99 lines
3.0 KiB
Java
99 lines
3.0 KiB
Java
package util;
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import org.jetbrains.annotations.Contract;
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import org.jetbrains.annotations.NotNull;
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import java.lang.reflect.Field;
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import java.util.Arrays;
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import java.util.Map;
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import java.util.Scanner;
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import java.util.StringJoiner;
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import java.util.concurrent.ConcurrentHashMap;
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public class Toolset {
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public static int option() {
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Scanner reader = new Scanner(System.in);
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int chose;
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//读取选项
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while (true) {
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if (reader.hasNextInt()) {
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chose = reader.nextInt();
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break;
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} else {
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System.out.println("你的输入有误，请重新输入~");
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}
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}
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return chose;
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}
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//shellUI格式化输出
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private static final Map<Class<?>, Field[]> CLASS_2_FIELD_NAME = new ConcurrentHashMap<>();
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/**
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* 将对象打印成表格
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*/
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@SafeVarargs
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public static <T> String table(Class<T> clazz, T... objs) throws IllegalAccessException {
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Field[] fields = safeGetRefCtx(clazz);
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if (fields.length == 0) {
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return "";
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}
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// 计算每一列
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int[] maxLens = new int[fields.length];
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for (int i = 0; i < fields.length; i++) {
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final int ti = i;
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// 取出当前字段中最长的长度
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maxLens[i] = Arrays.stream(objs)
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.map(item -> {
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try {
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return String.valueOf(fields[ti].get(item));
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} catch (IllegalAccessException e) {
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// pass
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}
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return "";
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})
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.mapToInt(String::length)
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.max()
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.orElse(0);
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}
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StringJoiner result = new StringJoiner("\n");
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for (T obj : objs) {
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// 竖线前后加一个空格分割
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StringJoiner sj = new StringJoiner(" | ");
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for (int i = 0; i < fields.length; i++) {
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sj.add(fields[i].getName() + ": " + padRight(String.valueOf(fields[i].get(obj)), maxLens[i]));
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}
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result.merge(sj);
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}
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return result.toString();
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}
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/**
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* 右侧补充字符
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*/
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@Contract(pure = true)
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private static @NotNull String padRight(@NotNull String origin, int length) {
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StringBuilder originBuilder = new StringBuilder(origin);
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while (originBuilder.length() < length) {
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originBuilder.append(' ');
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}
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origin = originBuilder.toString();
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return origin;
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}
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private static Field @NotNull [] safeGetRefCtx(Class<?> clazz) {
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Field[] fields = CLASS_2_FIELD_NAME.get(clazz);
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if (fields == null) {
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fields = clazz.getDeclaredFields();
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for (Field field : fields) {
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//打开私有访问
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field.setAccessible(true);
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}
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CLASS_2_FIELD_NAME.put(clazz, fields);
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}
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return fields;
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}
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}
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