java加載properties文件的六種方法總結
java加載properties文件的六中基本方式實現
java加載properties文件的方式主要分為兩大類：一種是通過import java.util.Properties類中的load(InputStream in)方法加載；
另一種是通過import java.util.ResourceBundle類的getBundle(String baseName)方法加載。
注意：一定要區分路徑格式
實現代碼如下:
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package
com.util;
import
java.io.FileInputStream;
import
java.io.FileNotFoundException;
import
java.io.IOException;
import
java.io.InputStream;
import
java.util.Properties;
import
java.util.PropertyResourceBundle;
import
java.util.ResourceBundle;
public
class
PropertiesUtil {
private
static
String basePath =
"src/prop.properties"
;
private
static
String name =
""
;
private
static
String nickname =
""
;
private
static
String password =
""
;
/**
* 一、 使用java.util.Properties類的load(InputStream in)方法加載properties文件
*
*/
public
static
String getName1() {
try
{
Properties prop =
new
Properties();
InputStream is =
new
FileInputStream(basePath);
prop.load(is);
name = prop.getProperty(
"username"
);
}
catch
(FileNotFoundException e) {
e.printStackTrace();
}
catch
(IOException e) {
e.printStackTrace();
}
return
name;
}
/**
* 二、 使用class變量的getResourceAsStream()方法
* 注意：getResourceAsStream()讀取路徑是與本類的同一包下
*
*/
public
static
String getName2() {
Properties prop =
new
Properties();
InputStream is = PropertiesUtil.
class
.getResourceAsStream(
"/com/util/prop.properties"
);
try
{
prop.load(is);
name = prop.getProperty(
"username"
);
}
catch
(IOException e) {
e.printStackTrace();
}
return
name;
}
/**
* 三、
* 使用class.getClassLoader()所得到的java.lang.ClassLoader的getResourceAsStream()方法
* getResourceAsStream(name)方法的參數必須是包路徑+文件名+.后綴 否則會報空指針異常
*
*/
public
static
String getName3() {
Properties prop =
new
Properties();
InputStream is = PropertiesUtil.
class
.getClassLoader()
.getResourceAsStream(
"com/util/prop.properties"
);
try
{
prop.load(is);
}
catch
(IOException e) {
e.printStackTrace();
}
return
name;
}
/**
* 四、 使用java.lang.ClassLoader類的getSystemResourceAsStream()靜態方法
* getSystemResourceAsStream()方法的參數格式也是有固定要求的
*
*/
public
static
String getName4() {
Properties prop =
new
Properties();
InputStream is = ClassLoader
.getSystemResourceAsStream(
"com/util/prop.properties"
);
try
{
prop.load(is);
name = prop.getProperty(
"username"
);
}
catch
(IOException e) {
e.printStackTrace();
}
return
name;
}
/**
* 五、 使用java.util.ResourceBundle類的getBundle()方法
* 注意：這個getBundle()方法的參數只能寫成包路徑+properties文件名，否則將拋異常
*
*/
public
static
String getName5() {
ResourceBundle rb = ResourceBundle.getBundle(
"com/util/prop"
);
password = rb.getString(
"password"
);
return
password;
}
/**
* 六、 使用java.util.PropertyResourceBundle類的構造函數
*
*/
public
static
String getName6() {
try
{
InputStream is =
new
FileInputStream(basePath);
ResourceBundle rb =
new
PropertyResourceBundle(is);
nickname = rb.getString(
"nickname"
);
}
catch
(FileNotFoundException e) {
e.printStackTrace();
}
catch
(IOException e) {
e.printStackTrace();
}
return
nickname;
}
/**
* 測試
*
*/
public
static
void
main(String[] args) {
System.out.println(
"name1:"
+ PropertiesUtil.getName1());
System.out.println(
"name2:"
+ PropertiesUtil.getName2());
System.out.println(
"name3:"
+ PropertiesUtil.getName3());
System.out.println(
"name4:"
+ PropertiesUtil.getName4());
System.out.println(
"password:"
+ PropertiesUtil.getName5());
System.out.println(
"nickname:"
+ PropertiesUtil.getName6());
}
}
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