解决Jackson解析嵌套类问题(MismatchedInputException)
目录
- Jackson解析嵌套类(MismatchedInputException)
- 具体报错如下
- Jackson处理嵌套Json数据
- 数据 ------》打印每条数据
- 代码
- 输出结果
Jackson解析嵌套类(MismatchedInputException)
具体报错如下
问题描述:Jackson解析嵌套类问题
调用接口返回json格式的数据,使用Jackson解析参数转换成对象:
@Data @JsonIgnoreProperties(ignoreUnknown = true) public class PixlIdDto implements Serializable { @JsonIgnore private static final long serialVersionUID = -5776690969534186379L; @JsonProperty("models") private List<Models> models; @Data @JsonIgnoreProperties(ignoreUnknown = true) public class Models implements Serializable { @JsonIgnore private static final long serialVersionUID = 9189184337502771734L; @JsonProperty("medias") private List<Medias> medias; @JsonProperty("code") private String code; @Data @JsonIgnoreProperties(ignoreUnknown = true) public class Medias implements Serializable { @JsonIgnore private static final long serialVersionUID = 136346277159168673L; @JsonProperty("mediaZones") private List<MediaZones> mediaZones; @Data @JsonIgnoreProperties(ignoreUnknown = true) public class MediaZones implements Serializable { @JsonIgnore private static final long serialVersionUID = 7683892920280290206L; @JsonProperty("medias") private List<MediasInner> medias; @JsonProperty("name") private String name; @Data @JsonIgnoreProperties(ignoreUnknown = true) public class MediasInner implements Serializable { @JsonIgnore private static final long serialVersionUID = 8653771742539974404L; @JsonProperty("displayOrder") private int displayOrder ; @JsonProperty("pixlId") private String pixlId; } } } } }
问题本质为:内部非静态类无法实例化
你需要做两件事:
- 给内部类前面加上static
- 给内部类加上默认构造函数
改过后的内部类像这样:
@Data @JsonIgnoreProperties(ignoreUnknown = true) public class PixlIdDto implements Serializable { @JsonIgnore private static final long serialVersionUID = -5776690969534186379L; @JsonProperty("models") private List<Models> models; @Data @JsonIgnoreProperties(ignoreUnknown = true) @NoArgsConstructor public static class Models implements Serializable { @JsonIgnore private static final long serialVersionUID = 9189184337502771734L; @JsonProperty("medias") private List<Medias> medias; @JsonProperty("code") private String code; @Data @JsonIgnoreProperties(ignoreUnknown = true) @NoArgsConstructor public static class Medias implements Serializable { @JsonIgnore private static final long serialVersionUID = 136346277159168673L; @JsonProperty("mediaZones") private List<MediaZones> mediaZones; @Data @JsonIgnoreProperties(ignoreUnknown = true) @NoArgsConstructor public static class MediaZones implements Serializable { @JsonIgnore private static final long serialVersionUID = 7683892920280290206L; @JsonProperty("medias") private List<MediasInner> medias; @JsonProperty("name") private String name; @Data @JsonIgnoreProperties(ignoreUnknown = true) @NoArgsConstructor public static class MediasInner implements Serializable { @JsonIgnore private static final long serialVersionUID = 8653771742539974404L; @JsonProperty("displayOrder") private int displayOrder; @JsonProperty("pixlId") private String pixlId; } } } } }
问题完美解决。
Jackson处理嵌套Json数据
数据 ------》打印每条数据
{ "ID": 10001, "detail": "detail", "json_format_version": 1.0, "other_info": { "array_one": [ [855, 410], [854, 411], [847, 411], [846, 410], [845, 410], [844, 409] ], "array_two": [ [832, 303], [829, 303], [828, 302], [825, 302], [824, 301] ], "array_three": [ [1013, 224], [1012, 225], [1010, 225], [1009, 226], [1023, 224] ], "point": [853, 310], "boolean": true } }
代码
public class Test { public static void main(String[] args) throws IOException { // File file = new File("src/main/resources/doc/windABC.json"); // FileInputStream fip = new FileInputStream(file); BufferedReader br = new BufferedReader(new FileReader("src/main/resources/doc/resource.json")); ObjectMapper mapper = new ObjectMapper(); //读取json的节点 JsonNode node = mapper.readTree(br); //获取所有的key Iterator<String> keys = node.fieldNames(); BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter("src/main/resources/doc/result.txt")); bufferedWriter.write("项目:**********\t\t"); bufferedWriter.write("部门:**********\t\t"); bufferedWriter.write("工号:**********\n"); while (keys.hasNext()) { String key = keys.next(); bufferedWriter.write(key + ":"); bufferedWriter.newLine(); if (key.equals("other_info")) { JsonNode other_infoNode = mapper.readTree(node.get(key).toString()); Iterator<String> other_info_Key = other_infoNode.fieldNames(); for (JsonNode jsonNode : other_infoNode) { bufferedWriter.write(other_info_Key.next().toString() + ":\n"); isArrayNode(jsonNode,mapper,bufferedWriter); } } else { bufferedWriter.write(node.get(key).asText()); bufferedWriter.newLine(); } bufferedWriter.newLine(); } bufferedWriter.close(); br.close(); } public static void isArrayNode(JsonNode jsonNode,ObjectMapper mapper,BufferedWriter bufferedWriter) throws IOException { if (jsonNode.isArray()) { for (JsonNode node1 : jsonNode) { isArrayNode(node1,mapper,bufferedWriter);//递归调用,判断是否数组嵌套数组 } bufferedWriter.newLine(); }else { bufferedWriter.write(jsonNode.asText()); bufferedWriter.newLine(); } } }
输出结果
项目:******** 部门:******** 工号:********
ID:
10001detail:
detailjson_format_version:
1.0other_info:
array_one:
855
410854
411847
411846
410845
410844
409array_two:
832
303829
303828
302825
302824
301array_three:
1013
2241012
2251010
2251009
2261023
224point:
853
310boolean:
true
以上为个人经验,希望能给大家一个参考,也希望大家多多支持我们。
赞 (0)