Java 读取文本文件并将键值对存储在不同的映射中
这是文本文件:Java 读取文本文件并将键值对存储在不同的映射中,java,dictionary,java.util.scanner,text-parsing,Java,Dictionary,Java.util.scanner,Text Parsing,这是文本文件: #Person PRIM_KEY=personId SEX=gender YEARS=age NAME=fullName #Automobil PRIM_KEY=registrationNumber MAKE=manufacturer TYPE=model 读取文件: Scanner scanner = new Scanner(new FileReader("C:/workspace/column-mapping.txt")); 当我遇到人时,在下面定义的地图中: Map&l
#Person
PRIM_KEY=personId
SEX=gender
YEARS=age
NAME=fullName
#Automobil
PRIM_KEY=registrationNumber
MAKE=manufacturer
TYPE=model
读取文件:
Scanner scanner = new Scanner(new FileReader("C:/workspace/column-mapping.txt"));
当我遇到人时,在下面定义的地图中:
Map<String, String> personMap = new LinkedHashMap<String, String>();
同样,当我遇到汽车时,在下面的地图中
Map<String, String> automobilMap = new LinkedHashMap<String, String>();
当我阅读该文件时,如何根据Person和Automobil将这些键值对存储在两个不同的映射中
编辑示例代码:
Scanner scanner = new Scanner(new FileReader("C:/workspace/column-mapping.txt"));
Map<String, String> personMap = new LinkedHashMap<String, String>();
Map<String, String> automobilMap = new LinkedHashMap<String, String>();
String line;
while (scanner.hasNext()) {
line = scanner.next();
if (!line.startsWith("#") && !line.isEmpty()) {
String[] columns = line.split("=");
personMap.put(columns[0], columns[1]);
}
}
System.out.println(personMap);
这样,我可以将所有键值对放在一个MapPersonMap中。但是,根据不同的部分,我希望能够将它放在不同的地图中。这不是最优雅的解决方案,但它可以工作
Scanner scanner = new Scanner(new FileReader("C:/workspace/column-mapping.txt"));
Map<String, String> personMap = new LinkedHashMap<String, String>();
Map<String, String> automobilMap = new LinkedHashMap<String, String>();
String line;
boolean person = false;
boolean automobil= false;
while (scanner.hasNext()) {
line = scanner.next();
if(line.startsWith("#Person") && !line.isEmpty()){
line = scanner.next();
person = true;
automobil = false;
}
if(line.startsWith("#Automobil") && !line.isEmpty()){
line = scanner.next();
automobil = true;
person = false;
}
if(person){
if (!line.startsWith("#") && !line.isEmpty()) {
String[] columns = line.split("=");
for(String str:columns){
System.out.println(str);
}
personMap.put(columns[0], columns[1]);
}
}
if(automobil){
if (!line.startsWith("#") && !line.isEmpty()) {
String[] columns = line.split("=");
for(String str:columns){
System.out.println(str);
}
automobilMap.put(columns[0], columns[1]);
}
}
}
System.out.println("personMap"+personMap);
System.out.println("automobilMap"+automobilMap);
我想向你们提出两种不同的方法。 第一种方法是简单地用一个if来解决你的问题,第二种方法我假设你想存储多个Automobil和多个Person,所以我创建了两个类来解决这个问题 我希望这可以是有用的,这是有趣的,使这段代码 第一种方法
}您的问题是?可能是重复的井。。。我建议您编写一些满足您发布的要求的代码。或你会付给为你写代码的人一些钱。我会这样做…你已经有了90%的所需代码-你只需要记住你当前添加到的地图,并根据字符后面的文本切换地图引用。
Scanner scanner = new Scanner(new FileReader("C:/workspace/column-mapping.txt"));
Map<String, String> personMap = new LinkedHashMap<String, String>();
Map<String, String> automobilMap = new LinkedHashMap<String, String>();
String line;
while (scanner.hasNext()) {
line = scanner.next();
if (!line.startsWith("#") && !line.isEmpty()) {
String[] columns = line.split("=");
personMap.put(columns[0], columns[1]);
}
}
System.out.println(personMap);
Scanner scanner = new Scanner(new FileReader("C:/workspace/column-mapping.txt"));
Map<String, String> personMap = new LinkedHashMap<String, String>();
Map<String, String> automobilMap = new LinkedHashMap<String, String>();
String line;
boolean person = false;
