解决spring 处理request.getInputStream()输入流只能读取一次问题

一般我们会在InterceptorAdapter拦截器中对请求进行验证

正常普通接口请求，request.getParameter()可以获取，能多次读取

如果我们的接口是用@RequestBody来接受数据，那么我们在拦截器中

需要读取request的输入流，因为 ServletRequest中getReader()和getInputStream()只能调用一次

这样就会导致controller 无法拿到数据。

解决方法：

1、自定义一个类 BodyReaderHttpServletRequestWrapper.java

import java.io.BufferedReader;

import java.io.ByteArrayInputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import javax.servlet.ReadListener;

import javax.servlet.ServletInputStream;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletRequestWrapper;

import org.springframework.util.StreamUtils;

/**

* @author WBG

* @date 2020/6/22 10:42

* @describe

*/

public class BodyReaderHttpServletRequestWrapper extends HttpServletRequestWrapper{

private byte[] requestBody = null;//用于将流保存下来

public BodyReaderHttpServletRequestWrapper(HttpServletRequest request) throws IOException {

super(request);

requestBody = StreamUtils.copyToByteArray(request.getInputStream());

}

@Override

public ServletInputStream getInputStream() throws IOException {

final ByteArrayInputStream bais = new ByteArrayInputStream(requestBody);

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) {

}

};

}

@Override

public BufferedReader getReader() throws IOException{

return new BufferedReader(new InputStreamReader(getInputStream()));

}

2、自定义 MyFilter 继承Filter

import javax.servlet.*;

import javax.servlet.http.HttpServletRequest;

import java.io.BufferedReader;

import java.io.IOException;

/**

* @author WBG

* @date 2020/6/22 14:32

* @describe

*/

public class MyFilter implements Filter {

@Override

public void init(FilterConfig filterConfig) throws ServletException {

System.out.println("开始");

}

@Override

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

ServletRequest requestWrapper=null;

if(request instanceof HttpServletRequest) {

requestWrapper=new BodyReaderHttpServletRequestWrapper((HttpServletRequest)request);

}

if(requestWrapper==null) {

chain.doFilter(request, response);

}else {

System.out.println("------------------------------请求报文----------------------------------");

System.out.println(getParamsFromRequestBody((HttpServletRequest) requestWrapper));

System.out.println("------------------------------请求报文----------------------------------");

chain.doFilter(requestWrapper, response);

}

/* *

* 获取请求体内容

* @return

* @throws IOException

*/

private String getParamsFromRequestBody(HttpServletRequest request) throws IOException {

BufferedReader br = null;

String listString = "";

try {

br = request.getReader();

String str = "";

while ((str = br.readLine()) != null) {

listString += str;

}

} catch (IOException e) {

e.printStackTrace();

}

return listString;

}

@Override

public void destroy() {

System.out.println("destroy");

}

3、web.xm配置过滤器

解决spring 处理request.getInputStream()输入流只能读取一次问题

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