（转）@JsonRawValue 按原样序列化属性

@JsonRawValue 按原样序列化属性_赵丙双的博客-CSDN博客_序列化属性

@JsonRawValue 注解能够按原样序列化属性。属性值不会被转义或者加引号（或者说，会自动去掉转义，多余的引号）。属性值已经是一个 JSON String，或者属性值已经被加了引号时很有用。

Example

POJO

public class Report {
    private long id;
    private String name;
    @JsonRawValue
    private String content;
    ...
}    

序列化

public class ExampleMain {
    public static void main(String[] args) throws IOException {
        Report r = new Report();
        r.setId(1);
        r.setName("Test report");
        r.setContent("\"data\"");

        System.out.println("-- before serialization --");
        System.out.println(r);

        ObjectMapper om = new ObjectMapper();
        String jsonString = om.writeValueAsString(r);
        System.out.println("-- after serialization --");
        System.out.println(jsonString);
    }
}

直接序列化为 data，而不是 “data”

-- before serialization --
Report{id=1, name='Test report', content='"data"'}
-- after serialization --
{"id":1,"name":"Test report","content":"data"}

属性值为 JSON String

public class ExampleMain2 {
    public static void main(String[] args) throws IOException {
        Report r = new Report();
        r.setId(1);
        r.setName("Test report");
        r.setContent("{\"author\":\"Peter\", \"content\":\"Test content\"}");

        System.out.println("-- before serialization --");
        System.out.println(r);

        ObjectMapper om = new ObjectMapper();
        String jsonString = om.writeValueAsString(r);
        System.out.println("-- after serialization --");
        System.out.println(jsonString);
    }
}

content 没有以字符串的形式序列化，而是以 JSON 对象的形式序列化

-- before serialization --
Report{id=1, name='Test report', content='{"author":"Peter", "content":"Test content"}'}
-- after serialization --
{"id":1,"name":"Test report","content":{"author":"Peter", "content":"Test content"}}

不使用 @JsonRawValue

content 会以字符串的形式序列化

-- before serialization --
Report{id=1, name='Test report', content='{"author":"Peter", "content":"Test content"}'}
-- after serialization --
{"id":1,"name":"Test report","content":"{\"author\":\"Peter\", \"content\":\"Test content\"}"}

原文链接

Jackson JSON - Using @JsonRawValue to serialize property as it is