propert文件增删改查

╰+攻爆jí腚メ 2022-08-07 14:50 210阅读 0赞

============= 增删改查 祝你好运 ===========================  
  
  
 public static void main(String args\[\]) throws IOException \{  
  Properties prop = new Properties();  
  OutputStream out = new FileOutputStream("D:\\\\workspace\\\\JavaStudy\\\\src\\\\test\\\\test.properties");  
    
  /\*\*  
   \* 新增逻辑：  
   \* 1.必须先读取文件原有内容  
   \* 2.增加新的记录以后，再一起保存  
   \*/  
  //1.先读取文件原有内容  
  Map toSaveMap = new HashMap();  
  Set keys = prop.keySet();  
  for(Iterator itr = keys.iterator(); itr.hasNext();)\{  
   String key = (String) itr.next();  
   Object value = prop.get(key);  
   toSaveMap.put(key, value);  
  \}  
  //2.增加你需要增加的属性内容  
  toSaveMap.put("name", "zhang san");  
  toSaveMap.put("age", "25");  
  prop.putAll(toSaveMap);  
  prop.store(out, "==== after add ====");  
    
  /\*\*  
   \* 修改逻辑：重新设置对应Key的值即可，非常简单  
   \*/  
  prop.clear();  
  toSaveMap.put("name", "li si");  
  toSaveMap.put("age", "26");  
  prop.putAll(toSaveMap);  
  prop.store(out, "==== after modify ====");  
    
  /\*\*  
   \* 删除逻辑：找到对应的key，删除即可  
   \*/    
  prop.clear();  
  toSaveMap.remove("name");  
  prop.putAll(toSaveMap);  
  prop.store(out, "==== after remove ===="));  
    
  /\*\*  
   \* 查询逻辑：你是知道滴  
   \*/  
  InputStream in = new FileInputStream("D:\\\\workspace\\\\JavaStudy\\\\src\\\\test\\\\test.properties");  
  prop.load(in);  
  System.out.println("name: " + prop.get("name"));  
  System.out.println("age: " + prop.get("age"));  
    
 \}  
  
  
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