POI 큰 excel 파일 가져오기
package me.shanzhi.test;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.poi.openxml4j.opc.OPCPackage;
import org.apache.poi.xssf.eventusermodel.XSSFReader;
import org.apache.poi.xssf.model.SharedStringsTable;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;
import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.helpers.XMLReaderFactory;
/**
* copy from apache.org
* depends on poi*.jar, dom4j.jar, stax-api.jar,xmlbeans.jar, xerecesImpl.jar
*/
@Scope("prototype")
@Component("excel07EventUserModel")
public class ExampleEventUserModel {
public void processOneSheet(String filename) throws Exception {
OPCPackage pkg = OPCPackage.open(filename);
XSSFReader r = new XSSFReader( pkg );
SharedStringsTable sst = r.getSharedStringsTable();
XMLReader parser = fetchSheetParser(sst);
// rId2 found by processing the Workbook
// Seems to either be rId# or rSheet#
InputStream sheet2 = r.getSheet("rId1");
InputSource sheetSource = new InputSource(sheet2);
parser.parse(sheetSource);
List<List<String>> sheetContent = ((SheetHandler) parser.getContentHandler()).retVal();
System.err.println(sheetContent.size());
for(List<String> list : sheetContent) {
System.out.println(list.get(7));
}
sheet2.close();
}
public void processAllSheets(String filename) throws Exception {
OPCPackage pkg = OPCPackage.open(filename);
XSSFReader r = new XSSFReader( pkg );
SharedStringsTable sst = r.getSharedStringsTable();
XMLReader parser = fetchSheetParser(sst);
Iterator<InputStream> sheets = r.getSheetsData();
while(sheets.hasNext()) {
System.out.println("Processing new sheet:
");
InputStream sheet = sheets.next();
InputSource sheetSource = new InputSource(sheet);
parser.parse(sheetSource);
sheet.close();
System.out.println("");
}
}
public XMLReader fetchSheetParser(SharedStringsTable sst) throws SAXException {
XMLReader parser =
XMLReaderFactory.createXMLReader(
"org.apache.xerces.parsers.SAXParser"
);
ContentHandler handler = new SheetHandler(sst);
parser.setContentHandler(handler);
return parser;
}
/**
* See org.xml.sax.helpers.DefaultHandler javadocs
*/
private static class SheetHandler extends DefaultHandler {
private SharedStringsTable sst;
private String lastContents;
private boolean nextIsString;
private List<String> row;
private List<List<String>> sheet = new ArrayList<List<String>>();
//
private int curCol = 0;
//
private int preCol = 0;
private SheetHandler(SharedStringsTable sst) {
this.sst = sst;
}
public List<List<String>> retVal() {
return sheet;
}
public void startElement(String uri, String localName, String name,
Attributes attributes) throws SAXException {
// c => cell
if(name.equals("sheetData")) sheet = new ArrayList<List<String>>();
if(name.equals("row")) row = new ArrayList<String>();
if(name.equals("c")) {
// Print the cell reference
//System.out.print(attributes.getValue("r") + " - ");
// Figure out if the value is an index in the SST
String cellType = attributes.getValue("t");
String rowStr = attributes.getValue("r");
curCol = getRowIndex(rowStr);
if(cellType != null && cellType.equals("s")) {
nextIsString = true;
} else {
nextIsString = false;
}
}
// Clear contents cache
lastContents = "";
}
public void endElement(String uri, String localName, String name)
throws SAXException {
// Process the last contents as required.
// Do now, as characters() may be called more than once
if(nextIsString) {
int idx = Integer.parseInt(lastContents);
lastContents = new XSSFRichTextString(sst.getEntryAt(idx)).toString();
nextIsString = false;
}
// v => contents of a cell
// Output after we've seen the string contents
if(name.equals("v")) {
//System.out.println(lastContents);
int cols = curCol-preCol;
if (cols>1){
for (int i = 0;i < cols-1;i++){
row.add(preCol,"");
}
}
row.add(curCol - 1 ,lastContents);
preCol = curCol;
}
if(name.equals("row")){
sheet.add(row);
curCol = 0;
preCol = 0;
}
}
public void characters(char[] ch, int start, int length)
throws SAXException {
lastContents += new String(ch, start, length);
}
// , c r , , ,
// AB45, (A-A+1)*26+(B-A+1)*26 ,45
public int getRowIndex(String rowStr){
rowStr = rowStr.replaceAll("[^A-Z]", "");
byte[] rowAbc = rowStr.getBytes();
int len = rowAbc.length;
float num = 0;
for (int i=0;i<len;i++){
num += (rowAbc[i]-'A'+1)*Math.pow(26,len-i-1 );
}
return (int) num;
}
}
public static void main(String[] args) throws Exception {
ExampleEventUserModel example = new ExampleEventUserModel();
example.processOneSheet("D:\\Users\\1 .xlsx");
}
}
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