java实现创建excel表并导出到本地

java创建excel的效果图：

java实现excel导入本地的效果图：

代码块

1. 创建Member类，此类用来创建对象，存储在excel表格中的数据

package com.yu.bai.excel;

import java.util.Date;
//创建一个实体对象,用来存储到excel表中
public class Member {
    private Integer code;
    private String name;
    private Integer age;
    private Date birth;

    public Member(Integer code, String name, Integer age, Date birth) {
        super();
        this.code = code;
        this.name = name;
        this.age = age;
        this.birth = birth;
    }

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public Date getBirth() {
        return birth;
    }

    public void setBirth(Date birth) {
        this.birth = birth;
    }
}

2. 初始化数据，并运行

package com.yu.bai.excel;

import java.io.FileOutputStream;
import java.io.OutputStream;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

/**
 * 创建excel，写入数据，然后下载到本地
 * 
 * @author baiyu
 *
 */
public class DownloadExcel {

    public static void main(String[] args) {
        Map<String, List<String>> memberMap = getMember();
        String[] strArray = excelTitle();
        ExcelUtil.createExcel(memberMap, strArray);
    }

    /**
     * 初始化数据，将会被存储到excel表格中
     * 
     * @return
     * @throws Exception
     */
    private static Map<String, List<String>> getMember() {
        List<Member> list = new ArrayList<Member>();
        Map<String, List<String>> map = new HashMap<String, List<String>>();
        SimpleDateFormat df = new SimpleDateFormat("yyyy-mm-dd");

        try {
            Member user1 = new Member(1, "熊大", 24, df.parse("1993-08-28"));
            Member user2 = new Member(2, "熊二", 23, df.parse("1994-08-19"));
            Member user3 = new Member(3, "熊熊", 24, df.parse("1983-11-22"));

            list.add(user1);
            list.add(user2);
            list.add(user3);

            for (int i = 0; i < list.size(); i++) {
                ArrayList<String> members = new ArrayList<String>();
                members.add(list.get(i).getCode() + "");
                members.add(list.get(i).getName());
                members.add(list.get(i).getAge() + "");
                members.add(df.format(list.get(i).getBirth()));
                map.put(list.get(i).getCode() + "", members);
            }
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return map;
    }

    /**
     * 创建excel title
     */
    public static String[] excelTitle() {
        String[] strArray = { "学号", "姓名", "年龄", "生日" };
        return strArray;
    }
}

3. 编写公共的ExcelUtil工具包，用来创建excel，并写入数据，和导入本地

package com.yu.bai.excel;

import java.io.FileOutputStream;
import java.util.List;
import java.util.Map;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class ExcelUtil {
    /**
     * @功能：手工构建一个简单格式的Excel
     */
    public static void createExcel(Map<String, List<String>> map, String[] strArray) {
        // 第一步，创建一个webbook，对应一个Excel文件
        HSSFWorkbook wb = new HSSFWorkbook();
        // 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet
        HSSFSheet sheet = wb.createSheet("sheet1");
        sheet.setDefaultColumnWidth(20);// 默认列宽
        // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short
        HSSFRow row = sheet.createRow((int) 0);
        // 第四步，创建单元格，并设置值表头 设置表头居中
        HSSFCellStyle style = wb.createCellStyle();
        // 创建一个居中格式
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER);

        // 添加excel title
        HSSFCell cell = null;
        for (int i = 0; i < strArray.length; i++) {
            cell = row.createCell((short) i);
            cell.setCellValue(strArray[i]);
            cell.setCellStyle(style);
        }

        // 第五步，写入实体数据 实际应用中这些数据从数据库得到,list中字符串的顺序必须和数组strArray中的顺序一致
        int i = 0;
        for (String str : map.keySet()) {
            row = sheet.createRow((int) i + 1);
            List<String> list = map.get(str);

            // 第四步，创建单元格，并设置值
            for (int j = 0; j < strArray.length; j++) {
                row.createCell((short) j).setCellValue(list.get(j));
            }

            // 第六步，将文件存到指定位置
            try {
                FileOutputStream fout = new FileOutputStream("E:/template/Members.xls");
                wb.write(fout);
                fout.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            i++;
        }
    }
}