一個有趣的小功能:可能有些時候需要寫文件,需要將java的一些物件(vo/po/do/dto等)的屬性和屬性型別提取出來,以表格的形式展示.

java物件:

package com.test;

/**
 * Created by Administrator on 2018/8/31.
 */
public class User {
    private String userName;
    private String sex;
    private Integer age;

    public String getUserName() {
        return
 
 userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Integer getAge() {
        return age;
    }

    public void
 
 setAge(Integer age) {
        this.age = age;
    }
}

主函式:

import com.test.DirectShipAddressVO;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.lang.reflect.Field;

public class Main {

    public static String reflect(Class<?> obj, String content) {
        Field[] fields = obj.getDeclaredFields();
        for
 
 (int i = 0; i < fields.length; i++) {
            String name = fields[i].getName();
            Class<?> type = fields[i].getType();
            String typeRes = "";
            if (type != null) {
                String tmp = type.getName();
                typeRes = tmp.substring(tmp.lastIndexOf('.')+1, tmp.length());
            }
            content += "|" + name + "|" + typeRes + "|||\r\n";
            //System.out.print("|" + name + "|" + typeRes + "|||\r\n");
        }
        return content;
    }

    public static void saveAsFileWriter(String content, String classsName) {
        classsName = classsName.substring(classsName.lastIndexOf('.')+1, classsName.length());
        String savefile = "F:\\workspace\\reflect\\" + classsName + ".md";
        FileWriter fwriter = null;
        try {
            File file = new File(savefile);
            if(!file.exists()) {
                file.createNewFile();
            }
            fwriter = new FileWriter(savefile);
            fwriter.write(content);
        } catch (IOException ex) {
            ex.printStackTrace();
        } finally {
            try {
                fwriter.flush();
                fwriter.close();
            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }


    public static void main(String[] args) {
        Class<User> obj = User.class;
        String content = "####資料庫文件\r\n\r\n|欄位資訊|型別|中文說明|備註資訊|\r\n|-----|-----|-----|-----|\r\n";
        String res = reflect(obj, content);
        System.out.println(res);
        saveAsFileWriter(res,obj.getName());
    }
}

markdown檔案:

####資料庫文件

|欄位資訊|型別|中文說明|備註資訊|
|-----|-----|-----|-----|
|userName|String|||
|sex|String|||
|age|Integer|||

結果展示: