我們先來看一個(gè)例子:
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package com.elong.bms; import java.io.OutputStream; import java.util.HashMap; import java.util.Map; import com.alibaba.fastjson.JSON; public class Test { public static void main(String[] args) { Map<String, Student> maps = new HashMap<String, Student>(); Student s1 = new Student( "s1" , 16 ); maps.put( "s1" , s1); maps.put( "s2" , s1); byte [] bytes = JSON.toJSONBytes(maps); System.out.println( new String(bytes)); } } |
輸出:
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{ "s1" :{ "age" :16, "name" : "s1" }, "s2" :{ "$ref" : "$.s1" }} |
可以看到,這個(gè)json如果發(fā)到前端是無法使用的,幸好FastJson提供了解決辦法,我們來看下,解決辦法為禁用循環(huán)引用檢測,代碼如下:
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package com.elong.bms; import java.io.OutputStream; import java.util.HashMap; import java.util.Map; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.serializer.SerializerFeature; public class Test { public static void main(String[] args) { Map<String, Student> maps = new HashMap<String, Student>(); Student s1 = new Student( "s1" , 16 ); maps.put( "s1" , s1); maps.put( "s2" , s1); SerializerFeature feature = SerializerFeature.DisableCircularReferenceDetect; byte [] bytes = JSON.toJSONBytes(maps,feature); System.out.println( new String(bytes)); } } |
輸出如下:
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{ "s1" :{ "age" :16, "name" : "s1" }, "s2" :{ "age" :16, "name" : "s1" }} |
問題是如果我們在spring mvc中使用的時(shí)候,需要將SerializerFeature注入到MessageConverter里面, FastJsonHttpMessageConverter
但是SerializerFeature是一個(gè)enum類型的,又是一個(gè)array,考慮到大部分人對這個(gè)不熟悉,直接上代碼了。
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< bean id = "jsonConverter" class = "com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter" > < property name = "supportedMediaTypes" value = "application/json;charset=UTF-8" /> < property name = "features" > < array value-type = "com.alibaba.fastjson.serializer.SerializerFeature" > < value >DisableCircularReferenceDetect</ value > </ array > </ property > </ bean > < bean id = "DisableCircularReferenceDetect" class = "org.springframework.beans.factory.config.FieldRetrievingFactoryBean" > < property name = "staticField" value = "com.alibaba.fastjson.serializer.SerializerFeature.DisableCircularReferenceDetect" ></ property > </ bean > |
以上就是本文的全部內(nèi)容,希望對大家的學(xué)習(xí)有所幫助,也希望大家多多支持服務(wù)器之家。
原文鏈接:http://asialee.iteye.com/blog/2101915