拦截器(Inteceptor)，过滤器(Filter)，切面(Aspect)处理HttpServiceReqeust请求

1.拦截器

java里的拦截器是动态拦截Action调用的对象。它提供了一种机制可以使开发者可以定义在一个action执行的前后执行的代码，也可以在一个action执行前阻止其执行，同时也提供了一种可以提取action中可重用部分的方式。在AOP（Aspect-Oriented Programming）中拦截器用于在某个方法或字段被访问之前，进行拦截然后在之前或之后加入某些操作。

package com.shitou.deposit.interceptor;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.lang.reflect.Parameter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.MethodParameter;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.shitou.deposit.contract.dto.req.Request;

/**
 * DepositInterceptor
 * @author zhouky
 * @since 2018年12月27日
 */
public class DepositInterceptor implements HandlerInterceptor {
	private Logger logger = LoggerFactory.getLogger(getClass());
	
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
		logger.info("DepositInterceptor ...");
		
		// 所有请求第一个进入的方法
		String reqURL = request.getRequestURL().toString();
		String ip = request.getRemoteHost ();
		InputStream is = request.getInputStream ();
		StringBuilder responseStrBuilder = new StringBuilder ();
		BufferedReader streamReader = new BufferedReader (new InputStreamReader (is,"UTF-8"));
		String inputStr;
		while ((inputStr = streamReader.readLine()) != null) responseStrBuilder.append(inputStr);
		String parmeter = responseStrBuilder.toString();
		long startTime = System.currentTimeMillis();
		request.setAttribute("startTime", startTime);
		if (handler instanceof HandlerMethod) {
			StringBuilder sb = new StringBuilder(1000);
			sb.append("-----------------------
");
			HandlerMethod h = (HandlerMethod) handler;
			Parameter[] objs =h.getMethod().getParameters();
			for(Object obj:objs){
				Request req = (Request) obj;
				System.out.println("");
				if(obj instanceof Request){
				}
			}
			
			//Controller 的包名
			sb.append("Controller: ").append(h.getBean().getClass().getName()).append("
");
			//方法名称
			sb.append("Method: ").append(h.getMethod().getName()).append("
");
			//请求方式postputget 等等
			sb.append("RequestMethod: ").append(request.getMethod()).append("
");
			//所有的请求参数
			sb.append("Params: ").append(parmeter).append("
");
			//部分请求链接
			sb.append("URI : ").append(request.getRequestURI()).append("
");
			//完整的请求链接
			sb.append("AllURI: ").append(reqURL).append("
");
			//请求方的 ip地址
			sb.append("request IP: ").append(ip).append("
");
			logger.info(sb.toString());
		}
		//修改request中的参数并保存到request中 
		request.setAttribute("parmeter_json", parmeter);
		
		return true;
	}
	
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {}
	
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {}
	
}

　　

package com.shitou.deposit.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

import com.shitou.deposit.interceptor.DepositInterceptor;
import com.shitou.deposit.interceptor.DepositInterceptor1;

/**
 * InterceptorConfig
 * @author zhouky
 * @since 2018年12月27日
 */
@Configuration
public class InterceptorConfig extends WebMvcConfigurerAdapter {

    @Bean
    public DepositInterceptor getDepositInterceptor() {
        return new DepositInterceptor();
    }
    
    @Bean
    public DepositInterceptor1 getDepositInterceptor1() {
        return new DepositInterceptor1();
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
    	registry.addInterceptor(getDepositInterceptor()).addPathPatterns("/deposit/**");
//    	registry.addInterceptor(getDepositInterceptor1()).addPathPatterns("/deposit/**");
        super.addInterceptors(registry);
    }
    
}

　　

package com.shitou.deposit.interceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import com.alibaba.fastjson.JSONObject;
import com.shitou.deposit.filter.BufferedServletRequestWrapper;

/**
 * DepositInterceptor1
 * @author zhouky
 * @since 2018年12月27日
 */
public class DepositInterceptor1 implements HandlerInterceptor {
	private Logger logger = LoggerFactory.getLogger(getClass());
	
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
		logger.info("DepositInterceptor begin ...");
		
		BufferedServletRequestWrapper requestWrapper = new BufferedServletRequestWrapper(request);
	    //在这边替换流，使用工具类GetRequestJsonUtils获取json参数
		JSONObject json = GetRequestJsonUtils.getRequestJsonObject(requestWrapper);
		
		logger.info("DepositInterceptor end ...{}",json.toJSONString());
		return true;
	}
	
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {}
	
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {}
	
}

　　

package com.shitou.deposit.filter;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

