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package com.jeeplus.common.utils.excel;

import java.io.File;

import java.io.IOException;

import java.io.InputStream;

import java.io.PrintStream;

import java.text.SimpleDateFormat;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

import javax.xml.parsers.ParserConfigurationException;

import javax.xml.parsers.SAXParser;

import javax.xml.parsers.SAXParserFactory;

import org.apache.commons.fileupload.disk.DiskFileItem;

import org.apache.poi.hssf.usermodel.HSSFDateUtil;

import org.apache.poi.openxml4j.exceptions.OpenXML4JException;

import org.apache.poi.openxml4j.opc.OPCPackage;

import org.apache.poi.openxml4j.opc.PackageAccess;

import org.apache.poi.ss.usermodel.BuiltinFormats;

import org.apache.poi.ss.usermodel.DataFormatter;

import org.apache.poi.xssf.eventusermodel.ReadOnlySharedStringsTable;

import org.apache.poi.xssf.eventusermodel.XSSFReader;

import org.apache.poi.xssf.model.StylesTable;

import org.apache.poi.xssf.usermodel.XSSFCellStyle;

import org.apache.poi.xssf.usermodel.XSSFRichTextString;

import org.springframework.web.multipart.MultipartFile;

import org.springframework.web.multipart.commons.CommonsMultipartFile;

import org.xml.sax.Attributes;

import org.xml.sax.InputSource;

import org.xml.sax.SAXException;

import org.xml.sax.XMLReader;

import org.xml.sax.helpers.DefaultHandler;

import com.jeeplus.modules.eventcompany.entity.Busscompany;

/**

* 使用CVS模式解决XLSX文件，可以有效解决用户模式内存溢出的问题

* 该模式是POI官方推荐的读取大数据的模式，在用户模式下，数据量较大、Sheet较多、或者是有很多无用的空行的情况

* ，容易出现内存溢出,用户模式读取Excel的典型代码如下： FileInputStream file=new

* FileInputStream(“c:\test.xlsx”); Workbook wb=new XSSFWorkbook(file);

*/

public class XLSXCovertCSVReader {

/**

* The type of the data value is indicated by an attribute on the cell. The

* value is usually in a “v” element within the cell.

*/

enum xssfDataType {

BOOL, ERROR, FORMULA, INLINESTR, SSTINDEX, NUMBER,

}

/**
* 使用xssf_sax_API处理Excel,请参考： http://poi.apache.org/spreadsheet/how-to.html#xssf_sax_api * <p/>
* Also see Standard ECMA-376, 1st edition, part 4, pages 1928ff, at
* http://www.ecma-international.org/publications/standards/Ecma-376.htm * <p/>
* A web-friendly version is http://openiso.org/Ecma/376/Part4 */
class MyXSSFSheetHandler extends DefaultHandler {
/**
* Table with styles
*/
private StylesTable stylesTable;
/**
* Table with unique strings
*/
private ReadOnlySharedStringsTable sharedStringsTable;
/**
* Destination for data
*/
private final PrintStream output;
/**
* Number of columns to read starting with leftmost
*/
private final int minColumnCount;
// Set when V start element is seen
private boolean vIsOpen;
// Set when cell start element is seen;
// used when cell close element is seen.
private xssfDataType nextDataType;

// Used to format numeric cell values.
private short formatIndex;
private String formatString;
private final DataFormatter formatter;

private int thisColumn = -1;
// The last column printed to the output stream
private int lastColumnNumber = -1;

// Gathers characters as they are seen.
private StringBuffer value;
private String[] record;
private List<String[]> rows = new ArrayList<String[]>();
private boolean isCellNull = false;
/**
* Accepts objects needed while parsing.
*
* @param styles
*            Table of styles
* @param strings
*            Table of shared strings
* @param cols
*            Minimum number of columns to show
* @param target
*            Sink for output
*/
public MyXSSFSheetHandler(StylesTable styles,
ReadOnlySharedStringsTable strings, int cols, PrintStream target) {
this.stylesTable = styles;
this.sharedStringsTable = strings;
this.minColumnCount = cols;
this.output = target;
this.value = new StringBuffer();
this.nextDataType = xssfDataType.NUMBER;
this.formatter = new DataFormatter();
record = new String[this.minColumnCount];
rows.clear();// 每次读取都清空行集合
}

/*
* (non-Javadoc)
* @see
* org.xml.sax.helpers.DefaultHandler#startElement(java.lang.String,
* java.lang.String, java.lang.String, org.xml.sax.Attributes)
*/
public void startElement(String uri, String localName, String name,
Attributes attributes) throws SAXException {

if ("inlineStr".equals(name) || "v".equals(name)) {
vIsOpen = true;
// Clear contents cache
value.setLength(0);
}
// c => cell
else if ("c".equals(name)) {
// Get the cell reference
String r = attributes.getValue("r");
int firstDigit = -1;
for (int c = 0; c < r.length(); ++c) {
if (Character.isDigit(r.charAt(c))) {
firstDigit = c;
break;
}
}
thisColumn = nameToColumn(r.substring(0, firstDigit));

