Code snippet:. Properties Property File Operations Tool Class & JSON tool class

Absrtact: Original creation Place: www.bysocket.com Mason bysocket Hope reprint, keep abstract, thank you! "Your Special"-Masons

First, java.util.Properties API & Case

Java.util.Properties is a collection of properties. The common APIs are as follows:

• Load (InputStream instream) reads a property from the input stream
• GetProperty (String key), based on key, gets the property value
• Getordefault (Object key, V defaultvalue) depending on the key object, getting the property value requires a strong turn

First add/main/resources/fast.properties under the resources directory:

Fast.framework.name=fastfast.framework.author=bysocketfast.framework.age=1

Then directly on the code Propertyutil.java:

/** *. Properties Property File Operation Tool Class * * Created by Bysocket on 16/7/19.    */public class Propertyutil {private static final Logger Logger = Loggerfactory.getlogger (Propertyutil.class);    /**. Properties Property filename suffix */public static final String property_file_suffix= ". Properties"; /** * Based on the property filename, Get Properties * * @param propsfilename * @return */public static properties GetProperties (STR        ing Propsfilename) {if (Stringutils.isempty (propsfilename)) throw new IllegalArgumentException ();        Properties Properties = new properties ();        InputStream inputstream = null;  try {try {/** add filename suffix */if (Propsfilename.lastindexof (property_file_suffix) = =                -1) {propsfilename + = Property_file_suffix; } InputStream = Thread.CurrentThread (). Getcontextclassloader (). getResourceAsStream (                Propsfilename);        if (null! = InputStream)            Properties.load (InputStream);                } finally {if (null! = InputStream) {inputstream.close ();            }}} catch (IOException e) {logger.error ("Error loading property file!", e);        throw new RuntimeException (e);    } return properties; }/** * Based on key, get property value * * @param properties * @param key * @return */public static String get    String (Properties Properties, string key) {return Properties.getproperty (key);    }/** * Based on key, gets the property value * * @param properties * @param key * @param defaultvalue * @return * * public static string Getstringordefault (properties properties, string key, String defaultvalue) {return propertie    S.getproperty (Key,defaultvalue);      }/** * Based on key, get property value * * @param properties * @param key * @param defaultvalue * @param <V> * @return */public static <V> V GetorDefault (Properties Properties, String key, V DefaultValue) {return (v) properties.getordefault (key,defaultvalue); }}

The

UT is as follows:

/** * {@link propertyutil} test Case * <p/> * Created by Bysocket on 16/7/19. */public class Propertyutiltest {@Test public void testgetproperties () {Properties properties = Propertyuti        L.getproperties ("fast");        String fastframeworkname = Properties.getproperty ("Fast.framework.name");        String AuthorName = Properties.getproperty ("Fast.framework.author");        Object age = Properties.getordefault ("Fast.framework.age", 10);        Object defaultval = Properties.getordefault ("Fast.framework.null", 10);        System.out.println (Fastframeworkname);        System.out.println (AuthorName);        System.out.println (Age.tostring ());    System.out.println (Defaultval.tostring ());        } @Test public void Testgetstring () {Properties Properties = propertyutil.getproperties ("Fast");        String fastframeworkname = propertyutil.getstring (Properties, "Fast.framework.name"); String AuthorName = propertyutil.getstring (Properties, "Fast.framework.author");        System.out.println (Fastframeworkname);    System.out.println (AuthorName);        } @Test public void Testgetordefault () {Properties Properties = propertyutil.getproperties ("Fast");        Object age = Propertyutil.getordefault (Properties, "Fast.framework.age", 10);        Object defaultval = Propertyutil.getordefault (Properties, "Fast.framework.null", 10);        System.out.println (Age.tostring ());    System.out.println (Defaultval.tostring ()); }}

Run Console:

110fastbysocket110fastbysocket

Related code Share on Github homepage

Ii. The case of JACKSON

First, add a maven dependency:

                                <!--Jackson--><dependency><groupid>org.codehaus.jackson</groupid><artifactid> Jackson-mapper-asl</artifactid><version>1.9.13</version></dependency><dependency ><groupId>org.codehaus.jackson</groupId><artifactId>jackson-jaxrs</artifactId>< Version>1.9.13</version></dependency>

Then directly on the code jsonutil:

/** * JSON Tool class * <p/> * Created by Bysocket on 16/7/19.    */public class Jsonutil {private static final Logger Logger = Loggerfactory.getlogger (Jsonutil.class);    /** * Default JSON class **/private static final Objectmapper mapper = new Objectmapper (); /** * Convert a Java object to a JSON string * * @param object * @param <T> * @return */public static &LT ;        T> string tojsonstring (T object) {string jsonstr;        try {jsonstr = Mapper.writevalueasstring (object);            } catch (Exception e) {logger.error ("Java Object Can ' t covert to JSON string!");        throw new RuntimeException (e);    } return JSONSTR; /** * Convert JSON string to Java Object * * @param JSON * @param clazz * @param <T> * @return *        /public static <T> T Toobject (String JSON, class<t> clazz) {T object;        try {object = Mapper.readvalue (JSON, clazz); } catch (ExceptiOn e) {logger.error ("JSON String Can ' t covert to Java object!");        throw new RuntimeException (e);    } return object; }}

The

UT is as follows:

/** * {@link jsonutil} test Case * <p/> * Created by Bysocket on 16/7/19. */public class Jsonutiltest {@Test public void testtojsonstring () {Jsonobject jsonobject = new Jsonobject (1        , "Bysocket", 33);        String jsonstr = jsonutil.tojsonstring (Jsonobject);    Assert.assertequals ("{\" age\ ": 1,\" name\ ": \" bysocket\ ", \" id\ ":"), JSONSTR); } @Test (expected = runtimeexception.class) public void Testtojsonstringerror () {jsonutil.tojsonstring (System    . out);        } @Test public void Testtoobject () {Jsonobject jsonobject = new Jsonobject (1, "Bysocket", 33);        String jsonstr = jsonutil.tojsonstring (Jsonobject);        Jsonobject resultobject = Jsonutil.toobject (Jsonstr, Jsonobject.class);    Assert.assertequals (Jsonobject.tostring (), resultobject.tostring ()); } @Test (expected = runtimeexception.class) public void Testtoobjecterror () {Jsonutil.toobject ("{int:1}", JSO    Nobject.class);    }}class jsonobject {int age; String name;    Integer ID;        Public Jsonobject () {} public Jsonobject (int., String name, Integer id) {this.age = age;        THIS.name = name;    This.id = ID;    } public int Getage () {return age;    public void Setage (int.) {this.age = age;    } public String GetName () {return name;    } public void SetName (String name) {this.name = name;    } public Integer GetId () {return id;    } public void SetId (Integer id) {this.id = ID;  } @Override Public String toString () {return ' jsonobject{' + ' age= ' + Age + ',    Name= ' + name + ' \ ' + ', id= ' + ID + '} '; }}

Run Console (Exception information thrown):

16/07/19 23:09:13 ERROR util. Jsonutil:json String Can ' t covert to Java OBJECT!16/07/19 23:09:13 ERROR util. Jsonutil:java Object Can ' t covert to JSON string!

Third, summary

related code Share on the Github homepage Please see the Java Small partner multi-communication multi-comment improvement. Reference Huang Yong Smart

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Code snippet:. Properties Property File Operations Tool Class & JSON tool class