恢复微信模块，优化知识库切片功能

ruoyi-modules-api/ruoyi-knowledge-api/src/main/java/org/ruoyi/chain/split/ExcelTextSplitter.java

@@ -1,17 +1,59 @@
 package org.ruoyi.chain.split;
 
+import jakarta.annotation.Resource;
 import lombok.AllArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
+import org.ruoyi.common.core.utils.StringUtils;
+import org.ruoyi.domain.vo.KnowledgeInfoVo;
+import org.ruoyi.service.IKnowledgeInfoService;
+import org.springframework.context.annotation.Lazy;
 import org.springframework.stereotype.Component;
 
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 @Component
 @AllArgsConstructor
 @Slf4j
 public class ExcelTextSplitter implements TextSplitter{
+
+
     @Override
     public List<String> split(String content, String kid) {
-        return null;
+        // 使用默认配置
+        String knowledgeSeparator = "#";
+        int textBlockSize = 10000;
+        int overlapChar = 500;
+        List<String> chunkList = new ArrayList<>();
+        if (content.contains(knowledgeSeparator) && StringUtils.isNotBlank(knowledgeSeparator)) {
+            // 按自定义分隔符切分
+            String[] chunks = content.split(knowledgeSeparator);
+            chunkList.addAll(Arrays.asList(chunks));
+        } else {
+            int indexMin = 0;
+            int len = content.length();
+            int i = 0;
+            int right = 0;
+            while (true) {
+                if (len > right) {
+                    int begin = i * textBlockSize - overlapChar;
+                    if (begin < indexMin) {
+                        begin = indexMin;
+                    }
+                    int end = textBlockSize * (i + 1) + overlapChar;
+                    if (end > len) {
+                        end = len;
+                    }
+                    String chunk = content.substring(begin, end);
+                    chunkList.add(chunk);
+                    i++;
+                    right = right + textBlockSize;
+                } else {
+                    break;
+                }
+            }
+        }
+        return chunkList;
     }
 }