Question

我正在学习Java。我有一个示例日志文件，其中包含密钥对及其值。我想从某些行中找到一个密钥对及其价值。例如，如果行以“ x”开头，请读取该行并找到它。我能够获取密钥对及其在输出文件中的值，但无法获取行尾的json对象。目标是将文本文件作为输入，并查找句子是否以特定单词开头。如果是，请从该行中查找键对和值，并包含json对象（如果有）

任务：查找以“ [Student info]”开头的行，并解析学生ID，班级状态，输入（这是json对象）。有时输入也可能为空。

我已经在该平台上检查了其他问题，包括this，但并没有太大帮助。

**Input file.**

[King] 9 AM America -- kingNumber 1234567890 -- address: abc/cd/ef -- birthmonth: unknown Input={||Ouptut={}
[born time] 9 AM London -- kingNumber 1234567890 -- address: abc/cd/ef -- birthmonth: unknown Input={||Ouptut={}
[Student info] -- 12/08/2011 -- StudentId: 124421 -- Phonenumber: 4252076406 -- ClassStatus: Senior -- "Random String..." Input={ || Ouput={}
[born time] 9 AM London -- kingNumber 1234567890 -- address: abc/cd/ef -- birthmonth: unknown Input={||Ouptut={}
[Student info] -- 12/08/2011 -- StudentId: 1234567 -- Phonenumber: 4252076406 -- ClassStatus: Senior -- "Random String..." Input={
"kaju": [{
        "Sno": {
            "type": "literal",
            "value": "random"
        }
    }]
}

[Game] 9 AM London -- kingNumber 1234567890 -- address: abc/cd/ef -- birthmonth: unknown Input={
[Student info] -- 12/08/2011 -- StudentId: 1234567 -- Phonenumber: 4252076406 -- ClassStatus: Senior -- "Random String..." Input={ || Ouput={
"core": [{
    "id": {
        "datatype": "https://www.w3schools.com/",
        "type": "website",
        "value": "study"
    },
    "entity": {
        "type": "url",
        "value": "https://www.w3schools.com/"
    },
    "Sno": {
        "type": "literal",
        "value": "random"
    }
}]
}

**Expected Output File**

[Student info] -- 12/08/2011 -- StudentId: 124421 -- Phonenumber: 4252076406 -- ClassStatus: Senior -- "Random String..." Input={ || Ouput={}
[Student info] -- 12/08/2011 -- StudentId: 1234567 -- Phonenumber: 4252076406 -- ClassStatus: Senior -- "Random String..." Input={
"kaju": [{
        "Sno": {
            "type": "literal",
            "value": "random"
        }
    }]
}
[Student info] -- 12/08/2011 -- StudentId: 1234567 -- Phonenumber: 4252076406 -- ClassStatus: Senior -- "Random String..." Input={ || Ouput={
"core": [{
    "id": {
        "datatype": "https://www.w3schools.com/",
        "type": "website",
        "value": "study"
    },
    "entity": {
        "type": "url",
        "value": "https://www.w3schools.com/"
    },
    "Sno": {
        "type": "literal",
        "value": "random"
    }
}]
}

**Current Output File**

[Student info] -- 12/08/2011 -- StudentId: 124421 -- Phonenumber: 4252076406 -- ClassStatus: Senior -- "Random String..." Input={ || Ouput={}
[Student info] -- 12/08/2011 -- StudentId: 1234567 -- Phonenumber: 4252076406 -- ClassStatus: Senior -- "Random String..." Input={
[Student info] -- 12/08/2011 -- StudentId: 1234567 -- Phonenumber: 4252076406 -- ClassStatus: Senior -- "Random String..." Input={ || Ouput={

从上面的文本文件中您可以看到，我只能提取所需的行（学生信息），但无法获取附加的json对象。我也希望抽象json对象（如果有）。在这种情况下，新行始终以“ [”开头。

注意：

不能保证行[student info]出现在文件中的特定行或特定次数。
可以有n条其他行以及其他信息，但重要的是“学生信息”行及其json（如果有）。

下面是我的代码。

public class Kickstarter {

public static void main (String... args) {
    Scanner scan = new Scanner(Kickstarter.class.getResourceAsStream("sample.txt"));
    List<String> fileByLine = new ArrayList<>();
    List<StudentInfo> result = new ArrayList<>();

    while(scan.hasNextLine()) {
        fileByLine.add(scan.nextLine());
    }
    for (Iterator<String> iterator = fileByLine.iterator(); iterator.hasNext();) {
        String line = iterator.next();
        if (!line.startsWith("[Student info]")) {
            iterator.remove();
        }
    }

    for (int i = 0; i < fileByLine.size(); i++) {
        System.out.println(fileByLine.get(i));

    }
}
}

另一个文件

import com.google.gson.JsonObject;

public class StudentInfo {
   public String studentinfo;
   public boolean isBasic;
   public JsonObject json;
   public String jsonStringBuildUp;

   public StudentInfo (String studentinfo, boolean isBasic) {
       this.studentinfo = studentinfo;
       this.isBasic = isBasic;
       this.json = null;
       this.jsonStringBuildUp = "";
   }

