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：
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@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：
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@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
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{ "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
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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:
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
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。
原文链接：https://blog.csdn.net/weixin_40910372/article/details/100669444
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