使用ServletInputStream在拦截器或过滤器中应用后重写

ServletInputStream inputStream = super.getInputStream();
StringBuilder sb = new StringBuilder();
BufferedReader reader = null;
try {
    reader = new BufferedReader(new InputStreamReader(servletInputStream, Charset.forName("UTF-8")));
    String line = "";
    while ((line = reader.readLine()) != null) {
          sb.append(line);
    }
} catch (IOException e) {
    e.printStackTrace();
} finally {
    if (servletInputStream != null) {
       try {
           servletInputStream.close();
       } catch (IOException e) {
           e.printStackTrace();
       }
    }
    if (reader != null) {
         try {
              reader.close();
         } catch (IOException e) {
              e.printStackTrace();
         }
    }
}
//使用ServletInputStream中数据的代码
byte[] bytes = sb.getBytes("UTF-8");
final ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
return new ServletInputStream() {
       @Override
       public boolean isFinished() {
               return false;
       }
 
        @Override
        public boolean isReady() {
               return false;
        }
 
        @Override
        public void setReadListener(ReadListener readListener) {
 
        }
 
        @Override
        public int read() throws IOException {
               return bais.read();
        }
};

 
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
 
@WebFilter(urlPatterns = "/*", filterName = "channelFilter")
public class ChannelFilter implements Filter {
	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
	}
 
	@Override
	public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
			throws IOException, ServletException {
		ServletRequest requestWrapper = null;
		if (servletRequest instanceof HttpServletRequest) {
			requestWrapper = new RequestWrapper((HttpServletRequest) servletRequest);
		}
		if (requestWrapper == null) {
			filterChain.doFilter(servletRequest, servletResponse);
		} else {
			System.out.println("进入了过滤器。。。。。");
			filterChain.doFilter(requestWrapper, servletResponse);
		}
	}
 
	@Override
	public void destroy() {
	}
}

 
import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.*;
 
public class RequestWrapper extends HttpServletRequestWrapper { 
	private final String body; 
	public RequestWrapper(HttpServletRequest request) {
		super(request);
		StringBuilder stringBuilder = new StringBuilder();
		BufferedReader bufferedReader = null;
		InputStream inputStream = null;
		try {
			inputStream = request.getInputStream();
			if (inputStream != null) {
				bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
				char[] charBuffer = new char[128];
				int bytesRead = -1;
				while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
					stringBuilder.append(charBuffer, 0, bytesRead);
				}
			} else {
				stringBuilder.append("");
			}
		} catch (IOException ex) {
		} finally {
			if (inputStream != null) {
				try {
					inputStream.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if (bufferedReader != null) {
				try {
					bufferedReader.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		body = stringBuilder.toString();
	} 
	@Override
	public ServletInputStream getInputStream() throws IOException {
		final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body.getBytes());
		ServletInputStream servletInputStream = new ServletInputStream() {
			@Override
			public boolean isFinished() {
				return false;
			}
 
			@Override
			public boolean isReady() {
				return false;
			}
 
			@Override
			public void setReadListener(ReadListener readListener) {
			}
 
			@Override
			public int read() throws IOException {
				return byteArrayInputStream.read();
			}
		};
		return servletInputStream;
	}
 
	@Override
	public BufferedReader getReader() throws IOException {
		return new BufferedReader(new InputStreamReader(this.getInputStream()));
	} 
	public String getBody() {
		return this.body;
	}
}