java - Json 到 Java 对象的转换

问题描述

我正在尝试使用 Java 中的 jackson 解析以下对象。

[
  [null, {
    "distance": 2272,
    "duration": 580
  }, {
    "distance": 7217,
    "duration": 1393
  }, {
    "distance": 5773,
    "duration": 1061
  }, {
    "distance": 6208,
    "duration": 1170
  }, {
    "distance": 18846,
    "duration": 2686
  }],
  [{
    "distance": 2262,
    "duration": 558
  }, null, {
    "distance": 7144,
    "duration": 1366
  }, {
    "distance": 4803,
    "duration": 801
  }, {
    "distance": 5238,
    "duration": 910
  }, {
    "distance": 17876,
    "duration": 2426
  }],
  [{
    "distance": 7207,
    "duration": 1393
  }, {
    "distance": 7505,
    "duration": 1411
  }, null, {
    "distance": 12375,
    "duration": 2010
  }, {
    "distance": 12809,
    "duration": 2119
  }, {
    "distance": 24868,
    "duration": 3462
  }],
  [{
    "distance": 7481,
    "duration": 1255
  }, {
    "distance": 4643,
    "duration": 831
  }, {
    "distance": 11497,
    "duration": 2060
  }, null, {
    "distance": 434,
    "duration": 109
  }, {
    "distance": 13197,
    "duration": 1657
  }],
  [{
    "distance": 7723,
    "duration": 1326
  }, {
    "distance": 4884,
    "duration": 902
  }, {
    "distance": 11739,
    "duration": 2130
  }, {
    "distance": 434,
    "duration": 107
  }, null, {
    "distance": 12999,
    "duration": 1628
  }],
  [{
    "distance": 20372,
    "duration": 2918
  }, {
    "distance": 17534,
    "duration": 2493
  }, {
    "distance": 25912,
    "duration": 3432
  }, {
    "distance": 13669,
    "duration": 1774
  }, {
    "distance": 13414,
    "duration": 1779
  }, null]
]

我是否收到以下错误。

线程“主”java.lang.IllegalArgumentException 中的异常：无法构造实例com.beeline.DistanceMatrix"duration":1774},{"distance":13414,"duration":1779},null]]') 在 [来源：未知；行：-1，列：-1] 在 com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:3750) 在 com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:3668) 在 com .beeline.JsonParser.(JsonParser.java:17)

我正在使用的课程是

JsonParser.java

public class JsonParser {
    private DistanceMatrix matrix = new DistanceMatrix();
    public JsonParser() {
        String jsonString = "[[null,{\"distance\":2272,\"duration\":580},{\"distance\":7217,\"duration\":1393},{\"distance\":5773,\"duration\":1061},{\"distance\":6208,\"duration\":1170},{\"distance\":18846,\"duration\":2686}],[{\"distance\":2262,\"duration\":558},null,{\"distance\":7144,\"duration\":1366},{\"distance\":4803,\"duration\":801},{\"distance\":5238,\"duration\":910},{\"distance\":17876,\"duration\":2426}],[{\"distance\":7207,\"duration\":1393},{\"distance\":7505,\"duration\":1411},null,{\"distance\":12375,\"duration\":2010},{\"distance\":12809,\"duration\":2119},{\"distance\":24868,\"duration\":3462}],[{\"distance\":7481,\"duration\":1255},{\"distance\":4643,\"duration\":831},{\"distance\":11497,\"duration\":2060},null,{\"distance\":434,\"duration\":109},{\"distance\":13197,\"duration\":1657}],[{\"distance\":7723,\"duration\":1326},{\"distance\":4884,\"duration\":902},{\"distance\":11739,\"duration\":2130},{\"distance\":434,\"duration\":107},null,{\"distance\":12999,\"duration\":1628}],[{\"distance\":20372,\"duration\":2918},{\"distance\":17534,\"duration\":2493},{\"distance\":25912,\"duration\":3432},{\"distance\":13669,\"duration\":1774},{\"distance\":13414,\"duration\":1779},null]]";
        ObjectMapper oMapper = new ObjectMapper();
        oMapper.enable(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT);
        oMapper.enable(DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT);
        matrix = oMapper.convertValue(jsonString, DistanceMatrix.class);
        System.out.print(matrix);
    }
}

距离矩阵.java

public class DistanceMatrix {
    public ArrayList<ArrayList<Map<String, Float>>> matrix = new ArrayList<ArrayList<Map<String, Float>>>();
}

我在 GitHub 和 SO 上看到了多个类似的问题。但我不知道为什么它不起作用。关于出了什么问题的任何指示？

标签： javajsonjackson

java - Json 到 Java 对象的转换 - 在 Jackson 中失败

问题描述

解决方案

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