json数组:
[
{
"address": "中国",
"age": 30,
"name": "小明",
"sex": "boy"
},
{
"address": "加拿大",
"age": 20,
"name": "小雨",
"sex": "girl"
}
]
解析代码如下:
创建对应实体类:
public class Bean {
public String name;
public int age;
public String sex;
public String address;
}
解析代码:
String strJson = "[\n" +
" {\n" +
" \"address\": \"中国\",\n" +
" \"age\": 30,\n" +
" \"name\": \"小明\",\n" +
" \"sex\": \"boy\"\n" +
" },\n" +
" {\n" +
" \"address\": \"加拿大\",\n" +
" \"age\": 20,\n" +
" \"name\": \"小雨\",\n" +
" \"sex\": \"girl\"\n" +
" }\n" +
"]";
Gson gson = new Gson();//创建Gson对象
JsonParser jsonParser = new JsonParser();
JsonArray jsonElements = jsonParser.parse(strJson).getAsJsonArray();//获取JsonArray对象
ArrayList<Bean> beans = new ArrayList<>();
for (JsonElement bean : jsonElements) {
Bean bean1 = gson.fromJson(bean, Bean.class);//解析
beans.add(bean1);
}
System.out.println(beans.size());
System.out.println(beans.get(1).name);
反过来,如何将对象生成json了,代码如下:
Map<String, Object> map = new HashMap<>();
map.put("name", "小明");
map.put("age", 30);
map.put("address", "中国");
map.put("sex", "boy");
List<Map<String, Object>> list = new ArrayList<>();
list.add(map);
String s = new Gson().toJson(list);//生成jsonString
System.out.println(s);