// Set up defaults.
this.nextDataType = xssfDataType.NUMBER;
this.formatIndex = -1;
this.formatString = null;
String cellType = attributes.getValue("t");
String cellStyleStr = attributes.getValue("s");
if ("b".equals(cellType))
nextDataType = xssfDataType.BOOL;
else if ("e".equals(cellType))
nextDataType = xssfDataType.ERROR;
else if ("inlineStr".equals(cellType))
nextDataType = xssfDataType.INLINESTR;
else if ("s".equals(cellType))
nextDataType = xssfDataType.SSTINDEX;
else if ("str".equals(cellType))
nextDataType = xssfDataType.FORMULA;
else if (cellStyleStr != null) {
// It's a number, but almost certainly one
// with a special style or format
int styleIndex = Integer.parseInt(cellStyleStr);
XSSFCellStyle style = stylesTable.getStyleAt(styleIndex);
this.formatIndex = style.getDataFormat();
this.formatString = style.getDataFormatString();
if (this.formatString == null)
this.formatString = BuiltinFormats
.getBuiltinFormat(this.formatIndex);
}
}
}

/*
* (non-Javadoc)
* @see org.xml.sax.helpers.DefaultHandler#endElement(java.lang.String,
* java.lang.String, java.lang.String)
*/
public void endElement(String uri, String localName, String name)
throws SAXException {

String thisStr = null;
// v => contents of a cell
if ("v".equals(name)) {
// Process the value contents as required.
// Do now, as characters() may be called more than once
switch (nextDataType) {

case BOOL:
char first = value.charAt(0);
thisStr = first == '0' ? "FALSE" : "TRUE";
break;

case ERROR:
thisStr = "\"ERROR:" + value.toString() + '"';
break;

case FORMULA:
// A formula could result in a string value,
// so always add double-quote characters.
thisStr = '"' + value.toString() + '"';
break;

case INLINESTR:
// TODO: have seen an example of this, so it's untested.
XSSFRichTextString rtsi = new XSSFRichTextString(
value.toString());
thisStr = '"' + rtsi.toString() + '"';
break;

case SSTINDEX:
String sstIndex = value.toString();
try {
int idx = Integer.parseInt(sstIndex);
XSSFRichTextString rtss = new XSSFRichTextString(
sharedStringsTable.getEntryAt(idx));
thisStr = '"' + rtss.toString() + '"';
} catch (NumberFormatException ex) {
output.println("Failed to parse SST index '" + sstIndex
+ "': " + ex.toString());
}
break;

case NUMBER:
String n = value.toString();
// 判断是否是日期格式
if (HSSFDateUtil.isADateFormat(this.formatIndex, n)) {
Double d = Double.parseDouble(n);
Date date=HSSFDateUtil.getJavaDate(d);
thisStr=formateDateToString(date);
} else if (this.formatString != null)
thisStr = formatter.formatRawCellContents(
Double.parseDouble(n), this.formatIndex,
this.formatString);
else
thisStr = n;
break;

default:
thisStr = "(TODO: Unexpected type: " + nextDataType + ")";
break;
}

// Output after we've seen the string contents
// Emit commas for any fields that were missing on this row
if (lastColumnNumber == -1) {
lastColumnNumber = 0;
}
//判断单元格的值是否为空
if (thisStr == null || "".equals(isCellNull)) {
isCellNull = true;// 设置单元格是否为空值
}
record[thisColumn] = thisStr;
// Update column
if (thisColumn > -1)
lastColumnNumber = thisColumn;

} else if ("row".equals(name)) {

// Print out any missing commas if needed
if (minColumns > 0) {
// Columns are 0 based
if (lastColumnNumber == -1) {
lastColumnNumber = 0;
}
if (isCellNull == false && record[0] != null
&& record[1] != null)// 判断是否空行
{
rows.add(record.clone());
isCellNull = false;
for (int i = 0; i < record.length; i++) {
record[i] = null;
}
}
}
lastColumnNumber = -1;
}
}

public List<String[]> getRows() {
return rows;
}

public void setRows(List<String[]> rows) {
this.rows = rows;
}

/**
* Captures characters only if a suitable element is open. Originally
* was just "v"; extended for inlineStr also.
*/
public void characters(char[] ch, int start, int length)
throws SAXException {
if (vIsOpen)
value.append(ch, start, length);
}

/**
* Converts an Excel column name like "C" to a zero-based index.
*
* @param name
* @return Index corresponding to the specified name
*/
private int nameToColumn(String name) {
int column = -1;
for (int i = 0; i < name.length(); ++i) {
int c = name.charAt(i);
column = (column + 1) * 26 + c - 'A';
}
return column;
}

private String formateDateToString(Date date) {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//格式化日期
return sdf.format(date);

}

}

// /////////////////////////////////////

private OPCPackage xlsxPackage;
private int minColumns;
private PrintStream output;
private String sheetName;

