@GetMapping(value = "/manualTrim")
    public void helloGet(String userName) {
        //手動(dòng)去空格
        userName = userName == null ? null : userName.trim();
        //或者通過谷歌工具類手動(dòng)去空格
         String trim = StringUtils.trim(userName);
    }

/**
 *  通過FilterRegistrationBean注冊自定義過濾器TrimFilter
 */
@Configuration
public class FilterConfig {
    /**
     * 注冊去除參數(shù)頭尾空格過濾器
     */
    @Bean
    public FilterRegistrationBean trimFilterRegistration() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setDispatcherTypes(DispatcherType.REQUEST);
        //注冊自定義過濾器
        registration.setFilter(new TrimFilter());
        //過濾所有路徑
        registration.addUrlPatterns("/*");
        //過濾器名稱
        registration.setName("trimFilter");
        //優(yōu)先級(jí)越低越優(yōu)先，這里說明最低優(yōu)先級(jí)
        registration.setOrder(FilterRegistrationBean.LOWEST_PRECEDENCE);
        return registration;
    }
}

/**
 *  自定義過濾器  通過繼承OncePerRequestFilter實(shí)現(xiàn)每次請求該過濾器只被執(zhí)行一次
 */
public class TrimFilter extends OncePerRequestFilter {
    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain)
            throws ServletException, IOException {
        //自定義TrimRequestWrapper，在這里實(shí)現(xiàn)參數(shù)去空
        TrimRequestWrapper requestWrapper = new TrimRequestWrapper(httpServletRequest);
        filterChain.doFilter(requestWrapper, httpServletResponse);
    }
}

/**
 * 自定義TrimRequestWrapper類
 */
@Slf4j
public class TrimRequestWrapper extends HttpServletRequestWrapper {
    /**
     * 保存處理后的參數(shù)
     */
    private Map<String, String[]> params = new HashMap<String, String[]>();
    public TrimRequestWrapper(HttpServletRequest request) {
        //將request交給父類，以便于調(diào)用對(duì)應(yīng)方法的時(shí)候，將其輸出
        super(request);
        //對(duì)于非json請求的參數(shù)進(jìn)行處理
        if (super.getHeader(HttpHeaders.CONTENT_TYPE) == null ||
                (!super.getHeader(HttpHeaders.CONTENT_TYPE).equalsIgnoreCase(MediaType.APPLICATION_JSON_VALUE) &&
                        !super.getHeader(HttpHeaders.CONTENT_TYPE).equalsIgnoreCase(MediaType.APPLICATION_JSON_UTF8_VALUE))) {
            setParams(request);
        }
    }
    private void setParams(HttpServletRequest request) {
        //將請求的的參數(shù)轉(zhuǎn)換為map集合
        Map<String, String[]> requestMap = request.getParameterMap();
        log.info("kv轉(zhuǎn)化前參數(shù)：" + JSON.toJSONString(requestMap));
        this.params.putAll(requestMap);
        //去空操作
        this.modifyParameterValues();
        log.info("kv轉(zhuǎn)化后參數(shù)：" + JSON.toJSONString(params));
    }
    /**
     * 將parameter的值去除空格后重寫回去
     */
    public void modifyParameterValues() {
        Set<String> set = params.keySet();
        Iterator<String> it = set.iterator();
        while (it.hasNext()) {
            String key = it.next();
            String[] values = params.get(key);
            values[0] = values[0].trim();
            params.put(key, values);
        }
    }
    /**
     * 重寫getParameter 參數(shù)從當(dāng)前類中的map獲取
     */
    @Override
    public String getParameter(String name) {
        String[] values = params.get(name);
        if (values == null || values.length == 0) {
            return null;
        }
        return values[0];
    }
    /**
     * 重寫getParameterValues
     */
    @Override
    public String[] getParameterValues(String name) {
        return params.get(name);
    }
    /**
     * 重寫getInputStream方法  post類型的請求參數(shù)必須通過流才能獲取到值
     * 這種獲取的參數(shù)的方式針對(duì)于內(nèi)容類型為文本類型，比如Content-Type:text/plain,application/json,text/html等
     * 在springmvc中可以使用@RequestBody 來獲取 json數(shù)據(jù)類型
     * 其他文本類型不做處理，重點(diǎn)處理json數(shù)據(jù)格式
     * getInputStream() ，只有當(dāng)方法為post請求，且參數(shù)為json格式是，會(huì)被默認(rèn)調(diào)用
     */
    @Override
    public ServletInputStream getInputStream() throws IOException {
        //
        if (!super.getHeader(HttpHeaders.CONTENT_TYPE).equalsIgnoreCase(MediaType.APPLICATION_JSON_VALUE) &&
                !super.getHeader(HttpHeaders.CONTENT_TYPE).equalsIgnoreCase(MediaType.APPLICATION_JSON_UTF8_VALUE)) {
            //如果參數(shù)不是json格式則直接返回
            return super.getInputStream();
        }
        //為空，直接返回
        String json = IOUtils.toString(super.getInputStream(), "utf-8");
        if (StringUtils.isEmpty(json)) {
            return super.getInputStream();
        }
        log.info("json轉(zhuǎn)化前參數(shù)：" + json);
        //json字符串首尾去空格
        JSONObject jsonObject = StringJsonUtils.JsonStrTrim(json);
        log.info("json轉(zhuǎn)化后參數(shù)：" + jsonObject.toJSONString());
        ByteArrayInputStream bis = new ByteArrayInputStream(jsonObject.toJSONString().getBytes("utf-8"));
        return new MyServletInputStream(bis);
    }
}

/**
 * 測試接口
 *
 * @author xub
 * @date 2022/10/24 下午5:06
 */
@Slf4j
@RestController
public class ParamController {
    /**
     * 1、Get請求測試首尾去空格
     */
    @GetMapping(value = "/getTrim")
    public String getTrim(@RequestParam String username, @RequestParam String phone) {
        return username + "&" + phone;
    }
    /**
     * 2、Post方法測試首尾去空格
     */
    @PostMapping(value = "/postTrim")
    public String postTrim(@RequestParam String username, @RequestParam String phone) {
        return username + "&" + phone;
    }
    /**
     * 3、post方法 json入?yún)?測試首尾去空格
     */
    @PostMapping(value = "/postJsonTrim")
    public String helloUser(@RequestBody UserDO userDO) {
        return JSONObject.toJSONString(userDO);
    }
}