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
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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()));
}
}
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2、自定义 MyFilter 继承Filter
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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" );
}
}
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3、web.xm配置过滤器
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<!--定义过滤器-->
< filter >
<!--定义过滤器拦截URL地址-->
< filter-name >test2</ filter-name >
<!--过滤器的文件-->
< filter-class >com.zhhy.hy2000interface.utils.filter.MyFilter</ filter-class >
</ filter >
< filter-mapping >
<!--过滤器的名称-->
< filter-name >test2</ filter-name >
<!--过滤器负责拦截的URL-->
<!-- /* 会把所有的请求拦截下来 -->
< url-pattern >/*</ url-pattern >
</ filter-mapping >
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(如果是Springboot,使用注解即可)
以上这篇解决spring 处理request.getInputStream()输入流只能读取一次问题就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:https://www.cnblogs.com/weibanggang/p/13180469.html