[英]Populating a HashMap with entries from a properties file
I want to populate a HashMap
using the Properties
class.我想使用
Properties
类填充HashMap
。
I want to load the entries in the .propeties
file and then copy it into the HashMap
.我想加载
.propeties
文件中的条目,然后将其复制到HashMap
。
Earlier, I used to just initialize the HashMap
with the properties file, but now I have already defined the HashMap
and want to initialize it in the constructor only.之前我只是用属性文件来初始化
HashMap
,但是现在我已经定义了HashMap
,只想在构造函数中初始化它。
Earlier approach:较早的做法:
Properties properties = new Properties();
try {
properties.load(ClassName.class.getResourceAsStream("resume.properties"));
} catch (Exception e) {
}
HashMap<String, String> mymap= new HashMap<String, String>((Map) properties);
But now, I have this但是现在,我有了这个
public class ClassName {
HashMap<String,Integer> mymap = new HashMap<String, Integer>();
public ClassName(){
Properties properties = new Properties();
try {
properties.load(ClassName.class.getResourceAsStream("resume.properties"));
} catch (Exception e) {
}
mymap = properties;
//The above line gives error
}
}
How do I assign the properties object to a HashMap
here?如何在此处将属性对象分配给
HashMap
?
If I understand correctly, each value in the properties is a String which represents an Integer.如果我理解正确,属性中的每个值都是一个代表整数的字符串。 So the code would look like this:
所以代码看起来像这样:
for (String key : properties.stringPropertyNames()) {
String value = properties.getProperty(key);
mymap.put(key, Integer.valueOf(value));
}
Use .entrySet()
使用
.entrySet()
for (Entry<Object, Object> entry : properties.entrySet()) {
map.put((String) entry.getKey(), (String) entry.getValue());
}
Java 8 Style: Java 8 风格:
Properties properties = new Properties();
// add some properties here
Map<String, String> map = new HashMap();
map.putAll(properties.entrySet()
.stream()
.collect(Collectors.toMap(e -> e.getKey().toString(),
e -> e.getValue().toString())));
public static Map<String,String> getProperty()
{
Properties prop = new Properties();
Map<String,String>map = new HashMap<String,String>();
try
{
FileInputStream inputStream = new FileInputStream(Constants.PROPERTIESPATH);
prop.load(inputStream);
}
catch (Exception e) {
e.printStackTrace();
System.out.println("Some issue finding or loading file....!!! " + e.getMessage());
}
for (final Entry<Object, Object> entry : prop.entrySet()) {
map.put((String) entry.getKey(), (String) entry.getValue());
}
return map;
}
you can use the below Method to load the property file in a map您可以使用以下方法在地图中加载属性文件
public static Map<String, String> getProperties(String filePropertyFile){
Properties getProperties = new Properties();
FileInputStream inputStream = null;
HashMap<String, String> propertyMap = new HashMap<String, String>();
try {
inputStream = new FileInputStream(filePropertyFile);
getProperties.load(inputStream);
propertyMap.putAll((Map) getProperties);
} catch (Exception e) {
e.printStackTrace();
}
return propertyMap;
}
Unit Test:单元测试:
@Test
public void getPropertiesTest()
String outputOmJarArrayAttributesPath = System.getProperty("user.dir") + "/src/main/resources/OutputOmJarArrayAttributes.properties";
System.out.println(PropertyFileUtils.getProperties(outputOmJarArrayAttributesPath));;
}
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