Java 实现 对象和转字符串之间的互转

  <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.7</version>
  </dependency>

  <dependency>
            <groupId>com.squareup.retrofit2</groupId>
            <artifactId>converter-gson</artifactId>
            <version>2.5.0</version>
  </dependency>

public void toJosn() throws Exception {
        ObjectMapper objectMapper = new ObjectMapper(); //json

        // java 对象 -> json 字符串
        // json 字符串 -> java 对象

        News news = new News("kudankuaidaole", "放假通知");
        String s = objectMapper.writeValueAsString(news);

        System.out.println("对象转字符串："+s);
        System.out.println("=============");

        List<News> newsList = Arrays.asList(
                new News("yuandan", "放假"),
                new News("春节", "快来了")
        );

        //第一种方式
        String newslistStr = objectMapper.writeValueAsString(newsList);
        News[] newsArray = objectMapper.readValue(newslistStr, News[].class);
        List<News> newsList1 = objectMapper.readValue(newslistStr, new TypeReference<List<News>>() {
        });

        System.out.println();
        System.out.println("字符串转对象："+newsList1);

        //第二种方式
        List<News> newsList2 = new Gson().fromJson(newslistStr, new TypeToken<List<News>>() {}.getType()); //使用gson
        System.out.println("字符串转对象:"+newsList2);

    }