利用 ajax 上传图片删除图片 (Spring Boot)

约定不等于承诺〃 2023-06-12 09:43 10阅读 0赞

**效果如下：**

![2019111211153947.png][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MDM3MjY0_size_16_color_FFFFFF_t_70][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MDM3MjY0_size_16_color_FFFFFF_t_70 1][]

**1.启动类中****加****入**

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MDM3MjY0_size_16_color_FFFFFF_t_70 2][]

**SpringBoot重写addResourceHandlers映射文件路径**

@Override
    	 public void addResourceHandlers(ResourceHandlerRegistry registry) {
    	     registry.addResourceHandler("/imctemp-rainy/**").addResourceLocations("file:D:/E/");
    	 }

设置静态资源路径

2.   表单 前端 页面

$(function () {
    	    $("#button").click(function () {
    	        var form = new FormData();
    	        form.append("file", document.getElementById("file").files[0]);
    	         $.ajax({
    	             url: "/news/upload",        //后台url
    	             data: form,
    	             cache: false,
    	             async: false,
    	             type: "POST",                   //类型，POST或者GET
    	             dataType: 'json',              //数据返回类型，可以是xml、json等
    	             processData: false,
    	             contentType: false,
    	             success: function (data) {      //成功，回调函数
    	                 if (data) {
    	                	 var pic="/imctemp-rainy/"+data.fileName;
    	                	 alert(pic);
    	                 	 $("#url img").attr("src",pic);
    	                 	 // alert(JSON.stringify(data));
    	
    	                 } else {
    	                 	alert("失败");
    	                 }
    	                 
    	             },
    	             error: function (er) {          //失败，回调函数
    	            	 alert(JSON.stringify(data));
    	             }
    	         });
    	    });
    	    
    	    $("#t_button").click(function () {
                 //这里分割字符串 /imctemp-rainy/157352875235607c10257539a5f4dcdaab233ca2832a5.jpg
                 //需要用/分割字符先后获取最后一段字符串去上传到后台
             	 //alert($("#url img").attr("src"));
             	 var img = $("#url img").attr("src");
             	 var str = img.split("/");
             	 var str_img=str[str.length-1];
    		     //alert(str_img);
    	         $.post("/news/deleteImages",{filePath:str_img},function(data){
    	        	 alert(data);
                      //这里我们取消上传成功之后去给换成一个暂无图片的一个图
    	        	 $("#url img").attr("src","/imctemp-rainy/no.jpg");
    	         });
    	    });
    	})

**控制器**

public static void uploadFile(byte[] file, String filePath, String fileName) throws Exception {        
    			File targetFile = new File(filePath); 
    			if (!targetFile.exists()) {
    			   targetFile.mkdirs();    
    			}        
    			FileOutputStream out = new FileOutputStream(filePath +"/"+ fileName);
    			out.write(file);      
    			out.flush();   
    			out.close(); 
    	}
        //处理文件上传
      	@ResponseBody //返回json数据  
      	@RequestMapping(value = "upload", method = RequestMethod.POST) 
      	public JSONObject uploadImg(@RequestParam("file") MultipartFile file,HttpServletRequest request) {        
      	    String contentType = file.getContentType(); 
      	    //System.out.print(contentType);
      		String fileName = System.currentTimeMillis()+file.getOriginalFilename();
      		String filePath = "D:/E";
    	    JSONObject jo = new JSONObject();//实例化json数据
    
      		if (file.isEmpty()) {   
      			jo.put("success", 0);
      			jo.put("fileName", "");
      		}        
      		try {  
      		   uploadFile(file.getBytes(), filePath, fileName);  
      		   jo.put("success", 1);
      		   jo.put("fileName", fileName);
      		  // jo.put("xfileName", filePath+"/"+fileName);
      		} catch (Exception e) {  
      		// TODO: handle exception        
      	
      		}   
    		 
    
      		//返回json
      	    return jo;    
    
      	}    
      	
      	
      	@ResponseBody //返回json数据  
      	@RequestMapping("deleteImages")
      	public String deleteImages(HttpServletRequest request) {
      		String resultInfo = null;
      	    String filePath = request.getParameter("filePath");
            //这里是可以在控制器分割字符的一个方法
      	    //int lastIndexOf = filePath.lastIndexOf("/");
      	    //String sb = filePath.substring(lastIndexOf+1,filePath.length());
            //由于我们只获取了图片的名称并没有获取到所有的地址，，所以我们需要去给他进行添加存放图片的地址
      		File file = new File("D:/E/"+filePath);
      		if (file.exists()) {
    			if (file.delete()) {
    				resultInfo = "1-删除成功";
    			}else {
    				resultInfo = "0-删除失败";
    			}
    		}else {
    			resultInfo = "文件不存在！";
    		}
      		return resultInfo;
      	}

[2019111211153947.png]: https://img-blog.csdnimg.cn/2019111211153947.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MDM3MjY0_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20191112111551574.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MDM3MjY0,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MDM3MjY0_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20191112111554784.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MDM3MjY0,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MDM3MjY0_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20191110185425258.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM0MDM3MjY0,size_16,color_FFFFFF,t_70