One 、RestAPI Realize automatic completion query （ Code explanation ）

Code ：

    @Autowired
    private RestHighLevelClient client;


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

        //4. Analysis results 
        Suggest suggest = response.getSuggest();
        //4.1  Complete the query name according to , Get more complete results 
        CompletionSuggestion suggestions = suggest.getSuggestion("suggestions");
        //4,2  obtain options
        List<CompletionSuggestion.Entry.Option> options = suggestions.getOptions();
        //4.3  Traverse 
        for( CompletionSuggestion.Entry.Option option : options){
            String text = option.getText().toString();
            System.out.println(text);
        }

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

among ：

 @Autowired
    private RestHighLevelClient client;

We should inject bean in

Two 、 The following is the case of dark horse tourism network to realize the automatic completion function ：

At the beginning of the , Input x, Can't automatically complete

RestAPI Realize automatic completion ：

  （1） stay controller Layer write interface

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

 （2） stay service Layer written

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

            //4. Analysis results 
            Suggest suggest = response.getSuggest();
            //4.1  Complete the query name according to , Get more complete results 
            CompletionSuggestion suggestions = suggest.getSuggestion("suggestions");
            //4,2  obtain options
            List<CompletionSuggestion.Entry.Option> options = suggestions.getOptions();
            //4.3  Traverse 
            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) Restart project

Then you can complete it automatically