springmvc入门基础之文件上传

MayMatrix 2014-04-03

 一、表单上传

1、引入jar:

  • apache.commons-fileupload-1.3.jar
  • apache.commons.io-2.4.0.jar 

2、修改springmvc配置

<!-- id="multipartResolver"必须是multipartResolver -->
<bean id="multipartResolver"
	class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
	<!-- maxUploadSize:文件上传的最大值以byte为单位 -->
	<property name="maxUploadSize" value="1024000"></property>
</bean>

<!-- SpringMVC在超出上传文件限制时,会抛出org.springframework.web.multipart.MaxUploadSizeExceededException -->
<!-- 该异常是SpringMVC在检查上传的文件信息时抛出来的,未进入到Controller方法中 -->
<bean id="exceptionResolver"
	class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
	<property name="exceptionMappings">
		<props>
			<!-- 遇到MaxUploadSizeExceededException异常时,自动跳转到fill_error.jsp页-->
			<prop
				key="org.springframework.web.multipart.MaxUploadSizeExceededException">fill_error</prop>
		</props>
	</property>
</bean>

 3、view层页面 

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>
<!DOCTYPE HTML>
<html>
<head>
<base href="<%=basePath%>">
<title>SpringMVC fileUpload</title>
</head>
<body>
	<form action="test/upload1.do" method="post"
		enctype="multipart/form-data">
		选择文件1:<input type="file" name="files"> <input type="submit"
			value="上传">
	</form>
	<form action="test/upload2.do" method="post"
		enctype="multipart/form-data">
		选择文件2:<input type="file" name="files"> <input type="submit"
			value="上传">
	</form>
</body>
</html>

 4、Controller控制器,接收表单文件 

/**
	 * 转向file.jsp
	 * 
	 */
	@RequestMapping("/tofile.do")
	public String tofile() {
		return "file";
	}

	/**
	 * 上传文件1
	 */
	@RequestMapping(value = "/upload1.do")
	public String upload1(HttpServletRequest request) throws Exception {
		// 第一步转化request
		MultipartHttpServletRequest rm = (MultipartHttpServletRequest) request;
		// 获得文件
		MultipartFile mfile = rm.getFile("files");
		// 获得文件的字节数组
		byte[] bfile = mfile.getBytes();
		// 获得文件名
		String fileName = mfile.getOriginalFilename();
		System.out.println("fileName:" + fileName + "size:" + bfile.length);
		// 保存文件
		savaFile(bfile, fileName);

		return "jsp1/index";
	}

	/**
	 * 上传文件2
	 */
	@RequestMapping(value = "/upload2.do")
	public String upload2(@RequestParam("files") MultipartFile file)
			throws Exception {
		// 获得文件的字节数组
		byte[] bfile = file.getBytes();
		// 获得文件名
		String fileName = file.getOriginalFilename();
		System.out.println("fileName:" + fileName + "size:" + bfile.length);
		// 保存文件
		savaFile(bfile, fileName);
		return "jsp1/index";
	}

	/**
	 * 将bfile写入c:/fileName
	 * 
	 * @param bfile
	 * @param fileName
	 * @throws Exception
	 */
	private void savaFile(byte[] bfile, String fileName) throws Exception {
		// 定义文件的输出流
		OutputStream out = new FileOutputStream(new File("C:/", fileName));
		out.write(bfile);
		out.flush();
		out.close();
	}

  

