一个通用的将List<T>中数据导出为Excel文档代码,Java代码库,德仔网

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【Java】一个通用的将List中数据导出为Excel文档
作者:金璇 / 发布于2016/3/30/ 654
出处：自编，欢迎修改平台：jdk 1.7及以上依赖：POI相关jar 用途：可以将List中数据导出为Excel文档的工具类，期中T为你想要打印的数据类，如User、Wind等特点：简单技术：使用了简单的反射技术，支持任意对象
package com.iue.util;
 
import java.util.List;
 
 
/**
 * 代表要打印的Excel表格,用于存放要导出为Excel的相关数据
 * @author zhrb@cec.jmu
 *
 * @param <T> 代表要打印的数据实体，如User等
 */
public  class  ExcelEntity<T> {
    private String sheetName = "Sheet1";//默认生成的sheet名称
    private String header="";//题头
    private String footer="";//脚注
    //底下是必须具备的属性
    private String fileName;
    private String[] columnNames;//列名
    private String[] methodNames;//与列名对应的方法名
    private List<T> entities;//数据实体
     
     
     
 
    public ExcelEntity(String fileName, String[] columnNames, String[] methodNames, List<T> entities) {
        this("sheet1","","",fileName,columnNames,methodNames,entities);
    }
    public ExcelEntity(String sheetName, String header, String footer, String fileName, String[] columnNames,
            String[] methodNames, List<T> entities) {
         
        this.sheetName = sheetName;
        this.header = header;
        this.footer = footer;
        this.fileName = fileName;
        this.columnNames = columnNames;
        this.methodNames = methodNames;
        this.entities = entities;
    }
    public String getHeader() {
        return header;
    }
    public void setHeader(String header) {
        this.header = header;
    }
     
    public String getSheetName() {
        return sheetName;
    }
    public void setSheetName(String sheetName) {
        this.sheetName = sheetName;
    }
    public List<T> getEntities() {
        return entities;
    }
    /**
     * 
     * @param entities 用于导出Excel的实体集合
     */
    public void setEntities(List<T> entities) {
        this.entities = entities;
    }
     
    public String getFooter() {
        return footer;
    }
    public void setFooter(String footer) {
        this.footer = footer;
    }
 
    public String[] getColumnNames() {
        return columnNames;
    }
 
    public void setColumnNames(String[] columnNames) {
        this.columnNames = columnNames;
    }
 
    public String getFileName() {
        return fileName;
    }
 
    public void setFileName(String fileName) {
        this.fileName = fileName;
    }
 
 
 
    public String[] getMethodNames() {
        return methodNames;
    }
 
 
 
    public void setMethodNames(String[] methodNames) {
        this.methodNames = methodNames;
    }
     
     
 
}



package com.iue.util;
 
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
 
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.Footer;
import org.apache.poi.ss.usermodel.Header;
import org.apache.poi.ss.usermodel.IndexedColors;
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.XSSFWorkbook;
 
import com.iue.model.Wind;
 
/**
 * 一个通用的将List<T>中数据导出为Excel文档的工具类
 * @author zhrb@cec.jmu
 */
public class ExcelExporter {
     
    /**
     * 根据ExcelEntity等参数生成Workbook
     * @param entity
     * @return
     * @throws Exception
     */
    public static <T> Workbook export2Excel(ExcelEntity<T> entity) throws Exception{
        Workbook workbook = export2Excel(entity.getHeader(), entity.getFooter(),entity.getSheetName(), entity.getColumnNames(), entity.getMethodNames(),
                entity.getEntities());
        return workbook;
    }
 
 
    /**
     * 根据给定参数导出Excel文档
     * 
     * @param headerTitle
     *            题头
     * @param footer 脚注
     * @param sheetName
     * @param columnNames
     *            表头名称
     * @param methodNames
     * @param entities
     * @return
     * @throws Exception
     */
    public static <T> Workbook export2Excel(String headerTitle, String footerTitle, String sheetName, String[] columnNames,
            String[] methodNames, List<T> entities) throws Exception {
        if (methodNames.length != columnNames.length)
            throw new IllegalArgumentException("methodNames.length should be equal to columnNames.length:"
                    + columnNames.length + " " + methodNames.length);
        Workbook newWorkBook2007 = new XSSFWorkbook();
        Sheet sheet = newWorkBook2007.createSheet(sheetName);
         
        //设置题头
        Header header = sheet.getHeader();
        header.setCenter(headerTitle);
        //设置脚注
        Footer footer = sheet.getFooter();
        footer.setCenter(footerTitle);
         
        int[] columnWidths = new int[columnNames.length];
        // 创建表头
        createTableHeader(sheet, 0, headerTitle, columnNames, columnWidths);
        // 填充表内容
        createTableContent(sheet, 1, methodNames, columnWidths, entities);
 
        return newWorkBook2007;
 
    }
 
    /**
     * 创建表头
     * 
     * @param sheet
     * @param index
     *            表头开始的行数
     * @param headerTitle
     *            题头
     * @param columnNames
     * @param columnWidths
     */
    private static void createTableHeader(Sheet sheet, int index, String headerTitle, String[] columnNames,
            int[] columnWidths) {
         
 
        Row headerRow = sheet.createRow(index);
 
        /* 格式设置 */
        // 设置字体
        Font font = sheet.getWorkbook().createFont();
        font.setBoldweight(Font.BOLDWEIGHT_BOLD);// 粗体显示
        // 设置背景色
        CellStyle style = sheet.getWorkbook().createCellStyle();
        style.setFillForegroundColor(IndexedColors.PALE_BLUE.getIndex());
        style.setFillPattern(CellStyle.SOLID_FOREGROUND);
        style.setFont(font);
 
        for (int i = 0; i < columnNames.length; i++) {
            Cell headerCell = headerRow.createCell(i);
            headerCell.setCellStyle(style);
            headerCell.setCellValue(columnNames[i]);
        }
 
        for (int i = 0; i < columnNames.length; i++) {
            columnWidths[i] = (columnNames[i].getBytes().length + 2) * 256;
            sheet.setColumnWidth(i, columnWidths[i]);
        }
 
    }
 
    /**
     * 创建表格内容
     * 
     * @param sheet
     * @param rowIndexBegin
     *            表内容开始的行数
     * @param methodNames
     *            T对象的方法名
     * @param columnWidths
     * @param entities
     * @throws Exception
     */
    private static <T> void createTableContent(Sheet sheet, int rowIndexBegin, String[] methodNames, int[] columnWidths,
            List<T> entities) throws Exception {
        Class<? extends Object> clazz = null;
        if (entities.size() > 0)
            clazz = entities.get(0).getClass();
 
        String content = null;
        for (T t : entities) {
            Row row = sheet.createRow(rowIndexBegin++);
            for (int i = 0; i < methodNames.length; i++) {
                Cell cell = row.createCell(i);
                Method method = clazz.getMethod(methodNames[i], null);
                Object object = method.invoke(t, null);
                object = object == null ? "" : object;
                if (object.getClass().equals(Date.class)) {// 对日期格式进行特殊处理
                    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                    content = sdf.format((Date) object);
                    cell.setCellValue(content);
                } else {
                    content = object.toString();
                    cell.setCellValue(content);
                }
                int columnWidth = (content.getBytes().length + 2) * 256;
                if (columnWidth > columnWidths[i]) {// 如果实际内容宽度大于对应的表头宽度，则设置为实际内容宽度
                    columnWidths[i] = columnWidth;
                    sheet.setColumnWidth(i, columnWidths[i]);
                }
 
            }
        }
    }
 
    public static <T> void testPOI(String[] columnNames, String[] methodNames, List<T> entities) throws Exception {
        String sheetName = "Test";
        String title = "标题栏";
        String dstFile = "d:/temp/test.xlsx";
        Workbook newWorkBook2007 = new XSSFWorkbook();
        Sheet sheet = newWorkBook2007.createSheet(sheetName);
        int[] columnWidths = new int[columnNames.length];
        // 创建表头
        createTableHeader(sheet, 0, title, columnNames, columnWidths);
        // 填充表内容
        createTableContent(sheet, 1, methodNames, columnWidths, entities);
        // 保存为文件
        saveWorkBook2007(newWorkBook2007, dstFile);
        System.out.println("end");
 
    }
 
    /**
     * 将workbook2007村委文件
     * 
     * @param workbook2007
     * @param dstFile
     */
    public static void saveWorkBook2007(Workbook workbook2007, String dstFile) {
        File file = new File(dstFile);
        OutputStream os = null;
        try {
            os = new FileOutputStream(file);
            workbook2007.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (os != null) {
                try {
                    os.close();
                } catch (IOException e) {
                    System.out.println(e);
                }
            }
        }
    }
     
 
    /**
     * 测试方法
     * @param args
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        // 准备数据
        List<Wind> winds = new ArrayList<>();// Wind有三个方法:getLocation、getSpeed、getTimestamp
        for (int i = 0; i < 10; i++) {
            Wind wind = new Wind();
            wind.setLocation(i);
            wind.setSpeed(i * 10);
            wind.setTimestamp("2016/3/2" + i);
            winds.add(wind);
        }
        String[] columnNames = { "地点", "速度", "时间" };
        String[] methodNames = { "getLocation", "getSpeed", "getTimestamp" };
//      String fileName = "d:/temp/excel1.xlsx";
        String fileName = "d:/excel1.xlsx";
        // 生成ExcelEntity实体，包含4个必备参数
        ExcelEntity<Wind> excelEntity = new ExcelEntity<>(fileName, columnNames, methodNames, winds);
        //excelEntity.setHeader("题头");
        //excelEntity.setFooter("脚注");
        Workbook excel = ExcelExporter.export2Excel(excelEntity);
        //ExcelExporter.export2Excel("题头","脚注", "sheet1", columnNames, methodNames, winds);//也可以这样调用,无需新建ExcelEntity对象
        //将Workbook存为文件
        ExcelExporter.saveWorkBook2007(excel, excelEntity.getFileName());
         
        System.out.println("导出完成！");
 
    }
 
}
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