java - 将大列表转换为json字符串

我有一个包含9864284元素的列表，我想将此列表转换为json字符串，我使用了递归方法，但是我总是有outOfMemory异常。

public String createRecuJson(List<CustomObject> inputList, int nElement, int index, List<String> result, String resJson) throws Exception {
    ObjectMapper objectMapper = new ObjectMapper();
    if( index + nElement > inputList.size() ) {
        resJson = resJson.concat(","+objectMapper.writeValueAsString(inputList.subList(index,inputList.size())).replace("[", "").replace("]", ""));
        result.add(objectMapper.writeValueAsString(inputList.subList(index,inputList.size())));
        return resJson;
    }else {
        final List<CustomObject> subListCustomObjects = inputList.subList(index, index+nElement);
        if(resJson.length() == 0)
            resJson.concat(objectMapper.writeValueAsString(subListCustomObjects).replace("[", "").replace("]", ""));
        else
            resJson = resJson.concat(","+objectMapper.writeValueAsString(subListCustomObjects).replace("[", "").replace("]", ""));
        result.add(objectMapper.writeValueAsString(subListCustomObjects));
        return createRecuJson(inputList, nElement, index+nElement, result, resJson);
    }
}

最佳答案

尝试使用Jackson Streaming API代替您的实现。这是对JSON内容的最低级别的写访问。

Here您可以找到一些示例。