Java 使用ajax实现文件上传

使用ajax实现文件上传

https://blog.csdn.net/qq_42944520/article/details/84572509

记忆不太好,在这里写一写利用ajax实现文件上传.方便以后查看,正好和大家分享分享…
直接上代码吧!
html代码:

<input type="file" name="fileName1" id="fileName1"/>
<input type="button" onclick="sendToUser()" id="sendToUser" value="提交" />
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js代码:

		function sendToUser(){ //在这里进行ajax 文件上传 用户的信息 
			var $file1 = $("input[name='fileName1']").val();//用户文件内容(文件)
			// 判断文件是否为空 
			if ($file1 == "") {
				alert("请选择上传的目标文件! ")
				return false;
			}
			//判断文件类型,我这里根据业务需求判断的是Excel文件
			var fileName1 = $file1.substring($file1.lastIndexOf(".") + 1).toLowerCase();
			if(fileName1 != "xls" && fileName1 !="xlsx"){
              	alert("请选择Execl文件!");				
				return false;
			}
			//判断文件大小
			var size1 = $("input[name='fileName1']")[0].files[0].size;
			if (size1>104857600) {
				alert("上传文件不能大于100M!");
				return false;				
			}

		boo1 <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
	<span class="token keyword">var</span> type <span class="token operator">=</span> <span class="token string">"file"</span><span class="token punctuation">;</span>
	<span class="token keyword">var</span> formData <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">FormData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//这里需要实例化一个FormData来进行文件上传</span>
	formData<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>type<span class="token punctuation">,</span><span class="token function">$</span><span class="token punctuation">(</span><span class="token string">"#fileName1"</span><span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span>files<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token comment">//多文件上传在这里继续append</span>
	<span class="token comment">//eg : </span>
	<span class="token comment">//formData.append(type,$("#fileName1")[0].files[0]);</span>
	$<span class="token punctuation">.</span><span class="token function">ajax</span><span class="token punctuation">(</span><span class="token punctuation">{<!-- --></span>
		type <span class="token punctuation">:</span> <span class="token string">"post"</span><span class="token punctuation">,</span>
		url <span class="token punctuation">:</span> <span class="token string">"uploadToFile"</span><span class="token punctuation">,</span>
		data <span class="token punctuation">:</span> formData<span class="token punctuation">,</span>
		processData <span class="token punctuation">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
		contentType <span class="token punctuation">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
		success <span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">{<!-- --></span>
			<span class="token keyword">if</span> <span class="token punctuation">(</span>data<span class="token operator">==</span><span class="token string">"error"</span><span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
				<span class="token function">alert</span><span class="token punctuation">(</span><span class="token string">"文件提交失败!"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{<!-- --></span>
			<span class="token function">$</span><span class="token punctuation">(</span><span class="token string">"input[name='userUrl']"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">val</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token function">alert</span><span class="token punctuation">(</span><span class="token string">"文件上传成功!"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span><span class="token punctuation">}</span>
	<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>


		boo1 <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
	<span class="token keyword">var</span> type <span class="token operator">=</span> <span class="token string">"file"</span><span class="token punctuation">;</span>
	<span class="token keyword">var</span> formData <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">FormData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">//这里需要实例化一个FormData来进行文件上传</span>
	formData<span class="token punctuation">.</span><span class="token function">append</span><span class="token punctuation">(</span>type<span class="token punctuation">,</span><span class="token function">$</span><span class="token punctuation">(</span><span class="token string">"#fileName1"</span><span class="token punctuation">)</span><span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span>files<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token comment">//多文件上传在这里继续append</span>
	<span class="token comment">//eg : </span>
	<span class="token comment">//formData.append(type,$("#fileName1")[0].files[0]);</span>
	$<span class="token punctuation">.</span><span class="token function">ajax</span><span class="token punctuation">(</span><span class="token punctuation">{<!-- --></span>
		type <span class="token punctuation">:</span> <span class="token string">"post"</span><span class="token punctuation">,</span>
		url <span class="token punctuation">:</span> <span class="token string">"uploadToFile"</span><span class="token punctuation">,</span>
		data <span class="token punctuation">:</span> formData<span class="token punctuation">,</span>
		processData <span class="token punctuation">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
		contentType <span class="token punctuation">:</span> <span class="token boolean">false</span><span class="token punctuation">,</span>
		success <span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">{<!-- --></span>
			<span class="token keyword">if</span> <span class="token punctuation">(</span>data<span class="token operator">==</span><span class="token string">"error"</span><span class="token punctuation">)</span> <span class="token punctuation">{<!-- --></span>
				<span class="token function">alert</span><span class="token punctuation">(</span><span class="token string">"文件提交失败!"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token punctuation">}</span><span class="token keyword">else</span><span class="token punctuation">{<!-- --></span>
			<span class="token function">$</span><span class="token punctuation">(</span><span class="token string">"input[name='userUrl']"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">val</span><span class="token punctuation">(</span>data<span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token function">alert</span><span class="token punctuation">(</span><span class="token string">"文件上传成功!"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span><span class="token punctuation">}</span>
	<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>

使用springboot项目进行接收上传文件
controller层:

    /**
     * 上传数据文件
     *  多文件上传这里使用 MultipartFile[] files接受即可
     * @author : lichenfei
     * @date : 2018年11月22日
     * @time : 下午2:46:29
     * @return @
     */
    @RequestMapping("/uploadToFile")
    @ResponseBody
    public String uploadToUser(@RequestParam("file") MultipartFile file, HttpServletRequest req, Model model) {
	String fileName = file.getOriginalFilename();
	if (fileName.indexOf("\\") != -1) {
	    fileName = fileName.substring(fileName.lastIndexOf("\\"));
	}
	// 获取文件存放地址
	String filePath = dataPath;
	File f = new File(filePath);
	if (!f.exists()) {
	    f.mkdirs();// 不存在路径则进行创建
	}
	FileOutputStream out = null;
	try {
	    // 重新自定义文件的名称
	    Date date = new Date();
	    SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");
	    String d = sdf.format(date);// 时间
	    filePath = filePath + d + fileName;
	    out = new FileOutputStream(filePath);
	    out.write(file.getBytes());
	    out.flush();
	    out.close();
	} catch (Exception e) {
	    return "error";
	}
	return filePath; // 返回文件地址
    }
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新人一枚,有什么问题希望多多指导!