使用Java打印字符串表格(中英文内容不乱)

 

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。

这个工具满足一下使用要求:

  • 可以设置标题
  • 可以设置表格中数据的左右边距
  • 可以设置表格由什么符号组成
  • 可以设置表格数据最大长度

代码如下:

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;
    }
}

  

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;
    }
}

  

使用例子:

 @Test
 public 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
 }

  

输出结果:

*****************************
*  name     *  age  *  sex  *
*****************************
*  王麻345  *  21   *  男2  *
*****************************
*  wzeef    *  21   *  男   *
*****************************

原文地址:https://www.cnblogs.com/hebaibai/p/10710491.html
个人站地址:https://www.hebaibai.com/?p=371
posted @ 2019-04-15 14:33  何白白  阅读(1279)  评论(0编辑  收藏