boolean automobil= false;
while (scanner.hasNext()) {
line = scanner.next();
if(line.startsWith("#Person") && !line.isEmpty()){
line = scanner.next();
person = true;
automobil = false;
}
if(line.startsWith("#Automobil") && !line.isEmpty()){
line = scanner.next();
automobil = true;
person = false;
}
if(person){
if (!line.startsWith("#") && !line.isEmpty()) {
String[] columns = line.split("=");
for(String str:columns){
System.out.println(str);
}
personMap.put(columns[0], columns[1]);
}
}
if(automobil){
if (!line.startsWith("#") && !line.isEmpty()) {
String[] columns = line.split("=");
for(String str:columns){
System.out.println(str);
}
automobilMap.put(columns[0], columns[1]);
}
}
}
System.out.println("personMap"+personMap);
System.out.println("automobilMap"+automobilMap);
public static void main(String args[]) throws FileNotFoundException{
Scanner scanner = new Scanner(new FileReader("C:/workspace/column-mapping.txt"));
Map<String, String> personMap = new LinkedHashMap<String, String>();
Map<String, String> automobilMap = new LinkedHashMap<String, String>();
String line= scanner.nextLine();
while(scanner.hasNext()){
Map<String, String> currentMap = null;
if(line.equals("#Person")){
currentMap=personMap;
}
if(line.equals("#Automobil")){
currentMap=automobilMap;
}
while(scanner.hasNext()){
line=scanner.nextLine();
if(line.startsWith("#"))
break; //restart the loop
String splitted[] = line.split("=");
currentMap.put(splitted[0], splitted[1]);
}
}
}
public static void main(String[] args) throws FileNotFoundException {
Scanner scanner = new Scanner(new FileReader("C:/workspace/column-mapping.txt"));
Map<String, Person> personMap = new LinkedHashMap<String, Person>();
Map<String, Car> automobilMap = new LinkedHashMap<String, Car>();
String line;
while (scanner.hasNextLine()) {
line = scanner.nextLine();
if(line.equals("#Person")){
String primaryKey = scanner.nextLine().split("=")[1];
String sex = scanner.nextLine().split("=")[1];
String years = scanner.nextLine().split("=")[1];
String name = scanner.nextLine().split("=")[1];
personMap.put(primaryKey, new Person(sex,years,name));
}
if(line.equals("#Automobil")){
String primaryKey = scanner.nextLine().split("=")[1];
String make = scanner.nextLine().split("=")[1];
String type = scanner.nextLine().split("=")[1];
automobilMap.put(primaryKey, new Car(make,type));
}
}
Set<String> personKeys = personMap.keySet();
Set<String> automobilKeys = automobilMap.keySet();
for(String k : personKeys){
System.out.println("Person: "+k);
System.out.println(personMap.get(k));
}
for(String k : automobilKeys){
System.out.println("Car: "+k);
System.out.println(automobilMap.get(k));
}
}
public class Person {
boolean male; //true for male, false for female
int years;
String name;
String surname;
public Person(String gender, String age, String fullName){
if(gender.equals("male"))
male = true;
else
male = false;
years=Integer.parseInt(age);
String splitted[] = fullName.split(" ");
name = splitted[0];
surname = splitted[1];
}
@Override
public String toString(){
String gender = "male";
if(!male)
gender = "female";
return "SEX = "+gender+"\nYEARS = "+years+"\nNAME = "+name+" "+surname;
}
}
public class Car {
String make;
String type;
public Car(String manufacturer,String model){
make=manufacturer;
type=model;
}
@Override
public String toString(){
return "MAKE = "+make+"\nTYPE = "+type;
}