在Java中,如果我想将一些JSON转换为POJO(或副版本),我将使用Gson甚至FlexJson在某种mapper对象中为我做转换:
public interface JsonMapper<T> {
public T toPojo(String json);
public String toJson(T pojo);
}
public class WidgetJsonMapper implements JsonMappper<Widget> {
private Gson mapper;
@Override
public Widget toPojo(String json) {
// Use mapper to deserialize JSON into POJO
}
@Override
public String toJson(Widget pojo) {
// Use mapper to serialize a Widget instance into a JSON string.
}
}
当我们谈论Groovy时,我想知道游戏是如何改变的.我看到Grooovy内置了一个JsonSlurper,并想知道是否可以用某种方式代替JSON映射框架(如Gson).
解决方法:
Gson也可以在Groovy中用于将JSON解析为POGO,反之亦然.分别与JsonSlurper和JsonBuilder相同.两种方式的示例:
@Grab( 'com.google.code.gson:gson:2.8.0' )
import com.google.gson.Gson
import com.google.gson.GsonBuilder
import groovy.json.JsonSlurper
import groovy.json.JsonBuilder
class Book {
String name
int isbn
List<Author> authors
}
class Author {
String name
int age
}
def jsonString = '''
{
"name": "Groovy",
"isbn": 12345,
"authors": [{
"name": "John Doe",
"age": 30
}, {
"name": "Bill Nash",
"age": 40
}]
}
'''
//To Test
void assertions( book ) {
book.with {
assert name == 'Groovy'
assert isbn == 12345
assert authors
assert authors[0].name == 'John Doe'
assert authors[0].age == 30
assert authors[1].name == 'Bill Nash'
assert authors[1].age == 40
}
}
/* JSON To POGO*/
//Using JsonSlurper
def book = new Book( new JsonSlurper().parseText( jsonString ) )
assertions book
//Using GSON
Gson gson = new Gson()
def bookUsingGson = gson.fromJson( jsonString, Book )
assertions bookUsingGson
/* POGO To JSON */
//Using JsonBuilder
println new JsonBuilder( book ).toPrettyString()
//Using Gson
println gson.toJson( bookUsingGson )
//Using GsonBuilder for customization
GsonBuilder builder = new GsonBuilder()
// enable pretty print and seriliaze nulls
builder.setPrettyPrinting().serializeNulls()
// customize field title
builder.fieldNamingStrategy = { field -> field.name == "name" ? "title" : field.name }
// use the GsonBuilder to create a gson
Gson gsonBuilder = builder.create()
// pretty print
println gsonBuilder.toJson( bookUsingGson )
原文地址:https://codeday.me/bug/20190722/1506880.html
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