1、在html页面中json的转换
<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>Title</title>
</head>
<body>
<script type="text/javascript">var a={"id":1,"name":"张三","age":18}//将json转化成json格式的字符串var s = JSON.stringify(a);console.log("json格式的字符串=",s);//将json格式的字符串转化成jsonvar parse = JSON.parse(s);console.log("json=",parse)
</script>
</body>
</html>2、在java中json的转换
需要引入这个jar包
public class User {private String id;private String username;public User(String id, String username) {this.id = id;this.username = username;}@Overridepublic String toString() {return "User{" +"id='" + id + '\'' +", username='" + username + '\'' +'}';}
}
public class Test {public static void main(String[] args) {//将对象转换成json格式的字符串User user = new User("1", "张三");Gson gson = new Gson();String s = gson.toJson(user);System.out.println("将对象转换成json格式的字符串\t\t"+s);//将json格式的字符串转对象，底层是通过反射来完成的User user1 = gson.fromJson(s, User.class);System.out.println(user1);//将List集合转换成json格式的字符串ArrayList<User> list = new ArrayList<>();list.add(new User("1","张三"));list.add(new User("2","李四"));list.add(new User("3","王五"));String s1 = gson.toJson(list);System.out.println(s1);//将list类型的json格式的字符串转成对象Type type = new TypeToken<ArrayList<User>>() {}.getType();Object o = gson.fromJson(s1, type);System.out.println(o);//将map集合转成json格式的字符串HashMap<String, String> hashMap = new HashMap<>();hashMap.put("a","张三");hashMap.put("b","李四");hashMap.put("c","王五");String s2 = gson.toJson(hashMap);System.out.println(s2);//将map类型的json格式的字符串转成对象Type type1 = new TypeToken<HashMap<String, String>>() {}.getType();Object o1 = gson.fromJson(s2, type1);System.out.println(o1);}
}
