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題主, 因入職新公司, 表設計混亂, 不得不手動寫一個小指令碼,獲取所有欄位後,重新寫入至新表中;

思路

順序如下

原sql

具體, 獲取行 , 根據行開頭的"  ,"擷取內容, 重新輸入到txt, 中就可以了; 

程式碼

這裡就寫下 java8 的如何讀取和寫入吧

package xxx.xxx.xx;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.charset.Charset;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;

/**
 * @author ：wuxw
 * @ClassName : test
 * @description： TODO
 * @date ：2019/3/22 11:54
 * @version: 1.0
 */
public class test {
    public static void  main(String[] args){
        String filePath = "e:/textDb.txt";
        List<String> lineLists = readTextFile(filePath);
        // 將每行內容分割 最後輸出到文字
        Map<String,ColumnBean> tempMap = new HashMap<String,ColumnBean>();
        lineLists.forEach(i ->{
            String[] temp = i.split("\\s+");
            ColumnBean tempBean = new ColumnBean();
            if(temp.length>0){
                tempBean.setCode(temp[1]);
                tempBean.setCtype(temp[2]);
                tempBean.setIsEmpty(temp[3]);
                if(temp.length == 6 ){
                    tempBean.setCommont(temp[5]);
                }
                if(temp.length == 7 ){
                    tempBean.setNote(temp[6]);
                }
                if(!tempMap.containsKey(temp[1])){
                    tempMap.put(temp[1],tempBean);
                }
            }
        });
        for(ColumnBean c : tempMap.values()){
            System.out.println(c.toString()+"----------");
        }
        List<ColumnBean> mapKeyList = new ArrayList<ColumnBean>(tempMap.values());
        mapKeyList.forEach(i -> {
            System.out.println("--------"+i.toString());
        });
        beanToTxt("e:/beanDb3.txt",mapKeyList);
    }
    /**
     * @Author wuxw
     * @Description 行內容版 - 將字串內容寫入文字
     * @Date 17:12 2019/3/22
     * @Param [filePath, content]
     * @return void
     **/
    public static void contentToTxt(String filePath, String content) {
        try{
            BufferedWriter writer = new BufferedWriter(new FileWriter(new File(filePath),true));
            writer.write(content);
            writer.close();
        }catch(Exception e){
            e.printStackTrace();
        }
        System.out.println("檔案寫入完畢,檔案路徑:"+filePath);
    }
    /**
     * @Author wuxw
     * @Description 陣列迴圈寫入文字
     * @Date 17:12 2019/3/22
     * @Param [filePath, listStr]
     * @return void
     **/
    public static void contentToTxt(String filePath, List<String> listStr) {
        try{
            BufferedWriter writer = new BufferedWriter(new FileWriter(new File(filePath),true));
            listStr.forEach(str ->{
                try {
                    if(str.startsWith("  `")) {
                        writer.newLine();
                        writer.write(str);
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
            });
            writer.close();
        }catch(Exception e){
            e.printStackTrace();
        }
        System.out.println("檔案寫入完畢,檔案路徑:"+filePath);
    }
    /**
     * @Author wuxw
     * @Description bean轉成行輸出至txt
     * @Date 17:11 2019/3/22
     * @Param [filePath, listStr]
     * @return void
     **/
    public static void beanToTxt(String filePath, List<ColumnBean> listStr) {
        try{
            BufferedWriter writer = new BufferedWriter(new FileWriter(new File(filePath),true));
            listStr.forEach(str ->{
                try {
                        writer.newLine();
                        writer.write(str.toString());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            });
            writer.close();
        }catch(Exception e){
            e.printStackTrace();
        }
        System.out.println("檔案寫入完畢,檔案路徑:"+filePath);
    }
    /**
     * @Author wuxw
     * @Description 根據檔案路徑讀取檔案內容
     * @Date 17:10 2019/3/22
     * @Param [file]
     * @return java.util.List<java.lang.String>
     **/
    public static List<String> readTextFile(String file){
        //讀取檔案
        List<String> lineLists = null;
        try{
            lineLists = Files.lines(Paths.get(file), Charset.defaultCharset())
                    .flatMap(line -> Arrays.stream(line.split("\n")))
                    .collect(Collectors.toList());
        } catch (IOException e) {
            //Your exception handling here
        }
        return lineLists;
    }
}
 

 

/**
 * @author ：wuxw
 * @ClassName : ColumnBean
 * @description： TODO
 * @date ：2019/3/22 15:12
 * @version: 1.0
 */
@Data
public class ColumnBean {
    private String code;
    private String ctype;
    private String isEmpty;
    private String commont;
    private String note;

    public String toString(){
        return code+" "+ctype+" "+isEmpty+" "+commont+" "+note;
    }
}
 

效果

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