Fileter 过滤器拦截请求对POST ,GET 请求进行处理

//配置过滤器

import com.paas.filter.InterfaceFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;


@Configuration
public class WebFileterConfig {
    /**
     * 配置过滤器
     */
    @Bean
    public FilterRegistrationBean filterRegistration() {

        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(new InterfaceFilter());
        //设置过滤器URL
        registrationBean.addUrlPatterns("/*");
        registrationBean.setOrder(Integer.MAX_VALUE - 10);
        return registrationBean;

    }
}

//包装类

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;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;


public class HttpRequestBodyAndParamsWrapper extends HttpServletRequestWrapper {
    private String body;
    private final Map<String , String[]> params = new HashMap<String, String[]>();


    public HttpRequestBodyAndParamsWrapper(HttpServletRequest request) throws IOException {
        super(request);
        this.params.putAll(request.getParameterMap());
    }

    public HttpRequestBodyAndParamsWrapper(HttpServletRequest request, String context) {
        super(request);
        body = context;
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body.getBytes(StandardCharsets.UTF_8));
        ServletInputStream servletInputStream = new ServletInputStream() {
            @Override
            public int read() throws IOException {
                return byteArrayInputStream.read();
            }

            @Override
            public boolean isFinished() {
                return false;
            }

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

            @Override
            public void setReadListener(ReadListener listener) {

            }
        };
        return servletInputStream;
    }

    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(this.getInputStream()));
    }
    /**
     * 添加参数到map中
     * @param extraParams
     */
    public void setParameterMap(Map<String, Object> extraParams) {
        for (Map.Entry<String, Object> entry : extraParams.entrySet()) {
            setParameter(entry.getKey(), entry.getValue());
        }
    }

    /**
     * 添加参数到map中
     * @param name
     * @param value
     */
    public void setParameter(String name, Object value) {
        if (value != null) {
            System.out.println(value);
            if (value instanceof String[]) {
                params.put(name, (String[]) value);
            } else if (value instanceof String) {
                params.put(name, new String[]{(String) value});
            } else {
                params.put(name, new String[]{String.valueOf(value)});
            }
        }
    }

    /**
     * 重写getParameter，代表参数从当前类中的map获取
     * @param name
     * @return
     */
    @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方法，从当前类的 map中取值
     * @param name
     * @return
     */
    @Override
    public String[] getParameterValues(String name) {
        return params.get(name);
    }
}

//过滤器

package com.paas.filter;

import com.paas.common.security.RSAUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpMethod;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

@Slf4j
public class InterfaceFilter implements Filter {

    @Override
    public void destroy() {
        log.info("过滤器执行结束");
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        // 获取请求地址
        String url = ((HttpServletRequest) request).getRequestURI().substring(((HttpServletRequest) request).getContextPath().length());
        log.info("------------------请求地址,{}---------------",url);
        HttpRequestBodyAndParamsWrapper httpRequestBodyAndParamsWrapper = new HttpRequestBodyAndParamsWrapper(
                (HttpServletRequest) request);
        try {
            // 根据不同的请求方法类型 做 不同的参数处理业务
            if (HttpMethod.POST.matches(httpServletRequest.getMethod())) {
               
                String body = getBody(httpServletRequest);
                      //处理加密解密
              
                httpServletRequest = new HttpRequestBodyAndParamsWrapper(httpServletRequest, newBody);
                chain.doFilter(httpServletRequest,response);
              
            }
            if (HttpMethod.GET.matches(httpServletRequest.getMethod())) {
                                //修改参数值、
请求参数
                    //httpRequestBodyAndParamsWrapper.setParameter("","");
                    chain.doFilter(httpRequestBodyAndParamsWrapper, response);
           
            }
            chain.doFilter(httpServletRequest,response);
           
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    //获取Request的body数据
    private String getBody(ServletRequest 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();
                }
            }
        }
        return stringBuilder.toString();
    }
}