kcm));
  HSSFCell cj = hssfRow.getCell(4);
  if (cj == null) {
  continue;
  }
  xlsDto.setCj(Float.parseFloat(getValue(cj)));
  list.add(xlsDto);
  }
  }
  return list;
  }
/**
- 得到Excel表中的值
- @param hssfCell
- Excel中的每一个格子
- @return Excel中每一个格子中的值
  */
  @SuppressWarnings("static-access")
  private String getValue(HSSFCell hssfCell) {
  if (hssfCell.getCellType() == hssfCell.CELL_TYPE_BOOLEAN) {
  // 返回布尔类型的值
  return String.valueOf(hssfCell.getBooleanCellValue());
  } else if (hssfCell.getCellType() == hssfCell.CELL_TYPE_NUMERIC) {
  // 返回数值类型的值
  return String.valueOf(hssfCell.getNumericCellValue());
  } else {
  // 返回字符串类型的值
  return String.valueOf(hssfCell.getStringCellValue());
  }
  }

}

import org.apache.poi.hssf.usermodel.HSSFCell;
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;

public class XlsDto2Excel {

/**
 * 
 * @param xls
 *            XlsDto实体类的一个对象
 * @throws Exception
 *             在导入Excel的过程中抛出异常
 */
public static void xlsDto2Excel(List<XlsDto> xls) throws Exception {
    // 获取总列数
    int CountColumnNum = xls.size();
    // 创建Excel文档
    HSSFWorkbook hwb = new HSSFWorkbook();
    XlsDto xlsDto = null;
    // sheet 对应一个工作页
    HSSFSheet sheet = hwb.createSheet("pldrxkxxmb");
    HSSFRow firstrow = sheet.createRow(0); // 下标为0的行开始
    HSSFCell[] firstcell = new HSSFCell[CountColumnNum];
    String[] names = new String[CountColumnNum];
    names[0] = "学号";
    names[1] = "姓名";
    names[2] = "学院";
    names[3] = "课程名";
    names[4] = "成绩";
    for (int j = 0; j < CountColumnNum; j++) {
        firstcell[j] = firstrow.createCell(j);
        firstcell[j].setCellValue(new HSSFRichTextString(names[j]));
    }
    for (int i = 0; i < xls.size(); i++) {
        // 创建一行
        HSSFRow row = sheet.createRow(i + 1);
        // 得到要插入的每一条记录
        xlsDto = xls.get(i);
        for (int colu = 0; colu <= 4; colu++) {
            // 在一行内循环
            HSSFCell xh = row.createCell(0);
            xh.setCellValue(xlsDto.getXh());
            HSSFCell xm = row.createCell(1);
            xm.setCellValue(xlsDto.getXm());
            HSSFCell yxsmc = row.createCell(2);
            yxsmc.setCellValue(xlsDto.getYxsmc());
            HSSFCell kcm = row.createCell(3);
            kcm.setCellValue(xlsDto.getKcm());
            HSSFCell cj = row.createCell(4);
            cj.setCellValue(xlsDto.getCj());

(xlsDto.getMessage());
}
}
// 创建文件输出流，准备输出电子表格
OutputStream out = new FileOutputStream("POI2Excel/pldrxkxxmb.xls");
hwb.write(out);
out.close();
System.out.println("数据库导出成功");
}

}

后台输出：

数据库导出成功1.0??? hongten??? 信息技术学院??? 计算机网络应用基础??? 80.02.0??? 王五??? 信息技术学院??? 计算机网络应用基础??? 81.03.0??? 李胜基??? 信息技术学院??? 计算机网络应用基础??? 82.04.0??? 五班古??? 信息技术学院??? 计算机网络应用基础??? 83.05.0??? 蔡诗芸??? 信息技术学院??? 计算机网络应用基础??? 84.0?

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