java 模拟ajax上传图片

1、maven 引入依赖

　　

	<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpmime -->

<dependency>

    <groupId>org.apache.httpcomponents</groupId>

    <artifactId>httpmime</artifactId>

    <version>4.5.2</version>

</dependency>

	<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpcore -->

<dependency>

    <groupId>org.apache.httpcomponents</groupId>

    <artifactId>httpcore</artifactId>

    <version>4.4.9</version>

</dependency>

　　

　2、

@RequestMapping("upload")

	public ResultMessage upload(HttpServletRequest request,HttpServletResponse response,

			@RequestParam(name="userid",required=false)String userid,

			@RequestParam(name="bid",required=false)String bid,

			@RequestParam(name="pid",required=false)String pid,

			@RequestParam(name="reportNumber",required=false)String reportNumber,

			@RequestParam(name="plateNumber",required=false)String plateNumber,

			@RequestParam("file") MultipartFile file) throws IllegalStateException, IOException{

		String filename=file.getOriginalFilename();

    	String extensionName = filename.substring(filename.lastIndexOf(".") + 1);

    	String imgPath = System.currentTimeMillis() + "." +extensionName;

        String filePath = request.getSession().getServletContext().getRealPath("/")+"uploadimages\\";

        File newfile =  new File(filePath);

        if(!newfile.exists()){

        	newfile.mkdirs();

        }

        file.transferTo(new File(filePath+imgPath));

		HttpClient client = new DefaultHttpClient();

		HttpPost post= new HttpPost("");

		MultipartEntity muti = new MultipartEntity();

		File newfile1 = new File(filePath+imgPath);

		FileBody body = new FileBody(newfile1);

		muti.addPart("file",body);

		muti.addPart("userid", new StringBody(userid));

		muti.addPart("pid", new StringBody(pid));

		muti.addPart("bid", new StringBody(bid));

		muti.addPart("reportNumber", new StringBody(reportNumber));

		muti.addPart("plateNumber", new StringBody(plateNumber));

		post.setEntity(muti);

		try {

			HttpResponse resp = client.execute(post);

			if(resp.getStatusLine().getStatusCode()==HttpStatus.SC_OK){

				return ResultMessage.getSuccess().setData(EntityUtils.toString(resp.getEntity()));

			}

		}catch (IOException e) {

			logger.info(e.getMessage(),e);

		}

		return ResultMessage.getFail();

	}

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpmime --><dependency>    <groupId>org.apache.httpcomponents</groupId>    <artifactId>httpmime</artifactId>    <version>4.5.2</version></dependency>