请求参数过滤器 （去请求参数前后空格）—— springboot

1、ParameterRequestWrapper

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

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;

/**
 * Description : 请求参数的封装，暂时只有去前后空格
 *
 */

public class ParameterRequestWrapper extends HttpServletRequestWrapper {

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


    public ParameterRequestWrapper(HttpServletRequest request) {
        // 将request交给父类，以便于调用对应方法的时候，将其输出，其实父亲类的实现方式和第一种new的方式类似
        super(request);
        //将参数表，赋予给当前的Map以便于持有request中的参数
        Map<String, String[]> requestMap=request.getParameterMap();

        this.params.putAll(requestMap);
        this.modifyParameterValues();

    }
    /**
     * 重写getInputStream方法  post类型的请求参数必须通过流才能获取到值
     */
    @Override
    public ServletInputStream getInputStream() throws IOException {
        //非json类型，直接返回
        if(!super.getHeader(HttpHeaders.CONTENT_TYPE).equalsIgnoreCase(MediaType.APPLICATION_JSON_VALUE)){
            return super.getInputStream();
        }
        //为空，直接返回
        String json = IOUtils.toString(super.getInputStream(), "utf-8");
        if (StringUtils.isEmpty(json)) {
            return super.getInputStream();
        }
        System.out.println("转化前参数："+json);
        Map<String,Object> map= (Map<String, Object>) JSON.parse(json);
        System.out.println("转化后参数："+JSON.toJSONString(map));
        ByteArrayInputStream bis = new ByteArrayInputStream(JSON.toJSONString(map).getBytes("utf-8"));
        return new MyServletInputStream(bis);

    }
    /**
     * 将parameter的值去除空格后重写回去
     */
    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);
        }
    }
    /**
     * 重写getParameter 参数从当前类中的map获取
     */
    @Override
    public String getParameter(String name) {
        String[]values = params.get(name);
        if(values == null || values.length == 0) {
            return null;
        }
        return values[0];
    }
    /**
     * 重写getParameterValues
     */
    @Override
    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();
        }
    }

}

2、ParamsFilter

import cn.com.framework.config.ParameterRequestWrapper;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

/**
 * Description : 参数过滤器
 *
 */
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() {

    }

}

3、配置该Filter

@Configuration
public class DefaultConfig {

    /**
     * 去除参数头尾空格过滤器
     * @return
     */
    @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;
    }
}