package com.nokia.financeapi.config.web;

import javax.servlet.ServletOutputStream;
import javax.servlet.WriteListener;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

/**
 * 解决流只能读取一次问题
 */
public class MyHttpServletResponseWrapper extends HttpServletResponseWrapper {
    private ByteArrayOutputStream byteArrayOutputStream;
    private ServletOutputStream servletOutputStream;

    public MyHttpServletResponseWrapper(HttpServletResponse response) {
        super(response);
        byteArrayOutputStream = new ByteArrayOutputStream();
        servletOutputStream = new ServletOutputStream() {
            @Override
            public boolean isReady() {
                return false;
            }

            @Override
            public void setWriteListener(WriteListener writeListener) {
                //
            }

            @Override
            public void write(int b) throws IOException {
                response.getOutputStream().write(b);
                byteArrayOutputStream.write(b);
            }
        };
    }

    @Override
    public ServletOutputStream getOutputStream() {
        return servletOutputStream;
    }

    public byte[] toByteArray() {
        return byteArrayOutputStream.toByteArray();
    }
}