java 读取系统Properties

Posted 2020-12-01

java读取系统Properties 属性，针对配置较多的属性值，单独打印，实现代码如下：

 

import java.util.*;

public class PropertiesTest {

    public static void main(String[] args) {

        Properties properties = System.getProperties();
        PropertiesTest pt = new PropertiesTest();
        Map<String,String> map = pt.getSpecialMap(properties);
        //便于方便读取，配置较多的属性打印出来
        pt.showMap(map);
    }


    Map<String,String> getSpecialMap(Properties properties){

        Set<Map.Entry<Object,Object>> props  = properties.entrySet();
        Map<String,String> map = new HashMap<String, String>();
        Iterator<Map.Entry<Object, Object>> it = props.iterator();
        while (it.hasNext()) {
            Map.Entry<Object,Object> entry = it.next();
            System.out.println("key= " + entry.getKey() );
            System.out.println("value= " + entry.getValue());
            if("java.library.path".equalsIgnoreCase("" + entry.getKey())) {
                map.put(entry.getKey()+"",entry.getValue()+"");
            }
            if("java.class.path".equalsIgnoreCase("" + entry.getKey())) {
                map.put(entry.getKey()+"",entry.getValue()+"");
            }
            if ("sun.boot.class.path".equalsIgnoreCase("" + entry.getKey())) {
                map.put(entry.getKey()+"",entry.getValue()+"");
            }
            if("java.ext.dirs".equalsIgnoreCase("" + entry.getKey())) {
                map.put(entry.getKey()+"",entry.getValue()+"");
            }
        }
        return map;
    }


    void showMap(Map<String,String> map) {
        for (Map.Entry<String, String> entry : map.entrySet()) {
            System.out.println("----------------------------------------------------");
            System.out.println(entry.getKey() +":");
            splitStr(entry.getValue());
            System.out.println("----------------------------------------------------");
        }
    }

    void splitStr(String string) {
        String[] str = string.split(";");
        for (int i = 0; i < str.length; i++) {
            System.out.println(str[i]);
        }
    }

}