Question

我的问题与Prevent GSON from serializing JSON string类似，但是那里的解决方案使用了GSON库，我只能使用Jackson（fastxml）。

我有一个实体类如下：

package com.dawson.model;

import com.dawson.model.audit.BaseLongEntity;
import lombok.extern.log4j.Log4j;

import javax.persistence.*;

@Table(name = "queue", schema = "dawson")
@Entity
@Log4j
public class Queue extends BaseLongEntity {
    protected String requestType;
    protected String body;

    protected Queue() {
    }

    public Queue(String requestType, String body) {
        this.requestType = requestType;
        this.body = body;
    }

    @Column(name = "request_type")
    public String getRequestType() {
        return requestType;
    }

    public void setRequestType(String requestType) {
        this.requestType = requestType;
    }

    @Column(name = "body")
    @Lob
    public String getBody() {
        return body;
    }
    public void setBody(String body) {
        this.body = body;
    }
}

我想用地图的json字符串表示填充body字段，然后将其作为ResponseEntity的一部分发送。如下：

ObjectMapper mapper = new ObjectMapper();
mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
mapper.writer().withDefaultPrettyPrinter();

HashMap<String, String> map = new HashMap<>(5);
map.put("inquiry", "How Can I solve the problem with Jackson double serialization of strings?");
map.put("phone", "+12345677890");
Queue queue = null;
try {
    queue = new Queue("General Inquiry", mapper.writeValueAsString(map));
} catch (JsonProcessingException e) {
    e.printStackTrace();
}

String test = mapper.writeValueAsString(map)
System.out.println(test);

预期输出："{"requestType": "General Inquiry","body": "{"inquiry":"How Can I solve the problem with Jackson double serialization of strings?","phone":"+12345677890"}"}"

实际输出："{"requestType": "General Inquiry","body": "{\"inquiry\":\"How Can I solve the problem with Jackson double serialization of strings?\",\"phone\":\"+12345677890\"}"}"

我正在使用

Jackson Core v2.8.2

我尝试过玩

@JsonIgnore

和

@JsonProperty

标签，但这没有用，因为我的字段在写入实体时已经从地图序列化了。

Answer 1

将@JsonRawValue注释添加到body属性。这使得Jackson将属性的内容视为文字JSON值，不应对其进行处理。

请注意，杰克逊不对该字段的内容进行任何验证，这使得生成无效的JSON变得非常容易。

Answer 2

使用此Jackson: how to prevent field serialization (while keeping deserialization)

@JsonIgnore
public String password;

@JsonIgnore
public String getPassword() {
    return password;
}

@JsonProperty
public void setPassword(String password) {
    this.password = password;
}

Jackson：防止序列化散列映射获得的json字符串的序列化

2 个答案: