com.fasterxml.jackson.core jackson-databind2.14.0
2 把对象转换为json字符串ObjectMapper objectMapper = new ObjectMapper();
People peo = new People();
objectMapper.writeValueAsString(peo);
3 把json字符串转换为对象ObjectMapper objectMapper = new ObjectMapper();
People peo = objectMapper.readValue(content, People.class);
4 把json字符串转换为List集合ObjectMapper objectMapper = new ObjectMapper();
JavaType javaType = objectMapper.getTypeFactory().constructParametricType(List.class, People.class);
Listlist = objectMapper.readValue(content, javaType);
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