java - 如何在java中捕获JSON文件中的字符串？

Question

我有一个 JSON 文件，需要获取参数“全文”，但我是 JSON 新手，不知道如何在 Java 中检索它。有人可以向我解释一下如何捕获这个值全文吗？

这里是 JSON 文件的一部分。

{
  "head": {
    "vars": [ "author" , "title" , "paper" , "fulltext" ]
  } ,
  "results": {
    "bindings": [
      {
        "author": { "type": "uri" , "value": "http://data.linkededucation.org/resource/lak/person/richard-scheines" } ,
        "title": { "type": "literal" , "value": "Discovering Prerequisite Relationships among Knowledge Components" } ,
        "paper": { "type": "uri" , "value": "http://data.linkededucation.org/resource/lak/conference/edm2014/paper/492" } ,
        "fulltext": { "type": "literal" , "value": "GET TEXT" }
      } ,

Answer 1

从这里下载 Json 库 jar 下载表单 here

在JSonParsing.java中添加此代码

   import org.json.*;
    public class JSonParsing {
        public static void main(String[] args){
            String source = "{\n" +
    "  \"head\": {\n" +
    "    \"vars\": [ \"author\" , \"title\" , \"paper\" , \"fulltext\" ]\n" +
    "  } ,\n" +
    "  \"results\": {\n" +
    "    \"bindings\": [\n" +
    "      {\n" +
    "        \"author\": { \"type\": \"uri\" , \"value\": \"http://data.linkededucation.org/resource/lak/person/richard-scheines\" } ,\n" +
    "        \"title\": { \"type\": \"literal\" , \"value\": \"Discovering Prerequisite Relationships among Knowledge Components\" } ,\n" +
    "        \"paper\": { \"type\": \"uri\" , \"value\": \"http://data.linkededucation.org/resource/lak/conference/edm2014/paper/492\" } ,\n" +
    "        \"fulltext\": { \"type\": \"literal\" , \"value\": \"GET TEXT\" }\n" +
    "      }\n" +
    "    ]\n" +
    "  }\n" +
    "}\n" +
    "";
            JSONObject main = new JSONObject(source);
            JSONObject results = main.getJSONObject("results");
            JSONArray bindings = results.getJSONArray("bindings");
            JSONObject firstObject = bindings.getJSONObject(0);
            JSONObject fulltextOfFirstObject = firstObject.getJSONObject("fulltext");
            String type = fulltextOfFirstObject.getString("type");
            String value = fulltextOfFirstObject.getString("value");
            System.out.println("Type :"+ type+"\nValue :"+value);
        }
    }

注意:在 JSON 中，{} 表示 jsonObject，[] 表示 jsonArray。