/**
 * BufferedServletRequestWrapper
 * @author zhouky
 * @since 2018年12月27日
 */
public class BufferedServletRequestWrapper extends HttpServletRequestWrapper {
 
	private byte[] buffer;
 
	public BufferedServletRequestWrapper(HttpServletRequest request) throws IOException {
		super(request);
		InputStream is = request.getInputStream();
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		byte buff[] = new byte[1024];
		int read;
		while ((read = is.read(buff)) > 0) {
			baos.write(buff, 0, read);
		}
		this.buffer = baos.toByteArray();
	}
 
	@Override
	public ServletInputStream getInputStream() throws IOException {
		return new BufferedServletInputStream(this.buffer);
	}
 
	// 对外提供读取流的方法
	@Override
	public BufferedReader getReader() throws IOException {
		return new BufferedReader(new InputStreamReader(getInputStream()));
	}
}

　　

package com.shitou.deposit.interceptor;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang3.StringUtils;

import com.alibaba.fastjson.JSONObject;

/**
 * GetRequestJsonUtils
 * @author zhouky
 * @since 2018年12月27日
 */
public class GetRequestJsonUtils {
	
	public static JSONObject getRequestJsonObject(HttpServletRequest request) throws IOException {
		String json = getRequestJsonString(request);
		return JSONObject.parseObject(json);
	}
	
	 /***
     * 获取 request 中 json 字符串的内容
     * 
     * @param request
     * @return : <code>byte[]</code>
     * @throws IOException
     */
    public static String getRequestJsonString(HttpServletRequest request)
            throws IOException {
        String submitMehtod = request.getMethod();
        // GET
        if (submitMehtod.equals("GET")) {
        	if(StringUtils.isNotEmpty(request.getQueryString())){
        		return new String(request.getQueryString().getBytes("iso-8859-1"),"utf-8").replaceAll("%22", """);
        	}else{
        		return new String("".getBytes("iso-8859-1"), "utf-8").replaceAll("%22", """);
        	}
        // POST
        } else {
            return getRequestPostStr(request);
        }
    }
 
    /**      
     * 描述:获取 post 请求的 byte[] 数组
     * <pre>
     * 举例：
     * </pre>
     * @param request
     * @return
     * @throws IOException      
     */
    public static byte[] getRequestPostBytes(HttpServletRequest request)
            throws IOException {
        int contentLength = request.getContentLength();
        if(contentLength<0){
            return null;
        }
        byte buffer[] = new byte[contentLength];
        for (int i = 0; i < contentLength;) {
 
            int readlen = request.getInputStream().read(buffer, i,
                    contentLength - i);
            if (readlen == -1) {
                break;
            }
            i += readlen;
        }
        return buffer;
    }
 
    /**      
     * 描述:获取 post 请求内容
     * <pre>
     * 举例：
     * </pre>
     * @param request
     * @return
     * @throws IOException      
     */
    public static String getRequestPostStr(HttpServletRequest request)
            throws IOException {
        byte buffer[] = getRequestPostBytes(request);
        String charEncoding = request.getCharacterEncoding();
        if (charEncoding == null) {
            charEncoding = "UTF-8";
        }
        return new String(buffer, charEncoding);
    }
}

　　2.过滤器

package com.shitou.deposit.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Component;

/**
 * DepositFilter
 * @author zhouky
 * @since 2018年12月27日
 */
@Component
@WebFilter(filterName="DepositFilter",urlPatterns="/**")
public class DepositFilter implements Filter{
 
	/**
	 * 过滤
	 */
	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		ServletRequest requestWrapepr = null;
		if(request instanceof HttpServletRequest){
			requestWrapepr = new BufferedServletRequestWrapper((HttpServletRequest)request);
		}
		if(requestWrapepr == null){
			chain.doFilter(request, response);
		}else{
			chain.doFilter(requestWrapepr, response);
		}
	}
 
	/**
	 * 初始化
	 */
	@Override
	public void init(FilterConfig arg0) throws ServletException {}
	
	/**
	 * 销毁
	 */
	@Override
	public void destroy() {}
 
}

　　

package com.shitou.deposit.filter;

import java.io.ByteArrayInputStream;
import java.io.IOException;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;

class BufferedServletInputStream extends ServletInputStream {
    private ByteArrayInputStream inputStream;
    public BufferedServletInputStream(byte[] buffer) {
        this.inputStream = new ByteArrayInputStream( buffer );
    }
    @Override
    public int available() throws IOException {
        return inputStream.available();
    }
    @Override
    public int read() throws IOException {
        return inputStream.read();
    }
    @Override
    public int read(byte[] b, int off, int len) throws IOException {
        return inputStream.read( b, off, len );
    }
	@Override
	public boolean isFinished() {
		return false;
	}
	@Override
	public boolean isReady() {
		return false;
	}
	@Override
	public void setReadListener(ReadListener listener) {}
}

