Easyexcel数据追加模式_easyexcel在原有内容上添加数据

引入依赖

<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.9.0</version>
</dependency>

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>3.1.1</version>
</dependency>

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.20</version>
</dependency>  
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

demo案例

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.annotation.ExcelIgnore;
import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.support.ExcelTypeEnum;
import com.alibaba.excel.util.ListUtils;
import com.alibaba.excel.write.metadata.WriteSheet;
import lombok.EqualsAndHashCode;
import lombok.Getter;
import lombok.Setter;
import org.apache.commons.io.FileUtils;

import java.io.File;
import java.io.IOException;
import java.util.Collection;
import java.util.Date;
import java.util.List;


public class TestEasyExcelAppend {

    public static void main(String[] args) throws IOException {
        File destFile = new File("D:\\data\\excel\\workbook-result.xls");

        if (destFile.exists()) {
            FileUtils.forceDelete(destFile);
        }
        for (int i = 0; i < 100; i++) {
            writeExcel(destFile, DemoData.class, data());
        }
    }

    private static void writeExcel(File destFile, Class type, Collection<?> data) throws IOException {
        FileUtils.forceMkdirParent(destFile);
        ExcelWriter excelWriter = null;
        if (destFile.exists()) {
            File tempFile = new File(destFile.getParent(), "workbook-temp.xls");
            if (tempFile.exists()){
                FileUtils.forceDelete(tempFile);
            }
            FileUtils.copyFile(destFile,tempFile);
            //追加数据，目标文件与原始文件不能是同一个文件名  withTemplate()指定模板文件
            excelWriter = EasyExcel.write().withTemplate(tempFile).excelType(ExcelTypeEnum.XLSX)
                    //.file() 指定目标文件，不能与模板文件是同一个文件
                    .file(destFile).autoCloseStream(false).build();
            doWrite(excelWriter, data);
            if (tempFile.exists()) {
                FileUtils.forceDelete(tempFile);
            }
        } else {
            excelWriter = EasyExcel.write(destFile, type).excelType(ExcelTypeEnum.XLSX)
                    .build();
            doWrite(excelWriter, data);
        }
    }

    private static void doWrite(ExcelWriter excelWriter, Collection<?> data) {
        try {
            WriteSheet writeSheet = EasyExcel.writerSheet("人员清单")
                    .build();
            excelWriter.write(data, writeSheet);
        } finally {
            // 千万别忘记finish 会帮忙关闭流
            if (null != excelWriter) {
                excelWriter.finish();
            }
        }
    }

    private static List<DemoData> data() {
        List<DemoData> list = ListUtils.newArrayList();
        for (int i = 0; i < 10000; i++) {
            DemoData data = new DemoData();
            data.setString("字符串" + i);
            data.setDate(new Date());
            data.setDoubleData(0.56);
            list.add(data);
        }
        return list;
    }
    /**
     * 基础数据类
     *
     * @author Jiaju Zhuang
     **/
    @Getter
    @Setter
    @EqualsAndHashCode
    public static class DemoData {
        @ExcelProperty("字符串标题")
        private String string;
        @ExcelProperty("日期标题")
        private Date date;
        @ExcelProperty("数字标题")
        private Double doubleData;
        /**
         * 忽略这个字段
         */
        @ExcelIgnore
        private String ignore;
    }

}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103