先展示效果

为什么写

最近在学习使用java来编写cli应用，但是在信息展示上碰到了难题。原因是没有很好工具来展示一个由字符串组成的表格。在git上搜到阿里巴巴有一个叫做 text-ui 的开源项目可以用，但是这个工具在制作表格的时候如果表格内容是中英文混合的，表格就会乱掉。于是就自己写了一个工具类来打印一个字符串组成的表格

贴代码 TextForm

package com.hebaibai.ascmd.text;import org.apache.commons.lang3.StringUtils;import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;public class TextForm {/*** 左边距*/protected int paddingL = 1;/*** 右边距*/protected int paddingR = 1;/*** 标题*/protected List<String> title = new ArrayList<>();/*** 数据*/protected List<List<String>> datas = new ArrayList<>();/*** 最大列数*/protected int maxCol = 0;/*** 每个单元格最大字符数*/protected int colMaxLength = 8;/*** 表格组成符号*/protected char separator = '.';private TextForm() {}public static TextFormBulider bulider() {return new TextFormBulider(new TextForm());}/*** 格式化输出表格*/public void printFormat() {List<List<String>> formData = new ArrayList<>();formData.add(title);formData.addAll(datas);Map<Integer, Integer> colMaxLengthMap = colMaxLength(formData);for (int i = 0; i < formData.size(); i++) {List<String> row = formData.get(i);for (int j = 0; j < row.size(); j++) {Formatter formatter = new Formatter();String str = row.get(j);if (str.length() > colMaxLength) {str = str.substring(0, colMaxLength);}int chineseNum = getChineseNum(str);Integer maxLength = colMaxLengthMap.get(j);String val = formatter.format("%-" + (maxLength - chineseNum) + "s", str).toString();row.set(j, val);}}Map<Integer, Integer> colMinBlankLengthMap = colMinBlankLength(formData);for (int i = 0; i < formData.size(); i++) {List<String> row = formData.get(i);for (int j = 0; j < row.size(); j++) {String val = row.get(j);Integer minBlankLength = colMinBlankLengthMap.get(j);val = val.substring(0, val.length() - minBlankLength);row.set(j, val);}}String line = "";List<String> rows = new ArrayList<>();for (List<String> strings : formData) {String pL = StringUtils.repeat(" ", paddingL);String pR = StringUtils.repeat(" ", paddingR);String row = separator + pL + String.join(pL + separator + pR, strings) + pR + separator;if (line.length() < row.length()) {line = StringUtils.repeat(separator, row.length());}rows.add(row);}System.out.println(line);for (String row : rows) {System.out.println(row);System.out.println(line);}}/*** 找到每一列最大的长度** @param formData* @return*/private Map<Integer, Integer> colMaxLength(List<List<String>> formData) {Map<Integer, Integer> map = new HashMap<>();for (int i = 0; i < formData.size(); i++) {int col = 0;List<String> strings = formData.get(i);while (strings.size() > col) {String val = strings.get(col);if (val.length() > colMaxLength) {val = val.substring(0, colMaxLength);strings.set(col, val);}int length = val.getBytes().length;Integer integer = map.get(col);if (integer == null) {map.put(col, length);} else {if (integer < length) {map.put(col, length);}}col++;}}return map;}/*** 找到每一列从右开始最小的空格长度** @param formData* @return*/private Map<Integer, Integer> colMinBlankLength(List<List<String>> formData) {Map<Integer, Integer> map = new HashMap<>();for (int i = 0; i < formData.size(); i++) {int col = 0;List<String> strings = formData.get(i);while (strings.size() > col) {String val = strings.get(col);int length = 0;for (int i1 = val.length() - 1; i1 >= 0; i1--) {if (val.charAt(i1) == ' ') {length++;} else {break;}}Integer integer = map.get(col);if (integer == null) {map.put(col, length);} else {if (integer > length) {map.put(col, length);}}col++;}}return map;}/*** 获取中文数量** @param val* @return*/private int getChineseNum(String val) {if (val == null) {val = "null";}String regex = "[\u4e00-\u9fa5|。|，]";ArrayList<String> list = new ArrayList<String>();Pattern pattern = Pattern.compile(regex);Matcher matcher = pattern.matcher(val);while (matcher.find()) {list.add(matcher.group());}int size = list.size();return size;}}复制代码

贴代码 TextFormBulider

package com.hebaibai.ascmd.text;import java.util.ArrayList;
import java.util.List;public class TextFormBulider {private TextForm textForm;protected TextFormBulider(TextForm textForm) {this.textForm = textForm;}public TextFormBulider title(String... titles) {if (textForm.maxCol < titles.length) {textForm.maxCol = titles.length;}for (String title : titles) {if (title == null) {title = "null";}textForm.title.add(title);}return this;}public TextFormBulider paddingL(int paddingL) {textForm.paddingL = paddingL;return this;}public TextFormBulider paddingR(int paddingR) {textForm.paddingR = paddingR;return this;}public TextFormBulider separator(char separator) {textForm.separator = separator;return this;}public TextFormBulider colMaxLength(int colMaxLength) {textForm.colMaxLength = colMaxLength;return this;}public TextFormBulider addRow(String... cols) {if (textForm.maxCol < cols.length) {textForm.maxCol = cols.length;}List<String> list = new ArrayList<>(cols.length);for (String col : cols) {if (col == null) {col = "null";}list.add(col);}textForm.datas.add(list);return this;}public TextForm finish() {int titleSize = textForm.title.size();if (titleSize < textForm.maxCol) {for (int i = 0; i < textForm.maxCol - titleSize; i++) {textForm.title.add(null);}}for (List<String> data : textForm.datas) {int dataSize = data.size();if (dataSize < textForm.maxCol) {for (int i = 0; i < textForm.maxCol - dataSize; i++) {data.add(null);}}}return textForm;}}
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测试代码

package com.hebaibai.ascmd.text;import org.junit.Test;import static org.junit.Assert.*;public class TextFormTest {@Testpublic void printFormat() {TextForm.bulider().title("name", "age", "sex")//设置标题.addRow("王麻345子", "21", "男2")//添加行.addRow("wzeefgrerhei", "21", "男")//添加行.colMaxLength(5)//设置单元格最大数据长度.separator('*')//设置表格由什么符号构成.paddingR(2)//右边距.paddingL(2)//左边距.finish()//完成.printFormat();//打印}
}
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原文链接 ：www.hebaibai.com/?p=371