使用Java读取JSON数据 [英] Reading JSON data using Java

问题描述

我有500,000行json文件正在尝试读取，我尝试了一些在线示例，例如mkyong和许多其他示例，但是这种格式对我来说是第一次遇到.谁能帮助我入门?

I have a 500,000 line json file I'm trying to read, I tried out a few online examples like mkyong's and many others, but this format is a first encounter for me. Can anyone help me to get started?

我正在使用json简单库.

I'm using json-simple library.

有人启发这个话题吗?我会很感激

Any enlighten on this topic? I'll be very grateful

 {
"info": {
    "category": "url", 
    "started": "2013-11-07 03:44:32", 
    "ended": "2013-11-07 03:46:55", 
    "version": "0.6", 
    "duration": 143, 
    "id": 37
}, 
"signatures": [], 
"static": {}, 
"dropped": [
    {
        "yara": [], 
        "sha1": "6fd9eb6a42fd531988fba24137a2fe29ad992465", 
        "name": "tia[1].png", 
        "type": "PNG image data, 27 x 23, 8-bit/color RGB, non-interlaced", 
        "sha256": "75d6d26afb9506145d7f6472555855ef4305e0ef3e7cf4cb3d943c58123c7f74", 
        "crc32": "FDCAC92F", 
        "path": "/home/user/cuckoo/storage/analyses/37/files/2435944344/tia[1].png", 
        "ssdeep": null, 
        "size": 387, 
        "sha512": "b47ca17050ff4b6ddab848195c17b875454aafbec06d07bba126e553c9d32647f461adee9d1a75bbfffa08d6a8fc955429562794b123bebc9ec23dc89bdefcc5", 
        "md5": "ad07ee4cb98da073dda56ce7ceb88f5a"
    }
 ]
}

回复

我目前不了解如何在[dropped]中获取数组，我做了一些简单的示例，但这对我来说是头一个.似乎有一个层次结构，但我不知道如何访问它

推荐答案

为什么不以 json-simple解码示例?如果是您担心的文件大小，则应使用"SAX"样式示例.这段代码将是一个很好的例子，说明如何不这样做.请参阅其他评论以获取更好的主意.

Why not start with the json-simple decoding examples? If it's the size of the file you're worried about, then you should use the 'SAX' style example. This code would be a good example of how not to do it. See the other comment for better ideas.

JSONObject data= (JSONObject)JSONValue.parse(new InputStreamReader(JsonSimpleEx.class.getResourceAsStream("/test.json")) );
JSONArray dropped = (JSONArray)data.get("dropped");
JSONObject first = (JSONObject)dropped.get(0);
System.out.println( first.get("crc32"));

这篇关于使用Java读取JSON数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！