[开发测试]java获取市级顺序字符串

因公司业务需要，只显示市级别的城市按首字母顺序排列

首先解析汉字

1、引入jar包

<dependency>
    <groupId>com.belerweb</groupId>
    <artifactId>pinyin4j</artifactId>
    <version>2.5.0</version>
</dependency>

2、编写utils

@Slf4j
public class PinYinUtils {

    /**
     * 获取第一个汉字首字母
     *
     * @author liu
     */
    public static String getFirst(String str) {
        if(StringUtils.isEmpty(str)){
            return null;
        }
        char[] charArray = str.toCharArray();
        HanyuPinyinOutputFormat defaultFormat = new HanyuPinyinOutputFormat();
        defaultFormat.setCaseType(HanyuPinyinCaseType.UPPERCASE);//设置拼音大小写
        defaultFormat.setToneType(HanyuPinyinToneType.WITHOUT_TONE);//设置声调格式
        try {
            StringBuffer sb=new StringBuffer();
            for (char c:charArray){
                if(!Character.toString(c).matches("[\\u4E00-\\u9FA5]+")) {
                    continue;
                }
                String[] hanyuPinyinStringArray = PinyinHelper.toHanyuPinyinStringArray(c, defaultFormat);
                if(hanyuPinyinStringArray==null){
                    continue;
                }
                sb.append(hanyuPinyinStringArray[0].charAt(0));
            }
            return sb.toString();
        } catch (BadHanyuPinyinOutputFormatCombination badHanyuPinyinOutputFormatCombination) {
            log.error("拼音转换失败{}",badHanyuPinyinOutputFormatCombination);
            return null;
        }
    }
}

其次请求高德省市县接口

@RestController
@RequestMapping("/v1/cpsp")
public class CpspController {

    @PostMapping("/v1/getCity")
    public String getCity(){
    	//请求高德接口
        RestTemplate restTemplate=new RestTemplate();
        String url="https://restapi.amap.com/v3/config/district";
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
        MultiValueMap<String, String> params= new LinkedMultiValueMap<String, String>();
        params.add("subdistrict","2");
        params.add("key","xxxxxxxxx");
        HttpEntity<MultiValueMap<String, String>> httpEntity=new HttpEntity<MultiValueMap<String, String>>(params,headers);
        ResponseEntity<JSONObject> responseEntity=restTemplate.exchange(url, HttpMethod.POST,httpEntity,JSONObject.class);
        //解析高德返回数据
        JSONObject jsonObject=responseEntity.getBody();
        JSONArray country=jsonObject.getJSONArray("districts");
        JSONArray provinces=country.getJSONObject(0).getJSONArray("districts");
        Map<String,JSONObject> map=new TreeMap<>();
        for(int i=0;i<provinces.size();i++){
            JSONArray citys=provinces.getJSONObject(i).getJSONArray("districts");
            JSONObject jsonObjectCity=null;
            for(int c=0;c<citys.size();c++){
                JSONObject city=citys.getJSONObject(c);
                jsonObjectCity=new JSONObject();
                jsonObjectCity.put("adcode",city.getString("adcode"));
                jsonObjectCity.put("name",city.getString("name"));
                map.put(PinYinUtils.getFirst(city.getString("name")),jsonObjectCity);
            }
        }
        //对市级数据进行排序
        JSONObject resultJSONObject=new JSONObject();
        String first="A";
        List<JSONObject> list=new ArrayList<>();
        for (Map.Entry<String, JSONObject> entry : map.entrySet()) {
            if(first.equalsIgnoreCase(String.valueOf(entry.getKey().charAt(0)))){
                list.add(entry.getValue());
            }else{
                resultJSONObject.put(first,list);
                first=String.valueOf(entry.getKey().charAt(0));
                list=new ArrayList<>();
                list.add(entry.getValue());
            }
        }
        resultJSONObject.put(first,list);
        return resultJSONObject.toJSONString();
    }
}

此代码有可优化空间，但是本人只是生成出来交给APP使用，故未做优化