简单的file获取文本内容且, 修改文本内容(java8)

清疚 2022-01-14 23:21 544阅读 0赞

[2019独角兽企业重金招聘Python工程师标准>>> ][2019_Python_] ![hot3.png][]

题主, 因入职新公司, 表设计混乱, 不得不手动写一个小脚本,获取所有字段后,重新写入至新表中;

# 思路 #

顺序如下

![f5094b9cdfe2e2328193c50d2ebcc0066a7.jpg][]

原sql

具体, 获取行 , 根据行开头的" ,"截取内容, 重新输入到txt, 中就可以了;

![1a0cafc3613ae8838eb4a50881d5b7f839f.jpg][]

# 代码 #

这里就写下 java8 的如何读取和写入吧

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);
            // 将每行内容分割 最后输出到文本
            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 行内容版 - 将字符串内容写入文本
         * @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("文件写入完毕,文件路径:"+filePath);
        }
        /**
         * @Author wuxw
         * @Description 数组循环写入文本
         * @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("文件写入完毕,文件路径:"+filePath);
        }
        /**
         * @Author wuxw
         * @Description bean转成行输出至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("文件写入完毕,文件路径:"+filePath);
        }
        /**
         * @Author wuxw
         * @Description 根据文件路径读取文件内容
         * @Date 17:10 2019/3/22
         * @Param [file]
         * @return java.util.List<java.lang.String>
         **/
        public static List<String> readTextFile(String file){
            //读取文件
            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 #

![253c511b9dd6d7131ac8072a7b3434403e2.jpg][]

转载于:https://my.oschina.net/java1314/blog/3026435

[2019_Python_]: https://my.oschina.net/u/2663968/blog/3061697
[hot3.png]: /images/20220114/9a90d83d153741b3a685408c23481be2.png
[f5094b9cdfe2e2328193c50d2ebcc0066a7.jpg]: /images/20220114/0e8128f7b7a34dad93cfcb9b4ce53e3d.png
[1a0cafc3613ae8838eb4a50881d5b7f839f.jpg]: /images/20220114/0dcfff99043c4b77a0d3e0fba8685f5f.png
[253c511b9dd6d7131ac8072a7b3434403e2.jpg]: /images/20220114/765cb9f8a97f4b94b0c6a2a01d27661e.png