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JSON–解析器Jackson–json转Java

@Test public void test2() throws IOException { List<User> users = new ArrayList<>(); users.add(new User("张三", 12, new Date())); users.add(new User("李四", 13, new Date())); users.add(new User("王五", 14, new Date())); ObjectMapper mapper = new ObjectMapper(); String s = mapper.writeValueAsString(users); System.out.println(s); //json转java User user = new User(); List<User> user1 = mapper.readValue(s, users.getClass()); System.out.println(user1.get(0)); //mapper.writeValue(new File("F:\\a.txt"),user); }