JAVA寫入數據到EXCEL的簡單DEMO

 

有些時候需要導出一些報表到EXCEL，下面介紹一個簡單的方法，封裝好工具類后只需要准備參數和路徑即可。

使用jxl,只能處理2003的excel(xls)

首先導入JAR包

<dependency>
    <groupId>net.sourceforge.jexcelapi</groupId>
    <artifactId>jxl</artifactId>
    <version>2.6.10</version>
</dependency>

 

    public static void writeExcel(List<Map<String, Object>> list, String path) {
        try {
            // Excel底部的表名
            String sheetn = "table1";
            // 用JXL向新建的文件中添加內容
            File myFilePath = new File(path);
            if (!myFilePath.exists())
                myFilePath.createNewFile();
            OutputStream outf = new FileOutputStream(path);
            WritableWorkbook wwb = Workbook.createWorkbook(outf);
            jxl.write.WritableSheet writesheet = wwb.createSheet(sheetn, 1);
            // 設置標題
            if (list.size() > 0) {
                int j = 0;
                for (Entry<String, Object> entry : list.get(0).entrySet()) {
                    String title = entry.getKey();
                    writesheet.addCell(new Label(j, 0, title));
                    j++;
                }
            }
            // 內容添加
            for (int i = 1; i <= list.size(); i++) {
                int j = 0;
                for (Entry<String, Object> entry : list.get(i - 1).entrySet()) {
                    Object o = entry.getValue();
                    if (o instanceof Double) {
                        writesheet.addCell(new jxl.write.Number(j, i, (Double) entry.getValue()));
                    } else if (o instanceof Integer) {
                        writesheet.addCell(new jxl.write.Number(j, i, (Integer) entry.getValue()));
                    } else if (o instanceof Float) {
                        writesheet.addCell(new jxl.write.Number(j, i, (Float) entry.getValue()));
                    } else if (o instanceof Float) {
                        writesheet.addCell(new jxl.write.DateTime(j, i, (Date) entry.getValue()));
                    } else if (o instanceof BigDecimal) {
                        writesheet.addCell(new jxl.write.Number(j, i, ((BigDecimal) entry
                                .getValue()).doubleValue()));
                    } else if (o instanceof Long) {
                        writesheet.addCell(new jxl.write.Number(j, i, ((Long) entry.getValue())
                                .doubleValue()));
                    } else {
                        writesheet.addCell(new Label(j, i, (String) entry.getValue()));
                    }
                    j++;
                }
            }
            wwb.write();
            wwb.close();
        } catch (WriteException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

 

將它封裝到工具類中，再調用，如下：

    public static void main(String[] args) {
        //數據准備
        List<Map<String, Object>> list = new ArrayList<>();
        for (int i = 0; i < 1000; i++) {
            Map<String, Object> map = new LinkedHashMap<>();
            map.put("ID", i+1000);
            map.put("姓名", "NAME"+i);
            map.put("地址", "address"+(i*2));
            list.add(map);
        }
        //存放路徑
        String path;
        try {
            //獲取項目的路徑
            path = Class.class.getClass().getResource("/").getPath();
            System.out.println(path);
            //路徑轉換下格式
            path = path.replaceAll("classes", "excel").concat("Test").concat(".xls");
            System.out.println(path);
            //寫入到excel
            writeExcel(list, path);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

控制台輸出路徑：

效果如圖：