一、Maven專案，pom.xml檔案中匯入

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.75</version>
        </dependency>

二、JSONPath使用時，注意絕對路徑和相對路徑，例項如下

{ "store": {
    "book": [ 
      { "category": "reference",
        "author": "Nigel Rees",
        "title": "Sayings of the Century",
        "price": 8.95
      },
      { "category": "fiction",
        "author": "Evelyn Waugh",
        "title": "Sword of Honour",
        "price": 12.99,
        "isbn": "0-553-21311-3"
      }
    ],
    "bicycle": {
      "color": "red",
      "price": 19.95
    }
  }
}
 

上面一段json資料，獲取價格欄位的值

String jsonStr = "...."

絕對路徑

List<Double> prices = (List<Double>) JSONPath.read(jsonStr, "$.store.book.price");

相對路徑

List<String> names = (List<String>) JSONPath.read(jsonStr, "..price");

三、JSON轉map

String json="{\"msg\":\"登入成功\",\"uid\":\"9CC972DFA2D4481F89841A46FD1B3E7B\",\"code\":\"1\"}";

Map map = JSON.parseObject(json,Map.class);
System.out.println("map==="+map.get("uid"));