效果

用法

String jsonStr = "{\"name\":\"aaa\",\"children\":[{\"name\":\"bbb\",\"children\":[{\"name\":\"eee\"},{\"name\":\"fff\",\"children\":[{\"name\":\"iii\"},{\"name\":\"jjj\",\"children\":[{\"name\":\"qqq\"},{\"name\":\"ttt\"}]}]},{\"name\":\"www\"}]},{\"name\":\"ccc\",\"children\":[{\"name\":\"ggg\"},{\"name\":\"hhh\",\"children\":[{\"name\":\"kkk\",\"children\":[{\"name\":\"ttt\"},{\"name\":\"mmm\"}]},{\"name\":\"uuu\"}]},{\"name\":\"ooo\"}]},{\"name\":\"ddd\",\"children\":[{\"name\":\"ggg\"},{\"name\":\"hhh\",\"children\":[{\"name\":\"kkk\"},{\"name\":\"uuu\"}]}]}]}";
Map tree = JSONObject.parseObject(jsonStr, Map.class);
tree2Excel(tree, "E:\\" + System.currentTimeMillis() + ".xls", "name", "children");

源码
 

package pers.xxx.demo.tree2excel;import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;import java.io.Closeable;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import java.util.Map;/*** 树形结构数据导出excel工具* <p>* Created by lzy on 2021/2/24 14:09*/
@SuppressWarnings("ALL")
public class Tree2ExcelUtil {/*** 树形结构数据生成excel文件** @param tree     树形数据* @param filePath 文件路径* @return*/public static boolean tree2Excel(Map tree, String filePath) {return tree2Excel(tree, filePath, null, null);}/*** 树形结构数据生成excel文件** @param tree         树形数据* @param filePath     文件路径* @param lableName    标签Key名称* @param childrenName 子节点Key名称* @return*/public static boolean tree2Excel(Map tree, String filePath, String lableName, String childrenName) {if (isBlank(filePath)) {System.err.println("文件名称不能为空");return false;}try {doSame(tree, lableName, childrenName);createExcel(filePath, tree);return true;} catch (IOException e) {e.printStackTrace();}return false;}/*** 树形结构数据生成Workbook对象** @param tree    树形数据* @param fileSuf 文件后缀，xls/xlsx* @return*/public static Workbook tree2Worbook(Map tree, String fileSuf) {return tree2Worbook(tree, fileSuf, null, null);}/*** 树形结构数据生成Workbook对象** @param tree         树形数据* @param fileSuf      文件后缀，xls/xlsx* @param lableName    标签Key名称* @param childrenName 子节点Key名称* @return*/public static Workbook tree2Worbook(Map tree, String fileSuf, String lableName, String childrenName) {if (isBlank(fileSuf)) {System.err.println("必须指定文件后缀");return null;}try {doSame(tree, lableName, childrenName);return procesData(tree, fileSuf);} catch (Exception e) {e.printStackTrace();}return null;}//具体实现/*** 标识最大列*/private static int maxCol = 0;private static String lableName = "lable";private static String childrenName = "children";private static final String COL = "col";private static final String ROW = "row";private static final String ROW_OFT = "rowOft";private static final String ROW_SIZE = "rowSize";private static void doSame(Map tree, String lableName, String childrenName) {if (!isBlank(lableName)) {Tree2ExcelUtil.lableName = lableName;}if (!isBlank(childrenName)) {Tree2ExcelUtil.childrenName = childrenName;}coreAlgoCol(tree, 1);coreAlgoRow(tree);}/*** 主要算法，计算列的坐标，计算每个节点所占行** @param tree  数据* @param col   递增的列* @param trees 把高级别向下传递计算递增的行高*/private static void coreAlgoCol(Map tree, int col, Map... trees) {tree.put(COL, col);Object childrenObj = tree.get(childrenName);if (childrenObj != null) {List<Map> children = (List<Map>) childrenObj;if (children.size() > 0) {int size = children.size() * 2 - 1;tree.put(ROW_SIZE, size);int len = trees != null ? trees.length + 1 : 1;Map[] arrData = new Map[len];if (trees != null && trees.length > 0) {for (int i = 0; i < trees.length; i++) {Map tree1 = trees[i];tree1.put(ROW_SIZE, toInt(tree1.get(ROW_SIZE), 1) + size - 1);arrData[i] = tree1;}}arrData[len - 1] = tree;for (Map tree1 : children) {int newCol = col + 1;if (newCol > maxCol) {maxCol = newCol;}coreAlgoCol(tree1, newCol, arrData);}}}}/*** 主要算法，计算行的坐标** @param tree*/private static void coreAlgoRow(Map tree) {if (toInt(tree.get(ROW)) == 0) {tree.put(ROW, Math.round(toInt(tree.get(ROW_SIZE), 1) / 2.0f));}Object childrenObj = tree.get(childrenName);if (childrenObj != null) {List<Map> children = (List<Map>) childrenObj;if (children.size() > 0) {int tempOft = toInt(tree.get(ROW_OFT));for (Map tree1 : children) {int rowSize = toInt(tree1.get(ROW_SIZE), 1);tree1.put(ROW_OFT, tempOft);tree1.put(ROW, tempOft + Math.round(rowSize / 2.0f));tempOft += rowSize + 1;coreAlgoRow(tree1);}}}}/*** 创建excel文件** @param filePath 文件路径，具体路径到文件名* @param tree     数据* @throws IOException*/private static void createExcel(String filePath, Map tree) throws IOException {File file = new File(filePath);boolean bfile = file.createNewFile();// 复制模板到新文件if (bfile) {Workbook wk = procesData(tree, filePath);if (wk != null) {FileOutputStream fos = null;try {fos = new FileOutputStream(file);wk.write(fos);fos.flush();} finally {closeStream(fos);wk.close();}}}}/*** 处理excel数据** @param tree 数据* @return 工作表对象*/private static Workbook procesData(Map tree, String fileName) {Workbook wk = null;if (fileName.endsWith("xls")) {wk = new HSSFWorkbook();}if (fileName.endsWith("xlsx")) {wk = new XSSFWorkbook();}if (wk == null) {System.err.println("文件名称不正确");return null;}//创建一个sheet页Sheet sheet = wk.createSheet("Sheet1");int colSize = maxCol * 2 + 2;int rowSize = toInt(tree.get(ROW_SIZE), 1);for (int i = 0; i <= rowSize; i++) {Row row = sheet.createRow(i);for (int j = 0; j <= colSize; j++) {row.createCell(j);}}//配置单元格背景色CellStyle style1 = wk.createCellStyle();style1.setFillForegroundColor(IndexedColors.LIGHT_GREEN.getIndex());style1.setFillPattern(FillPatternType.SOLID_FOREGROUND);CellStyle style2 = wk.createCellStyle();style2.setFillForegroundColor(IndexedColors.LIGHT_YELLOW.getIndex());style2.setFillPattern(FillPatternType.SOLID_FOREGROUND);dealCell(sheet, tree, style1, style2);return wk;}/*** 根据计算好的坐标填充每一个单元格** @param sheet  #* @param tree   数据* @param style1 单元格格式* @param style2 单元格格式*/private static void dealCell(Sheet sheet, Map tree, CellStyle style1, CellStyle style2) {Row row = sheet.getRow(toInt(tree.get(ROW)));int oftCol = (toInt(tree.get(COL)) - 1) * 2 + 1;Cell cell = row.getCell(oftCol);cell.setCellStyle(style1);cell.setCellValue(String.valueOf(tree.get(lableName)));sheet.setColumnWidth(oftCol, 256 * 20);Object childrenObj = tree.get(childrenName);if (childrenObj != null) {List<Map> children = (List<Map>) childrenObj;if (children.size() > 0) {int size = children.size();int startRow = toInt(children.get(0).get(ROW));int endRow = toInt(children.get(size - 1).get(ROW));int col = oftCol + 1;sheet.setColumnWidth(col, 256);for (; startRow <= endRow; startRow++) {sheet.getRow(startRow).getCell(col).setCellStyle(style2);}for (Map child : children) {dealCell(sheet, child, style1, style2);}}}}private static int toInt(Object val) {return toInt(val, 0);}private static int toInt(Object val, Integer defVal) {try {return Integer.parseInt(String.valueOf(val));} catch (NumberFormatException ignored) {}return defVal;}private static boolean isBlank(String str) {return str == null || str.trim().length() == 0;}/*** 关闭流** @param closeables 不定长数组 流对象*/public static void closeStream(Closeable... closeables) {for (Closeable closeable : closeables) {if (closeable != null) {try {closeable.close();} catch (IOException e) {e.printStackTrace();}}}}}