为了减少用户工作量及误操作的可能性，需要实现用户上传PDF格式的发票，系统通过解析PDF文件获取发票内容，并直接将其写入表单。以下文章记录了功能实现的代码。
发票样式
发票内容解析
引用Maven
使用pdfbox
<dependency>
<groupId>org.apache.pdfbox</groupId>
<artifactId>pdfbox</artifactId>
<version>2.0.24</version> <!-- 请检查最新版本 -->
</dependency>
获取PDF内容
设置 sortByPosition 为 true 可以按文本位置提取内容，否则获取到的内容错乱，无法获取到真正需要的内容
@RequestMapping("uploadReceiptsTest")
@ResponseBody
public Map<String,String> uploadReceiptsTest() throws Exception{
String filePath = "D:/apache-tomcat-8.5.98/webapps/tspspic/发票文件/24372000000145100092.pdf"; // 保存路径
PDDocument document = PDDocument.load(new File(filePath));
PDFTextStripper pdfStripper = new PDFTextStripper();
// 排序文本行按其位置
pdfStripper.setSortByPosition(true);
String text = pdfStripper.getText(document);
document.close();
Map<String, String> map = pdfStr(text);
return map;
}
文本内容(部分内容以*替代)
public static void main(String[] args) {
String invoiceInfo = "电子发票（普通发票） 发票号码：******\n" +
"开票日期：******\n" +
"购 名称：****** 销 名称：******\n" +
"买 售\n" +
"方 方\n" +
"信 统一社会信用代码/纳税人识别号：****** 信 统一社会信用代码/纳税人识别号：******\n" +
"息 息\n" +
"项目名称 规格型号 单 位 数 量 单 价 金 额 税率/征收率 税 额\n" +
"******* 100ml：5g 袋 800 4.070796 3256.64 13% 423.36\n" +
"******\n" +
"合 计 ¥3256.64 ¥423.36\n" +
"价税合计（大写） 叁仟陆佰捌拾圆整 （小写）¥3680.00\n" +
"批号：******/ 生产日期：2024-05-15/ 有效期至:2026-04-30/ 含税单价：4.6000/ 生产厂家:******/ 批准文号:******/\n" +
"备 注\n" +
"开票人：王宁\n" +
"王宁";
解析文件内容，返回数据
初版测试
public Map<String,String> pdfStr(String invoiceInfo) {
//因解析出的括号不确定为中文还是英文，统一替换为英文字符
invoiceInfo = invoiceInfo.replaceAll("（","(").replaceAll("）",")");
// 定义正则表达式模式
Pattern patternInvoiceNumber = Pattern.compile("发票号码：(\\d+)");
Pattern patternInvoiceDate = Pattern.compile("开票日期：(\\d{4}年\\d{1,2}月\\d{1,2}日)");
Pattern patternBuyerName = Pattern.compile("购 名称：(.+?) 销 名称：(.+?)\n");
//由上图可以发现“项目名称 规格型号 单 位 数 量 单 价 金 额 税率/征收率 税 额”所需要的内容在下一行数据，使用笨方法直接获取“税额与合计”之间的数据通过之后的空格分割进行获取数据
Pattern patternItemDetails = Pattern.compile("税 额\\s+(.*?)合 计", Pattern.DOTALL);
Pattern patternTotal = Pattern.compile("\\(小写\\)¥(\\d+(\\.\\d+)?)");
Pattern patternBatchNumber = Pattern.compile("批号：(.+?)/");
Pattern patternProductionDate = Pattern.compile("生产日期：(\\d{4}-\\d{1,2}-\\d{1,2})/");
Pattern patternExpirationDate = Pattern.compile("有效期至:(\\d{4}-\\d{1,2}-\\d{1,2})/");
Pattern patternTaxIncludedPrice = Pattern.compile("含税单价：(\\d+(\\.\\d+)?)");
Pattern patternManufacturer = Pattern.compile("生产厂家:(.+?)/");
Pattern patternApprovalNumber = Pattern.compile("批准文号:(.+?)/");
Pattern patternIssuer = Pattern.compile("开票人：(.+)");
// 创建Matcher对象
Matcher matcherInvoiceNumber = patternInvoiceNumber.matcher(invoiceInfo);
Matcher matcherInvoiceDate = patternInvoiceDate.matcher(invoiceInfo);
Matcher matcherBuyerName = patternBuyerName.matcher(invoiceInfo);
Matcher matcherItemDetails = patternItemDetails.matcher(invoiceInfo);
Matcher matcherTotal = patternTotal.matcher(invoiceInfo);
