解决：getReader() has already been called for this request

在 Filter 中对 request 中的 body 进行参数签名校验, 会报如下错误:

getReader() has already been called for this request

原因是 request.getReader() 和 request.getInputStream() 都是只能调用一次

并且 getReader() 方法底层也是调用 getInputStream() 来实现的.

所以我们要使用 HttpServletRequestWrapper 来实现自定义的 CustomHttpServletRequestWrapper, 把 body 保存在 CustomHttpServletRequestWrapper 中, 并且重写 getInputStream() 方法

重写 HttpServletRequestWrapper

package com.fosung.pb.village.config;import org.apache.commons.fileupload.servlet.ServletFileUpload;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;public class MyRequestWrapper extends HttpServletRequestWrapper {private byte[] body;public MyRequestWrapper(HttpServletRequest request) throws IOException {super(request);if(ServletFileUpload.isMultipartContent(request)){return;}StringBuilder sb = new StringBuilder();String line;BufferedReader reader = request.getReader();while ((line = reader.readLine()) != null) {sb.append(line);}String body = sb.toString();this.body = body.getBytes(StandardCharsets.UTF_8);}public String getBody() {return new String(this.body , StandardCharsets.UTF_8) ;}@Overridepublic ServletInputStream getInputStream() {final ByteArrayInputStream bais = new ByteArrayInputStream(body);return new ServletInputStream() {@Overridepublic boolean isFinished() {return false;}@Overridepublic boolean isReady() {return false;}@Overridepublic void setReadListener(ReadListener readListener) {}@Overridepublic int read(){return bais.read();}};}@Overridepublic BufferedReader getReader(){return new BufferedReader(new InputStreamReader(this.getInputStream()));}
}

Filter 使用

package com.fosung.pb.village.config;import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;/*** @author lanx* @date 2022/4/11*/
@Slf4j
@Component
@WebFilter(filterName = "AntiSqlInjectionfilter", urlPatterns = "/*")
public class AntiSqlInjectionfilter implements Filter {public void destroy() {// TODO Auto-generated method stub}public void init(FilterConfig arg0) throws ServletException {// TODO Auto-generated method stub}public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {HttpServletRequest req = (HttpServletRequest) request;HttpServletResponse res = (HttpServletResponse) response;MyRequestWrapper myRequestWrapper = null;// 获取请求bodytry {myRequestWrapper = new MyRequestWrapper(req);} catch (IOException e) {log.error("get request body exception", e);throw new RuntimeException(e);}if ("POST".equalsIgnoreCase(req.getMethod())) {String param = myRequestWrapper.getBody();chain.doFilter(myRequestWrapper, response);} else {chain.doFilter(myRequestWrapper, response);}}}

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解决：getReader() has already been called for this request

重写 HttpServletRequestWrapper

Filter 使用

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