1.1.1新建一個Maven項目(demo02)css
在此添加Web構面以及 struts2 構面html
1.2.1配置Maven依賴(pom.xml 文件)java
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.nf</groupId> <artifactId>parent</artifactId> <version>1.0-SNAPSHOT</version> <relativePath>../pom.xml</relativePath> </parent> <artifactId>demo02</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> </project>
1.2.2 項目中pom文件所繼承的父文件(pom.xml)jquery
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <artifactId>parent</artifactId> <groupId>org.nf</groupId> <version>1.0-SNAPSHOT</version> <packaging>pom</packaging> <properties> <!-- 設置整個maven項目的編碼格式 --> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <!-- 設置控制檯輸出參數的編碼格式, 解決亂碼 --> <orgLine>-Dfile.encoding=UTF-8</orgLine> </properties> <build> <plugins> <!-- 配置maven編譯插件,指定maven編譯版本 --> <plugin> <!-- 插件名稱 --> <artifactId>maven-compiler-plugin</artifactId> <!-- 插件配置信息 --> <configuration> <target>1.8</target> <source>1.8</source> <encoding>UTF-8</encoding> </configuration> </plugin> <plugin> <!-- 插件名稱 --> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-war-plugin</artifactId> <version>2.2</version> <configuration> <warSourceDirectory>web</warSourceDirectory> <webXml>web\WEB-INF\web.xml</webXml> </configuration> </plugin> </plugins> </build> <!-- 添加Struts依賴 --> <dependencies> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> </dependency> <dependency> <groupId>org.apache.struts</groupId> <artifactId>struts2-core</artifactId> <version>2.5.8</version> </dependency> <dependency> <groupId>org.apache.struts</groupId> <artifactId>struts2-json-plugin</artifactId> <version>2.5.8</version> </dependency> </dependencies> </project>
1.2.3所添加好的依賴jar包以下:web
1.3.1編寫上傳文件頁面(upload.jsp)ajax
<%@ taglib prefix="s" uri="/struts-tags" %> <%-- Created by IntelliJ IDEA. User: YongLin Date: 2017/2/9 Time: 下午2:44 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Upload</title> </head> <body> <!--方式一: 使用struts錯誤信息提示的標籤,會自動輸出錯誤信息 --> <s:fielderror cssStyle="color: red"/> <!--方式二: 使用el表達式來獲取錯誤信息,uploadFile對應input的name,它是一個數組 當多文件上傳時,應該循環遍歷這個數組來顯示提示信息的內容--> <%--<font color="red">${fieldErrors.uploadFile[0]}</font>--%> <form method="post" action="upload" enctype="multipart/form-data"> File:<input type="file" name="uploadFile"/><br/> Readme:<input type="text" name="readme"/><br/> <input type="submit" value="submit"/> </form> </body> </html>
運行效果:apache
1.4.1struts.xml文件json
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN" "http://struts.apache.org/dtds/struts-2.5.dtd"> <struts> <!-- 設置編碼格式,防止上傳的文件名爲中文時是亂碼 --> <constant name="struts.i18n.encoding" value="UTF-8"/> <!-- 指定resource資源文件的名稱--> <constant name="struts.custom.i18n.resources" value="message"/> <!-- 設置上傳文件的總大小(單位:字節),默認是10M --> <constant name="struts.multipart.maxSize" value="104857600"/> <package name="struts" extends="struts-default,json-default"> <!-- 配置上傳的攔截器 --> <interceptors> <interceptor-stack name="myStack"> <!-- 配置上傳的攔截器 --> <interceptor-ref name="fileUpload"> <!-- 限制上傳的文件類型,這裏限制爲只能上傳各類圖片類型 --> <!--<param name="allowedTypes">image/bmp,image/png,image/jpg,image/jpeg</param>--> <!-- 限制上傳文件的大小(單位是字節)--> <!--<param name="maximumSize">2097152</param>--> </interceptor-ref> <!-- 引用默認的攔截器棧 --> <interceptor-ref name="defaultStack"/> </interceptor-stack> </interceptors> <!-- 普通上傳 --> <action name="upload" class="org.demo02.action.DemoAction" method="upload"> <!-- 引用攔截器 --> <interceptor-ref name="myStack"/> <!-- 上傳成功後跳轉的頁面 --> <result>index.jsp</result> <!-- 上傳失敗或有錯誤的提示頁面, name="input"表示當有錯誤信息的時候要跳轉到的提示頁面--> <result name="input">upload.jsp</result> </action> <!-- ajax上傳,後臺的上傳方法是同樣的,不一樣的是result的配置 --> <action name="ajaxUpload" class="org.demo02.action.DemoAction" method="upload"> <!-- 引用攔截器 --> <interceptor-ref name="myStack"/> <result type="json"> <param name="root">message</param> </result> <!-- 使用json結果集類型返回錯誤信息,用於ajax請求 struts會將fieldErrors序列化成json對象 --> <result name="input" type="json"> <param name="root">fieldErrors</param> </result> </action> <!-- 文件下載 --> <action name="download" class="org.demo02.action.DownloadAction" method="download"> <!-- 文件下載的結果集類型使用stream,表示一個流 --> <result type="stream"> <!-- 設置一些下載的參數配置 --> <!-- contentType表示設置response的響應類型,這裏設置爲流類型 --> <param name="contentType">application/octet-stream</param> <!-- contentDisposition指定響應回客戶端的下載的文件名, ${fileName}引用action中定義的fileName屬性--> <param name="contentDisposition">attachment;filename="${fileName}"</param> <!-- inputName指定action中定義的getXxx方法,去掉get並將首字母改爲小寫 --> <param name="inputName">inputStream</param> <!-- 下載文件的緩衝大小(可選) --> <param name="bufferSize">4096</param> </result> </action> </package> </struts>
1.4.2 顯示錯誤信息中文提示的:message.propertiesapi
struts.messages.error.content.type.not.allowed = 不是容許的上傳類型
