springmvc中解决FastJson循环引用的问题

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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));  }}
输出
{"s1":{"age":16,"name":"s1"},"s2":{"$ref":"$.s1"}}
可以看到，这个json如果发到前端是无法使用的，幸好FastJson提供了解决办法，我们来看下，解决办法为禁用循环引用检测，代码如下：
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));  }}
{"s1":{"age":16,"name":"s1"},"s2":{"age":16,"name":"s1"}}

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