JSON serialization Java Tool class

JSON serialization Common tool Class (Java)

> to support the normal use of this tool class, first import the following jar packages

The 1.lombok package is a jar package that simplifies Java redundancy code and is very handy in real-world development.

Import Lombok coordinates in MAVEN Pom file

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.16.18</version>
</dependency>

2.json Serialized JAR Package

Import Lombok coordinates in MAVEN Pom file

<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-mapper-asl</artifactId>
    <version>1.9.12</version>
</dependency>

3.String Processing of JAR packages

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-lang3</artifactId>
    <version>3.5</version>
</dependency>

The tool classes are as follows:

Import lombok.extern.slf4j.Slf4j;
Import Org.apache.commons.lang.StringUtils;
Import Org.codehaus.jackson.map.DeserializationConfig;
Import Org.codehaus.jackson.map.ObjectMapper;
Import Org.codehaus.jackson.map.SerializationConfig;
Import org.codehaus.jackson.map.annotate.JsonSerialize;
Import Org.codehaus.jackson.type.JavaType;
Import org.codehaus.jackson.type.TypeReference;

Import Java.text.SimpleDateFormat;

@Slf4j
public class Jsonutil {

private static Objectmapper Objectmapper = new Objectmapper ();
private static final String Standard_format = "Yyyy-mm-dd HH:mm:ss";

static {
All fields of the object are listed in the
Objectmapper.setserializationinclusion (JsonSerialize.Inclusion.ALWAYS);
Cancels the default conversion timestamps form
Objectmapper.configure (SerializationConfig.Feature.WRITE_DATES_AS_TIMESTAMPS, false);
Error ignoring empty bean to JSON
Objectmapper.configure (SerializationConfig.Feature.FAIL_ON_EMPTY_BEANS, false);
All date formats are unified into the following styles, i.e. Yyyy-mm-dd HH:mm:ss
Objectmapper.setdateformat (New SimpleDateFormat (Standard_format));
Ignoring the existence of a JSON string, but there is no corresponding attribute in the Java object. Prevent errors
Objectmapper.configure (DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);
}

public static <T> String obj2string (T obj) {
if (obj = = null) {
return null;
}
try {
return obj instanceof String? (String) obj:objectMapper.writeValueAsString (obj);
} catch (Exception e) {
Log.warn ("Parse Object to String error", E);
return null;
}
}

public static <T> String obj2stringpretty (T obj) {
if (obj = = null) {
return null;
}
try {
return obj instanceof String? (String) Obj:objectMapper.writerWithDefaultPrettyPrinter (). writevalueasstring (obj);
} catch (Exception e) {
Log.warn ("Parse Object to String error", E);
return null;
}
}


public static <T> T string2obj (String str, class<t> clazz) {
if (Stringutils.isempty (str) | | | clazz = = NULL) {
return null;
}

try {
Return Clazz.equals (string.class)? (T) Str:objectMapper.readValue (str, clazz);
} catch (Exception e) {
Log.warn ("Parse String to Object error", E);
return null;
}
}


public static <T> T string2obj (String str, typereference<t> typereference) {
if (Stringutils.isempty (str) | | | typereference = = NULL) {
return null;
}
try {
Return (T) (Typereference.gettype () equals (String.class) str:objectMapper.readValue (str, typereference));
} catch (Exception e) {
Log.warn ("Parse String to Object error", E);
return null;
}
}


public static <T> T string2obj (String str, class<?> collectionclass, Class<?> .... elementclasses) {
Javatype Javatype = Objectmapper.gettypefactory (). Constructparametrictype (Collectionclass, elementClasses);
try {
return Objectmapper.readvalue (str, javatype);
} catch (Exception e) {
Log.warn ("Parse String to Object error", E);
return null;
}
}

This tool class is very general, recommended, the parameters can be adjusted according to their own needs.

JSON serialization Java Tool class