struts.messages.error.file.too.large = 已超出文件的限制大小
1.4.3文件上傳的action:DemoAction數組
package org.demo02.action; import com.opensymphony.xwork2.ActionSupport; import org.apache.commons.io.FileUtils; import org.apache.struts2.ServletActionContext; import java.io.File; import java.io.IOException; /** * Created by YongLin on 17/2/9. */ public class DemoAction extends ActionSupport { //表單文本數據 private String readme; //表單文件,必須是一個File類型 private File uploadFile; //上傳的文件名,格式必須是File名稱 + FileName private String uploadFileFileName; //上傳的文件類型,格式必須是File名稱 + ContentType private String uploadFileContentType; private String message; public String getReadme() { return readme; } public void setReadme(String readme) { this.readme = readme; } public File getUploadFile() { return uploadFile; } public void setUploadFile(File uploadFile) { this.uploadFile = uploadFile; } public String getUploadFileFileName() { return uploadFileFileName; } public void setUploadFileFileName(String uploadFileFileName) { this.uploadFileFileName = uploadFileFileName; } public String getUploadFileContentType() { return uploadFileContentType; } public void setUploadFileContentType(String uploadFileContentType) { this.uploadFileContentType = uploadFileContentType; } public String getMessage() { return message; } public void setMessage(String message) { this.message = message; } //上傳 public String upload() throws IOException { //獲取上傳的絕對路徑 String uploadPath = ServletActionContext.getServletContext().getRealPath("/files"); //若是提交過來的File不爲null,才執行上傳操做 if(uploadFile != null){ System.out.println(uploadFileFileName); System.out.println(uploadFileContentType); //根據文件名以及上傳的路徑構建一個新的File對象 File saveFile = new File(uploadPath, uploadFileFileName); //先判斷上傳的目錄是否存在,若是不存在則建立出來 if(!saveFile.getParentFile().exists()){ saveFile.getParentFile().mkdirs(); } //使用文件複製執行上傳 FileUtils.copyFile(uploadFile, saveFile); //提示成功信息 message = "上傳成功"; } return "success"; } }
1.4.4 文件下載的action:DownloadAction
package org.demo02.action; import com.opensymphony.xwork2.ActionSupport; import org.apache.struts2.ServletActionContext; import java.io.*; /** * Created by YongLin on 17/2/10. */ public class DownloadAction extends ActionSupport { //要下載的文件名 private String fileName; public String getFileName() { //解決下載文件時中文名時出現亂碼 try { fileName = new String(fileName.getBytes("utf-8"), "ISO8859-1"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } return fileName; } public void setFileName(String fileName) { this.fileName = fileName; } //咱們須要提供一個方法,這個方法是一個標準的get方法,如getXxx //並經過這個方法建立並返回一個InputStream給struts //struts就會根據這個輸入流讀取文件,並寫回客戶端 public InputStream getInputStream() throws Exception { //獲取文件上傳的目錄 String uploadPath = ServletActionContext.getServletContext().getRealPath("/files"); //根據路徑結合提交過來的文件名,建立一個File對象 File file = new File(uploadPath, fileName); //建立InputStream對象 BufferedInputStream inputStream = new BufferedInputStream(new FileInputStream(file)); //返回這個輸入流給struts return inputStream; } public String download(){ return "success"; } }
1.4.5Web.xml文件
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <filter> <filter-name>dispatcher</filter-name> <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>dispatcher</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
1.5.1index.jsp頁面
<%-- Created by IntelliJ IDEA. User: YongLin Date: 2017/2/9 Time: 下午2:44 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@ taglib prefix="s" uri="/struts-tags" %> <html> <head> <title>Index</title> </head> <body> <!-- 顯示文件名,並能夠執行下載操做 --> <a href="download?fileName=<s:property value='uploadFileFileName'/>"><s:property value="uploadFileFileName"/></a> </body> </html>
1.5.2Ajax 文件上傳(須要引入jQery包)
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <script src="js/jquery-1.9.1.min.js"></script> <script> $(function(){ $("#btn").on("click",function(){ //使用FormData來實現表單的封裝和ajax上傳 var formData = new FormData(document.getElementById("f1")); //使用jquery的ajax提交表單 $.ajax({ url : "ajaxUpload", //請求的url type : "post", //請求類型 data : formData, //表單數據 processData : false, //讓Jquery不處理髮送的數據 contentType : false, //讓Jquery不設置Content-Type請求頭 success : function(result){ // 成功響應後的回調函數 if(result.uploadFile != undefined){ $("#msg").append("<font color='red'>"+result.uploadFile+"</font>"); }else{ $("#msg").append("<font color='red'>"+result+"</font>"); } } }); }); }); </script> </head> <body> <div id="msg"></div> <form id="f1" method="post" action="upload" enctype="multipart/form-data"> File:<input type="file" name="uploadFile"/><br/> Readme:<input type="text" name="readme"/><br/> <input id="btn" type="button" value="button"/> </form> </body> </html>
1.6.1運行效果:
1.
點擊提交 文件上傳成功事後來到index.jsp頁面
在頁面中顯示出文件名
2.
3.
4.Ajax文件上傳
1.7.1Demo總體架構
1.8實例下載