}

Answer 1

loadData

您需要创建如下的POJO类。

StudentInfo.java

<?php

$url = 'https://query1.finance.yahoo.com/v1/finance/screener?lang=en-US&region=US&formatted=true&corsDomain=finance.yahoo.com';
// $url = 'https://finance.yahoo.com/screener/unsaved/f0171a68-053e-42f2-a941-d6ecdf2ba6d1';



 $parameters =
  [
   'size' => 25,
   'offset' => 50,
   'sortField' => 'intradaymarketcap',
   'sortType' => 'DESC',
   'quoteType' => 'EQUITY',
   'topOperator' => 'AND',
   'query' => array(
        'operator' => 'AND',
        'operands'=> array(
            'operator' => 'or',
            'operands' => array(
                'operator' => 'EQ',
                'operands' =>  array("region","jp")  
            )
        )
    ),
   'userId' => 'HFEELK3VBE3KPE4MGEA6PZTXXL',
   'userIdType' => 'guid'
  ];
  $parameters = json_encode($parameters);

  $headers =
  [
   'Accept: application/json, text/javascript, */*; q=0.01',
   'Accept-Language: en-US,en;q=0.5',
   'X-Requested-With: XMLHttpRequest',
   'Connection: keep-alive',
   'Pragma: no-cache',
   'Cache-Control: no-cache',
  ];
  $cookie = tmpfile();
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_HEADER, false);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
  curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.31');
  curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie);
  curl_setopt($ch, CURLOPT_COOKIEJAR, $cookie);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
  curl_setopt($ch, CURLOPT_POST, true);
  curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($parameters));
  // curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
  curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);

  $response = curl_exec($ch);
  curl_close($ch);

  var_dump($response);

?>

Core.java

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;
import java.util.Set;

import com.google.gson.Gson;

public class KickStarter {

    private static final String STUDENT_INFO = "[Student info]";
    private Map<String, StudentInfo> lineJsonMap;
    private String key;
    private StringBuilder jsonBuilder;

    public static void main(String... args) {
        new KickStarter().scan();
    }

    private void scan() {

        Scanner scan = new Scanner(KickStarter.class.getClassLoader().getResourceAsStream("sample.txt"));
        lineJsonMap = new HashMap<String, StudentInfo>();
        jsonBuilder = null;
        key = null;

        while (scan.hasNextLine()) {

            String line = scan.nextLine();
            if (!line.startsWith("[")) {
                if (jsonBuilder == null) {
                    jsonBuilder = new StringBuilder();
                    jsonBuilder.append("{");
                }
                jsonBuilder.append(line.trim());
            } else if (line.startsWith(STUDENT_INFO)) {
                extractJSON();
                lineJsonMap.put(line, null);
                key = line;
            } else if (line.startsWith("[")) {
                extractJSON();
            }
        }
        extractJSON();
        scan.close();

        // Finally Print values

        Set<Entry<String, StudentInfo>> entrySet = lineJsonMap.entrySet();
        for (Entry<String, StudentInfo> entry : entrySet) {
            System.out.println(entry.getKey());
            StudentInfo value = entry.getValue();
            if (value != null) {
                Gson gson = new Gson();
                System.out.println(gson.toJson(value));
            }
        }
    }

    private void extractJSON() {

        if (key != null) {
            StudentInfo fromJson = null;
            if (jsonBuilder != null) {
                Gson gson = new Gson();
                fromJson = gson.fromJson(jsonBuilder.toString(), StudentInfo.class);
            }
            lineJsonMap.put(key, fromJson);
            key = null;
            jsonBuilder = null;
        }
    }
}

Id.java

public class StudentInfo {
    private Core[] core;
    private Kaju[] kaju;

    public Core[] getCore() {
        return core;
    }

    public void setCore(Core[] core) {
        this.core = core;
    }

    @Override
    public String toString() {
        return "ClassPojo [core = " + core + "][kaju = " + kaju + "]";
    }

    public Kaju[] getKaju() {
        return kaju;
    }

    public void setKaju(Kaju[] kaju) {
        this.kaju = kaju;
    }
}

Kaju.java

public class Core {

    private Id id;
    private Entity entity;
    private Sno Sno;

    public Id getId() {
        return id;
    }

    public void setId(Id id) {
        this.id = id;
    }

    public Entity getEntity() {
        return entity;
    }

    public void setEntity(Entity entity) {
        this.entity = entity;
    }

    public Sno getSno() {
        return Sno;
    }

    public void setSno(Sno Sno) {
        this.Sno = Sno;
    }

    @Override
    public String toString() {
        return "ClassPojo [id = " + id.toString() + ", entity = " + entity.toString() + ", Sno = " + Sno.toString() + "]";
    }
}

Entity.java

public class Id {

    private String value;
    private String datatype;
    private String type;

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }

    public String getDatatype() {
        return datatype;
    }

    public void setDatatype(String datatype) {
        this.datatype = datatype;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    @Override
    public String toString() {
        return "ClassPojo [value = " + value + ", datatype = " + datatype + ", type = " + type + "]";
    }
}

Sno.java

public class Kaju {

    private Sno Sno;

    public Sno getSno() {
        return Sno;
    }

    public void setSno(Sno Sno) {
        this.Sno = Sno;
    }

    @Override
    public String toString() {
        return "ClassPojo [Sno = " + Sno + "]";
    }
}

无法从Java中的日志文件解析json对象

1 个答案: