java poi excel 生成表格的工具封装

效果如下：

代码如下：

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.util.CellRangeAddress;
/**
 * 使用该类时，确定引入的poi相关的jar包
 * Maven如下：
 *         <!-- POI -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.15</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.15</version>
        </dependency>
 * @author Mr.wang
 * @date 2018/06/14
 *
 */
public class ExcelUtils {
    public static void main(String[] args) throws IOException {
        List<String> title = Arrays.asList("姓名", "年龄", "生日", "邮箱");

        List<List<String>> personInfos = new ArrayList<List<String>>();
        List<String> person01 = Arrays.asList("Ben", "26", "1992-02-12", "ben@sina.com");
        List<String> person02 = Arrays.asList("Tom", "27", "1993-08-18", "tom@sina.com");
        List<String> person03 = Arrays.asList("Jack", "28", "1994-03-28", "jack@sina.com");
        List<String> person04 = Arrays.asList("恩索", "29", "1995-01-09", "enso@sina.com");
        personInfos.add(person01);
        personInfos.add(person02);
        personInfos.add(person03);
        personInfos.add(person04);

        File file = new File("D:/demo.xls");

        //createExcelFile(title, personInfos, file, null);
        createExcelFileWithHead(title, personInfos, file, null, "个人信息表");

    }

    /**
     * 由生成流的方法进一步封装成生成excel（.xls）的文件
     * @see #createExcelInStream(List, List, OutputStream, String)
     * @param title
     * @param listData
     * @param fileWithPathAndName
     * @param sheetName
     * @throws IOException
     */
    public static void createExcelFile(List<String> title, List<List<String>> listData, File fileWithPathAndName,
            String sheetName) throws IOException {
        FileOutputStream fos=new FileOutputStream(fileWithPathAndName);
        createExcelInStream(title, listData, fos, sheetName);
        if(fos!=null) {
            fos.close();
        }
    }
    
    /**
     * 由生成流的方法进一步封装成生成excel（.xls）的文件
     * @see #createExcelInStreamWithHead(List, List, OutputStream, String, String)
     * @param title
     * @param listData
     * @param fileWithPathAndName
     * @param sheetName
     * @param header
     * @throws IOException
     */
    public static void createExcelFileWithHead(List<String> title, List<List<String>> listData, File fileWithPathAndName,
            String sheetName,String header) throws IOException {
        FileOutputStream fos=new FileOutputStream(fileWithPathAndName);
        createExcelInStreamWithHead(title, listData, fos, sheetName, header);
        if(fos!=null) {
            fos.close();
        }
    }
    /**
     * create by Mr.wang 2018/06/14
     * 
     * 生成excel流（不带表头）。以xls为后缀的文件，防止有些电脑不支持office07以上的
     * 
     * @param title
     *            标题
     * @param listData
     *            数据内容
     * @param outputStream
     *            输出的流
     * @param sheetName
     *            创建的sheet（不是文件）的名称，如果有空，则采用sheet1作用默认的表名称
     * @throws IOException
     * 
     * 
     * example:
     *  
     *  List<String> title = Arrays.asList("姓名", "年龄", "生日", "邮箱");

        List<List<String>> personInfos = new ArrayList<List<String>>();
        List<String> person01 = Arrays.asList("Ben", "26", "1992-02-12", "ben@sina.com");
        List<String> person02 = Arrays.asList("Tom", "27", "1993-08-18", "tom@sina.com");
        List<String> person03 = Arrays.asList("Jack", "28", "1994-03-28", "jack@sina.com");
        List<String> person04 = Arrays.asList("恩索", "29", "1995-01-09", "enso@sina.com");
        personInfos.add(person01);
        personInfos.add(person02);
        personInfos.add(person03);
        personInfos.add(person04);

        File file = new File("D:/demo.xls");
        FileOutputStream fos=new FileOutputStream(file);

        createExcelFile(title, personInfos, fos, null);
        ...
     * 
     */
    @SuppressWarnings("deprecation")
    public static void createExcelInStream(List<String> title, List<List<String>> listData, OutputStream outputStream,
            String sheetName) throws IOException {
        // 创建工作簿
        HSSFWorkbook workBook = new HSSFWorkbook();
        
        // 创建工作表 工作表的名字叫helloWorld
        if (sheetName == null || sheetName.length() == 0) {
            sheetName = "sheet1";
        }
        HSSFSheet sheet = workBook.createSheet(sheetName);
        
        // 创建单元格，首先设置标题
        HSSFFont fontTitle = workBook.createFont();
        fontTitle.setBold(true);
        HSSFCellStyle titleStyle = workBook.createCellStyle();
        titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        titleStyle.setFont(fontTitle);
        HSSFRow titleRow = sheet.createRow(0);
        for (int i = 0; i < title.size(); i++) {
            HSSFCell titleCol = titleRow.createCell(i, CellType.STRING);
            titleCol.setCellValue(title.get(i));
            titleCol.setCellStyle(titleStyle);
        }
        sheet.autoSizeColumn(0);
        // 创建数据行
        HSSFCellStyle dataStyle = workBook.createCellStyle();
        dataStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        for (int i = 0; i < listData.size(); i++) {
            HSSFRow dataRow = sheet.createRow(i + 1);
            List<String> rowData = listData.get(i);
            for (int j = 0; j < rowData.size(); j++) {
                HSSFCell dataCol = dataRow.createCell(j, CellType.STRING);
                dataCol.setCellValue(rowData.get(j));
                dataCol.setCellStyle(dataStyle);
            }
            sheet.autoSizeColumn(i);
        }
        
