前端傳輸數據到后台對參數進行去除空格處理

前端傳輸數據到后台對參數進行去除空格處理：
參考文章忘記出自哪里了，記錄一下方便自己以后查看

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

/**
 * Repeatable 過濾器
 */
public class ParamsFilter implements Filter {

    @Override
    public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException {
        ParameterRequestWrapper parmsRequest = new ParameterRequestWrapper((HttpServletRequest)arg0);
        arg2.doFilter(parmsRequest, arg1);
    }

    @Override
    public void init(FilterConfig arg0) throws ServletException {

    }

    @Override
    public void destroy() {

    }

}

import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.servlet.DispatcherType;

@Configuration
public class FilterRegistre {


    @Bean
    public FilterRegistrationBean parmsFilterRegistration() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setDispatcherTypes(DispatcherType.REQUEST);
        registration.setFilter(new ParamsFilter());
        registration.addUrlPatterns("/*");
        registration.setName("paramsFilter");
        registration.setOrder(Integer.MAX_VALUE - 1);
        return registration;
    }
}

import com.alibaba.fastjson.JSON;
import org.apache.commons.io.IOUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.util.StringUtils;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

/**
 * 過濾請求參數前后空格
 *
 */
public class ParameterRequestWrapper extends HttpServletRequestWrapper {

    private Map<String, String[]> params = new HashMap<String, String[]>();

    public ParameterRequestWrapper(HttpServletRequest request) {
        // 將request交給父類，以便於調用對應方法的時候，將其輸出，其實父親類的實現方式和第一種new的方式類似
        super(request);
        //將參數表，賦予給當前的Map以便於持有request中的參數
        Map<String, String[]> requestMap = request.getParameterMap();
        //System.out.println("轉化前參數：" + JSON.toJSONString(requestMap));
        this.params.putAll(requestMap);
        this.modifyParameterValues();
        //System.out.println("轉化后參數：" + JSON.toJSONString(params));
    }

    /**
     * 重寫getInputStream方法  post類型的請求參數必須通過流才能獲取到值
     */
    @Override
    public ServletInputStream getInputStream() throws IOException {
        //非json類型，直接返回
        if (!super.getHeader(HttpHeaders.CONTENT_TYPE).equalsIgnoreCase(MediaType.APPLICATION_JSON_VALUE)) {
            return super.getInputStream();
        }
        //為空，直接返回
        String json = IOUtils.toString(super.getInputStream(), "utf-8");
        if (StringUtils.isEmpty(json)) {
            return super.getInputStream();
        }

       /*
        * 只攔截 map 類型json數據，對於數組類型json數據放行
    */
        final char[] strChar = json.substring(0, 1).toCharArray();
        final char firstChar = strChar[0];
        if(firstChar == '{'){
            Map<String, Object> map = (Map<String, Object>) JSON.parse(json);
            map.forEach((key,value)->{
                System.out.println(key+":"+value);
                if (value instanceof String){
                    value=((String) value).trim();
                    map.put(key, value);
                }
            });

            ByteArrayInputStream bis = new ByteArrayInputStream(JSON.toJSONString(map).getBytes("utf-8"));
            return new MyServletInputStream(bis);
        }else {
            ByteArrayInputStream bis = new ByteArrayInputStream(json.getBytes("utf-8"));
            return new MyServletInputStream(bis);
        }

}

    /**
     * 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 = (String) it.next();
            String[] values = params.get(key);
            values[0] = values[0].trim();
            params.put(key, values);
        }
    }

    /**
     * 重寫getParameter 參數從當前類中的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
     */
    public String[] getParameterValues(String name) {//同上
        return params.get(name);
    }

    class MyServletInputStream extends ServletInputStream {
        private ByteArrayInputStream bis;

        public MyServletInputStream(ByteArrayInputStream bis) {
            this.bis = bis;
        }

        @Override
        public boolean isFinished() {
            return true;
        }

        @Override
        public boolean isReady() {
            return true;
        }

        @Override
        public void setReadListener(ReadListener listener) {

        }

        @Override
        public int read() throws IOException {
            return bis.read();
        }
    }

}