继承HttpServletRequestWrapper自定义，重复消费请求参数

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原创最新推荐文章于 2026-08-10 13:23:23 发布 3.4k 阅读 AI 写同款· GEO 优化 ›

使用HttpServletRequestWrapper解决无法多次获取request Body的问题在使用AOP编程的时候，经常碰到需要多次获取整个请求的body的情况。例如：典型场景下我们要在AOP切面中做日志记录或权限校验，此时需要调用request.getInputStream获取输入流，从而读取整个请求的消息体。但是这通常会触发一个异常：java.lang.IllegalStateException: getInputStream() can't be called after getReader()。出现这个问题的原因是默认的HttpServletRequest对象中的getInputStr 阅读详情

package com.xxx.request;

import javax.servlet.ReadListener;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * @author coco
 * @date 2022/3/24
 */
public class MyHttpServletRequestWrapper extends HttpServletRequestWrapper {

    private final String body;

    public MyHttpServletRequestWrapper(HttpServletRequest request) throws IOException {
        super(request);
        InputStream is = null;
        StringBuilder sb = null;
        try {
            is = request.getInputStream();
            sb = new StringBuilder();
            byte[] b = new byte[4096];
            for (int n ; (n = is.read(b)) != -1;)
            {
                sb.append(new String(b, 0, n));
            }
        } finally {
            if(is != null) {
                is.close();
            }
        }
        body = sb.toString();
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream bais = new ByteArrayInputStream(body.getBytes());
        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();
            }

            @Override
            public void close() throws IOException {
                bais.close();
            }
        };
    }

    public String getBody() {
        return body;
    }
}

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