如何在java中将文件txt拆分为数组

Question

大家好，如何从文件 txt 中拆分字符串

例如我有文件 服务器.txt

192.168.1.2,80
192.168.1.3,3306

然后我想将 192.168.1.2 192.168.1.3 拆分为 String[] ipserver 然后拆分 80,3306 String[] 端口 并且输出打印所有阵列 ipserver 并打印所有阵列端口 这是我的代码：

String csvFile = "c:/Users/user/Desktop/in.txt";
    String line = "";



    try (BufferedReader br = new BufferedReader(new FileReader(csvFile))) {

        while ((line = br.readLine()) != null) {

            // use comma as separator
            String[] ipserver = line.split(";|,");
            String[] port = line.split(",|;");  
                    System.out.println( ipserver[i] );
                    System.out.println( port[i] );


        }

    } catch (IOException e) {
    }

请各位大侠帮帮忙，谢谢

Answer 1

这应该可以解决问题：

List<String> ipServerList = new LinkedList();
List<String> portList = new LinkedList();
while ((line = br.readLine()) != null) {
    String[] values = line.split(";|,")
    ipServerList.add(values[0]);
    portList.add(values[1]);
}
String[] ipServers = ipServerList.toArray(new String[ipServerList.size()]);
String[] ports = portList.toArray(new String[portList.size()]);

我们创建两个Lists 来存储值。最后我们将它们转换为数组

Answer 2

如果你只想在分割字符串的过程中打印..

while ((line = br.readLine()) != null) {
            // use comma as separator
            String[] ipNport = line.split(","); 
            System.out.println( ipNport[0] );
            System.out.println( ipNport[1] );
        }

Answer 3

这样做：

String toSplit = Files.lines(Paths.get("c:\\Users\\user\\Desktop\\in.txt")).collect(Collectors.joining("\n"));
           String[] ipserver = null, port = null;

        ArrayList<String> ipServerAl = new ArrayList<>();
        ArrayList<String> portAl = new ArrayList<>();
    String[] ipPortPairList = toSplit.split("\\r\\n");

    for (String ipPortPair : ipPortPairList) {
        ipServerAl.add(ipPortPair.split(",")[0]);
        portAl.add(ipPortPair.split(",")[1]);
    }

    ipserver = ipServerAl.toArray(new String[ipServerAl.size()]);
    port = portAl.toArray(new String[portAl.size()]);

Answer 4

1. 了解如何使用字符串的拆分功能。访问以下链接：

https://docs.oracle.com/javase/7/docs/api/java/lang/String.html#split(java.lang.String)

2.

一个。如果您只想打印到控制台，请按照@Rakibul Haq 的回答。

b.如果您想稍后存储/处理它，请按照@Shanu gupta 的回答。 湾。如果您从 CSV 文件中读取它。使用 apache poi 库： https://poi.apache.org/（我认为你是 Java 新手，所以至少现在可能很难）

c。从 .txt 文件中读取。你做对了。恭喜！

下面是一个工作代码：

package com.bt.neweserve.agent.controller;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

    public class A {

    public static void main(String[] args) throws IOException {

        String csvFile = "c:/Users/611654029/Desktop/in.txt";
        String line = "";
        BufferedReader br = new BufferedReader(new FileReader(csvFile));

        // Using lists from Collections framework. Note: Dynamic array. Size is not
        // defined, it is dynamic.
        List<String> ipList = new ArrayList<String>();
        List<String> portList = new ArrayList<String>();
        while ((line = br.readLine()) != null) {
            String[] result = line.split(",");
            ipList.add(result[0]);
            portList.add(result[1]);
        }

        br.close();
        System.out.println("Using dynamic array ie ArrayList");
        System.out.println(ipList);
        System.out.println(portList);

        // using array. Size is defined/constant.

        br = new BufferedReader(new FileReader(csvFile));
        String[] ipListArray = new String[10]; // assuming you have 10 lines in the file.
        String[] portListArray = new String[10];

        int i = 0; // Initial index of the array.
        while ((line = br.readLine()) != null) {
            String[] result = line.split(",");
            ipListArray[i] = result[0];
            portListArray[i] = result[1];
            i++; // Note the increment of array index
        }
        br.close();
        System.out.println("Using static array i.e. array of predefined size");
        System.out.println(Arrays.toString(ipListArray));
        System.out.println(Arrays.toString(portListArray));
    }
    }

希望这会有所帮助。