[英]Syntax error on token(s), misplaced construct(s)
如何修復此錯誤--->令牌上的語法錯誤,錯位的構造(s)錯誤位於下面指定的行。 注意:此代碼已在Web上復制並嘗試將其作為學習工具使用我正在使用Eclipse謝謝!
import java.io.File;
import java.io.FileOutputStream;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class EcellTest22 {
//Blank workbook
XSSFWorkbook workbook = new XSSFWorkbook();
//Create a blank sheet
XSSFSheet sheet = workbook.createSheet("Employee Data");
//This data needs to be written (Object[])
Map<String, Object[]> data = new TreeMap<String, Object[]>();
//
data.put("1", new Object[]{"ID","NAME", "LASTNAME"}); <--Syntax error on token(s), misplaced construct(s)
data.put("2", new Object[]{1, "Amit", "Shukla"});
data.put("3", new Object[]{2, "Lokesh", "Gupta"});
data.put("4", new Object[]{3, "John", "Adwards"});
data.put("5", new Object[]{4, "Brian", "Schultz"});
//Iterate over data and write to sheet
Set<String> keyset = data.keySet();
int rownum = 0;
for (String key : keyset)
{
//create a row of excelsheet
Row row = sheet.createRow(rownum++);
//get object array of prerticuler key
Object[] objArr = data.get(key);
int cellnum = 0;
for (Object obj : objArr)
{
Cell cell = row.createCell(cellnum++);
if (obj instanceof String)
{
cell.setCellValue((String) obj);
}
else if (obj instanceof Integer)
{
cell.setCellValue((Integer) obj);
}
}
}
try
{
//Write the workbook in file system
FileOutputStream out = new FileOutputStream(new File("C:\\Documents and Settings\\admin\\Desktop\\imp data\\howtodoinjava_demo.xlsx"));
workbook.write(out);
out.close();
System.out.println("howtodoinjava_demo.xlsx written successfully on disk.");
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
您需要將聲明后的所有語句放在代碼塊中,例如方法而不是類塊。 從邏輯上講,將所有語句放在代碼塊中可能是有意義的,但非聲明性語句需要包含在新塊中
private void processFile() {
data.put("1", new Object[]{"ID","NAME", "LASTNAME"}); // <--Syntax error
...//snip
} catch (Exception e) {
e.printStackTrace();
}
}
將所有代碼放在main方法中:
public static void main(String[] args) {
//All of your code goes here
}
語句(不包括聲明)必須在塊內執行。 您似乎正在對某些代碼進行測試,並且這並不是代碼中的實際對象,因此您必須將其放在main方法中。
問題解決了。 我在Eclipse中創建了一個新項目,將POI(jar)添加到庫中,不再顯示語法錯誤。
在任何方法中粘貼try和catch塊 。 以上問題你的try塊只在類中,這就是為什么你得到語法錯誤消息或深入學習嘗試
public void yourMethod(){
try
{
//Write the workbook in file system
FileOutputStream out = new FileOutputStream(new File("C:\\Documents and Settings\\admin\\Desktop\\imp data\\howtodoinjava_demo.xlsx"));
workbook.write(out);
out.close();
System.out.println("howtodoinjava_demo.xlsx written successfully on disk.");
}
catch (Exception e)
{
e.printStackTrace();
}
}
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