我正在尝试将Excel数据转换为JSON格式。但是问题是我有链接到多个Excel工作表的Excel工作表。例如包含以下内容的示例root.xlsx ID，名称，电话，部门，类别，年龄字段 部门字段是指Department.xlsx，其中包含 dname，dtype，dtype 和类别字段是指category.xlsx，其中包含 catid，catname，cattype，
如果数据格式是这样，如何将其转换为JSON？
答案 0 :(得分：0)
需要装瓶
commons-beanutils-1.8.3.jar
ezmorph-1.0.6.jar
commons-collections-3.2.1.jar
commons-lang-2.6.jar
json-lib-2.4-jdk15.jar
poi
示例代码
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Header;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.openqa.selenium.json.Json;
import com.google.gson.Gson;
import com.google.gson.stream.JsonReader;
import net.sf.json.JSONObject;
public class ReadExcelDataWithDynamicColumn {
public static void main(String[] args)
{
// You can specify your excel file path.
String excelFilePath = "/Users/zhaosong/Documents/WorkSpace/EmployeeInfo.xls";
// This method will read each sheet data from above excel file and create a JSON and a text file to save the sheet data.
creteJSONAndTextFileFromExcel(excelFilePath);
}
/* Read data from an excel file and output each sheet data to a json file and a text file.
* filePath : The excel file store path.
* */
private static void creteJSONAndTextFileFromExcel(String filePath)
{
try{
/* First need to open the file. */
FileInputStream fInputStream = new FileInputStream(filePath.trim());
/* Create the workbook object to access excel file. */
//Workbook excelWookBook = new XSSFWorkbook(fInputStream)
/* Because this example use .xls excel file format, so it should use HSSFWorkbook class. For .xlsx format excel file use XSSFWorkbook class.*/;
Workbook excelWorkBook = new HSSFWorkbook(fInputStream);
// Get all excel sheet count.
int totalSheetNumber = excelWorkBook.getNumberOfSheets();
// Loop in all excel sheet.
for(int i=0;i<totalSheetNumber;i++)
{
// Get current sheet.
Sheet sheet = excelWorkBook.getSheetAt(i);
// Get sheet name.
String sheetName = sheet.getSheetName();
if(sheetName != null && sheetName.length() > 0)
{
// Get current sheet data in a list table.
List<List<String>> sheetDataTable = getSheetDataList(sheet);
// Generate JSON format of above sheet data and write to a JSON file.
String jsonString = getJSONStringFromList(sheetDataTable);
String jsonFileName = sheet.getSheetName() + ".json";
writeStringToFile(jsonString, jsonFileName);
// Generate text table format of above sheet data and write to a text file.
String textTableString = getTextTableStringFromList(sheetDataTable);
String textTableFileName = sheet.getSheetName() + ".txt";
writeStringToFile(textTableString, textTableFileName);
}
}
// Close excel work book object.
excelWorkBook.close();
}catch(Exception ex){
System.err.println(ex.getMessage());
}
}
/* Return sheet data in a two dimensional list.
* Each element in the outer list is represent a row,
* each element in the inner list represent a column.
* The first row is the column name row.*/
private static List<List<String>> getSheetDataList(Sheet sheet)
{
List<List<String>> ret = new ArrayList<List<String>>();
// Get the first and last sheet row number.
int firstRowNum = sheet.getFirstRowNum();
int lastRowNum = sheet.getLastRowNum();
if(lastRowNum > 0)
{
// Loop in sheet rows.
for(int i=firstRowNum; i<lastRowNum + 1; i++)
{
// Get current row object.
Row row = sheet.getRow(i);
// Get first and last cell number.
int firstCellNum = row.getFirstCellNum();
int lastCellNum = row.getLastCellNum();
// Create a String list to save column data in a row.
List<String> rowDataList = new ArrayList<String>();
// Loop in the row cells.
for(int j = firstCellNum; j < lastCellNum; j++)
{
// Get current cell.
Cell cell = row.getCell(j);
// Get cell type.
int cellType = cell.getCellType();
if(cellType == CellType.NUMERIC.getCode())
{
double numberValue = cell.getNumericCellValue();
// BigDecimal is used to avoid double value is counted use Scientific counting method.
// For example the original double variable value is 12345678, but jdk translated the value to 1.2345678E7.
String stringCellValue = BigDecimal.valueOf(numberValue).toPlainString();
rowDataList.add(stringCellValue);
}else if(cellType == CellType.STRING.getCode())
{
String cellValue = cell.getStringCellValue();
rowDataList.add(cellValue);
}else if(cellType == CellType.BOOLEAN.getCode())
{
boolean numberValue = cell.getBooleanCellValue();
String stringCellValue = String.valueOf(numberValue);
rowDataList.add(stringCellValue);
}else if(cellType == CellType.BLANK.getCode())
{
rowDataList.add("");
}
}
// Add current row data list in the return list.
ret.add(rowDataList);
}
}
return ret;
}
/* Return a JSON string from the string list. */
private static String getJSONStringFromList(List<List<String>> dataTable)
{
String ret = "";
if(dataTable != null)
{
int rowCount = dataTable.size();
if(rowCount > 1)
{
// Create a JSONObject to store table data.
JSONObject tableJsonObject = new JSONObject();
// The first row is the header row, store each column name.
List<String> headerRow = dataTable.get(0);
int columnCount = headerRow.size();
// Loop in the row data list.
for(int i=1; i<rowCount; i++)
{
// Get current row data.
List<String> dataRow = dataTable.get(i);
// Create a JSONObject object to store row data.
JSONObject rowJsonObject = new JSONObject();
for(int j=0;j<columnCount;j++)
{
String columnName = headerRow.get(j);
String columnValue = dataRow.get(j);
rowJsonObject.put(columnName, columnValue);
}
tableJsonObject.put("Row " + i, rowJsonObject);
}
// Return string format data of JSONObject object.
ret = tableJsonObject.toString();
}
}
return ret;
}
/* Return a text table string from the string list. */
private static String getTextTableStringFromList(List<List<String>> dataTable)
{
StringBuffer strBuf = new StringBuffer();
if(dataTable != null)
{
// Get all row count.
int rowCount = dataTable.size();
// Loop in the all rows.
for(int i=0;i<rowCount;i++)
{
// Get each row.
List<String> row = dataTable.get(i);
// Get one row column count.
int columnCount = row.size();
// Loop in the row columns.
for(int j=0;j<columnCount;j++)
{
// Get column value.
String column = row.get(j);
// Append column value and a white space to separate value.
strBuf.append(column);
strBuf.append(" ");
}
// Add a return character at the end of the row.
strBuf.append("\r\n");
}
}
return strBuf.toString();
}
/* Write string data to a file.*/
private static void writeStringToFile(String data, String fileName)
{
try
{
// Get current executing class working directory.
String currentWorkingFolder = System.getProperty("user.dir");
// Get file path separator.
String filePathSeperator = System.getProperty("file.separator");
// Get the output file absolute path.
String filePath = currentWorkingFolder + filePathSeperator + fileName;
// Create File, FileWriter and BufferedWriter object.
File file = new File(filePath);
FileWriter fw = new FileWriter(file);
BufferedWriter buffWriter = new BufferedWriter(fw);
// Write string data to the output file, flush and close the buffered writer object.
buffWriter.write(data);
buffWriter.flush();
buffWriter.close();
System.out.println(filePath + " has been created.");
}catch(IOException ex)
{
System.err.println(ex.getMessage());
}
}
}
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