spring boot 图片上传与显示（二）

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spring boot 图片上传与显示（二）

创建个uril包，用于存放工具类，这个方法，便于后期的代码维护。

先在启动类（Application.java）中创建虚拟路径

package com.sdbairui.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@SpringBootApplication
public class DemoApplication implements WebMvcConfigurer {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry){
        /*
            addResoureHandler：指的是对外暴露的访问路径
            addResourceLocations：指的是内部文件放置的目录
        */
        registry.addResourceHandler("/imctemp-rainy/**").addResourceLocations("file:D:/Intellij IDEA/IntelliJ IDEA 2020.1/SpringBoot/Test/src/main/resources/static/");
    }
}

util包下的uploadutil.java

package com.sdbairui.demo.Util;

import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;

public class UploadUtil {
    //源文件名
    private String originalFilename;

    //源文件后缀名
    private String suffix;

    //存入数据库里的tomcat虚拟路径
    private String dbPath;

    //文件大小
    private long size;

    //实际存储路径
    private String realPath;

    /**
     * 文件上传工具类
     * @param attach
     * @param request
     * @param uploader 文件上传者
     * @return
     */
    public boolean doUpload(MultipartFile attach, HttpServletRequest request, String uploader){

        if(!attach.isEmpty()){

            originalFilename = attach.getOriginalFilename();
            System.out.println("==>上传的文件名："+originalFilename);

            suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
            System.out.println("==>上传的文件后缀名："+suffix);

            size = attach.getSize();
            System.out.println("==>上传文件的大小："+size);

            String currentFilename = System.currentTimeMillis()+ UUID.randomUUID().toString() + suffix;
            System.out.println("==>存储的上传文件名："+currentFilename);

            realPath = "D:/Intellij IDEA/IntelliJ IDEA 2020.1/SpringBoot/Test/src/main/resources/static/"+uploader ;
            System.out.println("==>上传文件保存的真实路径："+realPath);

            File targetFile = new File(realPath, currentFilename);
            if(!targetFile.exists()){
                targetFile.mkdirs();
            }

            try{
                attach.transferTo(targetFile);
            }catch (Exception e){
                e.printStackTrace();
                return false;
            }
            realPath = realPath + "/" + currentFilename;
//            dbPath =  request.getContextPath() + "/" + uploader + "/" + new SimpleDateFormat("yyyy-MM-dd").format(new Date()) + "/" + currentFilename;
            dbPath = "/" + uploader + "/" + currentFilename;
            return true;
        }else{
            return false;
        }
    }
    public String getUploadFile(){
        return dbPath;
    }
}

控制类（Controller）

@RequestMapping(value = "/upload",method = RequestMethod.POST)
@ResponseBody
public String testUpload(@RequestParam("file")MultipartFile file,HttpServletRequest request) {

    UploadUtil uploadUtil = new UploadUtil();
    String fileName = "";
    if (uploadUtil.doUpload(file, request, "uploadImg")) {
        fileName = uploadUtil.getUploadFile();
    } else {
        fileName = "file";
    }

    return fileName;
}

前端界面

上传图片，我用的是JavaScript的Ajax 的方式进行上传的

这个是表单内容
 <div class="int">
        <input type="file" name="sname" id="file"><br> <!-- file书写浏览上传的文件-->
        <!--接受显示上传图片的路径，作用是将图片的路径上传到后台服务器端，来达到上传图片的效果-->
        <input type="text" name="file" id="sfile">
        <!-- 显示上传图片的内容 -->
        <p id="url"><img src="" width="130" height="80"></p>
        <input type="button" value="上传" id="upload">
        <input type="button" value="取消" id="clean"> <br>
    </div>

这个是Ajax代码
$("#upload").click(function () {
            // 获取表单内容
            var form =new FormData();
            // 将表单内容，通过数组记录下来
            form.append("file",document.getElementById("file").files[0]);
            $.ajax({
                url: "/person/upload",
                data: form,
                cache: false,
                async: false,
                type: 'post',
                dataType: 'text',
                processData: false,
                contentType: false,
                success:function (data) {
                    // 成功时，提示的后台JSON数据
                    // alert(JSON.stringify(data));
                    if(data){
                        $("#url img").attr("src","/imctemp-rainy/"+ data);
                        $("#sfile").val("/imctemp-rainy/"+ data);
                        // $("#url img").attr("src","/imctemp-rainy/"+data);
                        // var pic=data
                        // // 将上传图片存入内部磁盘当中
                        //  $("#url img").attr("src",pic);
                        // // 将上传的图片路径保存在id为sfile当中
                        // $("#sfile").val("/imctemp-rainy/"+data.fileName);
                    }
                },
            })
        })
    });

index.html(显示)

<td ><img th:src="@{${person.file}}" height="80" width="130"></td>