JSON 驼峰转下划线

最新推荐文章于 2024-03-27 14:35:00 发布

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最新推荐文章于 2024-03-27 14:35:00 发布

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分类专栏： JAVA 文章标签： json java

本文链接：https://blog.youkuaiyun.com/maoliangfei2011/article/details/52796662

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本文介绍如何在Java中将JSON对象的驼峰式键转换为下划线分隔的键。讨论了使用Jackson库和手动转换的方法，包括示例代码和应用场景。

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import com.fasterxml.jackson.databind.PropertyNamingStrategy.PropertyNamingStrategyBase;

public class MyCamemlToUnderlineCaseStrategy extends PropertyNamingStrategyBase {
	private static final long serialVersionUID = 1L;

	@Override
	public String translate(String input) {
		if (input == null)
			return input; // garbage in, garbage out
		int length = input.length();
		StringBuilder result = new StringBuilder(length * 2);
		int resultLength = 0;
		boolean wasPrevTranslated = false;
		for (int i = 0; i < length; i++) {
			char c = input.charAt(i);
			
			if (i > 0 || c != '_') // skip first starting underscore
			{
				if (c == '_') {
					if (!wasPrevTranslated && resultLength > 0 && !Character.isUpperCase(result.charAt(resultLength - 1))) {
						if (++i < length) {
							result.append(Character.toUpperCase(input.charAt(i)));
							resultLength++;
						}
					}
					wasPrevTranslated = true;
				} else {
					wasPrevTranslated = false;
					result.append(c);
					resultLength++;
				}
			}
		}
		return resultLength > 0 ? result.toString() : input;
	}
}

import java.io.IOException;
import java.io.Serializable;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;


public class JacksonTest {
	public static void main(String[] args) throws JsonParseException, JsonMappingException, IOException {
		ObjectMapper mapper = new ObjectMapper();
		String json = "{\"userName\":\"bflee\",\"idNumber\":\"123456\"}";
		mapper.setPropertyNamingStrategy(new MyCamemlToUnderlineCaseStrategy());
		O o = (O) mapper.readValue(json, O.class);
		System.out.println(o.getId_number());
	}
}
class O implements Serializable {
	private static final long	serialVersionUID	= -3004824622398622080L;
	private String				user_name;
	private String				id_number;
	public String getUser_name() {
		return user_name;
	}
	public void setUser_name(String user_name) {
		this.user_name = user_name;
	}
	public String getId_number() {
		return id_number;
	}
	public void setId_number(String id_number) {
		this.id_number = id_number;
	}
}