org.apache.inlong.manager.web.trace.ResponseWrapper Maven / Gradle / Ivy

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.inlong.manager.web.trace;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * Response wrapper
 * Used to wrap HttpServletResponse, and do some extra processing or recording when getting the response data.
 */
public class ResponseWrapper extends HttpServletResponseWrapper {

    private final ByteArrayOutputStream buffer;
    private final ServletOutputStream out;
    private final PrintWriter writer;

    public ResponseWrapper(HttpServletResponse response) throws IOException {
        super(response);
        buffer = new ByteArrayOutputStream();
        out = new WrapperOutputStream(buffer, response);
        writer = new WrapperWriter(buffer, response);
    }

    @Override
    public ServletOutputStream getOutputStream() throws IOException {
        return out;
    }

    @Override
    public PrintWriter getWriter() {
        return writer;
    }

    /**
     * Gets the string form of response data.
     * @return Return the string form of response data.
     * @throws IOException
     */
    public String getContent() throws IOException {
        flushBuffer();
        return buffer.toString();
    }
}