Question

我正在尝试编写一个逐行读取texfile的java程序，并将每一行存储在自己的数组中，以便这些行成为数据列。例如，下面的data.txt文件包含以下数据：

122,80,100,119,162,90,136 ...
122,80,100,119,162,90,136 ...
64,74,70,64,76,62,84,78 ......
积极，消极，消极......

我希望每一行都存储在自己的数组中，因此4行，4个不同的数组，因为每行都属于一个特定的列。我能够阅读文本文件。

BufferedReader br = new BufferedReader(new FileReader("C://data.txt"));
        ArrayList lines = new ArrayList();
        for(String line = br.readLine();line != null;line = br.readLine()) {
            line.replaceAll(",","\\.");
            String[] fields = line.split(" ");
            System.out.println(" " + fields[0]);
            lines.add(fields);
        }
        String[][] strings = (String[][]) lines.toArray(new String[lines.size()][]);
        System.out.println("Total Lines: " + strings.length);

这是预期的输出：

output

Answer 1

如果您想要特定阵列中的每一行，那么以下内容应该有帮助

BufferedReader br = new BufferedReader(new FileReader("C:\\data.txt"));
ArrayList lines = new ArrayList();
for(String line = br.readLine();line != null;line = br.readLine()) {
    //comma will be replaced with .
    line=line.replaceAll(",","\\.");
    //each line will be stored in an array with . as separator
    String[] fields = line.split("\\.");
    //System.out.println(" " + fields[0]);
    lines.add(fields);
}
String[][] strings = (String[][]) lines.toArray(new String[lines.size()][]);
System.out.println("Total Lines: " + strings.length);

//code to display
for(String s[]:strings){
    for(String ss:s){
        System.out.print(ss+", ");
    }System.out.println();
}

其输出

Total Lines: 4
122, 80, 100, 119, 162, 90, 136, 
122, 80, 100, 119, 162, 90, 136, 
64, 74, 70, 64, 76, 62, 84, 78 , 
positive, negative, negative ,

Answer 2

我认为这就是你所需要的：

$file = fopen("contacts.csv","a");

Java读取文本文件并将每一行存储到自己的数组中

2 个答案: