com.zhongweixian.excel.imports.sax.SheetHandler Maven / Gradle / Ivy

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package com.zhongweixian.excel.imports.sax;

import com.zhongweixian.excel.entity.enmus.CellValueType;
import com.zhongweixian.excel.imports.sax.parse.ISaxRowRead;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.xssf.model.SharedStringsTable;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
 * @author : caoliang
 * @date : 2017/11/14  下午2:40
 */
public class SheetHandler extends DefaultHandler {

    private SharedStringsTable sst;
    private String lastContents;

    //当前行

    private int curRow = 0;
    //当前列

    private int curCol = 0;

    private CellValueType type;

    private ISaxRowRead read;

    //存储行记录的容器

    private List rowlist = new ArrayList();

    public SheetHandler(SharedStringsTable sst, ISaxRowRead rowRead) {
        this.sst = sst;
        this.read = rowRead;
    }

    @Override
    public void startElement(String uri, String localName, String name,
                             Attributes attributes) throws SAXException {
        // 置空

        lastContents = "";
        // c => 单元格

        if ("c".equals(name)) {
            // 如果下一个元素是 SST 的索引，则将nextIsString标记为true

            String cellType = attributes.getValue("t");
            if ("s".equals(cellType)) {
                type = CellValueType.String;
                return;
            }
            //日期格式

            cellType = attributes.getValue("s");
            if ("1".equals(cellType)) {
                type = CellValueType.Date;
            } else if ("2".equals(cellType)) {
                type = CellValueType.Number;
            }
        } else if ("t".equals(name)) {//当元素为t时

            type = CellValueType.TElement;
        }

    }

    @Override
    public void endElement(String uri, String localName, String name) throws SAXException {

        // 根据SST的索引值的到单元格的真正要存储的字符串

        // 这时characters()方法可能会被调用多次

        if (CellValueType.String.equals(type)) {
            try {
                int idx = Integer.parseInt(lastContents);
                lastContents = new XSSFRichTextString(sst.getEntryAt(idx)).toString();
            } catch (Exception e) {

            }
        }
        //t元素也包含字符串

        if (CellValueType.TElement.equals(type)) {
            String value = lastContents.trim();
            rowlist.add(curCol, new SaxReadCellEntity(CellValueType.String, value));
            curCol++;
            type = CellValueType.None;
            // v => 单元格的值，如果单元格是字符串则v标签的值为该字符串在SST中的索引

            // 将单元格内容加入rowlist中，在这之前先去掉字符串前后的空白符

        } else if ("v".equals(name)) {
            String value = lastContents.trim();
            value = "".equals(value) ? " " : value;
            if (CellValueType.Date.equals(type)) {
                Date date = HSSFDateUtil.getJavaDate(Double.valueOf(value));
                rowlist.add(curCol, new SaxReadCellEntity(CellValueType.Date, date));
            } else if (CellValueType.Number.equals(type)) {
                BigDecimal bd = new BigDecimal(value);
                rowlist.add(curCol, new SaxReadCellEntity(CellValueType.Number, bd));
            } else if (CellValueType.String.equals(type)) {
                rowlist.add(curCol, new SaxReadCellEntity(CellValueType.String, value));
            }
            curCol++;
        } else if ("row".equals(name)) {//如果标签名称为 row ，这说明已到行尾，调用 optRows() 方法

            read.parse(curRow, rowlist);
            rowlist.clear();
            curRow++;
            curCol = 0;
        }

    }

    @Override
    public void characters(char[] ch, int start, int length) throws SAXException {
        //得到单元格内容的值

        lastContents += new String(ch, start, length);
    }

}