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java json轉(zhuǎn)list map

在Java的開發(fā)過程中,經(jīng)常會(huì)遇到將JSON數(shù)據(jù)轉(zhuǎn)換為List或Map的場(chǎng)景。這時(shí)候便需要使用JSON轉(zhuǎn)換工具來完成轉(zhuǎn)換。本文將介紹如何使用Java中的JSON轉(zhuǎn)換工具將JSON數(shù)據(jù)轉(zhuǎn)換為List和Map。

首先,需要選擇一個(gè)JSON轉(zhuǎn)換工具。目前Java中比較流行和常用的JSON轉(zhuǎn)換工具有以下幾種:

1. Gson
2. Fastjson
3. Jackson

在本文中,我們將使用Gson來演示JSON數(shù)據(jù)轉(zhuǎn)換為List和Map的過程。Gson是一個(gè)由Google開發(fā)的用來解析JSON數(shù)據(jù)的Java庫,不僅使用簡單,而且性能也比較好。

示例JSON數(shù)據(jù)如下:

{
"name": "John",
"age": 30,
"address": {
"city": "New York",
"country": "USA"
},
"hobbies": ["reading", "swimming", "traveling"]
}

將JSON數(shù)據(jù)轉(zhuǎn)換為List的代碼如下:

String json = "{\n" +
"    \"name\": \"John\",\n" +
"    \"age\": 30,\n" +
"    \"address\": {\n" +
"        \"city\": \"New York\",\n" +
"        \"country\": \"USA\"\n" +
"    },\n" +
"    \"hobbies\": [\"reading\", \"swimming\", \"traveling\"]\n" +
"}";
Gson gson = new Gson();
Type listType = new TypeToken<List<String>>(){}.getType();
List<String> hobbies = gson.fromJson(json, listType);
System.out.println(hobbies);

將JSON數(shù)據(jù)轉(zhuǎn)換為Map的代碼如下:

String json = "{\n" +
"    \"name\": \"John\",\n" +
"    \"age\": 30,\n" +
"    \"address\": {\n" +
"        \"city\": \"New York\",\n" +
"        \"country\": \"USA\"\n" +
"    },\n" +
"    \"hobbies\": [\"reading\", \"swimming\", \"traveling\"]\n" +
"}";
Gson gson = new Gson();
Type mapType = new TypeToken<Map<String, Object>>(){}.getType();
Map<String, Object> jsonMap = gson.fromJson(json, mapType);
System.out.println(jsonMap);

通過上述代碼的演示,我們可以看到,使用Gson工具將JSON數(shù)據(jù)轉(zhuǎn)換為List和Map并不難,只需要按照對(duì)應(yīng)的類型傳入JSON數(shù)據(jù)和轉(zhuǎn)換后的類型即可。