其然乐衣

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RestAPI实现自动补全 & 案例实现（搜索框输入进行自动补全）

一、RestAPI实现自动补全查询（代码讲解）

代码：

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    @Autowired
    private RestHighLevelClient client;


    @Test
    void testSuggestion() throws IOException {
        //1.准备Request
        SearchRequest request = new SearchRequest("hotel");
        //2.准备DSL
        request.source().suggest(new SuggestBuilder().addSuggestion(
                "suggestions",
                SuggestBuilders.completionSuggestion("suggestion")
                        .prefix("hm")
                        .skipDuplicates(true)
                        .size(10)
        ));
        //3.发起请求
        SearchResponse response = client.search(request, RequestOptions.DEFAULT);

        //4.解析结果
        Suggest suggest = response.getSuggest();
        //4.1 根据补全查询名称，获取更全的结果
        CompletionSuggestion suggestions = suggest.getSuggestion("suggestions");
        //4,2 获取options
        List<CompletionSuggestion.Entry.Option> options = suggestions.getOptions();
        //4.3 遍历
        for( CompletionSuggestion.Entry.Option option : options){
            String text = option.getText().toString();
            System.out.println(text);
        }

//        System.out.println(response);
    }

其中：

@Autowired
private RestHighLevelClient client;

要在项目启动方法里面注入到bean里

二、以下进行黑马旅游网的案例实现自动补全功能：

开始时，输入x，不能自动补全

RestAPI实现自动补全：

（1）在controller层写好接口

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@GetMapping("suggestion")
    public List<String> getSuggestions(@RequestParam("key") String predix){
        return hotelService.getSuggestions(predix);
    }

（2）在service层写好

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@Override
   public List<String> getSuggestions(String predix) {
       try {
           //1.准备Request
           SearchRequest request = new SearchRequest("hotel");
           //2.准备DSL
           request.source().suggest(new SuggestBuilder().addSuggestion(
                   "suggestions",
                   SuggestBuilders.completionSuggestion("suggestion")
                           .prefix(predix)
                           .skipDuplicates(true)
                           .size(10)
           ));
           //3.发起请求
           SearchResponse response = client.search(request, RequestOptions.DEFAULT);

           //4.解析结果
           Suggest suggest = response.getSuggest();
           //4.1 根据补全查询名称，获取更全的结果
           CompletionSuggestion suggestions = suggest.getSuggestion("suggestions");
           //4,2 获取options
           List<CompletionSuggestion.Entry.Option> options = suggestions.getOptions();
           //4.3 遍历
           List<String> list = new ArrayList<String>(options.size());
           for( CompletionSuggestion.Entry.Option option : options){
               String text = option.getText().toString();
               System.out.println(text);
               list.add(text);
           }
           return list;
       } catch (IOException e) {
           throw  new RuntimeException();
       }
   }

(3)重新启动项目

便可以进行自动补全了