注意，request body中获取参数时使用流获取，但是request的流只能使用一次，

给出的办法就是在获取流之前对流进行复制否则会出异常

（request body miss）

spring请求的链式执行顺序为Filter-->拦截器-->controller

1：首先自定义一个类继承HttpServletRequestWrapper，用来备份流

import javax.servlet.ReadListener;import javax.servlet.ServletInputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletRequestWrapper;import java.io.*;public class RequestWrapper extends HttpServletRequestWrapper {    private final String body;    public RequestWrapper(HttpServletRequest request) {        super(request);        StringBuilder stringBuilder = new StringBuilder();        BufferedReader bufferedReader = null;        InputStream inputStream = null;        try {            inputStream = request.getInputStream();            if (inputStream != null) {                bufferedReader = new BufferedReader(new InputStreamReader(inputStream));                char[] charBuffer = new char[128];                int bytesRead = -1;                while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {                    stringBuilder.append(charBuffer, 0, bytesRead);                }            } else {                stringBuilder.append("");            }        } catch (IOException ex) {        } finally {            if (inputStream != null) {                try {                    inputStream.close();                }                catch (IOException e) {                    e.printStackTrace();                }            }            if (bufferedReader != null) {                try {                    bufferedReader.close();                }                catch (IOException e) {                    e.printStackTrace();                }            }        }        body = stringBuilder.toString();    }    @Override    public ServletInputStream getInputStream() throws IOException {        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body.getBytes());        ServletInputStream servletInputStream = new ServletInputStream() {            @Override            public boolean isFinished() {                return false;            }            @Override            public boolean isReady() {                return false;            }            @Override            public void setReadListener(ReadListener readListener) {            }            @Override            public int read() throws IOException {                return byteArrayInputStream.read();            }        };        return servletInputStream;    }    @Override    public BufferedReader getReader() throws IOException {        return new BufferedReader(new InputStreamReader(this.getInputStream()));    }    public String getBody() {        return this.body;    }}

 

2、拦截器层面

 

import cn.com.connext.authority.config.RequestWrapper;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Component;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;

 

 

 

@Component("authSecurityInterceptor")public class AuthSecurityInterceptor extends HandlerInterceptorAdapter {    private Logger logger = LoggerFactory.getLogger(AuthSecurityInterceptor.class);    @Override    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {        try {            RequestWrapper requestWrapper = new RequestWrapper(httpServletRequest);            String body = requestWrapper.getBody();            System.out.println(body);            return true;        }catch (Exception e){                    }        return false;    }    @Override    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {    }    @Override    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {    }}

 

这里body 就是获取到的请求参数，使用时注意，有些接口没有请求参数

 

③过滤器Filter，用来把request传递下去

import javax.servlet.*;import javax.servlet.annotation.WebFilter;import javax.servlet.http.HttpServletRequest;import java.io.IOException;@WebFilter(urlPatterns = "/*",filterName = "channelFilter")public class ChannelFilter implements Filter {    @Override    public void init(FilterConfig filterConfig) throws ServletException {    }     @Override    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {        ServletRequest requestWrapper = null;        if(servletRequest instanceof HttpServletRequest) {            requestWrapper = new RequestWrapper((HttpServletRequest) servletRequest);        }        if(requestWrapper == null) {            filterChain.doFilter(servletRequest, servletResponse);        } else {            filterChain.doFilter(requestWrapper, servletResponse);        }    }     @Override    public void destroy() {    }}作者：woniu95链接：https://www.jianshu.com/p/69c6fba08c92來源：简书简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。

 

④在启动类中注册拦截器

import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.web.servlet.MultipartConfigFactory;import org.springframework.boot.web.servlet.ServletComponentScan;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;@SpringBootApplication@ServletComponentScan  //注册过滤器注解@Configurationpublic class WebApplication {    public static void main(String[] args) {        SpringApplication.run(WebApplication.class, args);    }}

 

感谢：https://www.jianshu.com/p/69c6fba08c92