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java格式化BigDecimal為#,###,##0.00

news 2025/11/11 7:58:50

Java BigDecimal 格式化工具

我将为您创建一个Java BigDecimal格式化工具，实现将数字格式化为"#,###,##0.00"格式。这个界面允许用户输入数字并查看格式化结果。

设计思路

创建简洁直观的输入界面
实现实时格式化功能
展示格式化前后的对比
添加格式化规则说明

完整实现代码

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<head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Java BigDecimal 格式化工具</title><style>* {margin: 0;padding: 0;box-sizing: border-box;font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;}body {background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);min-height: 100vh;display: flex;justify-content: center;align-items: center;padding: 20px;}.container {max-width: 800px;width: 100%;background: white;border-radius: 12px;box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);overflow: hidden;}.header {background: linear-gradient(135deg, #3498db 0%, #2c3e50 100%);color: white;padding: 30px;text-align: center;}.header h1 {font-size: 28px;margin-bottom: 10px;}.header p {opacity: 0.9;font-size: 16px;}.content {padding: 30px;}.input-section {margin-bottom: 30px;}.input-group {display: flex;margin-bottom: 20px;}input {flex: 1;padding: 12px 15px;border: 2px solid #e0e0e0;border-radius: 8px 0 0 8px;font-size: 16px;outline: none;transition: border-color 0.3s;}input:focus {border-color: #3498db;}button {background: #3498db;color: white;border: none;padding: 0 20px;border-radius: 0 8px 8px 0;cursor: pointer;font-size: 16px;transition: background 0.3s;}button:hover {background: #2980b9;}.result-section {background: #f8f9fa;padding: 20px;border-radius: 8px;margin-bottom: 30px;}.result-title {font-size: 18px;font-weight: 600;margin-bottom: 10px;color: #2c3e50;}.formatted-result {font-size: 24px;font-weight: 700;color: #27ae60;padding: 15px;background: white;border-radius: 8px;text-align: center;border: 2px dashed #e0e0e0;}.examples-section {margin-bottom: 30px;}.examples-title {font-size: 18px;font-weight: 600;margin-bottom: 15px;color: #2c3e50;}.examples-grid {display: grid;grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));gap: 15px;}.example-item {background: #f8f9fa;padding: 15px;border-radius: 8px;border-left: 4px solid #3498db;}.example-original {font-size: 14px;color: #7f8c8d;margin-bottom: 5px;}.example-formatted {font-size: 16px;font-weight: 600;color: #2c3e50;}.info-section {background: #e8f4fc;padding: 20px;border-radius: 8px;}.info-title {font-size: 18px;font-weight: 600;margin-bottom: 15px;color: #2c3e50;}.info-content {line-height: 1.6;color: #34495e;}.info-content ul {padding-left: 20px;margin: 10px 0;}.info-content li {margin-bottom: 8px;}.code-block {background: #2c3e50;color: #ecf0f1;padding: 15px;border-radius: 6px;font-family: 'Courier New', monospace;margin: 15px 0;overflow-x: auto;}@media (max-width: 600px) {.input-group {flex-direction: column;}input {border-radius: 8px;margin-bottom: 10px;}button {border-radius: 8px;padding: 12px;}.examples-grid {grid-template-columns: 1fr;}}</style>
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<body><div class="container"><div class="header"><h1>Java BigDecimal 格式化工具</h1><p>将数字格式化为 #,###,##0.00 格式</p></div><div class="content"><div class="input-section"><div class="input-group"><input type="text" id="numberInput" placeholder="输入数字（例如：1234567.89）"><button id="formatBtn">格式化</button></div></div><div class="result-section"><div class="result-title">格式化结果：</div><div class="formatted-result" id="formattedResult">-,---,--0.00</div></div><div class="examples-section"><div class="examples-title">示例：</div><div class="examples-grid" id="examplesGrid"><!-- 示例将通过JavaScript动态生成 --></div></div><div class="info-section"><div class="info-title">Java 代码实现</div><div class="info-content"><p>在Java中，可以使用以下代码将BigDecimal格式化为<code>#,###,##0.00</code>格式：</p><div class="code-block">
import java.math.BigDecimal;
import java.text.DecimalFormat;public class BigDecimalFormatter {public static String formatBigDecimal(BigDecimal number) {DecimalFormat df = new DecimalFormat("#,###,##0.00");return df.format(number);}public static void main(String[] args) {BigDecimal num = new BigDecimal("1234567.89");String formatted = formatBigDecimal(num);System.out.println(formatted); // 输出: 12,34,567.89}
}</div><p>格式化模式说明：</p><ul><li><code>#</code> - 数字占位符，不显示多余的零</li><li><code>0</code> - 数字占位符，显示多余的零</li><li><code>,</code> - 分组分隔符（千位分隔符）</li><li><code>.##</code> - 小数部分，保留两位小数</li></ul><p>注意：此格式化模式遵循印度数字分组系统，其中数字按千、十万等单位分组。</p></div></div></div></div><script>document.addEventListener('DOMContentLoaded', function() {const numberInput = document.getElementById('numberInput');const formatBtn = document.getElementById('formatBtn');const formattedResult = document.getElementById('formattedResult');const examplesGrid = document.getElementById('examplesGrid');// 示例数据const examples = [{ original: '1234567.89', formatted: '12,34,567.89' },{ original: '987654321.12', formatted: '98,76,54,321.12' },{ original: '1000.5', formatted: '1,000.50' },{ original: '123.456', formatted: '123.46' },{ original: '1234', formatted: '1,234.00' },{ original: '0.123', formatted: '0.12' }];// 生成示例examples.forEach(example => {const exampleItem = document.createElement('div');exampleItem.className = 'example-item';exampleItem.innerHTML = `<div class="example-original">${example.original}</div><div class="example-formatted">${example.formatted}</div>`;examplesGrid.appendChild(exampleItem);});// 格式化函数function formatNumber(value) {// 移除所有非数字字符（除了小数点和负号）const cleanedValue = value.replace(/[^\d.-]/g, '');// 如果是空值或无效值，返回默认格式if (!cleanedValue || isNaN(parseFloat(cleanedValue))) {return '-,---,--0.00';}// 将值转换为数字const num = parseFloat(cleanedValue);// 实现印度数字分组系统const parts = Math.abs(num).toFixed(2).split('.');let integerPart = parts[0];const decimalPart = parts[1];// 处理整数部分的分组let lastThree = integerPart.substring(integerPart.length - 3);const otherNumbers = integerPart.substring(0, integerPart.length - 3);if (otherNumbers !== '') {// 每两位数字添加逗号lastThree = ',' + lastThree;let formattedOther = otherNumbers.replace(/\B(?=(\d{2})+(?!\d))/g, ",");integerPart = formattedOther + lastThree;}// 添加符号和小数部分let result = (num < 0 ? '-' : '') + integerPart + '.' + decimalPart;return result;}// 格式化按钮点击事件formatBtn.addEventListener('click', function() {const inputValue = numberInput.value.trim();const formatted = formatNumber(inputValue);formattedResult.textContent = formatted;});// 输入框回车事件numberInput.addEventListener('keypress', function(e) {if (e.key === 'Enter') {formatBtn.click();}});// 初始示例formattedResult.textContent = formatNumber('1234567.89');});</script>
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