Java的新项目学成在线笔记-day15（六）

2.3.4 启动logstash.bat
启动logstash.bat采集teachplan_media_pub中的数据，向ES写入索引。

[mw_shl_code=applescript,true]logstash.bat ‐f ../config/mysql_course_media.conf
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2.4 搜索服务查询课程媒资接口
2.4.1 需求分析
搜索服务提供查询课程媒资接口，此接口供学习服务调用。 2.4.2 Api
在课程搜索包下定义Api

[mw_shl_code=applescript,true]@ApiOperation("根据课程计划查询媒资信息")
public TeachplanMediaPub getmedia(String teachplanId);[/mw_shl_code]

2.4.3 Service
1、配置课程计划媒资索引库等信息
在application.yml中配置

[mw_shl_code=applescript,true]xuecheng:  
elasticsearch:   
  media:   
    index: xc_course_media  
     type: doc   
   source_field: courseid,media_id,media_url,teachplan_id,media_fileoriginalname[/mw_shl_code]

2、service方法开发 在课程搜索服务中定义课程媒资查询接口，为了适应后续需求，service参数定义为数组，可一次查询多个课程计划 的媒资信息。

[mw_shl_code=applescript,true]//根据课程计划查询媒资信息 public QueryResponseResult getmedia(String[] teachplanIds){     //设置索引     SearchRequest searchRequest = new SearchRequest(media_index);    
//设置类型     searchRequest.types(media_type);   
  SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();   
  //source源字段过虑  
   String[] source_fields = media_source_field.split(","); 
    searchSourceBuilder.fetchSource(source_fields, new String[]{}); 
    //查询条件，根据课程计划id查询(可传入多个id)   
  searchSourceBuilder.query(QueryBuilders.termsQuery("teachplan_id", teachplanIds));     searchRequest.source(searchSourceBuilder);     SearchResponse searchResponse = null;  
   try {      
   //执行搜索
searchResponse = restHighLevelClient.search(searchRequest);  
   } catch (IOException e) {   
      e.printStackTrace(); 
    }   
  //获取搜索结果   
  SearchHits hits = searchResponse.getHits();   
  SearchHit[] searchHits = hits.getHits();  
   Map map = new HashMap<>();   
  //数据列表     List teachplanMediaPubList = new ArrayList<>();   
  for (SearchHit hit : searchHits) {    
     TeachplanMediaPub teachplanMediaPub  =new TeachplanMediaPub();   
      Map sourceAsMap = hit.getSourceAsMap();     
    //取出课程计划媒资信息      
   String courseid = (String) sourceAsMap.get("courseid");     
   String media_id = (String) sourceAsMap.get("media_id");   
      String media_url = (String) sourceAsMap.get("media_url");   
      String teachplan_id = (String) sourceAsMap.get("teachplan_id");  
       String media_fileoriginalname = (String) sourceAsMap.get("media_fileoriginalname");    
       teachplanMediaPub.setCourseId(courseid);      
   teachplanMediaPub.setMediaUrl(media_url);     
    teachplanMediaPub.setMediaFileOriginalName(media_fileoriginalname);     
    teachplanMediaPub.setMediaId(media_id);      
   teachplanMediaPub.setTeachplanId(teachplan_id);      
     //将数据加入列表      
   teachplanMediaPubList.add(teachplanMediaPub); 
    }    
   //构建返回课程媒资信息对象  
   QueryResult queryResult = new QueryResult<>();  
   queryResult.setList(teachplanMediaPubList);   
  QueryResponseResult queryResponseResult = new 
QueryResponseResult(CommonCode.SUCCESS,queryResult);   
  return queryResponseResult;   }
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2.4.4 Controller

[mw_shl_code=applescript,true] 
        searchResponse = restHighLevelClient.search(searchRequest);   
  } catch (IOException e) {  
       e.printStackTrace();  
   }   
  //获取搜索结果  
   SearchHits hits = searchResponse.getHits();  
   SearchHit[] searchHits = hits.getHits();  
   Map map = new HashMap<>();   
  //数据列表   
  List teachplanMediaPubList = new ArrayList<>();   
  for (SearchHit hit : searchHits) {   
      TeachplanMediaPub teachplanMediaPub  =new TeachplanMediaPub();    
     Map sourceAsMap = hit.getSourceAsMap();   
      //取出课程计划媒资信息     
    String courseid = (String) sourceAsMap.get("courseid");   
      String media_id = (String) sourceAsMap.get("media_id");    
     String media_url = (String) sourceAsMap.get("media_url");   
      String teachplan_id = (String) sourceAsMap.get("teachplan_id");    
     String media_fileoriginalname = (String) sourceAsMap.get("media_fileoriginalname");   
        teachplanMediaPub.setCourseId(courseid);     
    teachplanMediaPub.setMediaUrl(media_url);     
    teachplanMediaPub.setMediaFileOriginalName(media_fileoriginalname);  
       teachplanMediaPub.setMediaId(media_id);  
       teachplanMediaPub.setTeachplanId(teachplan_id);     
      //将数据加入列表    
     teachplanMediaPubList.add(teachplanMediaPub); 
    }   
    //构建返回课程媒资信息对象    
QueryResult queryResult = new QueryResult<>(); 
    queryResult.setList(teachplanMediaPubList);     
QueryResponseResult
queryResponseResult = new 
QueryResponseResult(CommonCode.SUCCESS,queryResult);   
  return queryResponseResult; 
  }
@Override @GetMapping(value="/getmedia/{teachplanId}") public TeachplanMediaPub getmedia(@PathVariable("teachplanId") String teachplanId) {   
  //将课程计划id放在数组中，为调用service作准备   
  String[] teachplanIds = new String[]{teachplanId};    
//通过service查询ES获取课程媒资信息   
  QueryResponseResult mediaPubQueryResponseResult =  esCourseService.getmedia(teachplanIds);    
QueryResult queryResult = mediaPubQueryResponseResult.getQueryResult();  
   if(queryResult!=null
&& queryResult.getList()!=null         
    && queryResult.getList().size()>0){   
      //返回课程计划对应课程媒资  
       return queryResult.getList().get(0);
     }     
return new TeachplanMediaPub(); }
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2.4.5 测试
使用swagger-ui和postman测试课程媒资查询接口。