java - 映射嵌套枚举时获取 JsonMappingException

Question

我使用spring RestTemplate并将json响应转换为pojo。但得到一个 JsonMappingException

POJO

@Root
public class Account {

@Element
private int id;
@Element
private int customerId;
@Element
private AccountType type;
@Element
private BigDecimal balance;

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

public int getCustomerId() {
    return customerId;
}

public void setCustomerId(int customerId) {
    this.customerId = customerId;
}

public AccountType getType() {
    return type;
}

public int getIntType() {
    return type.ordinal();
}

public void setType(AccountType type) {
    this.type = type;
}

public void setType(int type) {
    this.type = AccountType.values()[type];
 }

public BigDecimal getBalance() {
    return balance;
}

public void setBalance(BigDecimal balance) {
    this.balance = balance;
}

public BigDecimal getAvailableBalance() {
    return balance.signum() < 0 ? new BigDecimal(0) : balance; 
}

public void credit(BigDecimal amount) {
    balance = balance.add(amount);
}

public void debit(BigDecimal amount) {
    balance = balance.subtract(amount);
}






public static enum AccountType {
    CHECKING(false), SAVINGS(false), LOAN(true);

    private boolean internal;

    private AccountType(boolean internal) {
        this.internal = internal;
    }

    public boolean isInternal() {
        return internal;
    }
  }
}

休息客户端

RestTemplate restTemplate = new RestTemplate();
      List<HttpMessageConverter<?>> messageConverters = new ArrayList<HttpMessageConverter<?>>();
     List<MediaType> supportedMediaTypes = new ArrayList<MediaType>();
     MediaType mediaType = new MediaType("application", "json", Charset.forName("UTF-8"));
     supportedMediaTypes.add(mediaType);
     MappingJackson2HttpMessageConverter jacksonConverter = new MappingJackson2HttpMessageConverter();
     jacksonConverter.setSupportedMediaTypes(supportedMediaTypes);
     messageConverters.add(jacksonConverter);
     restTemplate.setMessageConverters(messageConverters);

    Account [] accounts =  restTemplate.getForObject(url, new Account[0].getClass());`

异常

 Caused by: org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Conflicting setter definitions for property "type": com.entity.Account#setType(1 params) vs com.entity.Account#setType(1 params); nested exception is com.fasterxml.jackson.databind.JsonMappingException: Conflicting setter definitions for property "type": com.entity.Account#setType(1 params) vs com.entity.Account#setType(1 params)
at org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.readInternal(MappingJackson2HttpMessageConverter.java:126)
at org.springframework.http.converter.AbstractHttpMessageConverter.read(AbstractHttpMessageConverter.java:147)
at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:76)
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:484)
at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:439)
at org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:237)`

Answer 1

问题是您有 2 个名为 setType 的方法，而转换器不知道使用哪一个。将注释 @JsonIgnore 放在您不想要用于反序列化的方法上，这应该可以解决问题。