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

时间:2022-01-07 18:10:39

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

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
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

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
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

?
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
<!--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>

(如果是Springboot,使用注解即可)

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

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