Fastjson反序列化随机性失败示例详解

package test;
import java.util.List;
public class StewardTipItem {
    private Integer type;
    private List<String> contents;
    public StewardTipItem(Integer type, List<String> contents) {
        this.type = type;
        this.contents = contents;
    }
}

package test;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class StewardTipCategory {
    private String category;
    private List<StewardTipItem> items;
    public StewardTipCategory build() {
        return null;
    }
    //C1 下文使用C1引用该构造函数
    public StewardTipCategory(String category, Map<Integer,List<String>> items) {          
        List<StewardTipItem> categoryItems = new ArrayList<>();
    for (Map.Entry<Integer, List<String>> item : items.entrySet()) { 
        StewardTipItem tipItem = new StewardTipItem(item.getKey(), item.getValue());                   categoryItems.add(tipItem);
    }
    this.items = categoryItems;
    this.category = category; 
}
    // C2 下文使用C2引用该构造函数
    public StewardTipCategory(String category, List<StewardTipItem> items) {        
        this.category = category;
        this.items = items;
    }
    public String getCategory() {
        return category;
    }
    public void setCategory(String category) {
        this.category = category;
    }
    public List<StewardTipItem> getItems() {
        return items; 
    }
    public void setItems(List<StewardTipItem> items) {
        this.items = items; 
    }
}

package test;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class StewardTip {
    private List<StewardTipCategory> categories;
    public StewardTip(Map<String, Map<Integer, List<String>>> categories) {          
        List<StewardTipCategory> tipCategories = new ArrayList<>();
        for (Map.Entry<String, Map<Integer, List<String>>> category : categories.entrySet()) {             StewardTipCategory tipCategory = new StewardTipCategory(category.getKey(), category.getValue());
            tipCategories.add(tipCategory);
        }
        this.categories = tipCategories; 
    }
    public StewardTip(List<StewardTipCategory> categories) {
        this.categories = categories;
    }
    public List<StewardTipCategory> getCategories() { 
        return categories;
    }
    public void setCategories(List<StewardTipCategory> categories) {
        this.categories = categories;
    }
}

{
    "categories":[
        {
             "category":"工艺类",
             "items":[
                 {
                     "contents":[
                         "工艺类-提醒项-内容1", 
                         "工艺类-提醒项-内容2"
                     ],
                     "type":1
                }, 
                { 
                     "contents":[ 
                         "工艺类-疑问项-内容1" 
                     ], 
                     "type":2
                }
            ]
        }
    ]
}

package test;
import com.alibaba.fastjson.JSONObject;
public class FastJSONTest {
    public static void main(String[] args) {
        String tip = "{"categories":[{"category":"工艺类","items":[{"contents":["工艺类-提醒项-内容1","工艺类-提醒项-内容2"],"type":1},{"contents":["工艺类-疑问项-内容1"],"type":2}]}]}";        
        try {
            JSONObject.parseObject(tip, StewardTip.class); 
        } catch (Exception e) {
            e.printStackTrace(); 
        }
    }
}

com.alibaba.fastjson.JSONException: syntax error, expect {, actual [
    at com.alibaba.fastjson.parser.deserializer.MapDeserializer.parseMap(MapDeserializer.java:228)
    at com.alibaba.fastjson.parser.deserializer.MapDeserializer.deserialze(MapDeserializer.java:67)  
    at com.alibaba.fastjson.parser.deserializer.MapDeserializer.deserialze(MapDeserializer.java:43)  
    at com.alibaba.fastjson.parser.deserializer.DefaultFieldDeserializer.parseField(DefaultFieldDeserializer.java:85)
    at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.deserialze(JavaBeanDeserializer.java:838)
    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.ArrayListTypeFieldDeserializer.parseArray(ArrayListTypeFieldDeserializer.java:181)
    at com.alibaba.fastjson.parser.deserializer.ArrayListTypeFieldDeserializer.parseField(ArrayListTypeFieldDeserializer.java:69) 
    at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.deserialze(JavaBeanDeserializer.java:838)
    at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.deserialze(JavaBeanDeserializer.java:288)
    at com.alibaba.fastjson.parser.DefaultJSONParser.parseObject(DefaultJSONParser.java:672)  at com.alibaba.fastjson.JSON.parseObject(JSON.java:396) 
    at com.alibaba.fastjson.JSON.parseObject(JSON.java:300)
    at com.alibaba.fastjson.JSON.parseObject(JSON.java:573)
    at test.FastJSONTest.main(FastJSONTest.java:17)

package test;
import com.alibaba.fastjson.JSONObject;
import java.lang.reflect.Constructor;
public class FastJSONTest {
    public static void main(String[] args) { 
        Constructor<?>[] declaredConstructors = StewardTipCategory.class.getDeclaredConstructors(); 
        // if true must fail！
       if ("public test.StewardTipCategory(java.lang.String,java.util.Map<java.lang.Integer, java.util.List<java.lang.String>>)".equals(declaredConstructors[0].toGenericString())) {                 
           String tip = "{"categories":[{"category":"工艺类","items":[{"contents":["工艺类-提醒项-内容1","工艺类-提醒项-内容2"],"type":1},{"contents":["工艺类-疑问项-内容1"],"type":2}]}]}";                   
           try { 
                JSONObject.parseObject(tip, StewardTip.class);
            } catch (Exception e) {  
                e.printStackTrace();
            }
        }
    }
}