欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

基于POI的Excel工具类 JSON2Bean

程序员文章站 2022-05-31 16:29:50
...
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 com.alibaba.fastjson.JSON;
import org.apache.commons.collections.map.ListOrderedMap;
import org.apache.poi.ss.usermodel.Cell;
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.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFDateUtil;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

/**
 * Excel工具类
 *
 * @author Juno
 *
 */
@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
    private static String pattern;// 日期格式

    /**
     * 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 = JSON.parseObject(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 = JSON.parseObject(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;
    }

    /**
     * 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 = getCellValueToString(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 = getCellValueToString(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 = getCellValueToString(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 = getCellValueToString(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 getCellValueToString(Cell cell) {
        String strCell = "";
        if (cell == null) {
            return null;
        }
        switch (cell.getCellType()) {
            case BOOLEAN:
                strCell = String.valueOf(cell.getBooleanCellValue());
                break;
            case NUMERIC:
                if (HSSFDateUtil.isCellDateFormatted(cell)) {
                    Date date = cell.getDateCellValue();
                    if (pattern != null) {
                        SimpleDateFormat sdf = new SimpleDateFormat(pattern);
                        strCell = sdf.format(date);
                    } else {
                        strCell = date.toString();
                    }
                    break;
                }
                // 不是日期格式,则防止当数字过长时以科学计数法显示
                //cell.setCellType(HSSFCell.CELL_TYPE_STRING);
                strCell = cell.toString();
                break;
            case STRING:
                strCell = cell.getStringCellValue();
                break;
            default:
                strCell = "";
                break;
        }
        return strCell;
    }


    /**
     * 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;
    }

    public void setPattern(String pattern) {
        this.pattern = pattern;
    }
}

 

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>4.1.0</version>
            <type>jar</type>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.1.0</version>
            <type>jar</type>
        </dependency>
        <dependency>
            <groupId>commons-collections</groupId>
            <artifactId>commons-collections</artifactId>
            <version>3.2.2</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.60</version>
        </dependency>

相关标签: JAVA POI JSON