依赖包下载：http://xiazai.jb51.net/201407/tools/java-excel-dependency(jb51.net).rar
Excel工具类ExcelUtil.java源码：
package com.itjh.javaUtil;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.DecimalFormat;
import java.util.linkedList;
import java.util.List;
import javax.servlet.http.HttpServletResponse;
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;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.DateUtil;
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.ss.usermodel.WorkbookFactory;
public class ExcelUtil {
// excel文件路径
private String path = "";
// 写入excel时，是否自动扩展列宽度来符合内容。
private boolean autoColumnWidth = false;
public ExcelUtil() {
}
public ExcelUtil(String path) {
this.path = path;
}
public List read(int sheetOrder) throws FileNotFoundException,
IOException, InvalidFormatException {
FileInputStream fis = new FileInputStream(path);
Workbook workbook = WorkbookFactory.create(fis);
if (fis != null) {
fis.close();
}
Sheet sheet = workbook.getSheetAt(sheetOrder);
// 用来记录excel值
List valueList = new linkedList();
// 循环遍历每一行、每一列。
for (Row row : sheet) {
// 每一行
Object[] rowObject = null;
for (Cell cell : row) {
// cell.getCellType是获得cell里面保存的值的type
switch (cell.getCellType()) {
case Cell.CELL_TYPE_BOOLEAN:
// 得到Boolean对象的方法
rowObject = CollectionUtil.addObjectToArray(rowObject,
cell.getBooleanCellValue());
break;
case Cell.CELL_TYPE_NUMERIC:
// 先看是否是日期格式
if (DateUtil.isCellDateFormatted(cell)) {
// 读取日期格式
rowObject = CollectionUtil.addObjectToArray(rowObject,
cell.getDateCellValue());
} else {
DecimalFormat df = new DecimalFormat();
// 单元格的值,替换掉,
String value = df.format(cell.getNumericCellValue())
.replace(",", "");
// 读取数字
rowObject = CollectionUtil.addObjectToArray(rowObject,
value);
}
break;
case Cell.CELL_TYPE_FORMULA:
// 读取公式
rowObject = CollectionUtil.addObjectToArray(rowObject,
cell.getCellFormula());
break;
case Cell.CELL_TYPE_STRING:
// 读取String
rowObject = CollectionUtil.addObjectToArray(rowObject, cell
.getRichStringCellValue().toString());
break;
}
}
// 将这行添加到list。
valueList.add(rowObject);
}
return valueList;
}
public String read(int sheetOrder, int colum, int row) throws Exception {
FileInputStream fis = new FileInputStream(path);
Workbook workbook = WorkbookFactory.create(fis);
if (fis != null) {
fis.close();
}
Sheet sheet = workbook.getSheetAt(sheetOrder);
Row rows = sheet.getRow(row - 1);
Cell cell = rows.getCell(colum - 1);
String content = cell.getStringCellValue();
return content;
}
public void write(int sheetOrder, int colum, int row, String content)
throws Exception {
FileInputStream fis = new FileInputStream(path);
Workbook workbook = WorkbookFactory.create(fis);
if (fis != null) {
fis.close();
}
Sheet sheet = workbook.getSheetAt(sheetOrder);
Row rows = sheet.createRow(row - 1);
Cell cell = rows.createCell(colum - 1);
cell.setCellValue(content);
FileOutputStream fileOut = new FileOutputStream(path);
workbook.write(fileOut);
fileOut.close();
}
public int getSheetLastRowNum(int sheetOrder) throws IOException,
InvalidFormatException {
FileInputStream fis = new FileInputStream(path);
Workbook workbook = WorkbookFactory.create(fis);
if (fis != null) {
fis.close();
}
Sheet sheet = workbook.getSheetAt(sheetOrder);
return sheet.getLastRowNum();
}
public void makeExcel(String sheetName, String[] fieldName,
List data) throws IOException {
// 在内存中生成工作薄
HSSFWorkbook workbook = makeWorkBook(sheetName, fieldName, data);
// 截取文件夹路径
String filePath = path.substring(0, path.lastIndexOf("\"));
// 如果路径不存在，创建路径
File file = new File(filePath);
// System.out.println(path+"-----------"+file.exists());
if (!file.exists())
file.mkdirs();
FileOutputStream fileOut = new FileOutputStream(path);
workbook.write(fileOut);
fileOut.close();
}
public void makeStreamExcel(String excelName, String sheetName,
String[] fieldName, List data,
HttpServletResponse response) throws IOException {
OutputStream os = null;
response.reset(); // 清空输出流
os = response.getOutputStream(); // 取得输出流
response.setHeader("Content-disposition", "attachment; filename="
+ new String(excelName.getBytes(), "ISO-8859-1")); // 设定输出文件头
response.setContentType("application/msexcel"); // 定义输出类型
// 在内存中生成工作薄
HSSFWorkbook workbook = makeWorkBook(sheetName, fieldName, data);
os.flush();
workbook.write(os);
}
private HSSFWorkbook makeWorkBook(String sheetName, String[] fieldName,
List data) {
// 用来记录最大列宽,自动调整列宽。
Integer collength[] = new Integer[fieldName.length];
// 产生工作薄对象
HSSFWorkbook workbook = new HSSFWorkbook();
// 产生工作表对象
HSSFSheet sheet = workbook.createSheet();
// 为了工作表能支持中文,设置字符集为UTF_16
workbook.setSheetName(0, sheetName);
// 产生一行
HSSFRow row = sheet.createRow(0);
// 产生单元格
HSSFCell cell;
// 写入各个字段的名称
for (int i = 0; i < fieldName.length; i++) {
// 创建第一行各个字段名称的单元格
cell = row.createCell((short) i);
// 设置单元格内容为字符串型
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
// 为了能在单元格中输入中文,设置字符集为UTF_16
// cell.setEncoding(HSSFCell.ENCODING_UTF_16);
// 给单元格内容赋值
cell.setCellValue(new HSSFRichTextString(fieldName[i]));
// 初始化列宽
collength[i] = fieldName[i].getBytes().length;
}
// 临时单元格内容
String tempCellContent = "";
// 写入各条记录,每条记录对应excel表中的一行
for (int i = 0; i < data.size(); i++) {
Object[] tmp = data.get(i);
// 生成一行
row = sheet.createRow(i + 1);
for (int j = 0; j < tmp.length; j++) {
cell = row.createCell((short) j);
// 设置单元格字符类型为String
cell.setCellType(HSSFCell.CELL_TYPE_STRING);
tempCellContent = (tmp[j] == null) ? "" : tmp[j].toString();
cell.setCellValue(new HSSFRichTextString(tempCellContent));
// 如果自动调整列宽度。
if (autoColumnWidth) {
if (j >= collength.length) { // 标题列数小于数据列数时。
collength = CollectionUtil.addObjectToArray(collength,
tempCellContent.getBytes().length);
} else {
// 如果这个内容的宽度大于之前最大的，就按照这个设置宽度。
if (collength[j] < tempCellContent.getBytes().length) {
collength[j] = tempCellContent.getBytes().length;
}
}
}
}
}
// 自动调整列宽度。
if (autoColumnWidth) {
// 调整列为这列文字对应的最大宽度。
for (int i = 0; i < fieldName.length; i++) {
sheet.setColumnWidth(i, collength[i] * 2 * 256);
}
}
return workbook;
}
public void setAutoColumnWidth(boolean autoColumnWidth) {
this.autoColumnWidth = autoColumnWidth;
}
}
