本身寫的一個Excel操做類 還有不足之處求指導
package util;
import java.beans.IntrospectionException;
import java.beans.PropertyDescriptor;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
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;
import demo.domain.User;
public class ExcelBase {
/***
* public List getExcelData(String fileName,Class clazz) throws Exception {
* List list = readExcel(clazz, fileName,0); return list; }
*/
public List[] getExcelData(String fileName, Class... clazzs)
throws Exception {
List[] lists = null;
if (clazzs != null) {
lists = new List[clazzs.length];
for (int i = 0; i < lists.length; i++) {
lists[i] = readExcel(clazzs[i], fileName, 0);
}
}
return lists;
}
/***
* public Map<String, List> getExcelData(Class[] clazzs, String fileName)
* throws Exception { Map<String, List> map = new HashMap<String, List>();
* for(int i = 0;i < clazzs.length;i++){ List list = readExcel(clazzs[i],
* fileName,i); map.put(clazzs[i].getName(), list); } return map; }
*/
public List readExcel(Class clazz, String fileName, int sheetIndex)
throws Exception {
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(
new File(fileName)));
// 打開HSSFWorkbook
POIFSFileSystem fs = new POIFSFileSystem(bis);
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(sheetIndex);
List list = new ArrayList();
// 獲取標題
HSSFRow titelRow = sheet.getRow(0);
Map<Integer, String> titel = new HashMap<Integer, String>();
for (int columnIndex = 0; columnIndex < titelRow.getLastCellNum(); columnIndex++) {
HSSFCell cell = titelRow.getCell(columnIndex);
if (cell != null) {
String value = cell.getStringCellValue();
titel.put(Integer.valueOf(columnIndex), value);
}
}
// 獲取值
for (int rowIndex = 1; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
HSSFRow row = sheet.getRow(rowIndex);
Object obj = clazz.newInstance();
for (int columnIndex = 0; columnIndex <= row.getLastCellNum(); columnIndex++) {
HSSFCell cell = row.getCell(columnIndex);
if (cell != null) {
/**
* Object value = null; // 值 Class[] fType = { String.class
* }; // 注意：必定要設成這個，不然可能會出現亂碼 //
* cell.setEncoding(HSSFCell.ENCODING_UTF_16);
* System.out.println(cell.getCellType()); switch
* (cell.getCellType()) { case HSSFCell.CELL_TYPE_STRING:
* value = cell.getStringCellValue(); break; case
* HSSFCell.CELL_TYPE_NUMERIC: if
* (HSSFDateUtil.isCellDateFormatted(cell)) { value =
* cell.getDateCellValue(); fType[0] = Date.class; } else {
* value = Integer.valueOf((int)cell.getNumericCellValue());
* fType[0] = Integer.class; } break; case
* HSSFCell.CELL_TYPE_FORMULA: // 導入時若是爲公式生成的數據則無值 if
* (!cell.getStringCellValue().equals("")) { value =
* cell.getStringCellValue(); } else { value =
* cell.getNumericCellValue(); } break; case
* HSSFCell.CELL_TYPE_BLANK: break; case
* HSSFCell.CELL_TYPE_ERROR: value = null; break; case
* HSSFCell.CELL_TYPE_BOOLEAN: value =
* (cell.getBooleanCellValue() == true ? "Y" : "N"); break;
* default: value = ""; }
*/
// 最初想法
// 注意：必定要設成這個，不然可能會出現亂碼
// cell.setEncoding(HSSFCell.ENCODING_UTF_16);
String value = null;
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:
// 導入時若是爲公式生成的數據則無值
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 = "";
}
Method method = clazz.getMethod("set"
+ toUpperFirstCase(titel.get(Integer
.valueOf(columnIndex))), String.class);
method.invoke(obj, value);
}
}
list.add(obj);
}
return list;
}
/**
* @author popl @ 首字母大寫
*/
public String toUpperFirstCase(String str) {
return str.replaceFirst(str.substring(0, 1), str.substring(0, 1)
.toUpperCase());
}
/**
* 寫文件
*
* @throws Exception
*/
public void createExcelFile(String fileName, List... lists)
throws Exception {
// 第一步，建立一個webbook，對應一個Excel文件
HSSFWorkbook wb = new HSSFWorkbook();
// 第二步，在webbook中添加一個sheet,對應Excel文件中的sheet
if (lists != null) {
Class clazz = lists[0].get(0).getClass();
Field[] fields = clazz.getDeclaredFields();
HSSFSheet sheet = wb.createSheet(clazz.getCanonicalName());
// 第三步，在sheet中添加表頭第0行
HSSFRow rowTitle = sheet.createRow(0);
// 第四步，建立單元格，並設置值表頭 設置表頭居中
HSSFCellStyle style = wb.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 建立一個居中格式
for (int clolumnIndex = 0; clolumnIndex < fields.length; clolumnIndex++) {
HSSFCell cell = rowTitle.createCell(clolumnIndex);
