異步上傳相信你們都作過相似的功能,JqueryAjaxFileUploader爲咱們提供了更簡單的實現和使用方式。不過既然是JQUERY的插件那麼它所依賴的環境你們都懂得。JqueryAjaxFileUploader並不華麗,也沒有提供美化文件上傳控件的css,它並不像jQuery File Upload(喜歡的同窗能夠去嘗試下),提供了美觀的樣式和專門的圖片預覽、多任務上傳等等, JqueryAjaxFileUploader 所擁有的很簡單,只是異步上傳文件的功能,固然這並不排除由你親自爲它披上一件華麗的外衣。javascript
jQuery File Uplaod插件官方Demo:css

好了言歸正傳,讓咱們一塊兒來看下 JqueryAjaxFileUplaoder 的使用步驟:html
- <html>
- <head>
- <base href="<%=basePath%>">
-
- <title>My starting page</title>
- <meta http-equiv="pragma" content="no-cache">
- <meta http-equiv="cache-control" content="no-cache">
- <meta http-equiv="expires" content="0">
- <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
- <meta http-equiv="description" content="This is my page">
- <script type="text/javascript" src="js/jquery.js">
- </script>
- <script type="text/javascript" src="js/ajaxfileupload.js">
- </script>
- <script type="text/javascript">
- function ajaxFileUpload() {
-
- $("#loading").ajaxStart(function() {
- $(this).show();
- })
- .ajaxComplete(function() {
- $(this).hide();
- });
-
- $.ajaxFileUpload( {
- url : 'fileUpload.action',
- secureuri : false,
- fileElementId : 'File',
- dataType : 'json',
- success : function(data, status)
- {
- alert(data.message);
- if (typeof (data.error) != 'undefined') {
- if (data.error != '') {
- alert(data.error);
- } else {
- alert(data.message);
- }
- }
- },
- error : function(data, status, e)
- {
- alert(e);
- }
- })
- return false;
- }
- </script>
- </head>
-
- <body>
- <img src="img/loading.gif" id="loading" style="display: none;">
- <input type="file" id="file" name="file" />
- <br />
- <input type="button" value="上傳" onclick="return ajaxFileUpload();">
- </body>
- </html>
注意:引入JS文件不要搞錯了順序,必定是先引入jQuery再引入插件。不然後果的嚴重性你是能夠想到的。java
上文中我請求了一個Action,並在Action裏寫好所須要的參數,以及文件格式的判斷(這裏我只是作的僞實現,過濾文件格式還請你們認真考慮),這個你們確定都熟。jquery
- import java.io.File;
- import java.io.FileInputStream;
- import java.io.FileOutputStream;
-
- import org.apache.struts2.ServletActionContext;
-
- import com.opensymphony.xwork2.ActionSupport;
-
- @SuppressWarnings("serial")
- public class FileAction extends ActionSupport {
-
- private File file;
- private String fileFileName;
- private String fileFileContentType;
-
- private String message = "你已成功上傳文件";
-
- public String getMessage() {
- return message;
- }
-
- public void setMessage(String message) {
- this.message = message;
- }
-
- public File getFile() {
- return file;
- }
-
- public void setFile(File file) {
- this.file = file;
- }
-
- public String getFileFileName() {
- return fileFileName;
- }
-
- public void setFileFileName(String fileFileName) {
- this.fileFileName = fileFileName;
- }
-
- public String getFileFileContentType() {
- return fileFileContentType;
- }
-
- public void setFileFileContentType(String fileFileContentType) {
- this.fileFileContentType = fileFileContentType;
- }
-
- @SuppressWarnings("deprecation")
- @Override
- public String execute() throws Exception {
-
- String path = ServletActionContext.getRequest().getRealPath("/upload");
-
- try {
- File f = this.getFile();
- if(this.getFileFileName().endsWith(".exe")){
- message="對不起,你上傳的文件格式不容許!!!";
- return ERROR;
- }
- FileInputStream inputStream = new FileInputStream(f);
- FileOutputStream outputStream = new FileOutputStream(path + "/"+ this.getFileFileName());
- byte[] buf = new byte[1024];
- int length = 0;
- while ((length = inputStream.read(buf)) != -1) {
- outputStream.write(buf, 0, length);
- }
- inputStream.close();
- outputStream.flush();
- } catch (Exception e) {
- e.printStackTrace();
- message = "對不起,文件上傳居然失敗了!!!!";
- }
- return SUCCESS;
- }
-
- }
還有重要的一步,配置Struts配置文件,必定要注意的是Action中result的配置contentType參數是必定要有的,不然瀏覽器老是提示將返回的JSON結果另存爲文件,不會交給ajaxfileupload處理。這是由於struts2 JSON Plugin默認的contentType爲application/json,而ajaxfileupload則要求爲text/html。ajax
- <?xml version="1.0" encoding="UTF-8" ?>
- <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
- <struts>
- <package name="struts2" extends="json-default">
- <action name="fileUpload" class="com.ajaxfile.action.FileAction">
- <result type="json" name="success">
- <param name="contentType">
- text/html
- </param>
- </result>
- <result type="json" name="error">
- <param name="contentType">
- text/html
- </param>
- </result>
- </action>
- </package>
- </struts>
Ok就是這樣,要動手的同窗立刻Coding吧。順便提供下JqueryAjaxFileUploader的JS文件。apache