com.github.miemiedev.mybatis.paginator.support
类 PropertiesHelper

java.lang.Object
  com.github.miemiedev.mybatis.paginator.support.PropertiesHelper

public class PropertiesHelper
extends Object

Properties的操作的工具类,为Properties提供一个代理增加相关工具方法如 getRequiredString(),getInt(),getBoolean()等方法 并可以通过systemPropertiesMode属性指定是否搜索System.getProperty()及System.getenv()来查找值. 默认不搜索系统属性

 使用1:
 public class ConnectionUtils {
     static Properties properties = new Properties(); 
     // ... do load properties 
     
     // delegate to properties
           static PropertiesHelper props = new PropertiesHelper(properties);
     public static Connection getConnection() {
                // use getRequiredProperty() 
                DriverManager.getConnection(props.getRequiredString("jdbc.url"));
     }
 }
 指定是否搜索系统属性:
 new PropertiesHelper(properties,PropertiesHelper.SYSTEM_PROPERTIES_MODE_OVERRIDE)
 

作者：

badqiu

字段摘要

static int	SYSTEM_PROPERTIES_MODE_FALLBACK Check system properties if not resolvable in the specified properties.
static int	SYSTEM_PROPERTIES_MODE_NEVER Never check system properties.
static int	SYSTEM_PROPERTIES_MODE_OVERRIDE Check system properties first, before trying the specified properties.

构造方法摘要

PropertiesHelper(Properties p)

PropertiesHelper(Properties p, int systemPropertiesMode)

方法摘要

void	clear()
boolean	contains(Object value)
boolean	containsKey(Object key)
boolean	containsValue(Object value)
Enumeration<Object>	elements()
Set<Map.Entry<Object,Object>>	entrySet()
Object	get(Object key)
String	getAndTryFromSystem(String key) 尝试从System.getProperty(key)及System.getenv(key)得到值
Boolean	getBoolean(String key)
boolean	getBoolean(String key, boolean defaultValue)
Double	getDouble(String key)
double	getDouble(String key, double defaultValue)
Float	getFloat(String key)
float	getFloat(String key, float defaultValue)
int	getInt(String key, int defaultValue)
int[]	getIntArray(String key)
Integer	getInteger(String key)
Long	getLong(String key)
long	getLong(String key, long defaultValue)
String	getNullIfBlank(String key)
String	getNullIfEmpty(String key)
Properties	getProperties()
String	getProperty(String key)
String	getProperty(String key, String defaultValue) delegate method start
boolean	getRequiredBoolean(String key)
Double	getRequiredDouble(String key)
Float	getRequiredFloat(String key)
int	getRequiredInt(String key)
Long	getRequiredLong(String key)
String	getRequiredString(String key)
Properties	getStartsWithProperties(String prefix)
String[]	getStringArray(String key)
boolean	isEmpty()
Enumeration<Object>	keys()
Set<Object>	keySet()
void	list(PrintStream out)
void	list(PrintWriter out)
void	load(InputStream inStream)
void	loadFromXML(InputStream in)
Enumeration<?>	propertyNames()
Object	put(Object key, Object value)
void	putAll(Map<? extends Object,? extends Object> t)
Object	remove(Object key)
void	save(OutputStream out, String comments) 已过时。
void	setProperties(Properties props)
Object	setProperty(String key, boolean value)
Object	setProperty(String key, double value)
Object	setProperty(String key, float value)
Object	setProperty(String key, int value) setProperty(String key,int value) ... start
Object	setProperty(String key, long value)
Object	setProperty(String key, String value)
int	size()
void	store(OutputStream out, String comments)
void	storeToXML(OutputStream os, String comment)
void	storeToXML(OutputStream os, String comment, String encoding)
String	toString()
Collection<Object>	values()

从类 java.lang.Object 继承的方法

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

字段详细信息

SYSTEM_PROPERTIES_MODE_NEVER

public static final int SYSTEM_PROPERTIES_MODE_NEVER

Never check system properties.

