首先是导入jar包:
web.xml:
<servlet>
<servlet-name>mvc-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/configs/mvc-dispatcher-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>mvc-dispatcher</servlet-name>
<!-- mvc-dispatcher 拦截所有的请求 -->
<url-pattern>*.g</url-pattern>
</servlet-mapping>
mvc-dispatcher-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- 激活
@Required
@Autowired,jsr250's
@PostConstruct,
@PreDestroy and @ Resource等标注
-->
<context:annotation-config />
<!--
DispatcherServlet上下文,只搜索@Controller标注的类,不搜索其他标注的类
-->
<context:component-scan base-package="com.test">
<context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</context:component-scan> <!-- HandlerMapping无需配置,Spring MVC可以默认启动
-->
<!--
扩充了注解驱动,可以将请求参数绑定到控制器参数
启用基于annotation的handlerMapping.
-->
<!-- <mvc:annotation-driven /> -->
<mvc:annotation-driven>
<mvc:message-converters register-defaults="true">
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<constructor-arg>
<bean class="java.nio.charset.Charset" factory-method="forName">
<constructor-arg value="UTF-8" />
</bean>
</constructor-arg>
</bean> <bean class="org.springframework.http.converter.StringHttpMessageConverter">
<!-- 控制RequestBody返回值乱码 -->
<property name="supportedMediaTypes" value = "text/plain;charset=UTF-8" />
</bean> </mvc:message-converters>
</mvc:annotation-driven>
<!--
静态资源处理,css,js,imgs
-->
<mvc:resources location="/resources/" mapping="/resources/**"/> <!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
<property name="prefix" value="/WEB-INF/jsps/" />
<property name="suffix" value=".jsp" />
</bean> <!-- 配置上传文件代码,导入commons-fileupload-1.2.2.jar,commons-io-2.4.jar
200*1024*1024即200M resolveLazily属性启用是为了推迟文件解析,以便捕获文件大小异常
-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 上传的最大限制 -->
<property name="maxUploadSize" value="209715200" />
<!-- 默认编码 -->
<property name="defaultEncoding" value="UTF-8" />
<!-- 上传文件的解析 -->
<property name="resolveLazily" value="true" />
</bean> <!-- 整合json,导入jackson-core-asl-1.1.2.jar,jackson-mapper-asl-1.1.2.jar
配置ViewResolver.
可以用多个ViewResolver.使用order属性排序.InternalResourceViewResolver放在最后
-->
<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="order" value="1" />
<property name="mediaTypes">
<map>
<entry key="json" value="application/json" />
<entry key="xml" value="application/xml" />
<entry key="htm" value="text/html" />
</map>
</property>
<property name="defaultViews">
<list>
<!-- JSON View -->
<bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView"></bean>
</list>
</property>
<property name="ignoreAcceptHeader" value="true" />
</bean>
</beans>
UploadController.java
@Controller
@RequestMapping(value = "/mvc")
public class UploadController {
/** 上传目录名*/
private static String uploadFolderName = "uploadFiles";
/** 允许上传的扩展名*/
private static String [] extensionPermit = {"txt","jpg","xls","zip"};
/**
* 上传文件
* @param file
* @return
* @throws IOException
*/
@RequestMapping(value="/upload",method=RequestMethod.POST)
public String doUploadFile(@RequestParam("file") MultipartFile file) throws IOException{
if(!file.isEmpty()){
System.out.println("提示:"+file.getOriginalFilename());
FileUtils.copyInputStreamToFile(file.getInputStream(), new File("d:\\upload\\",System.currentTimeMillis()+file.getOriginalFilename()));
}
return "success";
}
}
最终这个文件会被上传到d:upload里面,可是我们想把代码上传到项目文件夹里面,做一些修改.
