Question

我有如下配置文件“ Replace_IP_List.cfg”

10.19.120.39=[fec0:1111:2222:3333:4444]
[fec0:2222:2222:3333:4444] = 10.18.215.151

我正在读取cfg文件以获取键和值，因为键具有'：'，所以我无法获取完整的字符串，

Properties prop = new Properties();
    InputStream is = new FileInputStream("Replace_IP_List.cfg");

    prop.load(is);
    Enumeration<?> e = prop.propertyNames();
    while (e.hasMoreElements())
    {
        String key = (String) e.nextElement();
        String value = prop.getProperty(key);
        System.out.println("Key : " + key + ", Value : " + value);
        str=str.replace(key, value);

输出：

Key : 10.19.120.39, Value : [fec0:1111:2222:3333:4444]
Key : [fec0, Value : 2222:2222:3333:4444] = 10.18.215.151

cfg文件是在运行时生成的（或由其他人提供），我不需要编辑cfg文件或转义为：

任何人都可以建议我在程序内部如何逃脱：在读取文件时仅考虑=。预期输出如下，

Key : 10.19.120.39, Value : [fec0:1111:2222:3333:4444]
Key : [fec0:2222:2222:3333:4444], Value : 10.18.215.151

Answer 1

一种方法可能是克隆您的属性文件，同时在等号之前转义冒号并在如下的帮助器类中读取该属性文件：

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.util.Enumeration;
import java.util.Properties;

public class PropertyFileHelper {

    class FakeReader extends Reader {

        private Reader in;
        private File file;

        public FakeReader(Reader in) throws IOException {

            file = File.createTempFile("dummy", "dummuy");

            try(
                    BufferedReader r = new BufferedReader(in);
                    BufferedWriter w = new BufferedWriter(new FileWriter(file));
                    ){

                String line;
                while((line = r.readLine()) != null) {
                    if(line.contains(":") && line.contains("=") && line.indexOf(':') < line.indexOf('=')){
                        String modifiedLine = "";
                        boolean equalFetched = false;
                        for(char c : line.toCharArray()) {
                            modifiedLine = modifiedLine.concat(equalFetched ? "" : ( c == ':' ? "\\" : "") + c) ;
                            equalFetched = c == '=';
                        }
                        line = modifiedLine;
                    }
                    w.write(line);
                    w.newLine();
                }
            }
            this.in = new FileReader(file);
        }

        @Override
        public int read(char[] cbuf, int off, int len) throws IOException {
            return in.read(cbuf, off, len);
        }

        @Override
        public void close() throws IOException {
            this.in.close();
        }

    }

    private void test() throws IOException {

        Properties prop = new Properties();

        prop.load(new FakeReader(new FileReader("/home/guest/Desktop/p.properties")));

        Enumeration<?> e = prop.propertyNames();
        while (e.hasMoreElements())
        {
            String key = (String) e.nextElement();
            String value = prop.getProperty(key);
            System.out.println("Key : " + key + " Value : " + value);
        }

    }

    public static void main(String[] args) throws IOException {
        new PropertyFileHelper().test();
    }

}

Java-如何在不转义内部文件的情况下从属性文件读取冒号？

1 个答案: