JAVA在文本文件中显示重复的某些值 [英] JAVA show the duplicate certain values in a text file

问题描述

[2014-08-19 00：01：43,453] REC | SRC：923119511824 | DST：9900 | CNT：1 | OPR：zong | ADD RIDAsMs

[2014-08-19 00 ：01：32,894] REC | SRC：923142676343 | DST：9900 | CNT：1 | OPR：zong | ADD BBCMEDIA \ n \\ nn

[2014-08-19 00：02：42,754 ] REC | SRC：923119511824 | DST：9900 | CNT：1 | OPR：zong | ADD sMs



这里是文本文件中的文字，我想显示SRC：之后的重复联系号码与java中ADD之后显示的联系号码。任何人都可以帮忙吗???我已经阅读了文件并将其存储到arraylist中，我是java的初学者。

[2014-08-19 00:01:43,753] REC|SRC:923119511824|DST:9900|CNT:1|OPR:zong|ADD RIDAsMs
[2014-08-19 00:01:32,894] REC|SRC:923142676343|DST:9900|CNT:1|OPR:zong|ADD BBCMEDIA\n\n
[2014-08-19 00:02:42,754] REC|SRC:923119511824|DST:9900|CNT:1|OPR:zong|ADD sMs

here is the text in text file, i want to show the duplicate contact numbers which are after "SRC:" with the contant that is shown after the "ADD" in java. Can any one help please??? i have read the file and stored it into an arraylist, i am beginner to java.

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

public class pring
{
    private static ArrayList<string> data = new ArrayList<string>();
    public static void main(String[] args) throws IOException
    {
        arrayListConstructor("C:/Users/DfroJaCk DB/Desktop/zongrecv.txt");
        System.out.println(data);
    }
    public static void arrayListConstructor(String filename) throws IOException
    {
        BufferedReader br = null;
        br = new BufferedReader(new FileReader(filename));
        String line = br.readLine();
        while (line != null)
        {
            data.add(line);
            line = br.readLine();
        }
        br.close();
    }
}

推荐答案

使用 String.split（）方法，如文档中所述 [ ^ ]。然后，您可以比较记录的特定字段。

Use on of the String.split() methods, as described in the documentation[^]. You can then compare specific fields of the records.

使用HashMap：

Use HashMap:

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;

public class pring
{
    private static ArrayList<String> data = new ArrayList<String>();
    public static void main(String[] args) throws IOException
    {
        arrayListConstructor("C:/Users/DfroJaCk DB/Desktop/zongrecv.txt");
        System.out.println(data);
    }
    public static void arrayListConstructor(String filename) throws IOException
    {
        HashMap<String, String> map = new HashMap<String, String>();

        BufferedReader br = null;
        br = new BufferedReader(new FileReader(filename));
        String line = br.readLine();
        while (line != null)
        {
            /* if line is new key, return null,
             * if line is duplicate key, return value
             */
            if (map.get(line) == null) {
                System.out.println("new: " + line);
                data.add(line);
                map.put(line, line);
            }
            else
                System.out.println("duplicate: " + line);

            line = br.readLine();
        }
        br.close();
    }
}

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