使用jackson进行字符串,集合和json之间的转换

转自https://blog.csdn.net/strophe/article/details/78781951

jar包:jackson-databind-2.9.8.jar  jackson-core-2.9.8.jar

import com.fasterxml.jackson.core.JsonProcessingException;

import com.fasterxml.jackson.databind.ObjectMapper;

所用的Bean对象FileVo

public class FileVo {private String fileName;private String fileUrl;}

 

1.Bean to json

ObjectMapper objectMapper = new ObjectMapper();String fileJson = objectMapper.writeValueAsString(new FileVo("百度","www.baidu.com"));System.out.println(fileJson );

 输出结果:{"fileName":"百度","fileUrl":"www.baidu.com"}

2.List to json

ObjectMapper objectMapper = new ObjectMapper();List<FileVo> list = new ArrayList<FileVo>();list.add(new FileVo("百度","www.baidu.com"));list.add(new FileVo("新浪","www.sina.com"));String fileJson = objectMapper.writeValueAsString(list);System.out.println(fileJson );

 输出结果:[{"fileName":"百度","fileUrl":"www.baidu.com"},{"fileName":"新浪","fileUrl":"www.sina.com"}]

3.Json to Bean

ObjectMapper om = new ObjectMapper();String fileJson = "{"fileName":"百度","fileUrl":"www.baidu.com"}";FileVo fileVo = om.readValue(fileJson, FileVo.class);

4.Json to List

ObjectMapper om = new ObjectMapper();String fileJson = "{"fileName":"百度","fileUrl":"www.baidu.com"},{"fileName":"新浪","fileUrl":"www.sina.com"}"JavaType javaType = om.getTypeFactory().constructParametricType(List.class, FileVo.class);listFileVo = (List<FileVo>)om.readValue(fileJson, javaType);