import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Set;

public class ProTest {
    public static void main(String[] args) throws FileNotFoundException, IOException {
        Properties pro = new Properties();
        InputStream is = new FileInputStream("f:/temp/test.ini");
        pro.load(is);
        showPro(pro);
        pro.setProperty("BBB", "264");
        OutputStream os = new FileOutputStream("f:/temp/test.ini");
        pro.store(os,null);
        pro.clear();
        is.close();
        is =  new FileInputStream("f:/temp/test.ini");
        pro.load(is);
        showPro(pro);
       
        os.close();
    }
    
    public static void showPro(Properties pro)
    {
        Set<Entry<Object, Object>> entrys = pro.entrySet();
        for (Entry<Object, Object> entry : entrys) {
            System.out.println(entry.getKey()+"="+entry.getValue());
        }
    }
}

------解决方案--------------------
Java code

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Set;

public class ProTest {
    public static void main(String[] args) throws FileNotFoundException, IOException {
        Properties pro = new Properties();
        InputStream is = new FileInputStream("f:/temp/test.ini");
        pro.load(is);
        showPro(pro);
        pro.setProperty("BBB", "264");
        OutputStream os = new FileOutputStream("f:/temp/test.ini");
        pro.store(os,null);
        pro.clear();
        is.close();
        is =  new FileInputStream("f:/temp/test.ini");
        pro.load(is);
        showPro(pro);
        is.close();
        os.close();
    }
    
    public static void showPro(Properties pro)
    {
        Set<Entry<Object, Object>> entrys = pro.entrySet();
        for (Entry<Object, Object> entry : entrys) {
            System.out.println(entry.getKey()+"="+entry.getValue());
        }
    }
}

------解决方案--------------------
它认第一个=号，COM2为key，WSDDR=//10.121.4.2:10000为value，没什么问题


------解决方案--------------------

1.import java.io.BufferedWriter; 
2.import java.io.File; 
3.import java.io.FileInputStream; 
4.import java.io.FileWriter; 
5.import java.util.Properties; 
6. 
7.public class IniRead { 
8.private static Properties ini = null; 
9.    //设置INI文件 
10.    static File file=new File("src/Config.ini"); 
11.    static { 
12.        try { 
13.            ini = new Properties (); 
14.            //加载文件 
15.            ini.load (new FileInputStream (file)); 
16.        }catch (Exception ex) { 
17.            ex.printStackTrace(); 
18.        } 
19.    } 
20.    private IniRead() { 
21.    } 
22.    /**  
23.     * 读取INI信息  
24.     * */ 
25.    public static String getIniKey (String key) { 
26.        if(!ini.containsKey (key)) { 
27.            return ""; 
28.        } 
29.        return ini.get(key).toString ();