各種json報錯

1. 解析錯--Javabean沒有實現默認的無參數構造器

 

 

Exception in thread "main" com.alibaba.fastjson.JSONException: syntax error, expect {, actual string, pos 22, fieldName activityDetailForm, fastjson-version 1.2.67
at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.deserialze(JavaBeanDeserializer.java:505)
at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.deserialze(JavaBeanDeserializer.java:288)
at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.deserialze(JavaBeanDeserializer.java:284)
at com.alibaba.fastjson.parser.deserializer.DefaultFieldDeserializer.parseField(DefaultFieldDeserializer.java:85)

 

2.在Javabean里寫了get方法，但是沒有對應成員變量和set。直接序列化時報錯：logger.warn("activityWithRuleRecord = {}", JSON.toJSONString(activityWithRuleRecord));

com.alibaba.fastjson.JSONException: write javaBean error, fastjson version 1.2.67, class com.aliexpress.interactive.admin.form.ActivityDetailForm,method : getLotteryPrizePoolItem
at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:539)
at com.alibaba.fastjson.serializer.JavaBeanSerializer.write(JavaBeanSerializer.java:149)
at com.alibaba.fastjson.serializer.JSONSerializer.write(JSONSerializer.java:285)
at com.alibaba.fastjson.JSON.toJSONString(JSON.java:745)
at com.alibaba.fastjson.JSON.toJSONString(JSON.java:683)
at com.alibaba.fastjson.JSON.toJSONString(JSON.java:648)

 

3.Javabean嵌套過深時，解析出來的數據缺失

 

4.指定按照javabean的成員變量序列化（默認使用set/get方法）

 

public static void main(String[] args) {

    Sub sub = new Sub(1,"SUB");

    final boolean fieldBased = true;
    SerializeConfig serializeConfig = new SerializeConfig(fieldBased);
    ParserConfig parserConfig = new ParserConfig(fieldBased);

    Entity first = new Entity(1, "first",sub);
    String str = JSON.toJSONString(first,serializeConfig);
    System.out.println(str);

    Entity entity = JSON.parseObject(str, Entity.class,parserConfig);
    System.out.println(entity);

    /*
    {"code":"code","id":1,"name":"first","sub":{"code":"code","id":1,"name":"SUB"}}
    Entity{id=1, name='first', sub={"code":"code","id":1,"name":"SUB"}}

    {"id":1,"name":"first","sub":{"id":1,"name":"SUB"}}
    null

     */

}