jackson 与复杂对象的json转换

jackson-mapper-asl.1.9.4.jar

ObjectMapper mapper =new ObjectMapper();

对象转换为json串

public static String Object2Json(Object o) throws BusinessException {
    StringWriter writer = new StringWriter();

    try {
        mapper.writeValue(writer, o);
    } catch (IOException var3) {
        var3.printStackTrace();
        throw new BusinessException("Entity转换成Json时出现异常。", var3);
    }

    return writer.toString();
}

json转换为bean

entity = (Entity)mapper.readValue(json, clazz);

与List<T>转换

public static <T extends BaseEntity> List<T> json2List(String json, Class<T> clazz) throws BusinessException {
    ObjectMapper mapper = new ObjectMapper();
    JavaType javaType = mapper.getTypeFactory().constructParametricType(ArrayList.class, new Class[]{clazz});

    try {
        return (List)mapper.readValue(json, javaType);
    } catch (JsonParseException var5) {
        var5.printStackTrace();
        throw new BusinessException("Json转换成List<T>异常。", var5);
    } catch (JsonMappingException var6) {
        var6.printStackTrace();
        throw new BusinessException("Json转换成List<T>异常。", var6);
    } catch (IOException var7) {
        var7.printStackTrace();
        throw new BusinessException("Json转换成List<T>异常。", var7);
    }
}

复杂对象转换：Result<List< ReasonDepartmentDto>>

JavaType tType = mapper.getTypeFactory().constructParametricType(ArrayList.class,ReasonDepartmentDto.class);
JavaType javaType = mapper.getTypeFactory().constructParametricType(Result.class, tType);
result =(Result<List<ReasonDepartmentDto>>) mapper.readValue(dataMap.get("value"), javaType);