JSON、JSON字符串和List、Map之间的转换
JSON、JSON字符串和List、Map之间的转换
一、JSON字符串转List<实体类>
List<实体类> pojoList = JSONArray.parseArray(jsonStr,实体类.class);
1、前端传的参数:
String jsonStr1 = "[{"ifCheck":2,"questOptionContentByOne":"答案1","optSort":"A"},{"ifCheck":2,"questOptionContentByOne":"答案1","optSort":"B"}]";
2、后台转换:
String jsonStr1 = "[{\"ifCheck\":2,\"questOptionContentByOne\":\"答案1\",\"optSort\":\"A\"},{\"ifCheck\":2,\"questOptionContentByOne\":\"答案5\",\"optSort\":\"B\"}]";
List<QuestionOptionExam> questionOptionList = JSONArray.parseArray(jsonStr1 ,QuestionOptionExam.class);
二、Json字符串转List<Map<String,Object>>
1、前端参数:
String jsonStr = [{"id":"1","sort":"1"},{"id":"2","sort":"2"}]
2、后台
String jsonStr = "[{\"id\":\"1\",\"sort\":\"1\"},{\"id\":\"2\",\"sort\":\"2\"}]";
List<Map<String,Object>> strList = (List<Map<String, Object>>) JSONArray.parse(jsonStr);
JSON字符串转Map
1、qia
三、Map转实体类
1、后台代码:
public static void main(String[] args){
Map<String,Object> map = new HashMap<>();
map.put("questOptionId","1");
map.put("optSort","2");
map.put("questOptionContentByOne","3");
map.put("ifCheck","4");
QuestionOptionExam questionOptionExam = JSON.parseObject(JSON.toJSONString(map),QuestionOptionExam .class);
System.out.println(questionOptionExam );
}
三、总结测试main方法
public static void main(String[] args){
Map<String,Object> map = new HashMap<>();
map.put("questOptionId","1");
map.put("optSort","2");
map.put("questOptionContentByOne","3");
map.put("ifCheck","4");
QuestionOptionExam questionOptionExam = JSON.parseObject(JSON.toJSONString(map),QuestionOptionExam .class);
System.out.println(questionOptionExam );
String jsonStr = "[{\"id\":\"1\",\"sort\":\"1\"},{\"id\":\"2\",\"sort\":\"2\",\"questOptionId\":\"1\"}]";
List<Map<String,Object>> strList = (List<Map<String, Object>>) JSONArray.parse(jsonStr);
System.out.println(strList);
String jsonStr1 = "[{\"ifCheck\":2,\"questOptionContentByOne\":\"答案1\",\"optSort\":\"A\"},{\"ifCheck\":2,\"questOptionContentByOne\":\"答案5\",\"optSort\":\"B\"}]";
List<QuestionOptionExam> questionOptionList = JSONArray.parseArray(jsonStr1 ,QuestionOptionExam.class);
System.out.println(questionOptionList);
}
四、实体类:
/**
*考试题目选项表实体类
*/
@Data
//@EqualsAndHashCode(callSuper = true)
//@ApiModel(value = "QuestionOprionExam对象", description ="考试题目选项表实体类")
public class QuestionOptionExam {
private static final long serialVersionUID = 1L;
/**
*题目ID
*/
// @ApiModelProperty(value = "题目选项ID")
private Long questOptionId;
/**
*选项序号
*/
// @ApiModelProperty(value = "选项序号")
private String optSort;
/**
*选项内容
*/
// @ApiModelProperty(value = "选项内容")
private String questOptionContentByOne;
/**
*是否选中(1是2否)
*/
// @ApiModelProperty(value = "是否选中(1是2否)")
private Integer ifCheck;
/**
*备注
*/
// @ApiModelProperty(value = "备注")
private String remarks;
}