Java POI 操作excel 无硬编码，反射，史上最牛

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import net.sf.json.JSONObject;

import org.apache.commons.collections.map.ListOrderedMap;
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.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.apache.poi2.hssf.usermodel.HSSFCell;
import org.apache.poi2.hssf.usermodel.HSSFRow;
import org.apache.poi2.hssf.usermodel.HSSFSheet;
import org.apache.poi2.hssf.usermodel.HSSFWorkbook;

/**
* Excel工具类，没有硬编码，修改时不要添加硬编码代码
* @author WSF
*
*/
@SuppressWarnings("unchecked")
public class ExcelUtil {

private ExcelUtil(){};
private static List<String> columns;//要解析excel中的列名
private static int sheetNum = 0;//要解析的sheet下标
private static boolean dynamicColumn = false;//是否
private static Map<String, String> dynamicMapConfig = new ListOrderedMap();//動態列配置文件
/**
* poi读取excle
* @return
*/
public static String readExcel(File file) throws Exception{
StringBuilder retJson = new StringBuilder();
InputStream inStream = null;
try {
inStream = new FileInputStream(file);
HSSFWorkbook workbook = new HSSFWorkbook(inStream);
HSSFSheet sheet = workbook.getSheetAt(sheetNum);//获得表
int lastRowNum = sheet.getLastRowNum();//最后一行
retJson.append("[");
for(int i = 0 ;i < lastRowNum;i++){
HSSFRow row = sheet.getRow(i+1);//获得行
String rowJson = readExcelRow(row);
retJson.append(rowJson);
if(i<lastRowNum-1)
retJson.append(",");
}
retJson.append("]");
} catch (Exception e) {
try {
inStream = new FileInputStream(file);
XSSFWorkbook workbook = new XSSFWorkbook(inStream);
XSSFSheet sheet = workbook.getSheetAt(sheetNum);
int lastRowNum = sheet.getLastRowNum();//最后一行
retJson.append("[");
for(int i = 0 ;i < lastRowNum;i++){
XSSFRow row = sheet.getRow(i+1);//获得行
String rowJson = readExcelRow(row);
retJson.append(rowJson);
if(i<lastRowNum-1)
retJson.append(",");
}
retJson.append("]");
} catch (IOException e1) {
e1.printStackTrace();
throw e1;
}
}finally{
close(null,inStream);
}
return retJson.toString();
}
/**
* poi读取excle 生成实体集合
* @param <E>
* @return
*/
public static <E> List<E> readExcel(File file,Class<E> clazz) throws Exception{
if(columns==null){
setColumns(clazz);
}
InputStream inStream = null;
List<E> eList = new ArrayList<E>();
try {
inStream = new FileInputStream(file);
HSSFWorkbook workbook = new HSSFWorkbook(inStream);
HSSFSheet sheet = workbook.getSheetAt(sheetNum);//获得表
int lastRowNum = sheet.getLastRowNum();//最后一行
if(dynamicColumn){
//动态列處理
HSSFRow header = sheet.getRow(0);//表頭
List<String> rList = readRow(header);
setDynamicColumn(rList);
}
for(int i = 0 ;i < lastRowNum;i++){
HSSFRow row = sheet.getRow(i+1);//获得行
String rowJson = readExcelRow(row);
E _e = json2Bean(rowJson,clazz);
eList.add(_e);
}
} catch (Exception e) {
try {
inStream = new FileInputStream(file);
XSSFWorkbook workbook = new XSSFWorkbook(inStream);
XSSFSheet sheet = workbook.getSheetAt(sheetNum);
int lastRowNum = sheet.getLastRowNum();//最后一行
if(dynamicColumn){
//动态列處理
XSSFRow header = sheet.getRow(0);
List<String> rList = readRow(header);
setDynamicColumn(rList);
}
for(int i = 0 ;i < lastRowNum;i++){
XSSFRow row = sheet.getRow(i+1);//获得行
String rowJson = readExcelRow(row);
E _e = json2Bean(rowJson,clazz);
eList.add(_e);
}
} catch (Exception e1) {
e1.printStackTrace();
throw e1;
}
}finally{
close(null,inStream);
}
return eList;
}
/**
* 动态列配置
*/
private static void setDynamicColumn(List<String> headlist) throws Exception{
List<String> tempcolumns = new ArrayList<String>();
for (Iterator<String> iterator = headlist.iterator();iterator.hasNext();) {
String value = iterator.next();
value = value.replace("（", "(");
value = value.replace("）", ")");
value = value.trim();
String key = findKey(value);
if(key==null){
throw new RuntimeException("请上传合法excle！");
}
tempcolumns.add(findKey(value));
}
setColumns(tempcolumns);//重新设置column
}
/**
* 根据value动态找到key值
* @return
*/
private static String findKey(String value){
for(Map.Entry<String,String> entryconfig:dynamicMapConfig.entrySet()){
String keyc = entryconfig.getKey();
String valc = entryconfig.getValue();
if(valc.equals(value)){
return keyc;
}
}
return null;
}
/**
* poi读取excle 生成实体集合
* @param file
* @param clazz
* @param exceptscolumns
* @return
*/
public static <E> List<E> readExcel(File file,Class<E> clazz,String[] exceptscolumns) throws Exception{
setColumns(clazz,exceptscolumns);
return readExcel(file, clazz);
}
/**
* 读取excle多个sheet到多个对象（对象的顺序固定）
* @param file
* @param clazz
* @return
*/
public static <E> List<List<E>> readExcel(File file,Class<E>[] clazz) throws Exception{
List<List<E>> eliLists = new ArrayList<List<E>>();//[clazz.length];
int i = 0;
for(Class<E> cls:clazz){
setColumns(null,null);
setSheetNum(i++);
List<E> eList = readExcel(file, cls);
eliLists.add(eList);
}
return eliLists;
}
/**
* 将json转换为Bean实例
* @param <E>
* @return
*/
private static <E> E json2Bean(String json,Class<E> clazz) throws Exception{
JSONObject jsonObj = JSONObject.fromObject(json);
Method[] methods = clazz.getDeclaredMethods();
try {
E _e = clazz.newInstance();
for(Method m:methods){
String name = m.getName();
if(name.startsWith("set")){
String keyPrev = name.substring(3,4).toLowerCase();
String keyNext = name.substring(4);
String val = "";
try {
val = jsonObj.getString(keyPrev+keyNext);
} catch (Exception e) {
val = "";
}
m.invoke(_e, val);
}
}
return _e;
} catch (Exception e) {
e.printStackTrace();
throw e;
}
}
/**
* 读取行值
* @return
*/
private static String readExcelRow(HSSFRow row){
StringBuilder rowJson = new StringBuilder();
int lastCellNum = ExcelUtil.columns.size();//最后一个单元格
rowJson.append("{");
for(int i = 0 ;i<lastCellNum;i++){
HSSFCell cell = row.getCell(i);
String cellVal = readCellValue(cell);
rowJson.append(toJsonItem(columns.get(i), cellVal));
if(i<lastCellNum-1)
rowJson.append(",");
}
rowJson.append("}");
return rowJson.toString();
}
/**
* 读取行值
* @return
*/
private static String readExcelRow(XSSFRow row){
StringBuilder rowJson = new StringBuilder();
int lastCellNum = ExcelUtil.columns.size();//最后一个单元格
rowJson.append("{");
for(int i = 0 ;i<lastCellNum;i++){
XSSFCell cell = row.getCell(i);
String cellVal = readCellValue(cell);
rowJson.append(toJsonItem(columns.get(i), cellVal));
if(i<lastCellNum-1)
rowJson.append(",");
}
rowJson.append("}");
return rowJson.toString();
}

/**
* 读取行生称list
* @return
*/
private static List<String> readRow(XSSFRow row){
List<String> ret = new ArrayList<String>();
int cellcount = row.getLastCellNum();
for(int i = 0 ;i < cellcount;i++){
XSSFCell cell = row.getCell(i);
String cellval = readCellValue(cell);
if(cellval.trim().length()>0){
ret.add(cellval);
}
}
return ret;
}
/**
* 读取行生称list
* @return
*/
private static List<String> readRow(HSSFRow row){
List<String> ret = new ArrayList<String>();
int cellcount = row.getLastCellNum();
for(int i = 0 ;i < cellcount;i++){
HSSFCell cell = row.getCell(i);
String cellval = readCellValue(cell);
if(cellval.trim().length()>0){
ret.add(cellval);
}
}
return ret;
}

/**
* 读取单元格的值
* @param hssfCell
* @return
*/
@SuppressWarnings("static-access")
private static String readCellValue(HSSFCell hssfCell) {
if (hssfCell.getCellType() == hssfCell.CELL_TYPE_BOOLEAN) {
return String.valueOf(hssfCell.getBooleanCellValue());
} else if (hssfCell.getCellType() == hssfCell.CELL_TYPE_NUMERIC) {
short format = hssfCell.getCellStyle().getDataFormat();
SimpleDateFormat sdf = null;
String str_temp = "";
if(format == 14 || format == 31 || format == 57 || format == 58){
//日期
sdf = new SimpleDateFormat("yyyy/MM/dd");
double value = hssfCell.getNumericCellValue();
Date date = DateUtil.getJavaDate(value);
str_temp = sdf.format(date);
}else if(format == 10) {
//百分比
str_temp = hssfCell.getNumericCellValue()+"";
}else {
hssfCell.setCellType(1);//设置为String
str_temp = String.valueOf(hssfCell.getRichStringCellValue());//得到值
}
return str_temp;
}else if(hssfCell.getCellType() == hssfCell.CELL_TYPE_FORMULA){
int val = hssfCell.getCachedFormulaResultType();
return val+"";
} else {
return String.valueOf(hssfCell.getRichStringCellValue());
}
}
/**
* 读取单元格的值
* @param hssfCell
* @return
*/
@SuppressWarnings("static-access")
private static String readCellValue(XSSFCell sssfCell) {
if (sssfCell.getCellType() == sssfCell.CELL_TYPE_BOOLEAN) {
return String.valueOf(sssfCell.getBooleanCellValue());
} else if (sssfCell.getCellType() == sssfCell.CELL_TYPE_NUMERIC) {
short format = sssfCell.getCellStyle().getDataFormat();
SimpleDateFormat sdf = null;
String str_temp = "";
if(format == 14 || format == 31 || format == 57 || format == 58){
//日期
sdf = new SimpleDateFormat("yyyy/MM/dd");
double value = sssfCell.getNumericCellValue();
Date date = DateUtil.getJavaDate(value);
str_temp = sdf.format(date);
}else if(format == 10) {
//百分比
str_temp = sssfCell.getNumericCellValue()+"";
}else {
sssfCell.setCellType(1);//设置为String
str_temp = String.valueOf(sssfCell.getRichStringCellValue());//得到值
}
return str_temp;
}else if(sssfCell.getCellType() == sssfCell.CELL_TYPE_FORMULA){
int val = sssfCell.getCachedFormulaResultType();
return val+"";
}else {
return String.valueOf(sssfCell.getRichStringCellValue());
}
}
/**
* 转换为json对
* @return
*/
private static String toJsonItem(String name,String val){
return "\""+name+"\":\""+val+"\"";
}
/**
* 关闭io流
* @param fos
* @param fis
*/
private static void close(OutputStream out, InputStream in) {
if (in != null) {
try {
in.close();
} catch (IOException e) {
System.out.println("InputStream关闭失败");
e.printStackTrace();
}
}
if (out != null) {
try {
out.close();
} catch (IOException e) {
System.out.println("OutputStream关闭失败");
e.printStackTrace();
}
}
}
/**
* 填出数据到excel book中
* @param book
* @param data
* @param sheetname
* @param titles
* @param columns
*/
public static void data2Book(Workbook book,List<? extends Object> data,String sheetname,String[] titles,String[] columns) throws Exception{
Sheet sheet = book.createSheet(sheetname);
Row th = sheet.createRow((short)0);//标题行
for(int i = 0 ;i <titles.length;i++){
Cell cell = th.createCell(i);
cell.setCellValue(titles[i]);
}
Object _d = data.get(0);
if(_d instanceof Map){
//Map集合
for (int j = 0;j<data.size();j++) {
Map _dm = (Map)data.get(j);
Row tr = sheet.createRow((short)(j+1));//内容行
for(int k = 0 ;k <columns.length;k++){
Cell cell = tr.createCell(k);
Object val = _dm.get(columns[k]);
String value = val==null?"":val.toString();
cell.setCellValue(value);
}

}
}else {
//Bean集合
for (int j = 0;j<data.size();j++) {
Object _do = data.get(j);
Row tr = sheet.createRow((short)(j+1));//内容行
for(int k = 0 ;k <columns.length;k++){
String column = columns[k];
Method method = getTargetGetMethod(_do, column);//获取目标方法
try {
Cell cell = tr.createCell(k);
Object val = method.invoke(_do);
String value = val==null?"":val.toString();
value = value.replace("00:00:00.0","");//处理时间中非法字符
cell.setCellValue(value);
} catch (Exception e) {
e.printStackTrace();
throw e;
}
}

}
}
}
/**
* 获取bean的指定getter方法
* @param o
* @param name
* @return
*/
private static Method getTargetGetMethod(Object o,String name) throws Exception{
try {
String mname = "get"+name.substring(0,1).toUpperCase()+name.substring(1);
return o.getClass().getMethod(mname);
} catch (Exception e) {
e.printStackTrace();
throw e;
}
}
/**
* 将bean所有属性放入map中
*/
private static <E> void beanProp2List(Class<E> clazz,List<String> excepts){
Field[] fields = clazz.getDeclaredFields();
columns = new ArrayList<String>();//顺序固定可重复
for (int i = 0; i < fields.length; i++) {
Field field = fields[i];
String fieldName = field.getName();
if(excepts!=null&&excepts.contains(fieldName))continue;
columns.add(fieldName);
}
}

public static List<String> getColumns() {
return ExcelUtil.columns;
}
public static void setColumns(List<String> columns) {
ExcelUtil.columns = columns;
}
public static void setColumns(Class<?> clazz){
beanProp2List(clazz,null);
}
/**
* 设置列，不包括excepts指定的字段
* @param clazz
* @param excepts
*/
public static void setColumns(Class<?> clazz,String[] excepts){
beanProp2List(clazz,Arrays.asList(excepts));
}
public static int getSheetNum() {
return sheetNum;
}
public static void setSheetNum(int sheetNum) {
ExcelUtil.sheetNum = sheetNum;
}
public static boolean isDynamicColumn() {
return dynamicColumn;
}
public static void setDynamicColumn(boolean dynamicColumn) {
ExcelUtil.dynamicColumn = dynamicColumn;
}
public static Map<String, String> getDynamicMapConfig() {
return dynamicMapConfig;
}
public static void setDynamicMapConfig(Map<String, String> dynamicMapConfig) {
ExcelUtil.dynamicMapConfig = dynamicMapConfig;
}

}
http://javasam.iteye.com/blog/2191403