另请参见：

常量字段值

SYSTEM_PROPERTIES_MODE_FALLBACK

public static final int SYSTEM_PROPERTIES_MODE_FALLBACK

Check system properties if not resolvable in the specified properties. This is the default.

另请参见：

常量字段值

SYSTEM_PROPERTIES_MODE_OVERRIDE

public static final int SYSTEM_PROPERTIES_MODE_OVERRIDE

Check system properties first, before trying the specified properties. This allows system properties to override any other property source.

另请参见：

常量字段值

构造方法详细信息

PropertiesHelper

public PropertiesHelper(Properties p)

PropertiesHelper

public PropertiesHelper(Properties p,
                        int systemPropertiesMode)

方法详细信息

getProperties

public Properties getProperties()

setProperties

public void setProperties(Properties props)

getRequiredString

public String getRequiredString(String key)

getNullIfBlank

public String getNullIfBlank(String key)

getNullIfEmpty

public String getNullIfEmpty(String key)

getAndTryFromSystem

public String getAndTryFromSystem(String key)

尝试从System.getProperty(key)及System.getenv(key)得到值

返回：

getInteger

public Integer getInteger(String key)

getInt

public int getInt(String key,
                  int defaultValue)

getRequiredInt

public int getRequiredInt(String key)

getLong

public Long getLong(String key)

getLong

public long getLong(String key,
                    long defaultValue)

getRequiredLong

public Long getRequiredLong(String key)

getBoolean

public Boolean getBoolean(String key)

getBoolean

public boolean getBoolean(String key,
                          boolean defaultValue)

getRequiredBoolean

public boolean getRequiredBoolean(String key)

getFloat

public Float getFloat(String key)

getFloat

public float getFloat(String key,
                      float defaultValue)

getRequiredFloat

public Float getRequiredFloat(String key)

getDouble

public Double getDouble(String key)

getDouble

public double getDouble(String key,
                        double defaultValue)

getRequiredDouble

public Double getRequiredDouble(String key)

setProperty

public Object setProperty(String key,
                          int value)

setProperty(String key,int value) ... start

setProperty

public Object setProperty(String key,
                          long value)

setProperty

public Object setProperty(String key,
                          float value)

setProperty

public Object setProperty(String key,
                          double value)

setProperty

public Object setProperty(String key,
                          boolean value)

getStringArray

public String[] getStringArray(String key)

getIntArray

public int[] getIntArray(String key)

getStartsWithProperties

public Properties getStartsWithProperties(String prefix)

getProperty

public String getProperty(String key,
                          String defaultValue)

delegate method start

getProperty

public String getProperty(String key)

setProperty

public Object setProperty(String key,
                          String value)

clear

public void clear()

entrySet

public Set<Map.Entry<Object,Object>> entrySet()

propertyNames

public Enumeration<?> propertyNames()

contains

public boolean contains(Object value)

containsKey

public boolean containsKey(Object key)

containsValue

public boolean containsValue(Object value)

elements

public Enumeration<Object> elements()

get

public Object get(Object key)

isEmpty

public boolean isEmpty()

keys

public Enumeration<Object> keys()

keySet

public Set<Object> keySet()

list

public void list(PrintStream out)

list

public void list(PrintWriter out)

load

public void load(InputStream inStream)
          throws IOException

抛出：

IOException

loadFromXML

public void loadFromXML(InputStream in)
                 throws IOException,
                        InvalidPropertiesFormatException

抛出：

IOException

InvalidPropertiesFormatException

put

public Object put(Object key,
                  Object value)

putAll

public void putAll(Map<? extends Object,? extends Object> t)

remove

public Object remove(Object key)

save

public void save(OutputStream out,
                 String comments)

已过时。

size

public int size()

store

public void store(OutputStream out,
                  String comments)
           throws IOException

抛出：

IOException

storeToXML

public void storeToXML(OutputStream os,
                       String comment,
                       String encoding)
                throws IOException

抛出：

IOException

storeToXML

public void storeToXML(OutputStream os,
                       String comment)
                throws IOException

抛出：

IOException

values

public Collection<Object> values()

toString

public String toString()

覆盖：

类 Object 中的 toString