        HSSFRow firstRow = sheet.getRow(0);
        int lastCellNum = firstRow.getLastCellNum();
        //为了美观，把所有的cell扩大1/2
        for(int i=0;i<lastCellNum;i++) {
            int columnWidth = sheet.getColumnWidth(i);
            sheet.setColumnWidth(i, columnWidth+columnWidth*1/2);
        }
        
        workBook.write(outputStream);
        
        workBook.close();// 最后记得关闭工作簿
    }
    
    /**
     * create by Mr.wang 2018/06/14
     * 
     * 生成excel流（带表头）。以xls为后缀的文件，防止有些电脑不支持office07以上的
     * 
     * @param title
     *            标题
     * @param listData
     *            数据内容
     * @param outputStream
     *            输出的流
     * @param sheetName
     *            创建的sheet（不是文件）的名称，如果有空，则采用sheet1作用默认的表名称
     * @param header
     *            表的表头
     * @throws IOException
     * 
     * 
     * example:
     *  
     *  List<String> title = Arrays.asList("姓名", "年龄", "生日", "邮箱");

        List<List<String>> personInfos = new ArrayList<List<String>>();
        List<String> person01 = Arrays.asList("Ben", "26", "1992-02-12", "ben@sina.com");
        List<String> person02 = Arrays.asList("Tom", "27", "1993-08-18", "tom@sina.com");
        List<String> person03 = Arrays.asList("Jack", "28", "1994-03-28", "jack@sina.com");
        List<String> person04 = Arrays.asList("恩索", "29", "1995-01-09", "enso@sina.com");
        personInfos.add(person01);
        personInfos.add(person02);
        personInfos.add(person03);
        personInfos.add(person04);

        File file = new File("D:/demo.xls");
        FileOutputStream fos=new FileOutputStream(file);

        createExcelFileWithHead(title, personInfos, fos, null, "个人信息表");
        ...
     * 
     */
    @SuppressWarnings("deprecation")
    public static void createExcelInStreamWithHead(List<String> title, List<List<String>> listData, OutputStream outputStream,
            String sheetName,String header) throws IOException {
        // 创建工作簿
        HSSFWorkbook workBook = new HSSFWorkbook();
        
        // 创建工作表 工作表的名字叫helloWorld
        if (sheetName == null || sheetName.length() == 0) {
            sheetName = "sheet1";
        }
        HSSFSheet sheet = workBook.createSheet(sheetName);
        
        //设置表头
        //参数说明：1：开始行 2：结束行  3：开始列 4：结束列  
        //比如我要合并 第二行到第四行的    第六列到第八列     sheet.addMergedRegion(new CellRangeAddress(1,3,5,7));  
        sheet.addMergedRegion(new CellRangeAddress(0,0,0,title.size()-1)); 
        HSSFRow headerRow = sheet.createRow(0);
        HSSFCell headerCell = headerRow.createCell(0);
        
        
        // 创建单元格，首先设置标题
        HSSFFont font = workBook.createFont();
        short fontHeightInPoints = font.getFontHeightInPoints();
        font.setFontHeightInPoints((short)(fontHeightInPoints+2));
        font.setBold(true);
        HSSFCellStyle cellHeaderStyle = workBook.createCellStyle();
        cellHeaderStyle.setFont(font);
        cellHeaderStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        headerCell.setCellStyle(cellHeaderStyle);//可表头加粗,居中
        headerCell.setCellValue(header);
        
        //cellStyle.setAlignment(alignmentEnum);//还原，标题不居中
        HSSFFont fontTitle = workBook.createFont();
        fontTitle.setBold(true);
        HSSFCellStyle titleStyle = workBook.createCellStyle();
        titleStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        titleStyle.setFont(fontTitle);
        HSSFRow titleRow = sheet.createRow(1);
        for (int i = 0; i < title.size(); i++) {
            HSSFCell titleCol = titleRow.createCell(i, CellType.STRING);
            titleCol.setCellValue(title.get(i));
            titleCol.setCellStyle(titleStyle);
        }
        sheet.autoSizeColumn(1);
        // 创建数据行
        
        HSSFCellStyle dataStyle = workBook.createCellStyle();
        dataStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
        for (int i = 0; i < listData.size(); i++) {
            HSSFRow dataRow = sheet.createRow(i + 2);
            List<String> rowData = listData.get(i);
            for (int j = 0; j < rowData.size(); j++) {
                HSSFCell dataCol = dataRow.createCell(j, CellType.STRING);
                dataCol.setCellValue(rowData.get(j));
                dataCol.setCellStyle(dataStyle);
            }
            sheet.autoSizeColumn(i);
        }
        
