我们可以在CSV中添加新列作为最后一列，假设其中已经包含3列数据了吗？因此，此新列将稍后添加为第4列，并且每行应具有随机数。
示例
<?php
/*
* Following code will create a new product row
* All product details are read from HTTP Post Request
*/
// array for JSON response
$response = array();
// check for required fields
if ( isset($_REQUEST["eng_name"]) && isset($_REQUEST["cls"]) && isset($_REQUEST["phone"]) && isset($_REQUEST["ic"]) && isset($_REQUEST["schoolID"]) && isset($_REQUEST["chi_name"]) && isset($_REQUEST["email"]) && isset($_REQUEST["address"]) && isset($_REQUEST["isMember"]) ) {
$eng_name = $_REQUEST['eng_name'];
$class = $_REQUEST['cls'];
$phone = $_REQUEST['phone'];
$nationalcard = $_REQUEST['ic'];
$schoolID = $_REQUEST['schoolID'];
$chi_name = $_REQUEST['chi_name'];
$ID = $_REQUEST['ID'];
$email = $_REQUEST['email'];
$address = $_REQUEST['address'];
$isMember = $_REQUEST['isMember'];
// include db connect class
require_once __DIR__ . '/db_connect.php';
// connecting to db
$db = new DB_CONNECT();
// mysql inserting a new row
$result = mysql_query("INSERT INTO list(eng_name, class, phone, ic, schoolID, chi_name, ID, email, address, isMember) VALUES('$eng_name', '$class', '$phone', '$nationalcard', '$schoolID', '$chi_name', '$ID', '$email', '$address', '$isMember')");
// check if row inserted or not
if ($result) {
// successfully inserted into database
$response["success"] = 1;
$response["message"] = "Entry successfully created.";
// echoing JSON response
echo json_encode($response);
} else {
// failed to insert row
$response["success"] = 0;
$response["message"] = "Oops! An error occurred. Contact Tenent or ImJustChew";
// echoing JSON response
echo json_encode($response);
}
} else {
// required field is missing
$response["success"] = 0;
$response["message"] = "Required field(s) is missing";
// echoing JSON response
echo json_encode($response);
}
?>
据我所知，这将需要首先读取csv，因为循环可能会迭代到最后一列，然后添加一个新的计算列，即写入csv。要增加值，可以是Java的Random类。但是，究竟该怎么做才是真正的问题。像样例代码会有所帮助。
代码：
Id Name Address Calculated
1 John U.K. 341679
2 Vj Aus 467123
3 Scott U.S. 844257
答案 0 :(得分：2)
太好了，因此根据您提供的代码，看起来可能如下所示
（只是为了给您一个主意-我在没有测试的情况下即时将其写在这里...） ：
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
public class Demo1 {
//moved your random generator here
public static String getRandomNumber() {
/* Code to generate random number */
String CHARS = "1234567890";
StringBuilder random = new StringBuilder();
Random rnd = new Random();
while (random.length() < 18) { // length of the random string.
int index = (int) (rnd.nextFloat() * CHARS.length());
random.append(CHARS.charAt(index));
}
String finaldata = random.toString();
return finaldata;
}
public static void main(String[] args) throws IOException {
String csvFile = "C:\\MyData\\Input.csv";
String temporaryCsvFile = "C:\\MyData\\Output_temp.csv";
String line = "";
String cvsSplitBy = ",";
String newColumn = "";
List<String> aobj = new ArrayList<String>();
/* Code to read Csv file and split */
BufferedWriter writer = new BufferedWriter(new FileWriter(
temporaryCsvFile));
try (BufferedReader br = new BufferedReader(new FileReader(csvFile))) {
while ((line = br.readLine()) != null)
{
//String[] csvData = line.split(cvsSplitBy);
//int arrayLength = csvData.length;
//actually you don't even need to split anything
String newFileLine = line + cvsSplitBy + getRandomNumber();
// ... We call newLine to insert a newline character.
writer.write(newFileLine);
writer.newLine();
}
}
writer.close();
//Now delete the old file and rename the new file
//I'll leave this to you
}
}
答案 1 :(得分：0)
基于@Plirkee示例代码和他的帮助，我编写了最终的工作代码。在此处共享它，以便对有类似要求的人有用。
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Random;
public class Demo1 {
public static String getRandomNumber() {
String CHARS = "1234567890";
StringBuilder random = new StringBuilder();
Random rnd = new Random();
while (random.length() < 18) // length of the random string.
{
int index = (int) (rnd.nextFloat() * CHARS.length());
random.append(CHARS.charAt(index));
}
String finaldata = random.toString();
return finaldata;
}
public static void main(String[] args) throws IOException {
File sourceCsvFile = null;
File finalCsvFile = null;
// String sourceCsvFileName = "";
sourceCsvFile = new File("C:\\MyData\\Input.csv");
finalCsvFile = new File("C:\\MyData\\Input_1.csv");
String line = "";
String cvsSplitBy = ",";
BufferedWriter writer = new BufferedWriter(new FileWriter(finalCsvFile));
try (BufferedReader br = new BufferedReader(new FileReader(sourceCsvFile))) // read the actual Source downloaded csv file
{
line = br.readLine(); // read only first line
String newFileLine = line + cvsSplitBy + "HashValue"; // append "," and new column <HashValue>
writer.write(newFileLine); // will be written as first line in new csv
writer.newLine(); // go to next line for writing next lines
while ((line = br.readLine()) != null) // this loop to write data for all lines except headers
{
newFileLine = line + cvsSplitBy + getRandomNumber(); // will add random numbers for each row
writer.write(newFileLine);
writer.newLine();
}
}
writer.close();
if(finalCsvFile.exists() && finalCsvFile.length() > 0)
{
System.out.println("New File with HashValue column created...");
if(sourceCsvFile.delete())
{
System.out.println("Old File deleted successfully...");
}
else
{
System.out.println("Failed to delete the Old file...");
}
}
else if (!finalCsvFile.exists())
{
System.out.println("New File with HashValue column not created...");
}
}
}