@Controller
@RequestMapping(value = "/mvc")
public class UploadController {
/** 上传目录名*/
private static final String uploadFolderName = "uploadFiles";
/** 允许上传的扩展名*/
private static String [] extensionPermit = {"txt","jpg","xls","zip"};
@RequestMapping(value = "/upload", method = RequestMethod.POST)
public @ResponseBody String fileUpload(@RequestParam("file") CommonsMultipartFile file,
HttpSession session, HttpServletRequest request, HttpServletResponse response) throws Exception{
String curProjectPath = session.getServletContext().getRealPath("/");
String saveDirectoryPath = curProjectPath + "/" + uploadFolderName;
File saveDirectory = new File(saveDirectoryPath);
logger.debug("Project real path [" + saveDirectory.getAbsolutePath() + "]"); // 判断文件是否存在
if (!file.isEmpty()) {
String fileName = file.getOriginalFilename();
String fileExtension = FilenameUtils.getExtension(fileName);
if(!Arrays.asList(extensionPermit).contains(fileExtension)){
throw new Exception("No Support extension.");
}
FileUtils.copyInputStreamToFile(file.getInputStream(), new File(saveDirectoryPath,System.currentTimeMillis()+file.getOriginalFilename()));
}
logger.info("UploadController#fileUpload() end");
return "{'status':200,'msg':'上传成功'}"; }
}
运行后,在tomcat的项目目录里就可以找到新建的文件了.
后台代码编写完毕了,现在编写前台.
首先准备jquery,和ajaxfileupload.js
下载下来的ajaxfileupload.js需要做相应的修改,才能接收上传成功后从服务器返回的数据,
修改后才能和现在高版本的jquery相兼容.
具体改了哪些地方就不啰嗦了.我把改过的最终代码全部贴上来.
ajaxfileupload.js
jQuery.extend({
createUploadIframe: function (id, uri) {
//create frame
var frameId = 'jUploadFrame' + id;
var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
if (window.ActiveXObject) {
if (typeof uri == 'boolean') {
iframeHtml += ' src="' + 'javascript:false' + '"';
}
else if (typeof uri == 'string') {
iframeHtml += ' src="' + uri + '"';
}
}
iframeHtml += ' />';
jQuery(iframeHtml).appendTo(document.body);
return jQuery('#' + frameId).get(0);
},
createUploadForm: function (id, fileElementId, data) {
//create form
var formId = 'jUploadForm' + id;
var fileId = 'jUploadFile' + id;
var form = jQuery('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
if (data) {
for (var i in data) {
if (data[i].name != null && data[i].value != null) {
jQuery('<input type="hidden" name="' + data[i].name + '" value="' + data[i].value + '" />').appendTo(form);
} else {
jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
}
}
}
var oldElement = jQuery('#' + fileElementId);
var newElement = jQuery(oldElement).clone();
jQuery(oldElement).attr('id', fileId);
jQuery(oldElement).before(newElement);
jQuery(oldElement).appendTo(form);
//set attributes
jQuery(form).css('position', 'absolute');
jQuery(form).css('top', '-1200px');
jQuery(form).css('left', '-1200px');
jQuery(form).appendTo('body');
return form;
},
ajaxFileUpload: function (s) {
// TODO introduce global settings, allowing the client to modify them for all requests, not only timeout
s = jQuery.extend({}, jQuery.ajaxSettings, s);
var id = new Date().getTime()
var form = jQuery.createUploadForm(id, s.fileElementId, (typeof (s.data) == 'undefined' ? false : s.data));
var io = jQuery.createUploadIframe(id, s.secureuri);
var frameId = 'jUploadFrame' + id;
var formId = 'jUploadForm' + id;
// Watch for a new set of requests
if (s.global && !jQuery.active++) {
jQuery.event.trigger("ajaxStart");
}
var requestDone = false;
// Create the request object
var xml = {}
if (s.global)
jQuery.event.trigger("ajaxSend", [xml, s]);
// Wait for a response to come back
var uploadCallback = function (isTimeout) {
var io = document.getElementById(frameId);
try {
if (io.contentWindow) {
xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML : null;
xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument : io.contentWindow.document;
} else if (io.contentDocument) {
xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML : null;
xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument : io.contentDocument.document;
}
} catch (e) {
jQuery.handleError(s, xml, null, e);
}
if (xml || isTimeout == "timeout") {
requestDone = true;
var status;
try {
status = isTimeout != "timeout" ? "success" : "error";
// Make sure that the request was successful or notmodified
if (status != "error") {
// process the data (runs the xml through httpData regardless of callback)
var data = jQuery.uploadHttpData(xml, s.dataType);
// If a local callback was specified, fire it and pass it the data
if (s.success)
s.success(data, status);
// Fire the global callback
if (s.global)
jQuery.event.trigger("ajaxSuccess", [xml, s]);
} else
jQuery.handleError(s, xml, status);
} catch (e) {
status = "error";
jQuery.handleError(s, xml, status, e);
}
// The request was completed
if (s.global)
jQuery.event.trigger("ajaxComplete", [xml, s]);
// Handle the global AJAX counter
if (s.global && ! --jQuery.active)
jQuery.event.trigger("ajaxStop");
// Process result
if (s.complete)
s.complete(xml, status);
jQuery(io).unbind()
setTimeout(function () {
try {
jQuery(io).remove();
jQuery(form).remove();
} catch (e) {
jQuery.handleError(s, xml, null, e);
}
}, 100)
xml = null
}
}
// Timeout checker
if (s.timeout > 0) {
setTimeout(function () {
// Check to see if the request is still happening
if (!requestDone) uploadCallback("timeout");
}, s.timeout);
}
try {
var form = jQuery('#' + formId);
jQuery(form).attr('action', s.url);
jQuery(form).attr('method', 'POST');
jQuery(form).attr('target', frameId);
if (form.encoding) {
jQuery(form).attr('encoding', 'multipart/form-data');
}
else {
jQuery(form).attr('enctype', 'multipart/form-data');
}
jQuery(form).submit();
} catch (e) {
jQuery.handleError(s, xml, null, e);
}
jQuery('#' + frameId).load(uploadCallback);
return { abort: function () { } };
},
uploadHttpData: function (r, type) {
var data = !type;
if (!type)
data = r.responseText;
if (type == "xml")
data = r.responseXML;
//data = type == "xml" || data ? r.responseXML : r.responseText;
// If the type is "script", eval it in global context
if (type == "script")
jQuery.globalEval(data);
// Get the JavaScript object, if JSON is used.
if (type == "json") {
////////////Fix the issue that it always throws the error "unexpected token '<'"///////////////
data = r.responseText;
var start = data.indexOf(">");
if (start != -1) {
var end = data.indexOf("<", start + 1);
if (end != -1) {
data = data.substring(start + 1, end);
}
}
///////////////////////////////////////////////////////////////////////////////////////////////
eval("data = " + data);
}
// evaluate scripts within html
if (type == "html")
jQuery("<div>").html(data).evalScripts();
return data;
},
handleError: function (s, xhr, status, e) {
// If a local callback was specified, fire it
if (s.error) {
s.error.call(s.context || s, xhr, status, e);
}
// Fire the global callback
if (s.global) {
(s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError", [xhr, s, e]);
}
}
})
html代码:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>上传页面三</title>
<script type="text/javascript" src="static/js/jquery-1.7.2.js"></script>
<script type="text/javascript" src="static/js/ajaxfileupload.js"></script>
</head> <body>
<h2>JQuery ajaxfileupload文件上传</h2>
<div id="loading" style="display: none;">正在上传.....</div>
用户信息：
<br /> 姓名：
<input id="name" name="name" type="text">
<br /> 附件：
<input id="fileToUpload" name="file" type="file" class="input">
<br />
<input type="button" onclick="ajaxFileUpload()" value="上传">
<br /> <script type="text/javascript">
function ajaxFileUpload() {
$('#loading').show();
$.ajaxFileUpload({
url : 'mvc/upload.g',
secureuri : false,
fileElementId : 'fileToUpload',
dataType : 'json',//此时指定的是后台需要返回json字符串,前端自己解析,可以注释掉.后台直接返回map
data : {
name : $('#name').val()
},
success : function(data, status) {
alert("success");
console.log(data);
$('#loading').hide();
},
error : function(data, status, e) {
$('#loading').hide();
//这里处理的是网络异常，返回参数解析异常，DOM操作异常
alert("上传发生异常");
}
})
}
</script>
</body>
</html>
好,结束.
当你程序跑起来的时候,打开控制台你是看不到ajax提交请求的.因为ajaxFileupload.js上传的 原理是:form表单+iframe提交的.
服务器端返回的数据最终会进入到iframe里面的.通过修改ajaxFileUpload.js把这个数据从ifram中解析出来.
这个过程可以在success里加个alert,阻止脚本执行,来观察到.当success执行完毕后,form和iframe被删除.
可以结合前面的上传博客来更好地理解这里.