java读取配置文件信息

1、先引包

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.Iterator;
import java.util.Properties;

2、根据key取值

public static void main(String[] args) {
        String str = getValues("f:/file.properties","filePath1");
        System.out.println(str);
    }

    public static String getValues(String fileName , String key){
        String values = "";
        try{
            if(null != fileName && !fileName.trim().equals("")){
                Properties prop = new Properties();
                InputStream in = new BufferedInputStream (new FileInputStream(fileName));
                prop.load(in);     ///加载属性列表
                values = prop.getProperty(key);
            }
        }catch(Exception e){
            e.printStackTrace();
        }
        return values;
    }

3、扫描配置文件中所有信息

public static void main(String[] args) {
        Properties prop = new Properties();
        try{
            //读取属性文件
            InputStream in = new BufferedInputStream (new FileInputStream("f:/file.properties"));
            prop.load(in);     ///加载属性列表
            prop.getProperty()
            Iterator<String> it=prop.stringPropertyNames().iterator();
            while(it.hasNext()){
                String key=it.next();
                System.out.println(key);//打印key
                System.out.println(prop.getProperty(key));//打印值
            }
            in.close();

            ///保存属性到b.properties文件
            FileOutputStream oFile = new FileOutputStream("b.properties", true);//true表示追加打开
            prop.setProperty("phone", "10086");
            prop.store(oFile, "The New properties file");
            oFile.close();
        }
        catch(Exception e){
            System.out.println(e);
        }
    }