Java树形结构数据生成导出excel文件方法记录

什么是树形结构数据

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();

}

}

}

}

}

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