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PDF-OCR文件识别篇(五):字段定义与提示词工程

PDF-OCR文件识别篇(五):字段定义与提示词工程

抽取质量的关键不在「怎么调模型」,而在「怎么跟模型说话」。本模块用系统提示词 + 按表注入字段定义两段式,把通用大模型驯成针对你这套表格的专业抽取器。

5.1 系统提示词 SYSTEM_PROMPT

定义在 AiPdfExtractionServiceImpl,固化了 7 条抽取铁律。这是所有表共用的「底座规则」:

  1. 逐字保留
    :严格按原文抽取,禁止概括、改写、缩写、翻译、合并、推测、补全;完整保留全部文字、数字、单位、括号与符号。
  2. 字段约束
    :若给了「字段清单」,columns 必须与之完全一致(同名、同序、不缺、不改名、不新增、不合并);每个 row 都要含全部字段,无内容填 ""
  3. 输出形态
    :键值型登记表 → JSON 对象;多行明细表 → {"columns":[...], "rows":[{列名:值,...}, ...]}
  4. 合并单元格向下填充
    :纵向合并的值属于它跨越的所有行,必须在每一行都重复填入,绝不能只在首行填、其余留空。
  5. 跨页折行合并
    :若某行只有个别单元格有少量文字、标识列(如序号、记录编号)为空,说明是上一行被折断的续接文字,合并回上一行,不单独成行。
  6. 去掉页眉页脚、页码(如「— 2 —」)、表格标题等无关内容。
  7. 只输出 JSON,不要任何解释或 markdown 代码块。

第 4、5 条最关键——它们直接对抗 PDF 表格最常见的两类结构破坏。配合第 4 章百度 OCR 识别出的结构化 JSON 作为输入:提示词约束 + 结构化输入,两头夹,才压得住。

提示词里的「领域身份」可按需替换。比如把开头设成「你是某某单据的结构化抽取专家」,能进一步收敛模型对该领域术语的理解,但 7 条铁律是通用的。

5.2 字段注册表 TableSchemaRegistry + table-schema.json

字段定义文件

resources/schema/table-schema.json 按「表格标题」定义每张表的结构示例:

"基本信息表": {  "title": "基本信息表",  "rootKey""基本信息",  "type""object",  "example": {    "单位名称": "示例科技有限公司",    "注册地址""某省某市某区某路1号",    "统一社会信用代码""9100000000000000XX",    "联系电话""010-00000000",    "证件文号列表": ["示字〔2021〕4号""..."],    "指标": {      "指标A": { "数值": 5588.22"单位""t/a""说明""..." }    }  }}

example 是一份「填好的样表」,直接示范字段名、嵌套层级、数据类型——比干巴巴列字段名更能约束模型输出。

注册表加载与匹配

TableSchemaRegistry 在 @PostConstruct 时加载,外部文件 schemaPath 优先,否则用 classpath 内置,按「去表号/空白」归一化后的标题建索引:

public TableSchema getByTitle(String title) {    TableSchema s = schemas.get(normalize(title));     // ① 精确匹配    if (s != nullreturn s;    for (entry : schemas)                              // ② 包含兜底        if (key.length() >= 4 && (norm.contains(key) || key.contains(norm)))            return entry.getValue();    return null;}// normalize: 去掉开头「表N / 表N-N」前缀与所有空白

为什么按标题而非表号匹配?因为同一类表在不同文档里表序号可能不同(这份里是表48,那份里可能是表46),标题更稳定。

外部文件优先还有个运维价值:不重启、不重新打包就能调字段定义,线上发现某表抽得不对,改 JSON 文件即可。

5.3 动态注入 buildSchemaBlock

抽取每张表时,把该表的字段定义拼进用户提示词。逻辑分三档:

TableSchema schema = tableSchemaRegistry.getByTitle(title);if (schema == nullreturn "";                         // ③ 未配置 → 自由抽取if (schema.getExample() != null) {                     // ① 有结构示例(首选)    // 数组型:要求输出 {"rootKey": [元素,…]},每个元素严格遵循示例    // 对象型:要求严格遵循结构示例    return "请输出 JSON 对象,严格遵循下面的「结构示例」…" + prettyJson(example);}if (schema.getFields() 非空) {                          // ② 只有字段清单    // 登记表:给「字段清单(对象键,不缺不改不增)」    // 明细表:给「columns 必须与字段完全一致」}

最终拼出的用户提示词大致是:

表格标题:表3 设备明细表请输出 JSON 对象,格式为 {"设备明细": [元素, ...]};数组每个元素严格遵循下面的「元素结构示例」…元素结构示例:"设备编号""...""设备名称""...""规格""...", ... }以下是该表百度 OCR 识别出的内容 JSON(跨页已合并),请严格据此抽取为结构化 JSON,逐行输出、不要遗漏任何一行……<OCR 识别结果 JSON>

5.4 这套提示工程为什么有效

手段
对抗的问题
系统提示词「逐字保留」
模型自作主张改写/缩写
系统提示词「合并填充 / 折行合并」
PDF 表格结构破坏
example
 结构示例
字段名漂移、层级随意、类型乱填
按标题匹配 + 外部文件优先
表号差异、线上免重启调整
强制 json_object + 低温(见第 6 章)
输出非 JSON、随机性过高

一句话:铁律定下限,结构示例定上限,对齐输入降难度。 三者缺一,抽取质量都会塌方。

基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-06-29 19:01:30 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/816543.html
  2. 运行时间 : 0.315666s [ 吞吐率:3.17req/s ] 内存消耗:4,803.69kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=1e4a41f143c372c19e41de030e09ba08
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  1. CONNECT:[ UseTime:0.001015s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001683s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.022578s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.005733s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001502s ]
  6. SELECT * FROM `set` [ RunTime:0.006563s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001543s ]
  8. SELECT * FROM `article` WHERE `id` = 816543 LIMIT 1 [ RunTime:0.001115s ]
  9. UPDATE `article` SET `lasttime` = 1782730890 WHERE `id` = 816543 [ RunTime:0.021312s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.001900s ]
  11. SELECT * FROM `article` WHERE `id` < 816543 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001914s ]
  12. SELECT * FROM `article` WHERE `id` > 816543 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001718s ]
  13. SELECT * FROM `article` WHERE `id` < 816543 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002084s ]
  14. SELECT * FROM `article` WHERE `id` < 816543 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.021697s ]
  15. SELECT * FROM `article` WHERE `id` < 816543 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006323s ]
0.319490s