项目中需要用到操作properties文件中的数据,记录一下
package com.bonc.savepic.save; import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties; /**
* @Author clj
* @SinceDate 2019/3/26 17:05
* @Description
*/
public class PropertiesUtil { /**
* 获取Properties对象
* @return
*/
public static Properties getProperties(){
Properties properties = new Properties();
InputStream inputStream = null;
try {
//data.properties在resources目录下
inputStream = PropertiesUtil.class.getClassLoader().getResourceAsStream("data.properties");
properties.load(inputStream);
} catch (FileNotFoundException e) {
System.out.println("data.properties文件未找到!");
} catch (IOException e) {
System.out.println("出现IOException");
} finally {
try {
if (null != inputStream){
inputStream.close();
}
} catch (IOException e) {
System.out.println("data.properties文件流关闭出现异常");
}
}
return properties;
} /**
* 根据key查询value值
* @param key key
* @return
*/
public static String getValue(String key){
Properties properties = getProperties();
String value = properties.getProperty(key);
return value;
} /**
* 新增/修改数据
* @param key
* @param value
*/
public static void setValue(String key, String value){
Properties properties = getProperties();
properties.setProperty(key, value);
//此处获取的路径是target下classes //这里的path是项目文件的绝对路径
//先获取项目绝对路径：Thread.currentThread().getContextClassLoader().getResource("").getPath();
//然后在项目路径后面拼接"properties/sysConfig.properties";
// 原注释
String path = Thread.currentThread().getContextClassLoader().getResource("").getPath();
path = path + "data.properties";
FileOutputStream fileOutputStream = null;
try {
fileOutputStream = new FileOutputStream(path);
properties.store(fileOutputStream, "注释");
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (null != fileOutputStream){
fileOutputStream.close();
}
} catch (IOException e) {
System.out.println("data.properties文件流关闭出现异常");
}
}
} /**
* 删除和修改只有语句不同
* properties.remove(key);
*/
}