将输出保存到数组，然后写入.csv文件

Question

I have some code but i need help figuring out how to save the results of that if statement to an array, then saving it to a .csv file. Thanks in advance!

String data = new Scanner( new File("Test.csv") ).useDelimiter("\\A").next();
String terms = new Scanner( new File("Terms.txt") ).useDelimiter("\\A").next();

data.split(",");
terms.split("\n");

if (sourceElement.indexOf(dictionaryElement) > 0)
{
//Save results here
}
NameOfArray.join(",");
//Here I need to write the array to a .csv file... Help?

Also, I'm trying to use a text file full of keywords to search a csv file and save the results to a new csv file... Will this script even work? I'm fairly new to coding...

Answer 1

Try using this code:

//imports
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.util.ArrayList;
import java.util.List;

//create the array lists to save the data
private static List<String> readData = new ArrayList<String>();
private static List<String> readTerms = new ArrayList<String>();
private static List<String> splitData = new ArrayList<String>();
private static List<String> finalData = new ArrayList<String>();

public static void main(String[] args) throws Exception{
   readData();
   processData();
   writeFinalData();
}

public static void readData() throws Exception{
//create readers
BufferedReader data = new BufferedReader(new FileReader(new File("Test.csv")));
BufferedReader term = new BufferedReader(new FileReader(new File("Terms.txt")));

//read the data and save it into the array lists
String line;
while((line = term.readLine()) != null){
   readTerms.add(line);
}

while((line = data.readLine()) != null){
   readData.add(line);
}

//close the readers
data.close();
term.close();
}

Now we have two array lists witch hold the data from the .csv file and the data from the terms file. The next step is to process this data and write it to a file.

public static void processData(){
   //looping through every line in the .csv file, spliting it by , and saving every     piece of the data into a new array list
   for(String d : readData){
      String[] split = d.split(",");
      for(int i = 0; i < split.length; i++){
         splitData.add(split[i]);
      }
   }

//searching the .csv file for keywords
for(String s : splitData){
   for(String k : readTerms){
      //testing if the data from the .csv file contains (or is equal to) the keyword. If true then we add it to the array list which holds the final data that will be writen back to the file
      if(s.contains(k)){
         finalData.add(s);
      }
   }
}
}

The last thing left to do is to write the data that matches the keywords back to a file.

public static void writeFinalData() throws Exception{
   BufferedWriter bw = new BufferedWriter(new FileWriter(new File("words.txt")));

   for(String s : finalData){
      bw.write(s);
      bw.newLine();
   }

   bw.close();
}

Answer 2

Yes, you can use this loop instead:

   public static void writeFinalData() throws Exception{
   BufferedWriter bw = new BufferedWriter(new FileWriter(new File("words.txt")));
   String finalLine = "" ; 

   //merge all the data into one line and separate it by “,“
   for(String s : finalData){
      finalLine += s + ","; 
   }

   //remove the comma at the end of the line
   finalLine = finalLine.substring(0, finalLine.length() - 1);

   bw.write(finalLine);

   bw.close();
 }

Answer 3

Here you go. I had to change the whole program. :) Don't forget the imports again ;)

// create the array lists to save the data
private static List<String> readTerms = new ArrayList<String>();

private static BufferedWriter bw;

public static void main(String[] args) throws Exception {
    openWriter();
    readData();
    closeWriter();
}

public static void readData() throws Exception {
    // create readers
    BufferedReader data = new BufferedReader(new FileReader(new File(
            "Test.csv")));
    BufferedReader term = new BufferedReader(new FileReader(new File(
            "Terms.txt")));

    // read the data and save it into the array lists
    String line;
    while ((line = term.readLine()) != null) {
        readTerms.add(line);
    }

    while ((line = data.readLine()) != null) {
        processLine(line);
    }

    // close the readers
    data.close();
    term.close();
}

public static void processLine(String line) throws Exception{
    String[] splitLine = line.split(",");
    String finalLine = "";
    for(int i = 0; i < splitLine.length; i++){
    for(String k : readTerms){
        if(splitLine[i].contains(k)){
            finalLine += splitLine[i] + ",";
        }
    }
    }
    finalLine = finalLine.substring(0, finalLine.length() - 1);
    saveLine(finalLine);
}

public static void saveLine(String line) throws Exception{
    bw.write(line);
    bw.newLine();
}

public static void openWriter() throws Exception{
    bw = new BufferedWriter(new FileWriter(new File("words.txt")));
}

public static void closeWriter() throws Exception{
    bw.close();
}