使用jackson將java對象轉換爲json字符串時複製json屬性

我有Pojo對象，並帶有getAsJson函數來爲此對象返回Json字符串。我使用JsonProperty在此對象中定義json屬性。使用ObjectMapper的writeValueAsString爲此對象編寫json字符串。使用jackson將java對象轉換爲json字符串時複製json屬性

import org.codehaus.jackson.JsonGenerationException; 
import org.codehaus.jackson.annotate.JsonIgnore; 
import org.codehaus.jackson.annotate.JsonIgnoreProperties; 
import org.codehaus.jackson.annotate.JsonProperty; 
import org.codehaus.jackson.map.JsonMappingException; 
import org.codehaus.jackson.map.ObjectMapper; 

@JsonIgnoreProperties(ignoreUnknown=true) 
public class LogLikeArticleDetail extends BaseObject { 
    private static final long serialVersionUID = -2018373118257019033L; 
    @JsonProperty("LikeArticleGUId") 
    private String likeArticleGUId; 
    @JsonProperty("UserId") 
    private String userID; 
    @JsonProperty("UserName") 
    private String userName; 
    @JsonProperty("IP") 
    private String ip; 
    @JsonProperty("OS") 
    private String os; 
    @JsonProperty("UserAgent") 
    private String userAgent; 
    @JsonProperty("WebsiteCode") 
    private String websiteCode; 
    @JsonProperty("ArticleId") 
    private String articleID; 
    @JsonProperty("ATitle") 
    private String aTitle; 
    @JsonProperty("CateAlias") 
    private String cateAlias; 
    @JsonProperty("LikeStatus") 
    private String likeStatus; 
    @JsonProperty("TimeStamp") 
    private Date timeStamp; 
     //get, set.... 
     //.... 
     @JsonIgnore 
    public String getAsJSON() throws JsonGenerationException, JsonMappingException, IOException{ 
     ObjectMapper mapper = new ObjectMapper(); 
     return mapper.writeValueAsString(this) ; 
    } 
}

現在，我得到的結果

public static void main(String[] args) throws JsonGenerationException, JsonMappingException, IOException { 
     Calendar calendar = Calendar.getInstance(); 
     LogLikeArticleDetail logLikeArticle = new LogLikeArticleDetail("1","2","3","4","5","6","7","8","what thing \"nothing\" show","10","11",calendar.getTime()); 
     System.out.println(logLikeArticle.getAsJSON()); 
    }

但結果的重複屬性：

{"LikeArticleGUId":"1","UserId":"2","UserName":"3","IP":"4","OS":"5","UserAgent":"6","WebsiteCode":"7","ArticleId":"8","ATitle":"what thing \"nothing\" show","CateAlias":"10","LikeStatus":"11","TimeStamp":1352256727062,"_likeArticleGUId":"1","websiteCode":"7","likeStatus":"11","userID":"2","userName":"3","ip":"4","os":"5","userAgent":"6","articleID":"8","aTitle":"what thing \"nothing\" show","cateAlias":"10","timeStamp":1352256727062}

什麼的發生在這個問題讓我看看？

來源

2012-11-07 Sonrobby

我想這可能是答案：http://stackoverflow.com/questions/7105745/how-to-specify-jackson-to-only-use-fields-preferably-globally – pawelzieba

哦，是的，謝謝@pawelzieba這是答案。 – Sonrobby

，所以我遵循： how to specify jackson to only use fields - preferably globally

我之前

public class LogLikeArticleDetail extends BaseObject

和我想要的結果添加

@JsonAutoDetect(fieldVisibility = Visibility.ANY, getterVisibility = Visibility.NONE, setterVisibility = Visibility.NONE)

。

所以可以在另一個解決在getAsJson（）函數，如：

ObjectMapper mapper = new ObjectMapper(); 
mapper.setVisibilityChecker(mapper.getSerializationConfig().getDefaultVisibilityChecker() 
       .withFieldVisibility(JsonAutoDetect.Visibility.ANY) 
       .withGetterVisibility(JsonAutoDetect.Visibility.NONE) 
       .withSetterVisibility(JsonAutoDetect.Visibility.NONE) 
       .withCreatorVisibility(JsonAutoDetect.Visibility.NONE)); 
return mapper.writeValueAsString(this) ;

感謝@Sean匠的問題，@鏈路kmb385回答以上。

來源

2012-11-09 07:54:31 Sonrobby

您也可以使用註釋對每個POJO執行此操作。這個字符串添加到您的類的頂部，你想上沒有自動檢測：

@JsonAutoDetect（fieldVisibility = JsonAutoDetect.Visibility.ANY， getterVisibility = JsonAutoDetect.Visibility.NONE， setterVisibility = JsonAutoDetect.Visibility .NONE， creatorVisibility = JsonAutoDetect.Visibility.NONE）

例如：

@JsonAutoDetect(fieldVisibility=JsonAutoDetect.Visibility.ANY, getterVisibility=JsonAutoDetect.Visibility.NONE, 
     setterVisibility=JsonAutoDetect.Visibility.NONE, creatorVisibility=JsonAutoDetect.Visibility.NONE) 
class Play { 
    @JsonProperty("Name") 
    private String name; 

    @JsonProperty("NickName") 
    private String nickName; 

    public Play(){ 

    } 

    public String getName() { 
     return name; 
    } 

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

    public String getNickName() { 
     return nickName; 
    } 

    public void setNickName(String nickName) { 
     this.nickName = nickName; 
    } 
}

這將返回I」的屬性已經定義並且不會自動檢測字段名稱並將它們添加到我返回的JSON結果中。

來源

2016-11-28 11:11:39 mkwyche

使用jackson將java對象轉換爲json字符串時複製json屬性

回答

相關問題