从文本读取/写入数据到Excel并根据条件打印下一个，上一个，当前行

Question

我有一个文本文件，根据某些关键字我必须读取该行并将该行写入excel文件。我这样做了，现在我需要读取下一行和上一行，并且这些行还需要写入不同列中的Excel表单。我怎样才能做到这一点。

rahul1.txt

ABCD1 abhishek1 duplicatevalue jgf 
ABCD2 abhishek2 duplicatevalue jgf 
ABCD3 abhishek3 duplicatevalue jgf 
ABCD4 abhishek4 duplicatevalue jgf 

while (st1.hasMoreTokens()) {String txt = st1.nextToken();if (txt.contains("abhishek2")) {l1.add(txt);} 

如何打印

ABCD1 abhishek1 duplicatevalue jgf prev Line 

和

ABCD3 abhishek3 duplicatevalue jgf Next Line 

在不同的列

？

Answer 1

import java.io.BufferedReader; 
import java.io.DataInputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileOutputStream;` 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.util.ArrayList; 
import java.util.Collection; 
import java.util.List; 
import org.apache.poi.hssf.usermodel.HSSFSheet; 
import org.apache.poi.hssf.usermodel.HSSFWorkbook; 
import org.apache.poi.ss.usermodel.Cell; 
import org.apache.poi.ss.usermodel.Row; 

public class ReadWrite { 
int rownum = 1; 
HSSFSheet firstSheet; 
Collection<File> files; 
HSSFWorkbook workbook; 
File exactFile; 
boolean retu; 
// BufferedReader reader = null; 
{ 
workbook = new HSSFWorkbook(); 
    firstSheet = workbook.createSheet("SampleSheet"); 
    Row headerRow = firstSheet.createRow(0); 
    // headerRow.createCell(0).setCellValue("#"); 
    headerRow.createCell(0).setCellValue("ID"); 
    headerRow.createCell(1).setCellValue(Message"); 
    headerRow.createCell(2).setCellValue("name"); 
    headerRow.createCell(3).setCellValue("address"); 
    headerRow.createCell(4).setCellValue("contact"); 
    headerRow.createCell(5).setCellValue("Next"); 
    headerRow.createCell(6).setCellValue("Prev"); 
} 
public static void main(String args[]) { 
    ReadWrite class2 = new ReadWrite(); 
    class2.readfile(); 
} 
void readfile() { 
    try { 

FileInputStream fInput = new FileInputStream(
       "D:\\Rahul\\rahul1.txt"); 

     DataInputStream dis = new DataInputStream(fInput); 

     BufferedReader br = new BufferedReader(new InputStreamReader(dis)); 

     String lineStr; 
     String prevStr = ""; 
     String nextStr = ""; 
     //List<String> l1 = new ArrayList<String>(); 
     int i; 
     int seqno = 1; 

     while ((lineStr = br.readLine()) != null) { 
      List<String> l1 = new ArrayList<String>(); 
      if (lineStr.contains("Oracle") 
        || lineStr.contains("SAP") 
        || lineStr.contains("J2EE")) { 


       l1.add("C1"); 
       l1.add(lineStr); 
       l1.add("M1"); 
       l1.add("R1"); 
       l1.add("V1"); 
       l1.add(nextStr); 
       l1.add(prevStr); 

      } else { 
       prevStr = lineStr; 
      } 

      try { 
       if (l1 != null && l1.size() > 0) 
        retu = writenameinsheet(l1); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
      seqno++; 
      i = 1; 
     }br.close(); 


      FileOutputStream fos = null; 
      try { 
       File excelFile = new File("D:\\Rahul\\rahul.xls"); 
       fos = new FileOutputStream(excelFile); 
       workbook.write(fos); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } finally { 
       if (fos != null) { 
        try { 
         fos.flush(); 
         fos.close(); 
        } catch (IOException e) { 
         e.printStackTrace(); 
        } 

        catch (Exception e) { 
         e.printStackTrace(); 
        } 
       } 
      } 

    } catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } finally { 
    } 

} 

boolean writenameinsheet(List<String> l1) throws Exception { 

    try { 
     Row row = firstSheet.createRow(rownum); 
     for (int j = 0; j < l1.size(); j++){ 

      Cell cell = row.createCell(j); 
      cell.setCellValue(l1.get(j)); 

     }rownum++; 

    } catch (Exception e) { 
     e.printStackTrace(); 
    } finally { 
    } 
    return true; 

} 

}