Matcher matcherBatchNumber = patternBatchNumber.matcher(invoiceInfo);
Matcher matcherProductionDate = patternProductionDate.matcher(invoiceInfo);
Matcher matcherExpirationDate = patternExpirationDate.matcher(invoiceInfo);
Matcher matcherTaxIncludedPrice = patternTaxIncludedPrice.matcher(invoiceInfo);
Matcher matcherManufacturer = patternManufacturer.matcher(invoiceInfo);
Matcher matcherApprovalNumber = patternApprovalNumber.matcher(invoiceInfo);
Matcher matcherIssuer = patternIssuer.matcher(invoiceInfo);
// 提取数据
String invoiceNumber = "";
String invoiceDate = "";
String buyerName = "";
String sellerName = "";
String productName = "";
String specification = "";
String unit = "";
int quantity = 0;
double unitPrice = 0.0;
double amount = 0.0;
String taxRate = "";
double taxAmount = 0.0;
double total = 0.0;
String batchNumber = "";
String productionDate = "";
String expirationDate = "";
double taxIncludedPrice = 0.0;
String manufacturer = "";
String approvalNumber = "";
String issuer = "";
if (matcherInvoiceNumber.find()) {
invoiceNumber = matcherInvoiceNumber.group(1);
}
if (matcherInvoiceDate.find()) {
invoiceDate = matcherInvoiceDate.group(1);
}
if (matcherBuyerName.find()) {
buyerName = matcherBuyerName.group(1);
sellerName = matcherBuyerName.group(2);
}
// 处理项目名称、规格型号、单位、数量、单价、金额、税率/征收率、税额
if (matcherItemDetails.find()) {
String itemDetailsLine = matcherItemDetails.group(1).trim();
itemDetailsLine = itemDetailsLine.replace("\n"," ");
String[] details = itemDetailsLine.split(" "); // 按空格分割
if (details.length >= 8) { // 确保有足够的字段
//因部分名称过长，换行数据解析到最后进行拼接
productName = details[0].trim(); // 项目名称
if (details.length >= 9){
productName = details[0].trim()+details[8].trim(); // 项目名称
}
specification = details[1].trim(); // 规格型号
unit = details[2].trim(); // 单位
quantity = Integer.parseInt(details[3].trim()); // 数量
unitPrice = Double.parseDouble(details[4].trim()); // 单价
amount = Double.parseDouble(details[5].trim()); // 金额
taxRate = details[6].trim(); // 税率/征收率
taxAmount = Double.parseDouble(details[7].trim()); // 税额
System.out.println("项目名称: " + productName);
System.out.println("规格型号: " + specification);
System.out.println("单位: " + unit);
System.out.println("数量: " + quantity);
System.out.println("单价: " + unitPrice);
System.out.println("金额: " + amount);
System.out.println("税率/征收率: " + taxRate);
System.out.println("税额: " + taxAmount);
}
}
if (matcherTotal.find()) {
total = Double.parseDouble(matcherTotal.group(1));
}
if (matcherBatchNumber.find()) {
batchNumber = matcherBatchNumber.group(1);
}
if (matcherProductionDate.find()) {
productionDate = matcherProductionDate.group(1);
}
if (matcherExpirationDate.find()) {
expirationDate = matcherExpirationDate.group(1);
}
if (matcherTaxIncludedPrice.find()) {
taxIncludedPrice = Double.parseDouble(matcherTaxIncludedPrice.group(1));
