java使用字节流将本地图片传给前端

记录一下自己通过流来将本地图片传给前端.

当时参考的文章

JAVA使用字节流将本地图片传到前端_AIAS编程有道-CSDN博客

代码介绍

Service层

package com.sine.hbp.batchRequestManagement.service.impl;

import com.sine.hbp.batchRequestManagement.service.PictureServletService;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
@Service
public class PictureServletImpl implements PictureServletService {

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException {
        //使用字节流读取本地图片
        ServletOutputStream out=null;
        BufferedInputStream buf=null;
        //创建了一个文件对象,对应的填图片存放的路径(需要的请填写自己的)
        File file = new File("C:\\Users\\Administrator\\Desktop\\text.JPG");
        try {
            //使用输入读取缓冲流读取一个文件输入流
            buf = new BufferedInputStream(new FileInputStream(file));
            //利用respone获取一个字节流输出对象
            out = response.getOutputStream();
            //定义个数组,由于读取缓冲流的内容
            byte[] buffer = new byte[1024];
            //循环一直读取缓冲流中的内容到输出的对象中
            while (buf.read(buffer)!=-1){
                out.write(buffer);
            }
            //写出请求的地方
            out.flush();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            //关闭
            if (buf!=null) buf.close();
            if (out!=null) out.close();
        }


    }
}

Controller层

package com.sine.hbp.batchRequestManagement.controller;

import com.sine.common.controller.BaseController;
import com.sine.hbp.batchRequestManagement.service.PictureServletService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import sun.misc.BASE64Encoder;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;

@Controller
//写好对应的路径
@RequestMapping("/pictureServlet")
public class PictureServletController extends BaseController {

    @Autowired
    PictureServletService pictureServletService;

    @RequestMapping("/requestPicture")
    @ResponseBody
    //调用图片
    public void getBase64(HttpServletRequest request, HttpServletResponse response) {
        try {
            //调用doGet方法会抛出异常,捕获一下
            pictureServletService.doGet(request,response);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

前端代码

function loadQueryCondition() {
        $("#picture").attr("src",basePath + "/pictureServlet/requestPicture");
    }

 <img id="picture" width="110" height="160"  src=""></th>

这样就可以把图片在前端展示出来了.