web项目读写properties文件

 

import java.io.BufferedInputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.ArrayList;

import java.util.Enumeration;

import java.util.HashMap;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Properties;

import java.util.Set;

 

import jxl.demo.Demo;

public class PropertiesHandle {

 

 

//根据key读取value

public static String readValue(String filePath,String key) {

Properties props = new Properties();

try {

InputStream in = new BufferedInputStream(new FileInputStream(filePath));

props.load(in);

String value = props.getProperty (key);

System.out.println(key+":"+value);

return value;

} catch (Exception e) {

e.printStackTrace();

return null;

}

}

//根据Key移除value

public static boolean removeValue(String filePath,String key) {

Properties props = new Properties();

try {

InputStream in = new BufferedInputStream(new FileInputStream(filePath));

props.load(in);

OutputStream fos = new FileOutputStream(filePath);

props.remove(key);

props.store(fos, "Delete '" + key + "' value");

return true;

} catch (Exception e) {

e.printStackTrace();

return false;

}

}

 

//读取properties的全部信息

@SuppressWarnings("unchecked")

public static List<String> readProperties(String filePath) {

List<String> svnList=new ArrayList<String>();

Properties props = new Properties();

try {

InputStream in = new BufferedInputStream (new FileInputStream(filePath));

props.load(in);

Enumeration en = props.propertyNames();

while (en.hasMoreElements()) {

String key = (String) en.nextElement();

if (key.contains("_")&&!key.contains("DAS")) {

svnList.add(key);

}

 

//String Property = props.getProperty (key);

//System.out.println(key+":"+Property);

}

 

} catch (Exception e) {

 

e.printStackTrace();

}

return svnList;

}

/***

* 

* @param filePath

* @return 二维数组

* 读取所有服务svn的键值对

*/

public static String[][] readAllProperties(String filePath) {

Map<String,String> map = new HashMap<String, String>();

String[][] ss=null;

Properties props = new Properties();

try {

InputStream in = new BufferedInputStream (new FileInputStream(filePath));

props.load(in);

Enumeration en = props.propertyNames();

while (en.hasMoreElements()) {

String key = (String) en.nextElement();    //key 

String Property = props.getProperty (key); //value

map.put(key, Property);

}

if (null!=map) {

Set<String> set = map.keySet();

Iterator<String> it = set.iterator();

ss = new String[map.size()][2];

for (int i = 0; i < map.size(); i++) {

ss[i][0] = it.next();

ss[i][1] = map.get(ss[i][0]);

}

for (int i = 0; i < ss.length; i++) {

for (int j = 0; j < ss[i].length; j++) {

System.out.println(ss[i][j]+"\t");

}

}

}

 

} catch (Exception e) {

 

e.printStackTrace();

}

return ss;

}

 

//写入properties信息

public static void writeProperties(String filePath,String parameterName,String parameterValue) {

Properties prop = new Properties();

try {

InputStream fis = new FileInputStream(filePath);

//从输入流中读取属性列表（键和元素对）

prop.load(fis);

//调用 Hashtable 的方法 put。使用 getProperty 方法提供并行性。

//强制要求为属性的键和值使用字符串。返回值是 Hashtable 调用 put 的结果。

OutputStream fos = new FileOutputStream(filePath);

prop.setProperty(parameterName, parameterValue);

//以适合使用 load 方法加载到 Properties 表中的格式，

//将此 Properties 表中的属性列表（键和元素对）写入输出流

prop.store(fos, "Update '" + parameterName + "' value");

} catch (IOException e) {

System.err.println("Visit "+filePath+" for updating "+parameterName+" value error");

}

}

 

public static void main(String[] args) {

//获取web项目下properties的绝对路径

//String path = Demo.class.getClassLoader().getResource("taskconfig.properties").getPath();

//String lasttasktime1 = PropertiesHandle.readValue(path, "lasttasktime1");

//if (lasttasktime1.isEmpty()) {

//lasttasktime1="1";

//}

//System.out.println(lasttasktime1);

//PropertiesHandle.writeProperties(path, "lasttasktime1", "18:00:00");

}

 

}