}
if (matcherManufacturer.find()) {
manufacturer = matcherManufacturer.group(1);
}
if (matcherApprovalNumber.find()) {
approvalNumber = matcherApprovalNumber.group(1);
}
if (matcherIssuer.find()) {
issuer = matcherIssuer.group(1);
}
// 输出其他结果
System.out.println("发票号码: " + invoiceNumber);
System.out.println("开票日期: " + invoiceDate);
System.out.println("购买方名称: " + buyerName);
System.out.println("销售方名称: " + sellerName);
System.out.println("价税合计: " + total);
System.out.println("批号: " + batchNumber);
System.out.println("生产日期: " + productionDate);
System.out.println("有效期至: " + expirationDate);
System.out.println("含税单价: " + taxIncludedPrice);
System.out.println("生产厂家: " + manufacturer);
System.out.println("批准文号: " + approvalNumber);
System.out.println("开票人: " + issuer);
}
优化代码
-
Map存储正则表达式：将所有正则表达式模式和对应的字段名称存储在一个Map中，遍历Map并执行匹配，从而避免了为每个字段都写单独的匹配代码。
-
抽取通用逻辑：将匹配逻辑抽象成一个通用方法，简化了代码结构，减少了重复代码。
-
处理商品详情：在匹配完itemDetails后，再拆分字符串并填充对应的字段。
public static Map<String, String> pdfStr(String invoiceInfo) {
invoiceInfo = invoiceInfo.replaceAll("（", "(").replaceAll("）", ")");
// 定义正则表达式模式
Map<String, String> patterns = new HashMap<>();
patterns.put("invoiceNumber", "发票号码：(\\d+)");
patterns.put("invoiceDate", "开票日期：(\\d{4}年\\d{1,2}月\\d{1,2}日)");
patterns.put("buyerName", "购 名称：(.+?) 销 名称：(.+?)\n");
patterns.put("itemDetails", "税 额\\s+(.*?)合 计");
patterns.put("total", "\\(小写\\)¥(\\d+(\\.\\d+)?)");
patterns.put("batchNumber", "批号：(.+?)/");
patterns.put("productionDate", "生产日期：(\\d{4}-\\d{1,2}-\\d{1,2})/");
patterns.put("expirationDate", "有效期至:(\\d{4}-\\d{1,2}-\\d{1,2})/");
patterns.put("taxIncludedPrice", "含税单价：(\\d+(\\.\\d+)?)");
patterns.put("manufacturer", "生产厂家:(.+?)/");
patterns.put("approvalNumber", "批准文号:(.+?)/");
patterns.put("issuer", "开票人：(.+)");
// 提取数据
Map<String, String> result = new HashMap<>();
for (Map.Entry<String, String> entry : patterns.entrySet()) {
Pattern pattern = Pattern.compile(entry.getValue(), Pattern.DOTALL);
Matcher matcher = pattern.matcher(invoiceInfo);
if (matcher.find()) {
result.put(entry.getKey(), matcher.group(1).trim());
}
}
// 处理项目名称、规格型号、单位、数量、单价、金额、税率/征收率、税额
if (result.containsKey("itemDetails")) {
String[] details = result.get("itemDetails").replace("\n", " ").split(" ");
if (details.length >= 8) {
result.put("productName", details[0].trim() + (details.length > 8 ? details[8].trim() : ""));
result.put("specification", details[1].trim());
result.put("unit", details[2].trim());
result.put("quantity", details[3].trim());
result.put("unitPrice", details[4].trim());
result.put("amount", details[5].trim());
result.put("taxRate", details[6].trim());
result.put("taxAmount", details[7].trim());
}
}
// 打印结果
for (Map.Entry<String, String> entry : result.entrySet()) {
System.out.println(entry.getKey() + ": " + entry.getValue());
}
return result;
}
