使用freemarker生成java文件，其他文件也可以

参考地址

freemarker 使用模板文件快速创建文件

demo:

package com.company;

import freemarker.template.Configuration;
import freemarker.template.DefaultObjectWrapper;
import freemarker.template.Template;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * @author cunxp
 * @date 2018/8/31
 * @description
 */
public class TestFreeMarker {

  public static void main(String[] args) {
    try {
      Map root = new HashMap();
      root.put("package", "com.chinaoly.job.entity");
      root.put("user", "cunxp");
      root.put("date", "2018/08/31");
      root.put("tableName", "task");
      root.put("className", "Task");
      List data = new ArrayList();
      data.add("@Column(name = \"task_name\")\nprivate String taskName;\n");
      data.add("@Column(name = \"task_description\")\nprivate String taskDescription;\n");
      data.add("@Column(name = \"file_name\")\nprivate String fileName; \n");
      root.put("data", data);
      Configuration cfg = new Configuration(Configuration.VERSION_2_3_28);
      cfg.setDirectoryForTemplateLoading(new File("E:/project/hivetest/template/"));
      cfg.setObjectWrapper(new DefaultObjectWrapper(Configuration.VERSION_2_3_28));
      Template temp = cfg.getTemplate("demo.ftl");
      String fileName = "demo.java";
      File file = new File("E:/project/hivetest/template/" + fileName);
      FileWriter fw = new FileWriter(file);
      BufferedWriter bw = new BufferedWriter(fw);
      temp.process(root, bw);
      bw.flush();
      fw.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

　　模板文件：

package ${package};

import org.hibernate.annotations.GenericGenerator;
import javax.persistence.*;
import java.io.Serializable;
import java.util.Date;
/**
 * @author ${user}
 * @date ${date}
 * @description
 */
@Entity
@Table(name = "${tableName}")
public class ${className} implements Serializable {
    private static final long serialVersionUID = 1L;
<#list data as row>
${row}
</#list>
}