java properties增刪改查

java properties增刪改查

public static void main(String args[]) throws IOException {
  Properties prop = new Properties();
  OutputStream out = new FileOutputStream("D:\workspace\JavaStudy\src\test\test.properties");
/**

新增邏輯：
1.必須先讀取文件原有內容
2.增加新的記錄以后，再一起保存
*/
//1.先讀取文件原有內容
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.增加你需要增加的屬性內容
toSaveMap.put("name", "zhang san");
toSaveMap.put("age", "25");
prop.putAll(toSaveMap);
prop.store(out, "==== after add ====");
/**

修改邏輯：重新設置對應Key的值即可，非常簡單
*/
prop.clear();
toSaveMap.put("name", "li si");
toSaveMap.put("age", "26");
prop.putAll(toSaveMap);
prop.store(out, "==== after modify ====");
/**

刪除邏輯：找到對應的key，刪除即可
*/

prop.clear();
toSaveMap.remove("name");
prop.putAll(toSaveMap);
prop.store(out, "==== after remove ===="));
/**

查詢邏輯：
*/
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"));
}</pre>