java 顺序 读写 Properties 配置文件

Posted 2020-08-19 吃饭了吗

java 顺序 读写 Properties 配置文件 支持中文 不乱码

java 顺序 读写 Properties 配置文件 ，java默认提供的Properties API 继承hashmap ，不是顺序读写的。

特从网上查资料，顺序读写的代码，如下，

import java.util.Collections;
import java.util.Enumeration;
import java.util.LinkedHashSet;
import java.util.Properties;
import java.util.Set;

public class OrderedProperties extends Properties {
    private static final long serialVersionUID = -4627607243846121965L;
    private final LinkedHashSet<Object> keys = new LinkedHashSet<Object>();

    public Enumeration<Object> keys() {
        return Collections.<Object> enumeration(keys);
    }

    public Object put(Object key, Object value) {
        keys.add(key);
        return super.put(key, value);
    }
    
    public synchronized Object remove(Object key) {
        keys.remove(key);
        return super.remove(key);
    }

    public Set<Object> keySet() {
        return keys;
    }

    public Set<String> stringPropertyNames() {
        Set<String> set = new LinkedHashSet<String>();
        for (Object key : this.keys) {
            set.add((String) key);
        }
        return set;

    }
}

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.Properties;

public class PropertiesTest {

    public static void main(String[] args) {
        String readfile = "D:/eclipseworkspace/test/src/test.txt";
        Properties pro = readPropertiesFileObj(readfile); // 读取properties文件
        System.out.println(pro.getProperty("password0.9271224287974811"));
        pro.remove("password0.008229652622303574");
        writePropertiesFileObj(readfile, pro); // 写properties文件
    }

    // 读取资源文件,并处理中文乱码
    public static Properties readPropertiesFileObj(String filename) {
        Properties properties = new OrderedProperties();
        try {
            InputStream inputStream = new FileInputStream(filename);
            BufferedReader bf = new BufferedReader(new InputStreamReader(inputStream, "utf-8"));
            properties.load(bf);
            inputStream.close(); // 关闭流
        } catch (IOException e) {
            e.printStackTrace();
        }
        return properties;
    }

    // 写资源文件，含中文
    public static void writePropertiesFileObj(String filename, Properties properties) {
        if (properties == null) {
            properties = new OrderedProperties();
        }
        try {
            OutputStream outputStream = new FileOutputStream(filename);
            BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(outputStream, "utf-8"));
            properties.setProperty("username" + Math.random(), "myname");
            properties.setProperty("password" + Math.random(), "mypassword");
            properties.setProperty("chinese" + Math.random(), "中文");
            properties.store(bw, null);
            outputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}