Java 当其中一个POJO类具有hashmap（hashmap<；String，String>；）时，如何将JSON读入POJO类

我试图将.json文件中的json内容加载到POJO类中。其中一个POJO类有一个HashMap，因此我收到一个databind异常（据我所知）。有人能帮我解决吗

以下是我的POJO课程：

客户类别：

public class Customer {

private String name;
private Workflow workflow;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Workflow getWorkflow() {
        return workflow;
    }

    public void setWorkflow(Workflow workflow) {
        this.workflow = workflow;
    }

}

工作流类：

public class Workflow {

    private int loaCount;
    private BTA bTA;

    public int getLoaCount() {
        return loaCount;
    }

    public void setLoaCount(int loaCount) {
        this.loaCount = loaCount;
    }

    public BTA getbTA() {
        return bTA;
    }

    public void setbTA(BTA bTA) {
        this.bTA = bTA;
    }

}

BTA等级：

public class BTA {

    HashMap<String, String> tasks = new HashMap<String, String>();

    public BTA() {
        // do nothing
    }

    public BTA(int loaCount) {
        setTasks(loaCount);
    }

    private void setTasks(int loaCount) {
        for (int index = 0; index < loaCount; index++) {
            tasks.put("Task " + index, "Not Started");
        }
    }

    public HashMap<String, String> getTasks() {
        return tasks;
    }
}

JSON文件内容：

{
  "name" : "Santosh",
  "workflow" : {
    "loaCount" : 3,
    "bTA" : {
      "tasks" : {
        "Task 2" : "Not Started",
        "Task 1" : "Not Started",
        "Task 0" : "Not Started"
      }
    }
  }

我看到的例外情况是：

com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.lang.Integer out of START_OBJECT token
 at [Source: /Users/santosh/eclipse-workspace/RestAssuredTesting/customer.json; line: 6, column: 7] (through reference chain: com.jackson.Customer["workflow"]->com.jackson.Workflow["bTA"]->com.jackson.BTA["tasks"])
    at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:164)
    at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:575)
    at com.fasterxml.jackson.databind.deser.std.StdDeserializer._parseInteger(StdDeserializer.java:332)
    at com.fasterxml.jackson.databind.deser.std.NumberDeserializers$IntegerDeserializer.deserialize(NumberDeserializers.java:319)
    at com.fasterxml.jackson.databind.deser.std.NumberDeserializers$IntegerDeserializer.deserialize(NumberDeserializers.java:301)
    at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:464)
    at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:98)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:295)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
    at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:464)
    at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:98)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:295)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
    at com.fasterxml.jackson.databind.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:464)
    at com.fasterxml.jackson.databind.deser.impl.MethodProperty.deserializeAndSet(MethodProperty.java:98)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:295)
    at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:121)
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2888)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:1988)
    at com.jackson.JsonReaderWriter.reader(JsonReaderWriter.java:39)
    at com.jackson.JsonReaderWriter.main(JsonReaderWriter.java:11)

---

使用

@JsonProperty

将JSON节点

任务

映射为

b2aTasks

@JsonProperty("tasks")
Map<String, String> b2aTasks= new HashMap<String, String>();

更新： Json序列化程序使用setter方法设置值。setter方法接受int而不是map，这就是问题所在

private void setTasks(int loaCount) {
    for (int index = 0; index < loaCount; index++) {
        tasks.put("Task " + index, "Not Started");
    }
}

private void setTasks（int loaCount）{
for（int index=0；index

使用此方法获取贴图参数

public void setTasks(HashMap<String, String> map) {
    tasks = map;
}

publicsvoidsettasks（HashMap）{
任务=地图；
}

尝试了相同的方法，但无效。我仍然看到相同的异常。它在添加带有HashMap参数的setter之后工作。谢谢你的帮助

private void setTasks(int loaCount) {
    for (int index = 0; index < loaCount; index++) {
        tasks.put("Task " + index, "Not Started");
    }
}

public void setTasks(HashMap<String, String> map) {
    tasks = map;
}