java Simple Sping Boot filter无法正常工作

我试图访问一个应用了一些过滤器的spring Boot 应用程序的端点，但过滤器无法正常工作。我需要一些关于这个问题的帮助，我在下面提供了可疑的东西。

package com.ronit.Restfulwebservice.filtering;

import java.util.Arrays;
import java.util.List;

import org.springframework.http.converter.json.MappingJacksonValue;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import com.fasterxml.jackson.databind.ser.FilterProvider;
import com.fasterxml.jackson.databind.ser.impl.SimpleBeanPropertyFilter;
import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;

@RestController
public class FilteringController {
    @GetMapping("/filtering")
    public MappingJacksonValue filtering() {
        
        SomeBean someBean = new SomeBean("value1", "value2", "value3");
        
        MappingJacksonValue mappingJacksonValue = new MappingJacksonValue(someBean);
        
        SimpleBeanPropertyFilter filter = 
                SimpleBeanPropertyFilter.filterOutAllExcept("field1","field3");
        
        FilterProvider filters = 
                new SimpleFilterProvider().addFilter("SomeBeanFilter", filter);
        
        mappingJacksonValue.setFilters(filters);
        
        return mappingJacksonValue;
    }

    @GetMapping("/filtering-list")
    public MappingJacksonValue filteringList() {
        
        List<SomeBean> list = Arrays.asList(new SomeBean("value1", "value2", "value3"),
                new SomeBean("value4", "value5", "value6"));
        
        MappingJacksonValue mappingJacksonValue = new MappingJacksonValue(list);
        
        SimpleBeanPropertyFilter filter = 
                SimpleBeanPropertyFilter.filterOutAllExcept("field2");
        
        FilterProvider filters = 
                new SimpleFilterProvider().addFilter("SomeBeanFilter", filter);
        
        mappingJacksonValue.setFilters(filters);
        
        return mappingJacksonValue;
    }
}

字符串
这是SomeBean类

package com.ronit.Restfulwebservice.filtering;

import com.fasterxml.jackson.annotation.JsonFilter;
//@JsonIgnoreProperties({"field1"})
public class SomeBean {
    private String field1;
    //@JsonIgnore
    @JsonFilter("SomeBeanFilter")
    //@JsonFilter("ListFilter")
    private String field2;
    private String field3;

    public SomeBean(String field1, String field2, String field3) {
        super();
        this.field1 = field1;
        this.field2 = field2;
        this.field3 = field3;
    }

    public String getField1() {
        return field1;
    }

    public String getField2() {
        return field2;
    }

    public String getField3() {
        return field3;
    }

    @Override
    public String toString() {
        return "SomeBean [field1=" + field1 + ", field2=" + field2 + ", field3=" + field3 + "]";
    }
}

型
这是Application类

package com.ronit.Restfulwebservice;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class RestfulWebServiceApplication {

    public static void main(String[] args) {
        SpringApplication.run(RestfulWebServiceApplication.class, args);
    }

}

型
application.properties文件

logging.level.org.springframework=debug

型
pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.1.1</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.ronit</groupId>
    <artifactId>Restful-web-service</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>Restful-web-service</name>
    <description>My first rest api </description>
    <properties>
        <java.version>20</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-hateoas</artifactId>
        </dependency>
        <!--<dependency>
            <groupId>org.springdoc</groupId>
            <artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>
            <version>2.1.0</version>
            </dependency>-->
            <!-- This dependency below converts json file to xml format without this dependency
             xml instead of json is given to the browser and the browser displays the same -->
        <!--<dependency>
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-xml</artifactId>
        </dependency>-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

型
http：//localhost：8080/filtering-list端点的JSON响应

[
{
"field1": "value1",
"field2": "value2",
"field3": "value3"
},
{
"field1": "value4",
"field2": "value5",
"field3": "value6"
}
]

型
http：//localhost：8080/filtering端点的JSON响应

{
"field1": "value1",
"field2": "value2",
"field3": "value3"
}

型
我正在学习udemy的课程，我在教程中做了完全相同的事情，并按照github上的一步一步的指南构建了完全相同的东西，但它不起作用。我已经在网上搜索了解决方案，但我没有找到，请帮助我解决这个问题。如果需要任何更多的细节，请提前询问谢谢

根据提供的代码，您似乎正在使用Jackson的MappingJacksonValue和SimpleBeanPropertyFilter对JSON响应应用动态过滤。代码看起来正确，端点 */filtering-list * 的响应看起来正常。但是，该问题可能与过滤器的配置或使用有关。
下面，我建议检查一些要点：

**1.**验证ObjectMapper bean是否在应用中正确配置。确保向ObjectMapper bean注册FilterProvider，以便它识别过滤器。
**2.**确保SomeBean类使用@JsonFilter（“SomeBeanFilter”）进行注解，您已经正确使用了该注解。
**3.**检查可能影响JSON响应的任何其他过滤器或拦截器配置。
**4.**确保您访问的是端点 */过滤 * 的正确URL。

配置bean的示例：

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ser.FilterProvider;
import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;

@Configuration
public class JacksonConfig {
    @Bean
    public ObjectMapper objectMapper() {
        ObjectMapper objectMapper = new ObjectMapper();
        FilterProvider filters = new SimpleFilterProvider().addFilter("SomeBeanFilter",
                SimpleBeanPropertyFilter.serializeAllExcept("field2"));
        objectMapper.setFilterProvider(filters);
        return objectMapper;
    }
}

字符串
如果您已经尝试了上述步骤，但问题仍然存在，我建议您检查其他自定义配置、过滤器或拦截器是否可能干扰过滤过程。此外，在访问 */过滤 * 端点时，请检查是否有任何错误日志或异常。

java Simple Sping Boot filter无法正常工作

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