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说我们IIS7站长博客，有一篇博文用了他们的图片。
要求我们给他们一张图片6000元。要不然法院告我们
为避免不必要的麻烦，IIS7站长博客，全站内容图片下架、并积极应诉
博文内容全部不再显示，请需要相关资讯的站长朋友到必应搜索。谢谢！
另祝：版权碰瓷诈骗团伙，早日弃暗投明。
相关新闻：借版权之名、行诈骗之实，周某因犯诈骗罪被判处有期徒刑十一年六个月
叹！百花齐放的时代,渐行渐远!
1、需求
最近在工作中遇到的一个需求，将请求中的客户端类型、操作系统类型、ip、port、请求方式、URI以及请求参数值收集到日志中，网上找资料说用拦截器拦截所有请求然后收集信息，于是就开始了操作：
2、问题
试了之后发现当请求方式为POST，前端发送数据json时只能用request.getReader()流获取，自信满满从流中获取之后发现请求之后报错：
getInputStream() has already been called for this request...
于是网上找答案，发现是ServletRequest的getReader()和getInputStream()两个方法只能被调用一次，而且不能两个都调用。那么如果Filter中调用了一次，在Controller里面就不能再调用了。
然后又开始找解决方法，说既然ServletInputStream不支持重新读写，就把流读出来后用容器存储起来，后面就可以多次利用了。
于是继承 HttpServletRequestWrapper类（http请求包装器，其基于装饰者模式实现了HttpServletRequest界面）并实现想要重新定义的方法以达到包装原生HttpServletRequest对象。还需要在过滤器里将原生的HttpServletRequest对象替换成我们的RequestWrapper对象。
测试发现POST请求参数值可以在拦截器类中获取到了，本以为大功告成，又发现GET请求不好使了，开始报错Stream closed，一顿操作发现需要在过滤器进行判断，如果是POST请求走自己的继承的HttpServletRequestWrapper类请求，否则走普通的请求。终于成功！突然舒服了。
2、获取
1）导入依赖为了获取客户端类型、操作系统类型、ip、port
<dependency>
<groupId>eu.bitwalker</groupId>
<artifactId>UserAgentUtils</artifactId>
<version>1.21</version>
</dependency>
2）封装获取body字符串的工具类
package com.btrc.access.util;
import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
public class RequestUtil {
public static String getBodyString(HttpServletRequest request) {
StringBuilder sb = new StringBuilder();
try (
InputStream inputStream = request.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, Charset.forName("UTF-8")))
) {
String line;
while ((line = reader.readLine()) != null) {
sb.append(line);
}
} catch (IOException e) {
e.printStackTrace();
}
return sb.toString();
}
}
3）拦截器类
package com.btrc.access.filter;
import com.btrc.access.util.RequestUtil;
import eu.bitwalker.useragentutils.UserAgent;
import org.apache.commons.lang.StringUtils;
import org.springframework.http.HttpMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* 请求拦截器：拦截请求目的是将请求的信息收集到日志
*/
public class RequestInterceptor implements HandlerInterceptor {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
UserAgent userAgent = UserAgent.parseUserAgentString(request.getHeader("user-agent"));
//客户端类型
String clientType = userAgent.getOperatingSystem().getDeviceType().getName();
//客户端操作系统类型
String osType = userAgent.getOperatingSystem().getName();
//客户端ip
String clientIp = request.getRemoteAddr();
//客户端port
int clientPort = request.getRemotePort();
//请求方式
String requestMethod = request.getMethod();
//客户端请求URI
String requestURI = request.getRequestURI();
//客户端请求参数值
String requestParam;
//如果请求是POST获取body字符串，否则GET的话用request.getQueryString()获取参数值
if(StringUtils.equalsIgnoreCase(HttpMethod.POST.name(), requestMethod)){
requestParam = RequestUtil.getBodyString(request);
}else{
requestParam = request.getQueryString();
}
//客户端整体请求信息
StringBuilder clientInfo = new StringBuilder();
clientInfo.append("客户端信息:[类型:").append(clientType)
.append(", 操作系统类型:").append(osType)
.append(", ip:").append(clientIp)
.append(", port:").append(clientPort)
.append(", 请求方式:").append(requestMethod)
.append(", URI:").append(requestURI)
.append(", 请求参数值:").append(requestParam.replaceAll("\\s*", ""))
.append("]");
//***这里的clientInfo就是所有信息了，请根据自己的日志框架进行收集***
System.out.println(clientInfo);
//返回ture才会继续执行，否则一直拦截住
return true;
}
}
4）继承 HttpServletRequestWrapper类
package com.btrc.access.filter;
import com.btrc.access.util.RequestUtil;
import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;
import java.nio.charset.Charset;
public class AccessRequestWrapper extends HttpServletRequestWrapper {
private final byte[] body;
public AccessRequestWrapper(HttpServletRequest request) {
super(request);
body = RequestUtil.getBodyString(request).getBytes(Charset.forName("UTF-8"));
}
@Override
public BufferedReader getReader() throws IOException {
return new BufferedReader(new InputStreamReader(getInputStream()));
}
@Override
public ServletInputStream getInputStream() throws IOException {
final ByteArrayInputStream bais = new ByteArrayInputStream(body);
return new ServletInputStream() {
@Override
public int read() throws IOException {
return bais.read();
}
@Override
public boolean isFinished() {
return false;
}
@Override
public boolean isReady() {
return false;
}
@Override
public void setReadListener(ReadListener readListener) {
}
};
}
}
5）过滤器类
package com.btrc.access.filter;
import org.apache.commons.lang.StringUtils;
import org.springframework.http.HttpMethod;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class AccessFilter implements Filter {
@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;
//如果是POST走自己的继承的HttpServletRequestWrapper类请求，否则走正常的请求
if(StringUtils.equalsIgnoreCase(HttpMethod.POST.name(), request.getMethod())){
//一定要在判断中new对象，否则还会出现Stream closed问题
filterChain.doFilter(new AccessRequestWrapper(request),servletResponse);
}else{
filterChain.doFilter(servletRequest,servletResponse);
}
}
@Override
public void destroy() {
}
}
6）拦截器过滤器配置类
package com.btrc.access.config;
import com.btrc.access.filter.AccessFilter;
import com.btrc.access.filter.RequestInterceptor;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
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.WebMvcConfigurer;
import javax.servlet.Filter;
/**
* 拦截器过滤器配置类
*/
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
@Bean
public FilterRegistrationBean httpServletRequestReplacedFilter() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter(new AccessFilter());
// /* 是全部的请求拦截，和Interceptor的拦截地址/**区别开
registration.addUrlPatterns("/*");
registration.setName("accessRequestFilter");
registration.setOrder(1);
return registration;
}
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new RequestInterceptor()).addPathPatterns("/**");
}
}
总结
