JQuery 实现文件上传

时间：2014-10-24 19:18:07 阅读：181 评论：0 收藏：0 [点我收藏+]

标签：style blog http color io os ar 使用 java

简述：

实现前端使用jquery上传文件

后台用servlet处理文件上传以及保存

知识点：

1. 用到ajaxfileupload.js库

2. 后台servlet文件保存

其中ajaxfileupload的库下载地址：

http://www.phpletter.com/download_project_version.php?version_id=34

Maven中需要添加两个java的库，用来上传以及在服务器保存文件

[html] view plain copy

<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.2.2</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-io</artifactId>
<version>1.3.2</version>
</dependency>

项目结构（主要是js）

bubuko.com,布布扣

testUpload.html

[html] view plain copy

<!DOCTYPE html>
<head>
<title>MyWebProject</title>
<meta charset="utf-8" />
<link type="text/css" href="./lib/css/jquery-ui-1.8.19.custom.css"
rel="stylesheet" />
<link type="text/css" href="./lib/css/ajaxfileupload.css"
rel="stylesheet" />
<script type="text/javascript" src="./lib/js/jquery-1.8.3.js"></script>
<script type="text/javascript" src="./lib/js/ajaxfileupload.js"></script>
<script type="text/javascript">
function ajaxFileUpload() {
$.ajaxFileUpload({
url : "./UploadFile", //submit to UploadFileServlet
secureuri : false,
fileElementId : ‘fileToUpload‘,
dataType : ‘text‘, //or json xml whatever you like~
success : function(data, status) {
$("#result").append(data);
},
error : function(data, status, e) {
$("#result").append(data);
}
});
return false;
}
</script>
</head>
<body>
<form name="form" action="./UploadFile" method="POST" enctype="multipart/form-data">
<table class="tableForm">
<thead>
<tr>
<th>JQuery Ajax File Upload</th>
</tr>
</thead>
<tbody>
<tr>
<td><input id="fileToUpload" type="file" size="45"
name="fileToUpload" class="input"></td>
</tr>
</tbody>
<tfoot>
<tr>
<td><button class="button" id="buttonUpload"
onclick="return ajaxFileUpload();">Upload</button></td>
</tr>
</tfoot>
</table>
<div id="result" style="margin-left:200px"></div>
</form>
</body>
</html>

后台实现：

参考：http://blog.163.com/lin305_gf/blog/static/969524402011718102116625/

UploadFileServlet.java

[java] view plain copy

package mwp.servlet;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import javax.servlet.ServletException;
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.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Servlet implementation class UploadFileServlet
*/
public class UploadFileServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static Logger logger = LoggerFactory.getLogger(UploadFileServlet.class);
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
//判断提交过来的表单是否为文件上传菜单
boolean isMultipart= ServletFileUpload.isMultipartContent(request);
if(isMultipart){
//构造一个文件上传处理对象
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
Iterator items;
try{
//解析表单中提交的所有文件内容
items = upload.parseRequest(request).iterator();
while(items.hasNext()){
FileItem item = (FileItem) items.next();
if(!item.isFormField()){
//取出上传文件的文件名称
String name = item.getName();
//取得上传文件以后的存储路径
String fileName = name.substring(name.lastIndexOf(‘\\‘) + 1, name.length());
//上传文件以后的存储路径
String saveDir = this.getServletContext().getRealPath("/upload/");
if (!(new File(saveDir).isDirectory())){
new File(saveDir).mkdir();
}
String path= saveDir + File.separatorChar + fileName;
//上传文件
File uploaderFile = new File(path);
item.write(uploaderFile);
}
}
}catch(Exception e){
e.printStackTrace();
response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
return;
}
response.setStatus(HttpServletResponse.SC_OK);
response.getWriter().append("Success Upload");
}
}
}