Question

如何让@JsonIgnore工作我有一堂课。即使我把注释放在那里它对输出也没有影响。我正在使用杰克逊。

public class QuestionBlock implements ComparableByID{


    int ID;

    String title;
    String description;
    boolean deleted;
    boolean isDraft;
    boolean visible;
    Timestamp modifiedDate;
    String modifiedBy;


    private List<Question> questions =  new ArrayList<>();

    @JsonIgnore
    private List<Survey> surveys =  new ArrayList<>();

    ...

    @JsonIgnore
    public List<Survey> getSurveys() {
        return surveys;
    }

    @JsonIgnore
    public void setSurveys(List<Survey> surveys) {
        this.surveys = surveys;
    }

}

这是我的控制器方法：

@RequestMapping(value = "/questionBlock/{id}",produces = "application/json;charset=UTF-8")
    @ResponseBody
    public QuestionBlock getQuestionBlock(@PathVariable("id") int id) {
        return surveyService.getQuestionBlock(id);
    }

这是我的servlet-context.xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:beans="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
    http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">

    <mvc:annotation-driven />


    <mvc:resources mapping="/resources/**" location="/resources/" />
    <mvc:resources location="/, classpath:/META-INF/web-resources/"
        mapping="/resources/**" />

    <context:property-placeholder location="classpath*:META-INF/*.properties" />


    <context:component-scan base-package="com.adam.czibere" />



    <bean class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close" id="myDataSource" name="dataSource">
        <property name="driverClassName" value="${database.driverClassName}" />
        <property name="url" value="${database.url}" />
        <property name="username" value="${database.username}" />
        <property name="password" value="${database.password}" />
        <property name="testOnBorrow" value="true" />
        <property name="testOnReturn" value="true" />
        <property name="testWhileIdle" value="true" />
        <property name="timeBetweenEvictionRunsMillis" value="1800000" />
        <property name="numTestsPerEvictionRun" value="3" />
        <property name="minEvictableIdleTimeMillis" value="1800000" />
        <property name="validationQuery" value="SELECT 1" />
    </bean>


    <bean id="mySessionFactory"
        class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
        <property name="dataSource" ref="myDataSource" />
        <property name="packagesToScan">
            <array>
                <value>com.adam.czibere</value>
            </array>
        </property>
        <property name="hibernateProperties">
            <value>
                hibernate.dialect=org.hibernate.dialect.MySQLDialect
            </value>
        </property>
    </bean>

    <bean id="transactionManager"
        class="org.springframework.orm.hibernate4.HibernateTransactionManager">
        <property name="sessionFactory" ref="mySessionFactory" />
    </bean>


    <tx:annotation-driven transaction-manager="transactionManager"/>

<bean
        class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
        <property name="mediaTypes">
            <map>
                <entry key="html" value="text/html" />
                <entry key="json" value="application/json" />
            </map>
        </property>
        <property name="viewResolvers">
            <list>
                <bean
                    class="org.springframework.web.servlet.view.InternalResourceViewResolver">
                    <property name="prefix" value="/WEB-INF/views/" />
                    <property name="suffix" value=".jsp" />
                </bean>
            </list>
        </property>
        <property name="defaultViews">
            <list>
                <bean
                    class="org.springframework.web.servlet.view.json.MappingJacksonJsonView">
                    <property name="prefixJson" value="false" />
                    <property name="objectMapper" ref="jacksonObjectMapper" />
                </bean>
            </list>
        </property>
    </bean>
    <bean id="jacksonObjectMapper" class="org.codehaus.jackson.map.ObjectMapper" />
    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <bean
                    class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
                    <property name="prefixJson" value="false" />
                    <property name="supportedMediaTypes" value="application/json" />
                </bean>
            </list>
        </property>
    </bean>
</beans>

Answer 1

我终于找到了解决方案。我从

更改了import语句

import org.fasterxml.jackson.annotate.JsonIgnore;

到

import org.codehaus.jackson.annotate.JsonIgnore;

基本上你必须确保你到处使用同一个班级。

Answer 2

注释应仅在'get'方法上。你似乎在你的私人领域有@Json ...注释。

Answer 3

如果您正在使用Jackson的实现并且其注释不起作用，那可能是因为您有更好的优先级的杰克逊的另一个依赖。因此，如果你想确保杰克逊普遍存在的某些实现（恕我直言，最好的选择是你已经注释过的所有类的一个，因为可能它带有其他依赖项）在应用程序模块的pom中指定这种依赖。因此，如果您在多个模块中使用

注释所有实体

import org.fasterxml.jackson.annotate.JsonIgnore;

不是替换所有导入，只需在应用程序pom中指定相应的依赖项：

    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
    </dependency>

这将向Spring Boot澄清这是您要使用的实现。

Answer 4

将 @JsonProperty(access = JsonProperty.Access.WRITE_ONLY) 放在字段声明之前为我解决了问题。

    @JsonProperty(access = JsonProperty.Access.WRITE_ONLY)
    private List<Survey> surveys =  new ArrayList<>();

我使用的是 jackson 版本 2.11.3

Answer 5

您需要更改org.codehaus.jackson版本。我目前正在使用@JsonIgonre的1.1.1版本不管用。我用1.9.13更改了它，然后@JsonIgnore工作正常。

    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-jaxrs</artifactId>
        <version>1.1.1</version>
    </dependency>

    Change to 

   <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-jaxrs</artifactId>
        <version>1.9.13</version>
    </dependency>

Java代码是： -

import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import org.codehaus.jackson.annotate.JsonIgnore;

@Entity
@Table(name="users")
public class Users implements Serializable{

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Integer id;
    private String username;
    private String firstname;
    @JsonIgnore
    private String lastname;

    public Integer getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getFirstname() {
        return firstname;
    }

    public void setFirstname(String firstname) {
        this.firstname = firstname;
    }

    public String getLastname() {
        return lastname;
    }

    public void setLastname(String lastname) {
        this.lastname = lastname;
    }

}

Answer 6

我在使用spring和hibernate时遇到了同样的问题。原因是在实体类中我使用的是org.codehaus.jackson.JsonIgnore，而在春天我使用的是com.fasterxml.jackson.jaxrs.JsonIgnore。修复两个层中的任何一个库，问题将消失。

Answer 7

我在项目中遇到了这个问题，最后我找到了解决方案。

替换依赖项...

    <dependency>
        <groupId>org.codehaus.jackson</groupId>
        <artifactId>jackson-jaxrs</artifactId>
        <version>1.9.13</version>
    </dependency>

导入：com.fasterxml.jackson.annotation.JsonIgnore;

我希望，它将成功。

Answer 8

就我而言，JsonIgnore并非仅在日期上工作。然后我知道那是因为我使用@JsonFormat（）定义日期格式。删除即可解决问题。

Answer 9

我为boolean添加了@Getter（onMethod _ = @ JsonIgnore）。

import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@JsonIgnoreProperties(ignoreUnknown = true) 
public class TestClass    {

    
     @JsonIgnore 
    private String name;
    
     @Getter(onMethod_=@JsonIgnore) 
    private boolean isValid; 

}

Spring @JsonIgnore无法正常工作

9 个答案: