Tips for using the built-in variable props of BeanShell

1 Basic introduction

props mapping java.util Of Properties class
And vars The effect is roughly the same , The difference is vars Is to read and write variables , and props It is mainly used to read and write attributes
vars Can only be used within the current thread group ,props Can be used across thread groups , Because attributes can cross thread groups, but variables don't
vars Save only String perhaps Object,props It can be Hashtable perhaps Object
java.util.Properties This class is thread-safe ; Multiple threads can share one Properties object , Without external synchronization
Official documents ：https://tool.oschina.net/uploads/apidocs/jdk-zh/java/util/Properties.html

2 Common methods

2.1 getProperty

Method statement
public String getProperty(String key)

public String getProperty(String key, String defaultValue)： When key If it doesn't exist, it returns the default value

function ： Searches for properties in this property list with the specified key , If the key is not found in this attribute list , Then recursively check the list of default attributes and their default values . If the attribute is not found , This method returns null

// Attributes exist 
encoding = props.getProperty("sampleresult.default.encoding");
log.info("encoding is "+ encoding);

// Property does not exist 
shanghia =  props.getProperty("shanghia");
log.info("shanghia is " + shenzhen);

// Property does not exist 
shanghia = props.getProperty("shanghia","default value");
log.info("shanghia is "+ shanghia);

result ：

2.2 setProperty

Method statement
public Object setProperty(String key,String value)

function ： Setting property values

props.setProperty("shenzhn","shanghia");
shenzhn = props.getProperty("shenzhn");
log.info("shenzhn is "+shenzhn);

result ：

2.3 propertyNames

Method statement
public Enumeration<?> propertyNames()

function ： Returns an enumeration of all keys in the property list , If the key with the same name is not found in the main property list , Include the different keys in the default attribute list

pnames = props.propertyNames();
pnames.each{
    
	log.info(it)
}

result ：

2.4 size

Method statement
public int size()

function ： Returns how many properties there are

pnum =props.size();
log.info("pnum is "+pnum);

result ：