/**
* Creates a new XLSX -> CSV converter
*
* @param pkg
*            The XLSX package to process
* @param output
*            The PrintStream to output the CSV to
* @param minColumns
*            The minimum number of columns to output, or -1 for no minimum
*/
public XLSXCovertCSVReader(OPCPackage pkg, PrintStream output,
String sheetName, int minColumns) {
this.xlsxPackage = pkg;
this.output = output;
this.minColumns = minColumns;
this.sheetName = sheetName;
}

/**
* Parses and shows the content of one sheet using the specified styles and
* shared-strings tables.
*
* @param styles
* @param strings
* @param sheetInputStream
*/
public List<String[]> processSheet(StylesTable styles,
ReadOnlySharedStringsTable strings, InputStream sheetInputStream)
throws IOException, ParserConfigurationException, SAXException {

InputSource sheetSource = new InputSource(sheetInputStream);
SAXParserFactory saxFactory = SAXParserFactory.newInstance();
SAXParser saxParser = saxFactory.newSAXParser();
XMLReader sheetParser = saxParser.getXMLReader();
MyXSSFSheetHandler handler = new MyXSSFSheetHandler(styles, strings,
this.minColumns, this.output);
sheetParser.setContentHandler(handler);
sheetParser.parse(sheetSource);
return handler.getRows();
}

/**
* 初始化这个处理程序 将
*
* @throws IOException
* @throws OpenXML4JException
* @throws ParserConfigurationException
* @throws SAXException
*/
public List<String[]> process() throws IOException, OpenXML4JException,
ParserConfigurationException, SAXException {

ReadOnlySharedStringsTable strings = new ReadOnlySharedStringsTable(
this.xlsxPackage);
XSSFReader xssfReader = new XSSFReader(this.xlsxPackage);
List<String[]> list = null;
StylesTable styles = xssfReader.getStylesTable();
XSSFReader.SheetIterator iter = (XSSFReader.SheetIterator) xssfReader
.getSheetsData();
int index = 0;
while (iter.hasNext()) {
InputStream stream = iter.next();
String sheetNameTemp = iter.getSheetName();
if (this.sheetName.equals(sheetNameTemp)) {
list = processSheet(styles, strings, stream);
stream.close();
++index;
}
}
return list;
}

/**
* 读取Excel
*
* @param path
*            文件路径
* @param sheetName
*            sheet名称
* @param minColumns
*            列总数
* @return
* @throws SAXException
* @throws ParserConfigurationException
* @throws OpenXML4JException
* @throws IOException
*/
private static List<String[]> readerExcel(File file, String sheetName,
int minColumns) throws IOException, OpenXML4JException,
ParserConfigurationException, SAXException {
OPCPackage p = OPCPackage.open(file, PackageAccess.READ);
XLSXCovertCSVReader xlsx2csv = new XLSXCovertCSVReader(p, System.out,
sheetName, minColumns);
List<String[]> list = xlsx2csv.process();
p.close();
return list;
}

/**
* 根据获取的excel把可以转换为list返回
* @param file
* @param sheetName
* @param length
* @return
* @throws IOException
* @throws OpenXML4JException
* @throws ParserConfigurationException
* @throws SAXException
*/
public static List<Busscompany> importCompanyList(MultipartFile file, String sheetName, int length) throws IOException, OpenXML4JException, ParserConfigurationException, SAXException {
CommonsMultipartFile cf = (CommonsMultipartFile)file;
DiskFileItem fi = (DiskFileItem)cf.getFileItem();
File f = fi.getStoreLocation();
List<String[]> list = XLSXCovertCSVReader.readerExcel(f, sheetName, length);
List<Busscompany> companys = new ArrayList<Busscompany>();
for(int i = 1; i < list.size(); i++) {
String[] record = list.get(i);
Busscompany company = new Busscompany();
company.setCompanyname(record[0] != null ? record[0].replace("\"", "") : "");
company.setCompanyurl(record[1] != null ? record[1].replace("\"", "") : "");
company.setCompanycontract(record[2] != null ? record[2].replace("\"", "") : "");
company.setCompanyphone(record[3] != null ? record[3].replace("\"", "") : "");
company.setCompanyemail(record[4] != null ? record[4].replace("\"", "") : "");
company.setCallno(record[5] != null ? record[5].replace("\"", "") : "");
companys.add(company);
}
return companys;
}
public static void main(String[] args) throws Exception {
List<String[]> list = XLSXCovertCSVReader
.readerExcel(
"D:\\20161206.xlsx",
"Export", 6);
List<Busscompany> companys = new ArrayList<Busscompany>();
for (String[] record : list) {
Busscompany company = new Busscompany();
company.setCompanyname(record[0] != null ? record[0] : "");
company.setCompanyurl(record[1] != null ? record[1] : "");
company.setCompanycontract(record[2] != null ? record[2] : "");
company.setCompanyphone(record[3] != null ? record[3] : "");
company.setCompanyemail(record[4] != null ? record[4] : "");
company.setCallno(record[5] != null ? record[5] : "");
for (String cell : record) {
System.out.print(cell + "  ");
}
companys.add(company);
System.out.println();
}
System.out.println("excel数据量 ：" + companys.size());

}

}

main方法中经过修改，把服务器生成文件改成springmvc中上传文件，通过转化，然后获取list返回