Searching txt in a file using java

Question

This is my txt file

"hhhead":"Melvin","respondent":"Edlen"

I Want to search hhhead and program will return Melvin

how can I do that?

You could easily use `String.split(",")` and a `Map` for the data. What have you tried so far, code wise? — vikingsteve, Jun 15 '17 at 11:39
"hhhead":"Melvin","respondent":"Edlen","int_date":"2017-06-15","start_time":"09:46","interviewer":"Kit","house_type":"1","nbr":2,"nstorey":1,"roof":"1","wall":"2","floor":"7","nnucfam":1,"phsize":5,"hpq_mem":[{"memno":"1","msname":"Malabarbas","mfname":"Melvin","mmname":"Pirneto","reln":"1","reln_o":"","nucfam":"1","sex":"1","birth_date":"1969-12-18" — Shaine, Jun 15 '17 at 11:41
heres more. all i want is that if i search hhhead it will return Melvin and if i search respondent it will return Edlen. — Shaine, Jun 15 '17 at 11:42
@Shaine Have a look at [this](https://stackoverflow.com/a/5600442/599528) and [this](https://stackoverflow.com/a/15577756/599528) — Jacob, Jun 15 '17 at 11:57
thanks.. i know how to search hhhead but dont know how to return melvin. — Shaine, Jun 15 '17 at 12:00
@Shaine Whatever code you have written, copy and paste here by editing your question and then ask where exactly you are stuck rather than asking solution. — Jacob, Jun 15 '17 at 12:06
`public static void main(String[] args) { try (BufferedReader br = new BufferedReader(new FileReader(FILENAME))) { String sCurrentLine; String Seach="hhhead"; while ((sCurrentLine = br.readLine()) != null) { if(sCurrentLine.contains(Seach)){ System.out.println("hhhead FOUND!!"); } } } catch (IOException e) { e.printStackTrace(); } }` — Shaine, Jun 15 '17 at 12:13

score 2 · Accepted Answer · answered Jun 15 '17 at 12:22

I assume you have the code ready to read the .txt file and write into a string.

In the below code, str is the string having text file content.

String str = "\"hhhead\":\"Melvin\",\"respondent\":\"Edlen\",\"int_date\":\"2017-06-1\u200C\u200B5\",\"start_time\":\"09:\u200C\u200B46\",\"interviewer\":\"K\u200C\u200Bit\",\"house_type\":\"1\"\u200C\u200B,\"nbr\":2,\"nstorey\":1\u200C\u200B,\"roof\":\"1\",\"wall\":\"\u200C\u200B2\",\"floor\":\"7\",\"nnuc\u200C\u200Bfam\":1,\"phsize\":5,\"h\u200C\u200Bpq_mem\":[{\"memno\":\"1\u200C\u200B\",\"msname\":\"Malabarb\u200C\u200Bas\",\"mfname\":\"Melvin\u200C\u200B\",\"mmname\":\"Pirneto\"\u200C\u200B,\"reln\":\"1\",\"reln_o\"\u200C\u200B:\"\",\"nucfam\":\"1\",\"se\u200C\u200Bx\":\"1\",\"birth_date\":\u200C\u200B\"1969-12-18\"";
        Map<String,String> map = new HashMap<String,String>();
        String[] split = str.split(",");
        for(String s: split){
            String[] split2 = s.split(":");
            map.put(split2[0], split2[1]);
        }

        System.out.println(map.get("\"hhhead\""));

I copied the data from your comments and had to use backslash("\") to escape string, used split method having "," as an argument and stored in to a key-value map. If you search with the key, "\"hhhead\"" you get "Melvin".

Hope this helps!

Glad to see it helped you! Feel free to mark as an answer if it worked for you. — harshavmb, Jun 15 '17 at 12:26
yes very helpfull nothing i can say. all i want is all here in ur code. thank u very much. — Shaine, Jun 15 '17 at 12:29

score 0 · Answer 2 · answered Jun 15 '17 at 11:40

0

You can read the file and parse the data.

Then you can store the data in key-value pairs like a Map then you can easily get it.

answered Jun 15 '17 at 11:40

gprathour

14,813
5
66
90

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@Shaine We are not here to write code for you. If you face any problem then people might try to help you. Don't ask for code without putting your own efforts. – gprathour Jun 15 '17 at 11:45

score 0 · Answer 3 · answered Jun 15 '17 at 12:13

0

public static void main(String[] args) {

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

        String sCurrentLine;
                    String Seach="hhhead";
        while ((sCurrentLine = br.readLine()) != null) {
                        if(sCurrentLine.contains(Seach)){
            System.out.println("hhhead FOUND!!");
                        }
        }

    } catch (IOException e) {
        e.printStackTrace();
    }

}

answered Jun 15 '17 at 12:13

Shaine

80
1
10

in System.out.println("hhhead FOUND!!"); – Shaine Jun 15 '17 at 12:15
With all due respect, answers are for solutions to your question. So what you should do is copy and paste your code by editing the question and should delete this answer. – Jacob Jun 15 '17 at 12:18

Searching txt in a file using java

3 Answers3