package lizikj.bigwheel.shop.util.excel;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;

import lizikj.bigwheel.common.vo.agent.Agent;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public class ReadExcelUtils {
/** 总行数 */
private int totalRows = 0;
/** 总列数 */
private int totalCells = 0;
/** 错误信息 */
private String errorInfo;
/**
* 验证excel文件
* @param filePath
* @return
*/
public boolean validateExcel(String filePath) {
/** 检查文件名是否为空或者是否是Excel格式的文件 */
if (filePath == null || !(WDWUtil.isExcel2003(filePath) || WDWUtil.isExcel2007(filePath))) {
errorInfo = "文件名不是excel格式";
return false;
}

/** 检查文件是否存在 */
File file = new File(filePath);
if (file == null || !file.exists()) {
errorInfo = "文件不存在";
return false;
}
return true;

}
/**
* 根据文件名读取excel文件
* @param filePath
* @return
*/
public List<Agent> read(String filePath){

List<Agent> dataLst = new ArrayList<Agent>();

InputStream is = null;

try{
/** 验证文件是否合法 */
if (!validateExcel(filePath)){
System.out.println(errorInfo);
return null;
}

/** 判断文件的类型，是2003还是2007 */
boolean isExcel2003 = true;
if (WDWUtil.isExcel2007(filePath)){
isExcel2003 = false;
}

/** 调用本类提供的根据流读取的方法 */

File file = new File(filePath);

is = new FileInputStream(file);

dataLst = read(is, isExcel2003);

is.close();

} catch (Exception ex) {
ex.printStackTrace();
}finally {
if (is != null) {
try{
is.close();
}catch (IOException e) {
is = null;
e.printStackTrace();
}
}
}
/** 返回最后读取的结果 */
return dataLst;
}

/**
* 根据流读取Excel文件
* @param inputStream
* @param isExcel2003
* @return
*/
public List<Agent> read(InputStream inputStream, boolean isExcel2003){
List<Agent> dataLst = null;
try{

/** 根据版本选择创建Workbook的方式 */
Workbook wb = null;
if (isExcel2003){
wb = new HSSFWorkbook(inputStream);
}else{
wb = new XSSFWorkbook(inputStream);
}
dataLst = read(wb);
}catch (IOException e){
e.printStackTrace();
}
return dataLst;
}

/**
* 读取数据
* @param wb
* @return
*/
private List<Agent> read(Workbook wb){
List<Agent> dataLst = new ArrayList<Agent>();

/** 得到第一个shell */
Sheet sheet = wb.getSheetAt(0);
/** 得到Excel的行数 */
this.totalRows = sheet.getPhysicalNumberOfRows();
/** 得到Excel的列数 */
if (this.totalRows >= 1 && sheet.getRow(0) != null){
this.totalCells = sheet.getRow(0).getPhysicalNumberOfCells();
}
Agent agent = null;
/** 循环Excel的行 */
for (int r = 1; r < this.totalRows; r++) {
Row hssfRow = sheet.getRow(r);
if (hssfRow == null){
continue;
}
agent = new Agent();
Cell name = hssfRow.getCell(0);
Cell pname = hssfRow.getCell(1);
Cell cname = hssfRow.getCell(2);
Cell rname = hssfRow.getCell(3);
Cell address = hssfRow.getCell(4);
Cell contact = hssfRow.getCell(5);
Cell mobile = hssfRow.getCell(6);
Cell companyName = hssfRow.getCell(7);
agent.setParentAgentId(0);
agent.setAgentName(getValue(name));
agent.setAgentRole("K1");
agent.setProvinceId(getValue(pname));
agent.setCityId(getValue(cname));
agent.setRegionId(getValue(rname));
agent.setContact(getValue(contact));
agent.setAddress(getValue(address));
agent.setMobile(getValue(mobile));
agent.setContactName(getValue(contact));
agent.setCompanyName(getValue(companyName));
dataLst.add(agent);
}

return dataLst;

}

@SuppressWarnings("static-access")
private String getValue(Cell hssfCell) {
DecimalFormat df = new DecimalFormat("#");
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(df.format(hssfCell.getNumericCellValue()));
} else {
// 返回字符串类型的值
return String.valueOf(hssfCell.getStringCellValue());
}
}
}

class WDWUtil {

/**
* 是否是2003的excel，返回true是2003
* @param filePath
* @return
*/
public static boolean isExcel2003(String filePath) {
return filePath.matches("^.+\\.(?i)(xls)$");
}

/**
* 是否是2007的excel，返回true是2007
* @param filePath
* @return
*/
public static boolean isExcel2007(String filePath) {
return filePath.matches("^.+\\.(?i)(xlsx)$");
}

}   

来自：http://blog.csdn.net/maxu12345/article/details/47977811

http://blog.csdn.net/mmm333zzz/article/details/7962377

http://www.cnblogs.com/hongten/p/java_poi_excel.html

java的poi 读取exc 文件