cell.setCellValue(fields[clolumnIndex].getName());
cell.setCellStyle(style);
}
for (List list : lists) {
// 數據
Method[] mds = getGetMethod(clazz);
for (int rowIndex = 0; rowIndex < list.size(); rowIndex++) {
HSSFRow row = sheet.createRow(rowIndex + 1);
for (int clolumnIndex = 0; clolumnIndex < fields.length; clolumnIndex++) {
HSSFCell cell = row.createCell(clolumnIndex);
Object obj = mds[clolumnIndex].invoke(list
.get(rowIndex));
if (obj != null) {
if(obj instanceof Date){
// obj = new SimpleDateFormat("yyyy-MM-dd").format((Date)obj);
cell.setCellValue(new SimpleDateFormat("yyyy-MM-dd").format((Date)obj));
}
else if(obj instanceof Integer || obj instanceof Double || obj instanceof Float || obj instanceof Long){
cell.setCellValue(Double.parseDouble(obj.toString()));
}else if(obj instanceof Boolean ){
cell.setCellValue((Boolean)obj);
}else{
cell.setCellValue(obj.toString());
}
cell.setCellStyle(style);
}
}
}
}
FileOutputStream fout = new FileOutputStream(fileName);
wb.write(fout);
fout.close();
}
}
public Method[] getGetMethod(Class clazz) throws Exception {
Field[] fields = clazz.getDeclaredFields();
Method[] methods = new Method[fields.clone().length];
for (int i = 0; i < fields.length; i++) {
PropertyDescriptor pd = new PropertyDescriptor(fields[i].getName(), clazz);
methods[i] = pd.getReadMethod();
}
return methods;
}
public static void main(String[] arg) throws Exception {
List[] lists = new ExcelBase().getExcelData("D:/temp/123.xls",
User.class);
for (List list : lists) {
for (int i = 0; i < list.size(); i++) {
User user = (User) list.get(i);
System.out.println(user.getId() + "\t" + user.getName() + "\t"
+ user.getBirthday() + "\t" + user.getAge() + "\t"
+ user.getSex() + "\t" + user.getEmail() + "\t");
}
}
new ExcelBase().createExcelFile("E:/test/user.xls", lists);
}
}
新手寫代碼，求大神指點，我認爲應該有不少不足，但願幫我指出java
找到一個能夠彌補一點不足之處的方法了web
在得到屬性名稱的時候把他反射成Field，得到Field的type再經過逐一判斷，這樣可以實現基本類型的的set了
數據庫
public List readExcel(Class clazz, String fileName, int sheetIndex)
throws Exception {
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(
new File(fileName)));
// 打開HSSFWorkbook
POIFSFileSystem fs = new POIFSFileSystem(bis);
HSSFWorkbook wb = new HSSFWorkbook(fs);
HSSFSheet sheet = wb.getSheetAt(sheetIndex);
List list = new ArrayList();
// 獲取標題
HSSFRow titelRow = sheet.getRow(0);
Map<Integer, String> titel = new HashMap<Integer, String>();
for (int columnIndex = 0; columnIndex < titelRow.getLastCellNum(); columnIndex++) {
HSSFCell cell = titelRow.getCell(columnIndex);
if (cell != null) {
String value = cell.getStringCellValue();
titel.put(Integer.valueOf(columnIndex), value);
}
}
// 獲取值
for (int rowIndex = 1; rowIndex <= sheet.getLastRowNum(); rowIndex++) {
HSSFRow row = sheet.getRow(rowIndex);
Object obj = clazz.newInstance();
for (int columnIndex = 0; columnIndex <= row.getLastCellNum(); columnIndex++) {
HSSFCell cell = row.getCell(columnIndex);
if (cell != null) {
String value = null;
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:
// 導入時若是爲公式生成的數據則無值
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 = "";
}
Field field = clazz.getDeclaredField(titel.get(Integer.valueOf(columnIndex)));
Class fieldType = field.getType();
Object agge = null;
if(fieldType.isAssignableFrom(Integer.class)){
agge = Integer.valueOf(value);
}else if(fieldType.isAssignableFrom(Double.class)){
agge = Double.valueOf(value);
}else if(fieldType.isAssignableFrom(Float.class)){
agge = Float.valueOf(value);
}else if(fieldType.isAssignableFrom(Long.class)){
agge = Long.valueOf(value);
}else if(fieldType.isAssignableFrom(Date.class)){
agge = new SimpleDateFormat("yyyy-MM-dd").parse(value);
}else if(fieldType.isAssignableFrom(Boolean.class)){
agge = "Y".equals(value) || "1".equals(value);
}else if(fieldType.isAssignableFrom(String.class)){
agge = value;
}
//我的感受char跟byte就不用判斷了 用這兩個類型的不多若是是從數據庫用IDE生成的話就不會出現了
Method method = clazz.getMethod("set"
+ toUpperFirstCase(titel.get(Integer
.valueOf(columnIndex))), fieldType);
method.invoke(obj, agge);
}
}
list.add(obj);
}
return list;
}
其實toUpperFirstCase方法應經能夠去掉了 跟讀的那種方法同樣用屬性的write方法apache
不知道該的有什麼卻陷沒，求幫忙指點下dom
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