什么是树形结构数据
效果
用法
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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
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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(); } } } } } |
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原文链接：https://blog.csdn.net/LZY_1993/article/details/114083456
