java 操作Properties文件

package cn.studio.util;

import java.io.*;
import java.net.URISyntaxException;
import java.net.URL;

import java.util.Properties;

public class Properties_Utils {

public static Properties props;
public static InputStream in;
public static OutputStream out;

static {
try {
URL url = Properties_Utils.class.getClassLoader().getResource(
"time.properties");

File file;
file = new File(url.toURI());

out = new FileOutputStream(file);
props = new Properties();
in = Properties_Utils.class.getResourceAsStream("/user.properties");
props.load(in);
} catch (FileNotFoundException e1) {
e1.printStackTrace();
} catch (URISyntaxException e1) {
e1.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}

// 根据key读取value
public static String readValue(String key) {
String value = props.getProperty(key);
return value;

}

// 根据key增加值value
public static String writeValue(String key, String value) {
props.setProperty(key, value);
return value;
}

public static void addProperty(String key, String value) {

props.setProperty(key, value);

try {
props.store(out, null);
} catch (IOException e) {
e.printStackTrace();
}

}

// 查找某个值是否在key中
public static boolean isInKey(String key, String value) {
System.out.println(readValue(key));
String[] values = readValue(key).split(",");
for (String v : values) {
if (v.equals(value)) {
return true;
}
}
return false;
}

}