Jackson API提供了许多方法来处理JSON数据。通过使用Jackson API，我们可以将Java对象转换为JSON字符串，并从JSON字符串中重构对象。我们可以使用StdSerializer类实现自定义序列化器，并需要重写serialize(T value, JsonGenerator gen, SerializerProvider provider)方法，第一个参数value表示要序列化的值（不能为空），第二个参数gen表示用于输出结果Json内容的生成器，第三个参数provider表示可用于获取用于序列化对象值的序列化器的提供程序。
语法
public abstract void serialize(T value, JsonGenerator gen, SerializerProvider provider) throws IOException
Example
翻译成中文为：示例
import java.io.*;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.databind.module.*;
import com.fasterxml.jackson.databind.ser.std.StdSerializer;
public class JacksonSerializeTest {
public static void main(String[] args) throws Exception {
JacksonSerializeTest test = new JacksonSerializeTest();
test.serialize();
}
public void serialize() throws Exception {
User user = new User();
user.setFirstName("Raja");
user.setLastName("Ramesh");
ObjectMapper mapper = new ObjectMapper();
SimpleModule module = new SimpleModule();
module.addSerializer(User.class, new UserSerializer());
mapper.registerModule(module);
String jsonStr = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(user); // pretty print
System.out.println(jsonStr);
}
}
// User class
class User implements Serializable {
private String firstName;
private String lastName;
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;
}
}
// UserSerializer class
class UserSerializer extends StdSerializer<User> {
public UserSerializer() {
this(null);
}
public UserSerializer(Class<User> t) {
super(t);
}
<strong> </strong>@Override
public void serialize(User value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonProcessingException {
jgen.writeStartObject();
jgen.writeStringField("firstName", value.getFirstName());
jgen.writeStringField("lastName", value.getLastName());
jgen.writeEndObject();
}
}输出
{
"firstName" : "Raja",
"lastName" : "Ramesh"
} 
