java_poi

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.commons.io.FileUtils;
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;
import org.junit.Test;

public class poi_write {

@Test
public void testWrite() {
final String [] str = {"id", "姓名", "性别"};
//创建Excel工作薄
HSSFWorkbook workbook = new HSSFWorkbook();
//创建Excel工作表
HSSFSheet sheet = workbook.createSheet();
//创建第一行
HSSFRow row = sheet.createRow(0);
//定义单元格
HSSFCell cell = null;

//添加表头，为第一行填充内容
for (int i = 0; i < str.length; i++) {
cell = row.createCell(i);
cell.setCellValue(str[i]);
}

//追加数据，创建十行，为每行添加数据，每行三个单元格，下表依次0，1，2
for (int i = 1; i <= 10; i++) {
HSSFRow rows = sheet.createRow(i);
HSSFCell cell_id = rows.createCell(0);
cell_id.setCellValue(i+"");
HSSFCell cell_name = rows.createCell(1);
cell_name.setCellValue("name:"+i);
HSSFCell cell_sex = rows.createCell(2);
cell_sex.setCellValue("男");
}

//文件保存路径
File file = new File("E:/tmp/poi_text.xls");
try{
if(!file.exists()){
file.createNewFile();
}
FileOutputStream fileOut = new FileOutputStream(file);//创建一个文件输出流对象
workbook.write(fileOut);
fileOut.close();//关闭输出流对象
}catch (Exception e) {
e.printStackTrace();
}
System.out.println("Excel文件已生成");
}

@Test
public  void testRead() {
final File file = new File("E:/tmp/poi_text.xls");
if(file.exists()){
try {
//生成workbook
HSSFWorkbook workbook = new HSSFWorkbook(FileUtils.openInputStream(file));
// workbook.getSheet("Sheet0");//获得指定的工作表
// HSSFSheet sheet = workbook.getSheet("Sheet0");
//workbook.getSheetAt(0);//默认获得第一个工作表
HSSFSheet sheet = workbook.getSheetAt(0);

int firstRowNum = 0;
//获得当前sheet最后一行行号
int lastRowNum = sheet.getLastRowNum();
for (int i = firstRowNum; i <= lastRowNum; i++) {
HSSFRow row = sheet.getRow(i);
//获得当前行最后单元格列号
int lastCellNum = row.getLastCellNum();
for (int j = 0; j < lastCellNum; j++) {
HSSFCell cell = row.getCell(j);
String value = cell.getStringCellValue();
System.out.print(value+" ");
}
System.out.println("");
}
} catch (IOException e) {
e.printStackTrace();
}
}else{
System.out.println("读取文件不存在");
}
}

}