springboot配置多個過濾器

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遇到的問題

1. 如何配置多個過濾器

2. 如何解決調用順序問題

3. 如何解決body值取了後，控制層爲null

4. 如何通過@value動態讀取nacos配置文件值

5. 響應數據到頁面

package com.ess.fourier.trace.filter;

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

import javax.servlet.Filter;

@Configuration
public class ComponentFilterOrderConfig {

    @Bean
	@RefreshScope
	public Filter sIDCheckFilter(){
		return new FourierSIDCheckFilter();//自定義的過濾器
	}
	
	@RefreshScope
	@Bean
	public Filter signCheckFilter(){
		return new FourierSignCheckFilter();//自定義的過濾器
	}

    @Bean
    public FilterRegistrationBean filterRegistrationBean1() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(sIDCheckFilter());
        filterRegistrationBean.addUrlPatterns("/new/entry");
        //order的數值越小 則優先級越高
        filterRegistrationBean.setOrder(1);
        return filterRegistrationBean;
    }

    @Bean
    public FilterRegistrationBean filterRegistrationBean2() {
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.setFilter(signCheckFilter());
        filterRegistrationBean.addUrlPatterns("/new/entry");
        //order的數值越小 則優先級越高
        filterRegistrationBean.setOrder(2);
        return filterRegistrationBean;
    }
}

package com.ess.fourier.trace.filter;

import org.apache.commons.io.IOUtils;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * 解決讀取body數據後，在其他地方無法再次讀取的問題
 * @author kangyu
 * @date 10:21 2020/7/7
 */
public class ContentCachingRequestWrapper extends HttpServletRequestWrapper {

    private byte[] body;

    private BufferedReader reader;

    private ServletInputStream inputStream;

    public ContentCachingRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        loadBody(request);
    }

    private void loadBody(HttpServletRequest request) throws IOException {
        body = IOUtils.toByteArray(request.getInputStream());
        inputStream = new RequestCachingInputStream(body);
    }

    public byte[] getBody() {
        return body;
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        if (inputStream != null) {
            return inputStream;
        }
        return super.getInputStream();
    }

    @Override
    public BufferedReader getReader() throws IOException {
        if (reader == null) {
            reader = new BufferedReader(new InputStreamReader(inputStream, getCharacterEncoding()));
        }
        return reader;
    }

    private static class RequestCachingInputStream extends ServletInputStream {

        private final ByteArrayInputStream inputStream;

        public RequestCachingInputStream(byte[] bytes) {
            inputStream = new ByteArrayInputStream(bytes);
        }

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

        @Override
        public boolean isFinished() {
            return inputStream.available() == 0;
        }

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

        @Override
        public void setReadListener(ReadListener readlistener) {
        }

    }

}

package com.ess.fourier.trace.filter;

import com.ess.fourier.commons.constant.FourierRedisKeyConstants;
import com.ess.framework.api.response.ApiResponse;
import com.ess.framework.commons.response.RequestCode;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.concurrent.TimeUnit;

/**
 * @Classname MyHiddenHttpMethodFilter
 * @Description sid過濾器
 * @Date 2020/7/7 9:30
 * @Created by kangyu
 */
@Slf4j
@Component
@RefreshScope
public class FourierSIDCheckFilter implements Filter {

    @Value("${xxxxxxxxxx}")
    private boolean validSid = true;

    @Autowired
    private StringRedisTemplate redisTemplate;

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        
        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void destroy() {
    }
}

package com.ess.fourier.trace.filter;

import com.ess.framework.api.response.ApiResponse;
import com.ess.framework.commons.response.RequestCode;
import com.ess.framework.commons.utils.SignUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.stereotype.Component;

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

/**
 * @Classname MyHiddenHttpMethodFilter
 * @Description sid過濾器
 * @Date 2020/7/7 9:30
 * @Created by kangyu
 */
@Slf4j
@Component
@RefreshScope
public class FourierSignCheckFilter implements Filter {

    @Value("${validSign }")
    private boolean validSign = true;

    @Value("${xxccc:}")
    private String md5Salt = "";

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        String sign = request.getHeader("sign");
        String sid = request.getHeader("sid");
        ContentCachingRequestWrapper requestWrapper = new ContentCachingRequestWrapper((HttpServletRequest) request);
        String bodyStr = new String(requestWrapper.getBody(), request.getCharacterEncoding());
        log.info("filter request body is {}", bodyStr);
        
        filterChain.doFilter(requestWrapper, servletResponse);
    }

    @Override
    public void destroy() {
    }
}

package com.ess.fourier.trace.filter;

import com.alibaba.fastjson.JSON;
import com.ess.framework.api.response.ApiResponse;
import org.springframework.http.MediaType;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * @Classname ResponseWrite
 * @Description TODO
 * @Date 2020/7/7 11:54
 * @Created by kangyu
 */
public class ResponseWrite {

    /**
     * 響應數據到頁面
     *
     * @param response,responseMap
     * @return void
     * @author kangyu
     * @date 11:31 2020/7/7
     */
    public static void write(HttpServletResponse response, ApiResponse<String> responseMap) throws IOException, ServletException {
        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
        response.setCharacterEncoding("UTF-8");
        PrintWriter writer = response.getWriter();
        writer.write(JSON.toJSONString(responseMap));
        writer.flush();
        writer.close();
    }
}