Read .properties file

最新推荐文章于 2023-03-15 19:38:42 发布

原创最新推荐文章于 2023-03-15 19:38:42 发布 · 717 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#string #import #properties #file #class #null

Study - Java 专栏收录该内容

2 篇文章

订阅专栏

本文介绍了一个简单的Java程序，用于从.properties文件中读取配置信息，并使用Hashtable存储键值对。程序首先加载指定的文件，然后遍历所有条目并将其存储在内存中以便后续检索。

package mytools.readfile;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Properties;

/**
* This class is used to read .properties file.
*
* @author WangJunyu
*/
public class ReadProperty {

    private String file = "";
    private Hashtable config = new Hashtable();

    public ReadProperty(String file) {

        this.file = file;
    }

    private void readConfig() {

        Properties prop = new Properties();
        String key = "";
        String value = "";

        try {

            prop.load(new FileInputStream(file));
        }
        catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        Enumeration emu = prop.keys();

        while (emu.hasMoreElements()) {

            key = (String) emu.nextElement();
            value = prop.getProperty(key);
            config.put(key, value);
        }
    }

    public String get(String key) {

        String value = (String) config.get(key);

        if (("".equals(value)) || (value == null)) {

            System.out.println("No config!");
        }

        return value;
    }

    public static void main(String[] args) {

        ReadProperty read = new ReadProperty("test.properties");
        read.readConfig();
        System.out.println(read.get("key1"));
    }
}