        HSSFRow firstRow = sheet.getRow(1);
        int lastCellNum = firstRow.getLastCellNum();
        //为了美观，把所有的cell扩大1/2
        for(int i=0;i<lastCellNum;i++) {
            int columnWidth = sheet.getColumnWidth(i);
            sheet.setColumnWidth(i, columnWidth+columnWidth*1/2);
        }
        
        workBook.write(outputStream);
        
        workBook.close();// 最后记得关闭工作簿
    }

}

相关工具方法

/**
     * create by Mr.wang 2018/06/14
     * 
     * 将简单的对象(读取不到父类的属性)转化成List<String>
     * 
     * @param o 对象
     * @param convertMap 转换器 指定对象属性中某一个属性值如何转化为String。如果不需要，可以设置成null即可
     * @param args 指定要输出的属性,一般用于属性选择和排序 ，如果不需要，则不设置.如果要查找父类的属性，则自身及父类的属性全部定义在此处，不再自动搜索自身的属性
     *                 这里注意如果同样的属性要利用两次，可以使用field&alias的格式来指定转换器
     *                 例如：code,code&1---->code&1可以设定与之对应的转换器
     * @return
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws NoSuchFieldException
     * @throws SecurityException
     * 
     * example:
     * {
     *         "name":"jack",
     *         "age":26,
     *         "birthday":new Date()
     * }
     * 转成
     * ["jack","26","2018-06-14 16:02:20"]
     */
    public static List<String> convertSimpleObj2StringList(Object o,Map<String,FieldConvert> convertMap,String... args) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException{
        List<String> list=new ArrayList<String>();
        Class<? extends Object> objClas = o.getClass();
        if(args.length==0) {
            Field[] declaredFields = objClas.getDeclaredFields();
            for(Field f : declaredFields) {
                f.setAccessible(true);
                String fileName = f.getName();
                Object obj=f.get(o);//对应的属性没值，则设置为“/”
                processFieldValue(convertMap, list, fileName, obj);
            }
        }else {
            for(String ag : args) {
                String fieldKey=null;
                String convertKey=ag;
                if(ag.contains("&")) {
                    String[] split = ag.split("&");
                    fieldKey=split[0];
                }else {
                    fieldKey=ag;
                }
                Object fieldValue = getFieldValue(o, fieldKey);
                processFieldValue(convertMap, list, convertKey, fieldValue);
            }
        }
        return list;
    }

    private static void processFieldValue(Map<String, FieldConvert> convertMap, List<String> list, String ag, Object fieldValue) {
        if(fieldValue==null) {
            list.add("/");
            return;
        }else {
            if(convertMap!=null&&convertMap.containsKey(ag)){
                FieldConvert filedConvert = convertMap.get(ag);
                String s = filedConvert.covertFiledValueToString(fieldValue);
                if(s!=null){
                    list.add(s);
                }else{
                    list.add("/");
                }
            }else{
                list.add(fieldValue.toString());
            }
        }
    }

    /**
     * create by Mr.wang 2018/06/14
     * @see #convertSimpleObj2StringList
     * @param objs
     * @param convertMap
     * @param args
     * @return
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     * @throws NoSuchFieldException
     * @throws SecurityException
     */
    public static <T> List<List<String>> convertSimpleObjList2StringList(List<T> objs,Map<String,FieldConvert> convertMap,String... args) throws IllegalArgumentException, IllegalAccessException, NoSuchFieldException, SecurityException{
        List<List<String>> list=new ArrayList<List<String>>();
        for(T obj : objs) {
            list.add(convertSimpleObj2StringList(obj,convertMap,args));
        }
        return list;
    }
    

    /**
     * create by Mr.wang 2018/06/14
     * 通过反射，向上（父类）一直获取对象的属性，如果一直获取不到则抛 NoSuchFieldException 异常
     * @param obj 要操作的操作
     * @param fieldName 要获取的属性名称
     * @return
     * @throws NoSuchFieldException
     * @throws SecurityException
     * @throws IllegalArgumentException
     * @throws IllegalAccessException
     */
    public static Object getFieldValue(Object obj,String fieldName) throws NoSuchFieldException, SecurityException, IllegalArgumentException, IllegalAccessException {
        Class<? extends Object> class1 = obj.getClass();
        Field declaredField=null;
        try {
            declaredField = class1.getDeclaredField(fieldName);
        } catch (NoSuchFieldException e) {
            declaredField=null;
        }
        while(declaredField==null) {
            class1=class1.getSuperclass();
            if(class1==null) {
                throw new NoSuchFieldException();
            }
            try {
                declaredField = class1.getDeclaredField(fieldName);
            } catch (NoSuchFieldException e) {
                declaredField=null;
            }
        }
        declaredField.setAccessible(true);
        return declaredField.get(obj);
    }


 FieldConvert.java




public interface FieldConvert {
    String covertFiledValueToString(Object filedValue);
}






        

	      

	    

	  

	  

	    
      
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          原文地址：https://www.cnblogs.com/wangyang108/p/9182714.html