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

[email protected],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())); 
    } 
}
View Code

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"); 
    } 
}
View Code

3、web.xm配置过滤器

  <!--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>
View Code

 

(如果是Springboot,使用注解即可)

 

 

 

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