　　

package com.shitou.deposit.filter;

import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

/**
 * BufferedServletRequestWrapper
 * @author zhouky
 * @since 2018年12月27日
 */
public class BufferedServletRequestWrapper extends HttpServletRequestWrapper {
 
	private byte[] buffer;
 
	public BufferedServletRequestWrapper(HttpServletRequest request) throws IOException {
		super(request);
		InputStream is = request.getInputStream();
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		byte buff[] = new byte[1024];
		int read;
		while ((read = is.read(buff)) > 0) {
			baos.write(buff, 0, read);
		}
		this.buffer = baos.toByteArray();
	}
 
	@Override
	public ServletInputStream getInputStream() throws IOException {
		return new BufferedServletInputStream(this.buffer);
	}
 
	// 对外提供读取流的方法
	@Override
	public BufferedReader getReader() throws IOException {
		return new BufferedReader(new InputStreamReader(getInputStream()));
	}
}

　　

package com.shitou.deposit.filter;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import com.alibaba.fastjson.JSONObject;

//@Component
//@WebFilter(filterName = "DepositFilter1", urlPatterns = "/*")
public class DepositFilter1 implements Filter {

	@SuppressWarnings("unused")
	private Logger logger = LoggerFactory.getLogger(DepositFilter1.class);

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

	@Override
	public void doFilter(ServletRequest srequest, ServletResponse sresponse, FilterChain filterChain)
			throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) srequest;
		// 访问地址
		String uri = request.getRequestURI();
		if ("/deposit/execute".equals(uri)) {
			Map<String,Object> m = new HashMap<String, Object>(request.getParameterMap());
			logger.info(JSONObject.toJSONString(m));
			HttpServletRequest req = (HttpServletRequest) request;
			ParameterRequestWrapper wrapRequest = new ParameterRequestWrapper(req, m);
			logger.info(JSONObject.toJSONString(wrapRequest.getParameterMap()));
			request = wrapRequest;
		}
		filterChain.doFilter(request, sresponse);
	}

	@Override
	public void destroy() {}

}

　　3.切面

package com.shitou.deposit.aspect;

import java.util.Base64;
import java.util.Map;

import org.apache.commons.lang3.StringUtils;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import com.shitou.deposit.baofu.config.BaoFuConfig;
import com.shitou.deposit.contract.dto.req.Request;
import com.shitou.deposit.lanmaoly.config.LanMaolyConfig;
import com.shitou.deposit.strategy.enums.TransactionChannelEnum;
import com.shitou.framework.log.LOG_TYPE;

@SuppressWarnings("unchecked")
//@Component
//@Aspect
public class DepositAspect {
    private final Logger logger = LoggerFactory.getLogger(LOG_TYPE.CONTROLLER_ASPECT.val);

    @Pointcut("@annotation(org.springframework.web.bind.annotation.RequestMapping)")
    public void depositAspect() {}

    @Before(value = "depositAspect()")
    public void beforeAdvice(JoinPoint pjp) throws Throwable {
        Object[] objects = pjp.getArgs();
        for(Object obj:objects){
        	if(obj instanceof Request){
        		Request paramVO = (Request) obj;
        		
				Map<String,Object> reqMap = (Map<String, Object>) paramVO.getReqData();
        		boolean bool = reqMap.containsKey("retUrl");
        		if(bool){
        			String retUrl = (String) reqMap.get("retUrl");
        			if(StringUtils.isNotBlank(retUrl)){
        				String encodedUrl = Base64.getEncoder().encodeToString(retUrl.getBytes());
        				if(TransactionChannelEnum.LANM.getCode().equals("")&&
        						!"1".equals(LanMaolyConfig.ifSyncDirectSwitch)){// 懒猫是否开启同步回盘直连前端开关 1-是 0-否
        					retUrl = LanMaolyConfig.syncLM+"/"+encodedUrl;
        				}else if(TransactionChannelEnum.BAOF.getCode().equals("")&&
        						!"1".equals(BaoFuConfig.ifSyncDirectSwitch)){
        					retUrl = BaoFuConfig.syncBF+"/"+encodedUrl;
        				}
        				reqMap.put("retUrl", retUrl);
        				paramVO.setReqData(reqMap);
        			}
        		}
        	}
        }

    }
}