ajaxFileUpload 异步上传文件

前端处理

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<Meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>

<!-- 引用jquery -->
<script src="//code.jquery.com/jquery-1.11.0.min.js"></script>
<script src="//code.jquery.com/jquery-migrate-1.2.1.min.js"></script>

<!-- 引用ajaxfileupload.js -->
<script src="../js/ajaxfileupload.js"></script>

<script type="text/javascript">
$(function(){
	//点击打开文件选择器
	$("#upload").on('click',function() {
		$('#fileToUpload').click();
	});
	
	//选择文件之后执行上传
	$('#fileToUpload').on('change',function() {
		$.ajaxFileUpload({
			url:'../FileUploadServlet',secureuri:false,fileElementId:'fileToUpload',//file标签的id
			dataType: 'json',//返回数据的类型
			data:{name:'logan'},//一同上传的数据
			success: function (data,status) {
				//把图片替换
				var obj = jQuery.parseJSON(data);
				$("#upload").attr("src","../image/"+obj.fileName);
	
				if(typeof(data.error) != 'undefined') {
					if(data.error != '') {
						alert(data.error);
					} else {
						alert(data.msg);
					}
				}
			},error: function (data,status,e) {
				alert(e);
			}
		});
	});
	
});
</script>

</head>
<body>

<!-- 点击图片，打开文件选择器，确定，上传。(这是网络上的一个图片) -->
<img id="upload" alt="" style="width: 200px; height: 200px"
 	src="http://d.pcs.baidu.com/thumbnail/e8119cd92364a9b2714ea0a92af15aec?fid=2399642819-250528-305026848845811&time=1405674000&sign=FDTAER-DCb740ccc5511e5e8fedcff06b081203-abo3xnZkLb7yMEPLDWiuaQI8kXM%3D&rt=sh&expires=2h&r=900585425&sharesign=unknown&size=c710_u500&quality=100">

<!-- 隐藏file标签 -->
<input id="fileToUpload" style="display: none" type="file" name="upfile"><br/>
  
</body>
</html>

后台处理

package com.yangshidesign.weixinface.servlet;

import java.io.File;
import java.io.IOException;
import java.util.List;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import com.alibaba.fastjson.JSONObject;

/**
 * Servlet implementation class FileUploadServlet
 */
@WebServlet("/FileUploadServlet")
public class FileUploadServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException {
		response.getWriter().println("ppppppppppppppppppp");
	}

	protected void doPost(HttpServletRequest request,IOException {
		//需要返回的fileName
		String fileName = null;
		
		//参考资料  http://commons.apache.org/proper/commons-fileupload/using.html
		// Check that we have a file upload request
		boolean isMultipart = ServletFileUpload.isMultipartContent(request);
		
		// Create a factory for disk-based file items
		DiskFileItemFactory factory = new DiskFileItemFactory();

		// Configure a repository (to ensure a secure temp location is used)
		ServletContext servletContext = this.getServletConfig().getServletContext();
		File repository = (File) servletContext.getAttribute("javax.servlet.context.tempdir");
		factory.setRepository(repository);

		// Create a new file upload handler
		ServletFileUpload upload = new ServletFileUpload(factory);

		// Parse the request
		try {
			List<FileItem> items = upload.parseRequest(request);
			for(FileItem item : items) {
				//其他参数
				String type = item.getContentType();
				if(type == null) {
//					System.out.println(item.getString(item.getFieldName()));
					continue;
				}
				
				//文件参数
				fileName = item.getName();
				
				//设置保存文件路径
				String realPath = request.getServletContext().getRealPath("/image");
				File dir = new File(realPath);
				File f = new File(dir,fileName);
				
				if(f.exists()) {
					f.delete();
				}
				f.createNewFile();
				
				//保存
				item.write(f);
				
			}
		} catch (FileUploadException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		//返回结果
		JSONObject obj = new JSONObject();
		obj.put("fileName",fileName);
		response.getWriter().print(obj.toJSONString());
	}

}

需要用到的一个js文件：（点击下载）

ajaxfileupload.js

两个jar包：

commons-io-2.4.jar

commons-fileupload-1.3.1.jar

注意：上传成功之后没有执行回调函数。

解决方法：（参考链接：http://www.myexception.cn/ajax/727453.html）

打开ajaxfileupload.js拉到底下找到

[javascript]view plaincopy 
   
 if(type=="json"){
 eval("data="+data);
 }

改成：

copy 
    
   

ajaxFileUpload 异步上传文件

前端处理

后台处理

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