关于JavaWeb SpringMVC框架实现上传以及在前端jsp页面显示二进制图片问题解决

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    @RequestMapping("/imageupload.action")
    //@ResponseBody
    public String searchMember(@RequestParam(value = "file")MultipartFile file,NXSY image){
        try {
            InputStream ins = file.getInputStream();
            byte[] buffer=new byte[1024];
            int len=0;
            ByteArrayOutputStream bos=new ByteArrayOutputStream();
            while((len=ins.read(buffer))!=-1){
                bos.write(buffer,0,len);
            }
            bos.flush();
            byte data[] = bos.toByteArray();

       
            image.setImg(data);
            image.setDate(image.getDate());
            image.setTitle(image.getTitle());
            //image.setImage("/testimage");
            int result = this.nxsyService.addImg(image);
            
            return "admin2";
    /*　　　　　　　Student s=new Student();
    　　　　　　　s.setId(sId);
    　　　　　　　s.setPhoto(data);
    　　　　　　　studentService.insertPhoto(s);*/
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return "admin2";

    }
    
    
    
    
    
    
    @RequestMapping(value = "/showimage",produces = MediaType.IMAGE_JPEG_VALUE)
    @ResponseBody
    public byte[] toImageShow(NXSY nx){
//这里是从数据库读取图片，你可以根据自己的业务读取你的数据
        NXSY image =this.nxsyService.findOne(nx.getId());
        return image.getImg();
    }

package com.hts.controller;

import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Blob;
import java.sql.SQLException;
import java.util.List;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.swing.ImageIcon;
import javax.swing.JLabel;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import com.hts.po.NXSY;
import com.hts.service.NXSYService;

import sun.misc.BASE64Decoder;

@Controller
public class NXSYController {

    @Autowired
    private NXSYService nxsyService;
    
    
    
    
    // 跳转到首页
    @RequestMapping(value = "/index.action")
    public String toindex(Model model, NXSY n) {
        List<NXSY> nx = this.nxsyService.findAll(n);
        
        NXSY O = this.nxsyService.findFirst(n);
        
        model.addAttribute("O", O);
        model.addAttribute("NX", nx);
        return "index";
    }
    
    
    //搜索
    @RequestMapping(value = "/find.action")
    public String find(Model model, String title,String date) {
        List<NXSY> nx = this.nxsyService.find(title,date);
    
        model.addAttribute("NX", nx);
        return "index";
    }
    
    
    
//    //搜索日期
//    @RequestMapping(value = "/findtime.action")
//    public String findtime(Model model, String date) {
//        List<NXSY> nx = this.nxsyService.findtime(date);
//        
//        model.addAttribute("NX", nx);
//        return "index";
//    }
    
    

    
    // 单个显示

    @RequestMapping(value = "/findOne.action")
    public String findOne(Model model, HttpServletResponse response, NXSY nx) throws IOException, SQLException {

        NXSY one = this.nxsyService.findOne(nx.getId());

        List<NXSY> nxx = this.nxsyService.find(nx.getTitle(),nx.getDate());

    

        model.addAttribute("NX", nxx);
        model.addAttribute("O", one);

        return "index";
    }

    
    
}

package com.hts.po;

import java.sql.Blob;
import java.util.Arrays;

public class NXSY {
    private Integer id;//排序
    private String title;//标题
    private byte[] img;//图片
    private String date;//日期
    
    private String image;//图片路径
    
    
    
    
    public String getImage() {
        return image;
    }
    public void setImage(String image) {
        this.image = image;
    }
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public byte[] getImg() {
        return img;
    }
    public void setImg(byte[] img) {
        this.img = img;
    }
    public String getDate() {
        return date;
    }
    public void setDate(String date) {
        this.date = date;
    }
    @Override
    public String toString() {
        return "NXSY [id=" + id + ", title=" + title + ", img=" + Arrays.toString(img) + ", date=" + date + "]";
    }

    
    
    

}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" 
 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.hts.dao.NXSYDao"><!--命名空间属性，用于对sql分类化管理 ，来实现不同业务的隔离 -->

    <!--parameterType接收输入参数类型String -->
    <!--resultType查询得到的结果的类型（输出参数的类型） -->

    <select id="findAll" parameterType="String" resultType="NXSY">
        select top(10) * FROM  nxsy order by id desc
            
