java代码自动对齐_java程序实现编写代码时变量名垂直对齐的风格

记录英语单词时&＃xff0c;想把英语和中文翻译分别对齐&＃xff0c;有些人写代码喜欢把变量按这种方式对齐。在网上没搜到相关方法&＃xff0c;于是自己试着写代码去实现&＃xff0c;原本以为很简单&＃xff0c;写的时候才发现有不少问题。先看效果&＃xff1a;

普通的

对齐前&＃xff1a;

对齐后&＃xff1a;

发挥点创意

对齐前&＃xff1a;

对齐后&＃xff1a;

实现

实现的思路比较简单&＃xff0c;读取文本文件&＃xff0c;按正则分割&＃xff0c;找出最长的部分&＃xff0c;补齐空格&＃xff0c;输出。

看起来相当简单&＃xff0c;花了一个多小时&＃xff0c;就写出来了&＃xff0c;马上运行&＃xff0c;发现输出一团糟&＃xff0c;去查看每个部分的字符数&＃xff0c;个数是一样的&＃xff0c;网上一搜&＃xff0c;原来跟字体有关系&＃xff0c;好吧&＃xff0c;那换个等宽的字体。换好字体后有些地方已经对齐了&＃xff0c;有些地方还是没对齐&＃xff0c;发现是中文的问题&＃xff0c;中文宽度与英文宽度不相同&＃xff0c;于是首先根据正则去判断字符是中文还是英文&＃xff0c;然后自己实现计算字符长度的方法&＃xff0c;在判断中文字符上折腾了许久&＃xff0c;因为标点符号等等都要考虑进去&＃xff0c;反正是来来回回试了好久&＃xff0c;对Unicode编码范围不熟悉&＃xff0c;没办法。终于&＃xff0c;好像都搞定了&＃xff0c;反复测试&＃xff0c;突然发现第一行的对齐少了一个空格&＃xff0c;尼玛&＃xff0c;这是怎么回事啊&＃xff0c;Debug发现第一行的最开始有一个奇怪的字符"\uFEFF"&＃xff0c;这他妈是什么鬼&＃xff0c;上网搜&＃xff0c;发现是Unicode编码的什么BOM头&＃xff0c;好吧&＃xff0c;不管它是什么鬼&＃xff0c;直接把它去掉了……

反正是遇到了各种各样的问题&＃xff0c;与字符集相关的问题实在是太头疼了。另外&＃xff0c;我没有去处理编码的问题&＃xff0c;所以文本的编码需要和IDE的编码保持一致&＃xff0c;否则就会产生乱码。

源码

看过《重构》和《代码整洁之道》之后&＃xff0c;写代码时时刻想着要写干净点&＃xff0c;扩展性强点&＃xff0c;经过反复修改&＃xff0c;最终自己觉得还行吧&＃xff0c;当然&＃xff0c;肯定有不少值得改进的地方&＃xff0c;现在就这样吧。

App.java

1 packagetextalign;2

3 importjava.io.IOException;4

5 /**

6 *&＃64;authortingl7 *&＃64;version2017/9/278 */

9 public classApp {10

11 public static voidmain(String[] args) {12 long start &＃61;System.currentTimeMillis();13

14 String filePath &＃61; "C:\\Users\\tingl\\Desktop\\Test2.txt";15 TextAlign textAlign &＃61; new TextAlign(/*"&＃xff0c;|。|,|[.]|( {2,})|\t|　&＃43;"*/);16

17 if (args.length > 0) {18 filePath &＃61; args[0];19 }20 try{21 textAlign.align(filePath);22 } catch(IOException e) {23 e.printStackTrace();24 }25

26 System.out.println(System.currentTimeMillis() -start);27 }28 }

TextAlign.java

1 packagetextalign;2

3 importjava.io.IOException;4 importjava.util.List;5 importjava.util.regex.Pattern;6

7 /**

8 *&＃64;authortingl9 *&＃64;version2017/9/2710 */

11 public classTextAlign {12 private static final String CHINESE_CHARACTER &＃61; "[\u4e00-\u9fa5]|[\uFE30-\uFFA0]|[\u3000-\u303F]";13 private static final Pattern CHINESE_CHARACTER_PATTERN &＃61;Pattern.compile(CHINESE_CHARACTER);14 private static final int SEPARATE_SPACE_AMOUNT &＃61; 4;15

16 privateTextAlignFileUtil textAlignFileUtil;17 private ListtextLines;18 private int[] longestBlockLengths;19

20 publicTextAlign() {21 textAlignFileUtil &＃61; newTextAlignFileUtil();22 }23

24 publicTextAlign(String spiltRegex) {25 textAlignFileUtil &＃61; newTextAlignFileUtil(spiltRegex);26 }27

28 public void align(String filePath) throwsIOException {29 textLines &＃61;textAlignFileUtil.readToList(filePath);30 initLongestBlockLengths();31 fillTextLinesBySpaces();32 textAlignFileUtil.write();33 }34

35 private voidinitLongestBlockLengths() {36 int longestArrayLength &＃61; 0;37 for(String[] blocks : textLines) {38 if (blocks.length >longestArrayLength) {39 longestArrayLength &＃61;blocks.length;40 }41 }42 longestBlockLengths &＃61; new int[longestArrayLength];43 fillLongestBlockLengths();44 }45

46 private voidfillLongestBlockLengths() {47 for(String[] blocks : textLines) {48 if (blocks.length <2) continue;49 for (int i &＃61; 0; i longestBlockLengths[i]) {52 longestBlockLengths[i] &＃61;length;53 }54 }55 }56 }57

58 private intstringLengthFitWidth(String s) {59 if (!CHINESE_CHARACTER_PATTERN.matcher(s).find()) {60 returns.length();61 }62 int length &＃61; 0;63 for (String c : s.split("")) {64 if(CHINESE_CHARACTER_PATTERN.matcher(c).find()) {65 length&＃43;&＃43;;66 }67 length&＃43;&＃43;;68 }69 returnlength;70 }71

72 private voidfillTextLinesBySpaces() {73 for(String[] blocks : textLines) {74 for (int i &＃61; 0; i

82 private String spaces(intspaceAmount) {83 StringBuilder spaces &＃61; newStringBuilder();84 for (int i &＃61; 0; i

TextAlignFileUtil.java

1 packagetextalign;2

3 import java.io.*;4 importjava.util.ArrayList;5 importjava.util.Arrays;6 importjava.util.List;7

8 /**

9 *&＃64;authortingl10 *&＃64;version2017/9/2711 */

12 classTextAlignFileUtil {13 private static final String FILENAME_POSTFIX &＃61; "_aligned";14 private String spiltRegex &＃61; "( {2,})|\t";15 private ListtextLines;16 privateString outPath;17

18 TextAlignFileUtil() {19 }20

21 TextAlignFileUtil(String spiltRegex) {22 this.spiltRegex &＃61;spiltRegex;23 }24

25 List readToList(String path) throwsIOException {26 File file &＃61; newFile(path);27 returnreadToList(file);28 }29

30 private List readToList(File file) throwsIOException {31 getOutPath(file.getAbsolutePath());32 try (BufferedReader reader &＃61; new BufferedReader(newFileReader(file))) {33 textLines &＃61; new ArrayList<>();34 String line;35 while ((line &＃61; reader.readLine()) !&＃61; null) {36 textLines.add(removeEmptyAndTrim(line.split(spiltRegex)));37 }38 }39 removeBomHead();40 returntextLines;41 }42

43 private voidgetOutPath(String srcPath) {44 int dotPosition &＃61; srcPath.lastIndexOf(".");45 outPath &＃61; srcPath.substring(0, dotPosition) &＃43; FILENAME_POSTFIX &＃43;srcPath.substring(dotPosition);46 if (newFile(outPath).exists()) {47 getOutPath(outPath);48 }49 }50

51 privateString[] removeEmptyAndTrim(String[] src) {52 for (int i &＃61; 0; i

56 List dest &＃61; new ArrayList<>(Arrays.asList(src));57 dest.removeIf(String::isEmpty);58 return dest.toArray(new String[0]);59 }60

61 private voidremoveBomHead() {62 String[] blocks &＃61; textLines.get(0);63 blocks[0] &＃61; blocks[0].replace("\uFEFF", "");64 }65

66 void write() throwsIOException {67 try (BufferedWriter writer &＃61; new BufferedWriter(newFileWriter(outPath))) {68 for(String[] blocks : textLines) {69 writer.write(getLine(blocks));70 writer.newLine();71 writer.flush();72 }73 }74 }75

76 privateString getLine(String[] blocks) {77 StringBuilder sb &＃61; newStringBuilder();78 for(String block : blocks) {79 sb.append(block);80 }81 returnsb.toString();82 }83 }