根据es的mapping生成VO

把es的properties粘贴进一个json文件就可以执行

加入依赖

    com.fasterxml.jackson.core
    jackson-databind
    2.12.4 

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.annotation.JsonProperty;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.annotation.JsonProperty;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.fasterxml.jackson.annotation.JsonProperty;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.Map;

public class VoGenerator {

    public static void main(String[] args) throws IOException {
        // 指定JSON文件路径
        String jsonFilePath = "D:\\software\\a.json";

        // 创建ObjectMapper对象
        ObjectMapper objectMapper = new ObjectMapper();

        // 读取JSON文件
        JsonNode jsonNode = objectMapper.readTree(new File(jsonFilePath));

        // 创建VO类字符串
        String voClass = generateVoClass("Vo", jsonNode);

        // 打印生成的VO类
        System.out.println(voClass);
    }

    private static String generateVoClass(String className, JsonNode jsonNode) {
        // 创建一个StringBuilder来构建VO类
        StringBuilder voClassBuilder = new StringBuilder();

        // 开始生成VO类
        voClassBuilder.append("public class ").append(capitalize(className)).append(" {\n");

        // 获取JSON对象的字段迭代器
        Iterator<Map.Entry<String, JsonNode>> fields = jsonNode.fields();

        while (fields.hasNext()) {
            Map.Entry<String, JsonNode> entry = fields.next();
            String fieldName = entry.getKey();
            JsonNode fieldNode = entry.getValue();

            if (fieldNode.has("type")) {
                String fieldType = getJavaFieldType(fieldNode);

                // 如果字段类型是"nested"，则生成嵌套的VO类列表
                if ("nested".equals(fieldType)) {
                    String nestedClassName = capitalize(fieldNameToCamelCase(fieldName)) + "Vo";
                    String nestedVoClass = generateVoClass(nestedClassName, fieldNode.get("properties"));
                    voClassBuilder.append("    @JsonProperty(\"").append(fieldName).append("\")\n");
                    voClassBuilder.append("    private List<").append(nestedClassName).append("> ").append(fieldNameToCamelCase(fieldName)).append(";\n");
                    voClassBuilder.append(nestedVoClass);
                } else {
                    // 生成VO类字段
                    voClassBuilder.append("    @JsonProperty(\"").append(fieldName).append("\")\n");
                    voClassBuilder.append("    private ").append(fieldType).append(" ").append(fieldNameToCamelCase(fieldName)).append(";\n");
                }
            }
        }

        // 结束VO类
        voClassBuilder.append("}\n");

        return voClassBuilder.toString();
    }

    private static String getJavaFieldType(JsonNode fieldNode) {
        // 根据JSON节点的类型来确定Java字段类型
        String fieldType;
        if (fieldNode.has("type")) {
            String type = fieldNode.get("type").asText();
            switch (type) {
                case "integer":
                    fieldType = "Integer";
                    break;
                case "float":
                    fieldType = "Float";
                    break;
                case "date":
                    fieldType = "Date"; // 需要导入java.util.Date类
                    break;
                case "nested":
                    fieldType = "nested";
                    break;
                default:
                    fieldType = "String";
                    break;
            }
        } else {
            fieldType = "String"; // 默认为String类型
        }
        return fieldType;
    }

    private static String fieldNameToCamelCase(String fieldName) {
        // 将下划线分隔的字段名转换为驼峰命名
        String[] parts = fieldName.split("_");
        StringBuilder camelCaseName = new StringBuilder();
        for (int i = 0; i < parts.length; i++) {
            String part = parts[i];
            if (i == 0) {
                camelCaseName.append(part);
            } else {
                camelCaseName.append(part.substring(0, 1).toUpperCase()).append(part.substring(1));
            }
        }
        return camelCaseName.toString();
    }

    private static String capitalize(String str) {
        // 将字符串的首字母大写
        if (str == null || str.isEmpty()) {
            return str;
        }
        return Character.toUpperCase(str.charAt(0)) + str.substring(1);
    }
}