通用Propterties工具类，兼容读jar同级目录的文件。
1.前言。
properties文件的写方法比较不好用，折中写了个通用类。
2.例子。
3.后记。
如果是要读jar里面的src直属的properties,直接用ResourseBundle就可以了。
properties文件的写方法比较不好用，折中写了个通用类。
2.例子。
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
/**
* 读取Properties综合类
*
* @author lijn 2014-02-25
*/
public class PropertiesUtil {
/**
* 得到某一个类的路径
*
* @param name
* @return
*/
public static String getPath(Class name) {
String strResult = null;
if (System.getProperty("os.name").toLowerCase().indexOf("window") > -1) {
strResult = name.getResource("/").toString().replace("file:/", "")
.replace("%20", " ");
} else {
strResult = name.getResource("/").toString().replace("file:", "")
.replace("%20", " ");
}
return strResult;
}
/**
* 读取所有的property
*
* @param filename
* properties文件路径
* @return 所有的property的集合(map形式)
*/
@SuppressWarnings("unchecked")
public static Map<String, String> getPropties(String filename) {
if (null == filename) {
return null;
}
String filePath = getPath(PropertiesUtil.class) + filename;
Properties props = new Properties();
InputStream in = null;
try {
in = new BufferedInputStream(new FileInputStream(filePath));
props.load(in);
Map<String, String> map = new HashMap<String, String>();
Enumeration en = props.propertyNames();
while (en.hasMoreElements()) {
String key = (String) en.nextElement();
String Property = props.getProperty(key);
map.put(key, Property);
}
return map;
// 关闭资源
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
/**
* 获取某个property的值
*
* @param filename
* 文件名
* @param key
* property的key
* @return property的value
*/
public static String setProp(String filename, String key, String value) {
if (null == filename || null == key) {
return null;
}
String filePath = getPath(PropertiesUtil.class) + filename;
Properties props = new Properties();
FileOutputStream out = null;
InputStream in = null;
try {
in = new BufferedInputStream(new FileInputStream(filePath));
props.load(in);
out = new FileOutputStream(new File(filePath));
props.setProperty(key, value);
props.store(out, "update");
// 关闭资源
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
out.close();
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
/**
* 获取某个property的值
*
* @param filename
* 文件名
* @param key
* property的key
* @return property的value
*/
public static String getProp(String filename, String key) {
if (null == filename || null == key) {
return null;
}
String filePath = getPath(PropertiesUtil.class) + filename;
Properties props = new Properties();
InputStream in = null;
try {
in = new BufferedInputStream(new FileInputStream(filePath));
props.load(in);
return props.getProperty(key);
// 关闭资源
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
/**
* 需要将config.properies文件放到和本类同级目录下面
*
* @param filename
* @param key
* @param value
* @return
*/
public static String setJarProp(String filename, String key, String value) {
if (null == filename || null == key) {
return null;
}
String filePath = getPath(PropertiesUtil.class) + filename;
Properties props = new Properties();
FileOutputStream out = null;
InputStream in = null;
try {
in = PropertiesUtil.class.getResourceAsStream("config.properties");
// System.out.println(PropertiesUtil.class.getClassLoader().getResource("config.properties"));
BufferedInputStream b2 = new BufferedInputStream(in);
props.load(b2);
out = new FileOutputStream(filePath);
props.setProperty(key, value);
props.store(out, "update");
// 关闭资源
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
out.close();
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
/**
* 读写jar外的properties文件
*
* @param filename
* @param key
* @param value
*/
public static void setExtralProperty(String filename, String key,
String value) {
if (null == filename || null == key) {
return;
}
String outPathString = System.getProperty("java.class.path");
outPathString = outPathString.substring(0, outPathString
.lastIndexOf("\\") + 1);
String filePath = outPathString + filename;
Properties props = new Properties();
FileOutputStream out = null;
BufferedInputStream b2 = null;
try {
b2 = new BufferedInputStream(new FileInputStream(filePath));
props.load(b2);
out = new FileOutputStream(new File(filePath));
props.setProperty(key, value);
props.store(out, "update");
// 关闭资源
} catch (FileNotFoundException e) {
setProp(filename,key,value);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if(null!=out){
out.close();
}
if(null!=b2){
b2.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/**
* 以行的形式写ja内的文件
*
* @param filename
* @param key
* @param value
*/
public static void writeLineInerFile(String filename, String content) {
if (null == filename || null == content) {
return;
}
String filePath = getPath(PropertiesUtil.class) + filename;
FileOutputStream out = null;
BufferedInputStream b2 = null;
byte[] cont=new byte[4];
String contentResult="";
try {
//先读取源文件的内容，再追加内容
b2 = new BufferedInputStream(new FileInputStream(filePath));
int res=b2.read(cont);
while(res!=-1){
contentResult=contentResult+new String(cont);
res=b2.read(cont);
}
//追加
contentResult+=content;
out = new FileOutputStream(new File(filePath));
out.write(contentResult.getBytes());
// 关闭资源
} catch (FileNotFoundException e) {
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if(null!=out){
out.close();
}
if(null!=b2){
b2.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/**
* 以行的形式写jar外的文件
*
* @param filename
* @param key
* @param value
*/
public static void writeLineExtralFile(String filename, String content) {
if (null == filename || null == content) {
return;
}
String outPathString = System.getProperty("java.class.path");
outPathString = outPathString.substring(0, outPathString
.lastIndexOf("\\") + 1);
String filePath = outPathString + filename;
FileOutputStream out = null;
BufferedInputStream b2 = null;
byte[] cont=new byte[1024];
String contentResult="";
try {
//先读取源文件的内容，再追加内容
b2 = new BufferedInputStream(new FileInputStream(filePath));
int res=b2.read(cont);
while(res!=-1){
contentResult=contentResult+new String(cont);
res=b2.read(cont);
}
//追加
contentResult+=content;
out = new FileOutputStream(filePath);
out.write(contentResult.getBytes());
// 关闭资源
} catch (FileNotFoundException e) {
writeLineInerFile(filename,content);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if(null!=out){
out.close();
}
if(null!=b2){
b2.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
/**
* 读jar外的properties文件的属性
*
* @param filename
* @param key
* @param value
*/
public static String getExtralProperty(String filename, String key) {
if (null == filename || null == key) {
return null;
}
String outPathString = System.getProperty("java.class.path");
outPathString = outPathString.substring(0, outPathString
.lastIndexOf("\\") + 1);
String filePath = outPathString + filename;
Properties props = new Properties();
BufferedInputStream b2=null;
try {
b2 = new BufferedInputStream(new FileInputStream(filePath));
props.load(b2);
return props.getProperty(key);
// 关闭资源
} catch (FileNotFoundException e) {
return getProp(filename,key);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if(null!=b2){
b2.close();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
public static void main(String[] args) throws IOException {
writeLineExtralFile("error.txt","fiowe");
}
}
3.后记。
如果是要读jar里面的src直属的properties,直接用ResourseBundle就可以了。
ResourceBundle resourceBundle = ResourceBundle.getBundle(filename
.replace(".properties", ""));
String temp = resourceBundle.getString(key);