json串转对象 java json串转list

方法一：采用jaskson的jar包

   

public  static <T> List<T>  getObjectsFromJson(String in, Class<T> clsT) throws IOException {

       JsonParser parser = objectMapper.getJsonFactory().createJsonParser(in);           JsonNode nodes = parser.readValueAsTree();
        List<T> list  = new ArrayList<T>(nodes.size());
        for(JsonNode node : nodes){
            list.add(objectMapper.readValue(node, clsT);
        }
}

其中objectMapper一般是这样定义的：

ObjectMapper objectMapper = new ObjectMapper();

也可以这样

JsonUtils.getObjectMapper();