java – 将InputStream解析为Json对象并获取值

2023年5月30日 389次阅读

响应json：

{
    "filename": "vcops-6.0.0-MPforAWS-1.1-1695068.pak",
    "links": [
        {
            "rel": "pak_information",
            "href": "https://<IP>:443/casa/upgrade/cluster/pak/MPforAWS-600/information"
        },
        {
            "rel": "pak_file_information",
            "href": "https://<IP>:443/casa/upgrade/slice/pak/MPforAWS-600/file_information"
        },
        {
            "rel": "pak_cluster_status",
            "href": "https://<IP>:443/casa/upgrade/cluster/pak/MPforAWS-600/status"
        }
    ],
    "pak_id": "MPforAWS-600"
}

我正在使用我们拥有的框架的一个帮助器. Framework将响应返回为“InputStream”.
我想从这个“InputStream”获得“pak_id”.我尝试使用inputStreamObj.toString()这对我不起作用.

我使用的方法是：

private String getPakId(InputStream uploadResponse) {
    String pakId = null;
    try {
        String responseString = readInputStream(uploadResponse);
        JSONObject jObj = new JSONObject(responseString);
        pakId = jObj.getString("pak_id").trim();
        Reporter.log("Pak id is=" + pakId, true);
    } catch (Exception e) {
        Reporter.log("Error in getting pak_id " + e.getMessage(), true);
    }
    return pakId;
}

和

private String readInputStream(InputStream inputStream) throws IOException {
    BufferedReader reader = new BufferedReader(new InputStreamReader(
            inputStream, "UTF-8"));
    String tmp;
    StringBuilder sb = new StringBuilder();
    while ((tmp = reader.readLine()) != null) {
        sb.append(tmp).append("\n");
    }
    if (sb.length() > 0 && sb.charAt(sb.length() - 1) == '\n') {
        sb.setLength(sb.length() - 1);
    }
    reader.close();
    return sb.toString();
}

最佳答案 如果您查看
InputStream的文档,您会发现它不会向您保证toString将向您显示流的内容.

如果你对实际流式传输不感兴趣(如果你希望响应很小,这是合理的,就像这里的情况一样),可以先从流中获取所有字节,然后将它们放入String,然后解析String.

为了从InputStream中获取String,我建议从apache commons-io开始使用IOUtils.toString.

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