java - 读取缓冲区中的csv，检查是否通过检查 -> 将信息逐行转发到方法

Question

在我的程序中，我可以读取 csv 文件。我逐行将信息解析为方法。但是如果 csv 没有通过 if 检查，我不想调用“otherMethod(id, new);”根本不。因此，在调用 otherMethod 之前，必须传递整个 CSV。

所以我的问题是:如何在某种缓冲区中读取整个 csv，检查它是否通过 if 检查并随后处理它(逐行)？

boolean csvPassed = true;
int index = 0;
double id = Double.NaN, new = Double.NaN;

while ((String line = reader.readLine()) != null) {
    Scanner scanner = new Scanner(line); 
    scanner.useDelimiter(";"); 
    while (scanner.hasNext()) { 
        //check the csv line by line
        if (index == 0) 
            id = Integer.parseInt(data);
        else if (index == 1) {
            new = Integer.parseInt(data); 
            if (new == 10)
                  csvPassed = false
        }
        //whatever you want to do here
    }
}

//after the file is checked
if(csvPassed){
    // If the csv passes the check, call the method line by line...
    otherMethod(id, new);
}

Answer 1

这可能对你有帮助。

BufferedReader reader = new BufferedReader(new FileReader("<YOUR_FILENAME>"));
//your buffer to store the lines of your csv
List<Integer[]> lines = new LinkedList<>();
//a flag to indicate the success
boolean passed = true;
//read in the file line by line
String currentLine;
while((currentLine = reader.readLine()) != null){
    //split the line up at your delimiter
    String[] lineSplit = currentLine.split(";");
    //the array to store the parsed integers of the current line
    Integer[] parsedLine = new Integer[lineSplit.length];

    //process each element of that line and check for your condition
    for(int i = 0; i < lineSplit.length; i++){
        //make sure you can parse that string
        parsedLine[i] = Integer.parseInt(lineSplit[i]);
        if(parsedLine[i] == 10){
            //Maybe you could also exit your loop here and clear the list?
            passed = false;
        }
    }
    //add this line to your buffer
    lines.add(parsedLine);
}

//If all lines passed the condition, process line by line out of your buffer
if(passed){
    //make sure you have the 2 values in the array
    for(Integer[] line : lines){
        otherMethod(line[0], line[1]);
    }
}