java代码生成器

// FreeMarker配置
Configuration cfg = new Configuration(Configuration.VERSION_2_3_30);
cfg.setClassForTemplateLoading(JavaCodeGenerator.class, "/templates");
cfg.setDefaultEncoding("UTF-8");

// 加载模板
Template template = cfg.getTemplate("entity.ftl");

// 准备数据模型
Map<String, Object> data = new HashMap<>();
data.put("className", "User");
data.put("fields", Arrays.asList(
    new Field("id", "Long"),
    new Field("name", "String"),
    new Field("email", "String")
)));

// 生成代码
StringWriter out = new StringWriter();
template.process(data, out);
String generatedCode = out.toString();

System.out.println(generatedCode);

// entity.ftl
package com.example.entity;

public class ${className} {
<#list fields as field>
    private ${field.type} ${field.name};
</#list>

    // Getters and Setters
<#list fields as field>
    public ${field.type} get${field.name?cap_first}() {
        return this.${field.name};
    }

    public void set${field.name?cap_first}(${field.type} ${field.name}) {
        this.${field.name} = ${field.name};
    }
</#list>
}