xlsx2json2file

你的名字 2023-03-03 06:29 8阅读 0赞

使用 POI 实现解析 xlsx 转换成 json 写入文件

Maven 依赖

<dependency>
          <groupId>org.apache.poi</groupId>
          <artifactId>poi</artifactId>
          <version>3.14</version>
        </dependency>
        <dependency>
          <groupId>org.apache.poi</groupId>
          <artifactId>poi-ooxml</artifactId>
          <version>3.14</version>
        </dependency>
    
        
        <dependency>
          <groupId>com.fasterxml.jackson.core</groupId>
          <artifactId>jackson-databind</artifactId>
          <version>2.9.3</version>
        </dependency>
        
        <dependency>
          <groupId>com.fasterxml.jackson.core</groupId>
          <artifactId>jackson-core</artifactId>
          <version>2.9.3</version>
        </dependency>
        
        <dependency>
          <groupId>com.fasterxml.jackson.core</groupId>
          <artifactId>jackson-annotations</artifactId>
          <version>2.9.3</version>
        </dependency>

public static void main(String[] args) throws IOException {
            Workbook wb = null;
            Sheet sheet = null;
            Row row = null;
            List<Map<String, String>> list = null;
            String cellData = null;
            String filePath = "F:\\workSpace\\IdeaProjects\\c_working\\asiainfo\\eda\\excel2json\\src\\main\\java\\a.xlsx";
            String[] columns = {"channel_name", "polygon_id", "point_order", "lng", "lat"};
            wb = readExcel(filePath);
            if (wb != null) {
                //用来存放表中数据
                list = new ArrayList<>();
                //获取第一个sheet
                sheet = wb.getSheetAt(0);
                //获取最大行数
                int rownum = sheet.getPhysicalNumberOfRows();
                //获取第一行
                row = sheet.getRow(0);
                //获取最大列数
                int colnum = row.getPhysicalNumberOfCells();
                // String initName = sheet.getRow(1).getCell(0).getStringCellValue() + "-" + new Double(sheet.getRow(1).getCell(1).getNumericCellValue()).intValue() + "";
                String initName = "";
                ArrayList<Object> list3 = new ArrayList<>();
                ArrayList<Double> list4 = null;
                for (int i = 1; i < rownum; i++) {
                    list4 = new ArrayList<>();
                    row = sheet.getRow(i);
                    String name = row.getCell(0).getStringCellValue() + "-" + new Double(row.getCell(1).getNumericCellValue()).intValue() + "";
                    double lng = row.getCell(3).getNumericCellValue();
                    double lat = row.getCell(4).getNumericCellValue();
                    System.out.println(initName + "?" + name);
                    list4.add(lng);
                    list4.add(lat);
    
                    if ("".equals(initName)) {
                        initName = name;
                    }
                    if (!initName.equals(name)) {
                        System.out.println("\r\n");
                        // json 第一层
                        Map<String, Object> fmap = new HashMap<>(16);
                        ArrayList<Object> features = new ArrayList<>();
                        fmap.put("type", "FeatureCollection");
    
                        Map<String, Object> propertiesMap = new HashMap<>(16);
                        propertiesMap.put("name", "urn:ogc:def:crs:OGC:1.3:CRS84");
                        Map<String, Object> crsMap = new HashMap<>(16);
                        crsMap.put("type", "name");
                        crsMap.put("properties", propertiesMap);
                        fmap.put("crs", crsMap);
    
                        Map<String, Object> featureMap = new HashMap<>(16);
                        featureMap.put("type", "Feature");
                        Map<String, Object> fpMap = new HashMap<>(1);
    
                        Map<String, Object> geometryMap = new HashMap<>(16);
                        geometryMap.put("type", "MultiPolygon");
    
                        fmap.put("name", initName);
                        fpMap.put("NAME", initName);
                        featureMap.put("properties", fpMap);
                        ArrayList<Object> list1 = new ArrayList<>();
                        ArrayList<Object> list2 = new ArrayList<>();
    
                        list3.add(list3.get(0));
                        list2.add(list3);
                        list1.add(list2);
    
                        geometryMap.put("coordinates", list1);
                        featureMap.put("geometry", geometryMap);
    
                        System.out.println("换下个文件写出");
                        features.add(featureMap);
                        fmap.put("features", features);
                        ObjectMapper mapper = new ObjectMapper();
                        String s = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(fmap);
                        System.out.println(initName + ":" + list3.size());
                        list3.clear();
                        list3.add(list4);
    
                        File file = new File(initName + ".geojson");
                        if (!file.exists()) {
                            file.createNewFile();
                        }
                        //使用true，即进行append file
                        FileWriter fileWritter = new FileWriter(file.getName(), false);
                        fileWritter.write(s);
                        fileWritter.close();
                        initName = name;
    
                    }else{
                        list3.add(list4);
                    }
                }
            }
        }
    
        //读取excel
        public static Workbook readExcel(String filePath) {
            Workbook wb = null;
            if (filePath == null) {
                return null;
            }
            String extString = filePath.substring(filePath.lastIndexOf("."));
            InputStream is = null;
            try {
                is = new FileInputStream(filePath);
                if (".xls".equals(extString)) {
                    return wb = new HSSFWorkbook(is);
                } else if (".xlsx".equals(extString)) {
                    return wb = new XSSFWorkbook(is);
                } else {
                    return wb = null;
                }
    
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return wb;
        }