response中的字节流使用的案例

2023-09-03

导入字节工具包，可以用于复制输入流与输出流

<dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-io</artifactId>
      <version>1.3.2</version>
</dependency>

案例

package com.hh.response; /**
 * @author hh
 * @version 1.0
 * @DATE 2023-09-03 13:32:10
 */

import org.apache.commons.io.IOUtils;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/resp4")
public class ResponseServlet4 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //读取文件到内存
        FileInputStream inputStream = new FileInputStream("E:\\下载\\2.jpg");

        ServletOutputStream outputStream = response.getOutputStream();
        IOUtils.copy(inputStream,outputStream);
       inputStream.close();



    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }
}