    </select>
    
    <select id="findFirst" parameterType="String" resultType="NXSY">
        select top(1) * FROM  nxsy order by id desc
            
    </select>

    <select id="find" parameterType="String" resultType="NXSY">
        SELECT * FROM  nxsy
        <where>
            <if test="title != null and title != '' ">
                <bind name="title" value=" '%'+title+'%' " />
                title like #{title}
            </if>
            
            <if test="date != null and date != '' ">
                
                and date = #{date}
            </if>

        </where>
            order by id desc
    </select>
    
    
    <select id="findtime" parameterType="String" resultType="NXSY">
        SELECT * FROM  nxsy where date =#{date} order by id desc
            
    </select>
        
    <select id="findOne" parameterType="Integer" resultType="NXSY">
        SELECT * FROM  nxsy where id =#{id}
            
    </select>
    
    
    <insert id="addImg" parameterType="NXSY">
    
    insert into nxsy(title,img,date,image) values (#{title},#{img},#{date},#{image});
    
    </insert>
    
</mapper>

package com.hts.dao;

import java.util.List;

import org.apache.ibatis.annotations.Param;

import com.hts.po.NXSY;

public interface NXSYDao {

    List<NXSY> findAll(NXSY n);
    
    NXSY findFirst(NXSY n);
    
    List<NXSY> find(@Param("title") String title ,@Param("date") String date);
    
    List<NXSY> findtime(@Param("date") String date);
    
    NXSY findOne(@Param("id") Integer id);
    
    int addImg(NXSY nx);
}

Service层以及ServiceImpl层在此省略

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<link rel="stylesheet" type="text/css" href="css/bootstrap.min.css" />
<script src="js/bootstrap.min.js"></script>

<link rel="stylesheet" type="text/css" href="css/sousuo.css" />

<style type="text/css">
</style>
<title></title>
</head>
<body>

    <form action="${pageContext.request.contextPath }/find.action"
        class="form-inline">
        <nav class="navbar navbar-light bg-light" style="text-align: center;">

            <input type="date" name="date" id="date"
                style="width: 272px; text-align: center; font-size: 30px; font-family: '楷体'; height: 50px;" />

            <input class="form-control mr-sm-2" type="text" name="title"
                placeholder="搜索内容内容为空时则为搜索全部" aria-label="Search" id="title"
                style="width: 800px; text-align: center; height: 60px;" autocomplete="on">
                

            <button class="btn btn-outline-success my-2 my-sm-0" type="submit"
                style="height: 60px; width: 150px; font-size: 25px;">搜索</button>

        </nav>
    </form>
    <!--
    <form action="${pageContext.request.contextPath }/findtime.action"
        class="form-inline">
        <div style="margin-left: 20px;margin-top: -30px">
            <input type="date" name="date"
                style="width: 272px; text-align: center; font-size: 20px; font-family: '楷体';" />
             <button type="submit" style="height: 36px; width: 70px;">检索日期</button> 
        </div>
    </form>
        <br /><br />
    -->
    <div
        style="margin-left: 20px; width: 350px; font-size: 20px; font-family: '楷体';">

        <!-- <button style="width: 450px;height: 100px;font-size: 20px;border: 0.5px solid black;">sss</button> <br /><br /> -->

        <c:forEach items="${NX}" var="n">
            <a class="btn-draw"
                href="${pageContext.request.contextPath }/findOne.action?id=${n.id}">
                <!-- 重定向到该页面 --> <span>${n.title }<br />
                    <p style="font-size: 15px;">${n.date }</p>
            </span>
            </a>
            <br />
            <br />
        </c:forEach>


    </div>



    <div style="text-align: center;">
        <!--<img src="upload/${O.image}" class="img-fluid" alt="Responsive image"
            style="max-width: 100%; position: fixed; left: 500px; top: 100px;">
        background-size:100% 100%;width: 50% -->
        
    <img src="${pageContext.request.contextPath }/showimage.action?id=${O.id}"style="max-width: 100%; position: fixed; left: 500px; top: 100px;" alt="失败" />

        
    </div>






</body>



</html>

网上找的大部分的都不能直接用，缺这缺那的，不过皇天不负有心人，对一个有所启发，灵感源于https://www.cnblogs.com/Anxc/p/12462549.html，要是这人是个女的，我都想抱着亲一口了，解决我大问题了，以上希望能帮助到你。

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