Question

我在数据库中有一个包含5列的表。在CSV文件中，我有如下数据。如何通过删除空列将其处理到Oracle数据库中（因为CSV文件包含6列，它将在具有5列的数据库列中不匹配）。

    111, ,John,2000,   ,US 
    222, ,Alle,3000,   ,China
    333, ,Kite,4000,LCD,IND
    444, ,King,5000,LED,Aust

package com.java;
import java.io.BufferedReader;
import java.io.FileReader;
import java.util.List;
import java.util.Vector;
public class Test3 
{
    public static void main(String[] args) 
    {
        try 
        {
            int commas = 0;
            List data = new Vector();
            List columnCount = new Vector();
            String[] cols = null;
            String[] strArray = null;
            String file = "D:/temp/CSV/data.csv";
            BufferedReader br = new BufferedReader(new FileReader(file));
            String line = br.readLine();
            do
            {       
                commas = 0;
                cols = line.split(",");
                strArray = new String[cols.length];
                int i=0;
                for (String element : cols) 
                {    
                    if (!isBlank(element))
                    {                   
                        strArray[i] = element;
                        i++;
                    }
                }
                int newFile = line.length();
                for(int k = 0; k < newFile; k ++ )
                {
                    char eachChar = line.charAt(k);         
                    if(eachChar == ',')
                    {
                        commas ++;
                    }
                }

                data.add(strArray); 
                line = br.readLine();           
            }
            while (line != null);       
            Vector columns = new Vector(commas + 1);
            for(int i = 0; i < commas +1 ; i ++ )
            {
                columns.add("" + i);               
            }
        } catch (Exception e) {

        }
    }
    public static boolean isBlank(String str) {
        int strLen;

        if (str == null || (strLen = str.length()) == 0) 
        {

            return true;
        }

        for (int i = 0; i < strLen; i++) 
        {
            if ((Character.isWhitespace(str.charAt(i)) == false)) {
                return false;
            }
        }
        return true;

    }

}

Answer 1

您可以使用util方法检查它是否为空字符串。

public static boolean isBlank(String str) {
        int strLen;
        if (str == null || (strLen = str.length()) == 0) {
            return true;
        }
        for (int i = 0; i < strLen; i++) {
            if ((Character.isWhitespace(str.charAt(i)) == false)) {
                return false;
            }
        }
        return true;
    }

并在您的阅读器中使用它，如下所示

Scanner s = null;
        try {
            s = new Scanner(new File("D:/sri/Test.txt"));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        while (s.hasNextLine()) {
            String[] line = s.nextLine().split(",");
            for (String element : line) {
                if (!isBlank(element))
                    System.out.println(element);
            }

        }

如果CSV文件包含空列，如何消除要插入到DB的空列？

1 个答案: