jackson json字符串转对象,支持泛型

#先上代码

1/**
2 * 解析泛型类型
3 * @param type
4 * @return
5 */
6public static List<Class<?>> parseGenericType(Type type){
7    List<Class<?>> rootList = new ArrayList<Class<?>>();
8    if(type instanceof ParameterizedType){
9        ParameterizedType pType = (ParameterizedType)type;
10        rootList.add((Class<?>)pType.getRawType());
11        for(Type at : pType.getActualTypeArguments()){
12            List<Class<?>> childList = parseGenericType(at);
13            rootList.addAll(childList);
14        }
15    }else{
16        rootList.add((Class<?>)type);
17    }
18    return rootList;
19}
20
21public static JavaType parseJavaType(ObjectMapper jsonMapper, Type genericParameterType){
22    List<Class<?>> list =  parseGenericType(genericParameterType);
23    if(list==null || list.size()==1){
24        return jsonMapper.getTypeFactory().constructType(genericParameterType);
25    }
26    Class<?>[] classes = list.toArray(new Class[list.size()]);
27    Class<?>[] paramClasses = new Class[classes.length-1];
28    System.arraycopy(classes,1,paramClasses,0,paramClasses.length);
29    JavaType javaType = jsonMapper.getTypeFactory().constructParametrizedType(classes[0],classes[0],paramClasses);
30    return javaType;
31}

#使用例子

1JavaType javaType = parseJavaType(objectMapper,method.getGenericReturnType());
2MyBean bean = objectMapper.readValue(jsonStr, javaType);

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