问题描述
String cardExpiration = "1022"; //I can format it as needed
使用Jackson的libray,我需要创建以下JSON:
{
"cardExpiration":"10\/22"
}
我正在使用以下代码
String cardExpiration = "10\\/22";
MyPojo myPojo = new MyPojo(cardExpiration);
ObjectMapper mapper = new ObjectMapper();
String json = mapper.writeValueAsstring(myPojo);
此代码返回带有“ 10 \\ / 22”(双反斜杠,但我只需要一个反斜杠)的JSON。 我无法在Java字符串“ 10 \ / 22”中创建,因为它是字符串文字中的非法转义字符。 知道如何获取JSON “ 10 \ / 22” 吗?
解决方法
用第二个转义符将反斜杠定义为String。
String cardExpiration = "10\\/22";
System.out.println(cardExpiration); // prints 10\/22
这里有一个工作示例,其中包括使用Jackson序列化POJO的用法。请注意,Jackson在JSON自动中转义了反斜杠。为了你。如果您确实想要JSON值{"cardExpiration":10\/22}
,则可以在POJO的@JsonRawValue注释中添加属性。
pom.xml
<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.mycompany.app</groupId>
<artifactId>my-app</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.11.2</version>
</dependency>
</dependencies>
</project>
App.java
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class App {
public static void main(String[] args) throws JsonProcessingException {
String cardExpiration = "10\\/22";
System.out.println(cardExpiration); // prints 10\/22
MyPojo myPojo = new MyPojo(cardExpiration);
ObjectMapper mapper = new ObjectMapper();
String json = mapper.writeValueAsString(myPojo);
System.out.println(json); // prints {"cardExpiration":"10\\/22"}
}
}
class MyPojo {
String cardExpiration;
public MyPojo(String cardExpiration) {
this.cardExpiration = cardExpiration;
}
public String getCardExpiration() {
return cardExpiration;
}
public void setCardExpiration(String cardExpiration) {
this.cardExpiration = cardExpiration;
}
}