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| package com.demo.util;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import org.apache.poi.POIXMLDocument;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
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.XSSFWorkbook;
import org.slf4j.LoggerFactory;
import ch.qos.logback.classic.Logger;
public class ExcelToEntityList {
private Logger log = (Logger) LoggerFactory.getLogger(this.getClass());
private BeanStorage storage = new BeanStorage();
private SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
private StringBuffer error = new StringBuffer(0);
public <T> ArrayList<T> transform(Class<?> entity,InputStream excel,Map<String,String> titleToAttr) throws IOException, ClassNotFoundException, InstantiationException, IllegalAccessException, InvalidFormatException{
ArrayList<T> result = new ArrayList<T>();
Workbook book = create(excel);
Sheet sheet = book.getSheetAt(0);
int rowCount = sheet.getLastRowNum();
if(rowCount < 1){
return result;
}
Map<Integer, String> headTitle = loadHeadTitle(sheet);
for(int i=1;i<=rowCount;i++){
Row row = sheet.getRow(i);
if(row==null){
continue;
}
int cellCount = row.getLastCellNum();
@SuppressWarnings("unchecked")
T instance = (T) entity.newInstance();
int col = 0;
try {
for(;col<cellCount;col++){
String cellValue = getCellValue(row.getCell(col));
if(null!=cellValue){
this.setEntity(entity, instance,titleToAttr.get(headTitle.get(col)), cellValue);
}
}
result.add(instance);
} catch (Exception e) {
e.printStackTrace();
this.error.append("第"+ (i+1) +"行，"+ headTitle.get(col)+"字段，数据错误，跳过！").append("<br>");
log.error("第"+ (i+1) +"行，"+ headTitle.get(col)+"字段，数据错误，跳过！");
}
}
excel.close();
return result;
}
private Map<Integer,String> loadHeadTitle(Sheet sheet){
Map<Integer,String> map = new HashMap<Integer, String>();
Row row = sheet.getRow(0);
int cellCount= row.getLastCellNum();
for(int i = 0; i < cellCount; i++){
String value = row.getCell(i).getStringCellValue();
if(null == value){
throw new RuntimeException("Excel导入：标题栏不能为空！");
}
map.put(i, value);
}
return map;
}
private String getCellValue(Cell cell){
if(null==cell){return "";}
String value = null;
switch (cell.getCellType()){
case XSSFCell.CELL_TYPE_BOOLEAN:
value = String.valueOf(cell.getBooleanCellValue());
break;
case XSSFCell.CELL_TYPE_NUMERIC:
if (DateUtil.isCellDateFormatted(cell)){
value = dateFormat.format(cell.getDateCellValue());
}else{
value = String.valueOf((long) cell.getNumericCellValue());
}
break;
case XSSFCell.CELL_TYPE_STRING:
value = cell.getStringCellValue();
break;
case XSSFCell.CELL_TYPE_FORMULA:
log.debug("不支持函数！");
break;
}
return value;
}
private <T> void setEntity(Class<?> clazz, T instance, String pro, String value) throws SecurityException, NoSuchMethodException, Exception{
String innerPro = null;
String outterPro = null;
if (pro.contains(".")){
String[] pros = pro.split("\\.");
outterPro = pros[0];
innerPro = pros[1];
storage.storeClass(instance.hashCode() + outterPro, clazz.getDeclaredMethod(this.initGetMethod(outterPro), null).getReturnType());
}
String getMethod = this.initGetMethod(outterPro!=null?outterPro:pro);
Class<?> type = clazz.getDeclaredMethod(getMethod, null).getReturnType();
Method method = clazz.getMethod(this.initSetMethod(outterPro!=null?outterPro:pro), type);
if (type == String.class){
method.invoke(instance, value);
}else if (type == int.class || type == Integer.class){
method.invoke(instance, Integer.parseInt("".equals(value) ? "0" : value));
}else if (type == long.class || type == Long.class){
method.invoke(instance, Long.parseLong("".equals(value) ? "0" : value));
}else if (type == float.class || type == Float.class){
method.invoke(instance, Float.parseFloat("".equals(value) ? "0" : value));
}else if (type == double.class || type == Double.class){
method.invoke(instance, Double.parseDouble("".equals(value) ? "0" : value));
}else if (type == Date.class){
method.invoke(instance, dateFormat.parse(value));
}else if (type == boolean.class|| type == Boolean.class){
method.invoke(instance, Boolean.parseBoolean("".equals(value) ? "false" : value));
}else if (type == byte.class|| type == Byte.class){
method.invoke(instance, Byte.parseByte(value));
}else{
Object ins = storage.getInstance(instance.hashCode() + outterPro);
this.setEntity(ins.getClass(), ins, innerPro, value);
method.invoke(instance, ins);
}
}
public String initSetMethod(String field)
{
return "set" + field.substring(0, 1).toUpperCase() + field.substring(1);
}
public String initGetMethod(String field)
{
return "get" + field.substring(0, 1).toUpperCase() + field.substring(1);
}
public boolean hasError()
{
return error.capacity() > 0;
}
public StringBuffer getError()
{
return error;
}
private class BeanStorage
{
private Map<String, Object> instances = new HashMap<String, Object>();
public void storeClass(String key, Class<?> clazz) throws Exception{
if (!instances.containsKey(key)){
instances.put(key, clazz.newInstance());
}
}
public Object getInstance(String key){
return instances.get(key);
}
}
public Workbook create(InputStream inp) throws IOException,InvalidFormatException {
if (!inp.markSupported()) {
inp = new PushbackInputStream(inp, 8);
}
if (POIFSFileSystem.hasPOIFSHeader(inp)) {
return new HSSFWorkbook(inp);
}
if (POIXMLDocument.hasOOXMLHeader(inp)) {
return new XSSFWorkbook(OPCPackage.open(inp));
}
throw new IllegalArgumentException("你的excel版本目前poi解析不了");
}
}
|
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