二、使用ajaxfileupload上传文件  

1、view层页面,引入js文件,这儿使用了“ajaxfileupload.js

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
	String path = request.getContextPath();
	String basePath = request.getScheme() + "://"
			+ request.getServerName() + ":" + request.getServerPort()
			+ path + "/";
%>
<!DOCTYPE HTML>
<html>
<head>
<base href="<%=basePath%>">
<title>SpringMVC ajaxFileUpload</title>
<script type="text/javascript" src="js/jquery-1.6.2.js"></script>
<script type="text/javascript" src="js/ajaxfileupload.js"></script>
<script type="text/javascript">
	$("#mybutton").click(function(){
			upload();
	});
	//上传源码
	function upload() {
		$("#myupload").click();
	}
	function uploadFile() {
		var fileName = $("#myupload").val();
		$("#msgdiv p:first").before("您选择的文件为:"+fileName);
		//异步上传文件
		ajaxFileUpload(fileName);
	}
	
	function ajaxFileUpload(fileName){ 
	    //执行上传文件操作的函数  
	    $.ajaxFileUpload({  
	        //处理文件上传操作的服务器端地址(可以传参数)  
	        url:"test/ajaxUpload.do",  
	        secureuri:false,                           //是否启用安全提交,默认为false   
	        fileElementId:'myupload',                 //文件选择框的id属性  
	        dataType:'text',                           //服务器返回的格式,可以是json或xml等  
	        success:function(data, status){            //服务器响应成功时的处理函数  
	        	$("#msgdiv p:first").before(data);
	        },  
	        error:function(data, status, e){ //服务器响应失败时的处理函数  
	        	$("#msgdiv p:first").before(e);
	        }  
	    });  
}  
</script>
</head>
<body>
</body>
<input id="myupload" name="myfiles" type="file" onchange="uploadFile()"/><br>
<button id="mybutton">上传</button><br>
<div id="msgdiv"><p></p></div>
</html>

 注意返回结果中带入了<pre>标签,可以使用如下方法去掉<pre>标签

//ajaxFileUpload会对服务器响应回来的text内容加上<pre style="....">text</pre>前后缀  
data = data.replace(/<pre.*?>/g, '');  
data = data.replace(/<PRE.*?>/g, '');
data = data.replace("<pre>", '');    
data = data.replace("<PRE>", '');  
data = data.replace("</pre>", ''); 
data = data.replace("</PRE>", '');

2、Controller控制器,

   * 如果只是上传一个文件,则只需MultipartFile类型接收文件,而且无需显式指定@RequestParam注解
   * 如果想上传多个文件,那么这里就要用MultipartFile[]类型来接收文件,且要指定@RequestParam注解
   * 上传多个文件时,前台表单中的所有<input type="file"/>的name属性一致即可,此处为myfiles
   * 否则参数里的myfiles无法获取到所有上传的文件

/**
	 * 转向ajaxfile.jsp
	 * 
	 */
	@RequestMapping("/toajaxfile.do")
	public String toajaxfile() {
		return "ajaxfile";
	}

	/**
	 * 这里这里用的是MultipartFile[] myfiles参数,<br>
	 * 所以前台就要用<input type="file" name="myfiles"/>
	 */
	@RequestMapping(value = "/ajaxUpload.do")
	public void ajaxUpload(@RequestParam MultipartFile[] myfiles,
			HttpServletRequest request, PrintWriter out) throws IOException {

		/**
		 * 遍历文件,然后处理
		 */
		// 上传文件的原名(即上传前的文件名字)
		String originalFilename = null;
		for (MultipartFile myfile : myfiles) {
			if (myfile.isEmpty()) {
				out.print("您没有选择文件!");
				out.flush();
				return;
			}
			if (myfile.getSize() > 10485760) { // 10485760=10*1024*1024
				out.print("您选择的文件大于了10MB");
				out.flush();
				return;
			}
			// 处理文件
			originalFilename = myfile.getOriginalFilename();
			try {
				// 创建接收的新文件,此处还是保存在C盘
				File savefile = new File("C:/", originalFilename);

				// commons.io.FileUtils类,它会自动判断保存位置是否存在,不存在则自动创建
				FileUtils.copyInputStreamToFile(myfile.getInputStream(),
						savefile);
				// 结果显示回页面
				out.print("上传成功!");
				out.flush();
			} catch (IOException e) {
				e.printStackTrace();
				out.print("文件上传失败" + e.getMessage());
				out.flush();
			}
		}
	}

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