增加分段预览功能，在知识库查看文件，可以看到其分段内容与信息

chat-client/src/api/Segment.ts

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+import request from '@/utils/request'
+
+export function getSegmentList(params: { datasetId: string; documentId: string }) {
+  return request({
+    url: '/brichat-service/documentSegment/selectSegments',
+    method: 'get',
+    params,
+  })
+}

chat-server/src/main/java/com/bjtds/brichat/controller/DocumentSegmentController.java

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+package com.bjtds.brichat.controller;
+
+import com.bjtds.brichat.entity.dto.SegmentDto;
+import com.bjtds.brichat.service.dify.DocumentSegmentService;
+import com.bjtds.brichat.util.ResultUtils;
+import lombok.extern.slf4j.Slf4j;
+import org.checkerframework.checker.units.qual.C;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.Comparator;
+import java.util.List;
+
+@RestController
+@Slf4j
+@CrossOrigin(value = "*", maxAge = 3600)
+@RequestMapping("/documentSegment")
+public class DocumentSegmentController {
+    @Autowired
+    private DocumentSegmentService documentSegmentService;
+
+    @GetMapping("/selectSegments")
+    public ResultUtils SelectSegments(@RequestParam("documentId") String documentId, @RequestParam("datasetId") String datasetId) {
+        List<SegmentDto> segments = documentSegmentService.SelectSegments(documentId, datasetId);
+        segments.sort(Comparator.comparing(SegmentDto::getPosition));
+        return ResultUtils.success(segments);
+    }
+}

chat-server/src/main/java/com/bjtds/brichat/mapper/postgresql/DifyDocumentSegmentMapper.java

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+package com.bjtds.brichat.mapper.postgresql;
+
+
+import com.bjtds.brichat.entity.dto.SegmentDto;
+import org.apache.ibatis.annotations.Mapper;
+
+import java.util.List;
+
+@Mapper
+public interface DifyDocumentSegmentMapper {
+
+    List<SegmentDto> SelectSegmentsByDocumentIdAndDatasetId(String documentId, String datasetId);
+}

chat-server/src/main/java/com/bjtds/brichat/service/dify/DocumentSegmentService.java

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+package com.bjtds.brichat.service.dify;
+
+import com.bjtds.brichat.entity.dto.SegmentDto;
+
+import java.util.List;
+
+public interface DocumentSegmentService {
+
+    List<SegmentDto> SelectSegments(String documentId, String datasetId);
+}

chat-server/src/main/java/com/bjtds/brichat/service/dify/impl/DocumentSegmentServiceImpl.java

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+package com.bjtds.brichat.service.dify.impl;
+
+import com.bjtds.brichat.entity.dto.SegmentDto;
+import com.bjtds.brichat.mapper.postgresql.DifyDocumentSegmentMapper;
+import com.bjtds.brichat.service.dify.DocumentSegmentService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.Collections;
+import java.util.List;
+
+@Service
+public class DocumentSegmentServiceImpl implements DocumentSegmentService {
+
+    @Autowired
+    private DifyDocumentSegmentMapper difyDocumentSegmentMapper;
+
+    @Override
+    public List<SegmentDto> SelectSegments(String documentId, String datasetId) {
+        return difyDocumentSegmentMapper.SelectSegmentsByDocumentIdAndDatasetId(documentId, datasetId);
+    }
+}

chat-server/src/main/resources/com/bjtds/brichat/mapper/postgresql/DifyDocumentSegmentMapper.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.bjtds.brichat.mapper.postgresql.DifyDocumentSegmentMapper">
+    <select id="SelectSegmentsByDocumentIdAndDatasetId" resultType="com.bjtds.brichat.entity.dto.SegmentDto">
+        select *
+        from document_segments
+                 where
+                <if test="documentId != null">
+                    document_id = CAST(#{documentId} as uuid) and
+                </if>
+                 <if test="datasetId != null">
+                        dataset_id = CAST(#{datasetId} as uuid)
+                 </if>
+    </select>
+</mapper>