一般我們會在InterceptorAdapter攔截器中對請求進行驗證
正常普通接口請求，request.getParameter()可以獲取，能多次讀取
如果我們的接口是用@RequestBody來接受數據，那么我們在攔截器中
需要讀取request的輸入流 ，因為 ServletRequest中getReader()和getInputStream()只能調用一次
這樣就會導致controller 無法拿到數據。
解決方法 ：
1、自定義一個類 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;//用于將流保存下來 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、自定義 MyFilter 繼承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("開始"); } @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("------------------------------請求報文----------------------------------"); System.out.println(getParamsFromRequestBody((HttpServletRequest) requestWrapper)); System.out.println("------------------------------請求報文----------------------------------"); chain.doFilter(requestWrapper, response); } } /* * * 獲取請求體內容 * @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配置過濾器
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
|
<!--定義過濾器--> <filter> <!--定義過濾器攔截URL地址--> <filter-name>test2</filter-name> <!--過濾器的文件--> <filter-class>com.zhhy.hy2000interface.utils.filter.MyFilter</filter-class> </filter> <filter-mapping> <!--過濾器的名稱--> <filter-name>test2</filter-name> <!--過濾器負責攔截的URL--> <!-- /* 會把所有的請求攔截下來 --> <url-pattern>/*</url-pattern> </filter-mapping> |
（如果是Springboot，使用注解即可）
以上這篇解決spring 處理request.getInputStream()輸入流只能讀取一次問題就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持服務器之家。
原文鏈接：https://www.cnblogs.com/weibanggang/p/13180469.html
