解决request.getInputStream()只能获取一次问题

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解决request.getInputStream()只能获取一次问题

不废话直接上代码

代码示例

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;
public class BodyReaderHttpServletRequestWrapper extends HttpServletRequestWrapper {
    private byte[] body;
    public BodyReaderHttpServletRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        try {
            body = StreamUtils.getByteByStream(request.getInputStream());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(getInputStream()));
    }
    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream bais = new ByteArrayInputStream(body);
        return new ServletInputStream() {
            @Override
            public int read() throws IOException {
                return bais.read();
            }
            @Override
            public boolean isFinished() {
                // TODO Auto-generated method stub
                return false;
            }
            @Override
            public boolean isReady() {
                // TODO Auto-generated method stub
                return false;
            }
            @Override
            public void setReadListener(ReadListener listener) {
                // TODO Auto-generated method stub
            }
        };
    }
}

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import org.springframework.context.annotation.Configuration;
@Configuration
public class HttpServletRequestReplacedFilter implements Filter {  
    @Override  
    public void init(FilterConfig filterConfig) throws ServletException {  
        //Do nothing
    }  
    @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(null == requestWrapper) {  
            chain.doFilter(request, response);  
        } else {  
            chain.doFilter(requestWrapper, response);  
        }  
    }  
    @Override  
    public void destroy() {  
        //Do nothing
    }  
}  

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
public class StreamUtils {
    public static byte[] getByteByStream(InputStream is) throws Exception {
        byte[] buffer = new byte[1024];
        int len = 0;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while ((len = is.read(buffer)) != -1) {
            bos.write(buffer, 0, len);
        }
        bos.flush();
        return bos.toByteArray();
    }
}

（完）

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