structs利用 FileUtils 类文件上传示例

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运用 FileUtils 类

利用 apache 的 IO 流的 FileUtils 类实现操作

在structs的jar包中，有 commons-io-2.2.jar
参考：http://snkcxy.iteye.com/blog/1845862 有更多文件读写，删除操作

文件copy操作

    //结果是cxyapi和cxyapi1在同一目录      FileUtils.copyDirectory(new File("D:/cxyapi"), new File("D:/cxyapi1"));       //结果是将cxyapi拷贝到cxyapi2下      FileUtils.copyDirectoryToDirectory(new File("D:/cxyapi"), new File("D:/cxyapi2"));      //拷贝文件      FileUtils.copyFile(new File("d:/cxyapi.xml"), new File("d:/cxyapi.xml.bak"));      //拷贝文件到目录中      FileUtils.copyFileToDirectory(new File("d:/cxyapi.xml"), new File("d:/cxyapi"));      //拷贝url到文件      FileUtils.copyURLToFile(new URL("http://www.cxyapi.com/rss/cxyapi.xml"), new File("d:/cxyapi.xml"));

把D:/TestCopy/test2.jpg 文件拷贝一份到目录下的 test3.jpg

try {    FileUtils.copyFile(new File("D:/TestCopy/test2.jpg"), new File("D:/TestCopy/test3.jpg"));    } catch (IOException e) {        e.printStackTrace();    }

structs文件单文件上传示例

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structs.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN""http://struts.apache.org/dtds/struts-2.3.dtd"><struts>    <package name="default" namespace="/" extends="struts-default">    <action name="uploadaction" class="action.UploadAction" method="upload">        <result>/index.jsp</result>    </action>    </package></struts>

web.xml

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">  <display-name>structs2upload</display-name>  <filter>  <filter-name>struts2</filter-name>  <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping>  <filter-name>struts2</filter-name>  <url-pattern>/*</url-pattern> </filter-mapping>  <welcome-file-list>     <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

UploadAction.java

//package action;import java.io.File;import java.io.IOException;import org.apache.commons.io.FileUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;@SuppressWarnings("serial")public class UploadAction extends ActionSupport{    private File uploadImage;//得到上传的文件    private String uploadContentType;//得到文件的类型    private String uploadImageFileName;//得到文件的名称        @Override        public String execute() throws Exception {            return super.execute();        }        public String upload(){            String realpath = ServletActionContext.getServletContext().getRealPath("/images");            System.out.println("文件存放路径"+realpath);//自己也可以定义            File file = new File(realpath);            if(!file.exists())                 file.mkdir();//创建目录            try {                FileUtils.copyFile(uploadImage, new File(file,uploadImageFileName));            } catch (IOException e) {                e.printStackTrace();            }            return SUCCESS;        }        public File getUploadImage() {            return uploadImage;        }        public void setUploadImage(File uploadImage) {            this.uploadImage = uploadImage;        }        public String getUploadContentType() {            return uploadContentType;        }        public void setUploadContentType(String uploadContentType) {            this.uploadContentType = uploadContentType;        }        public String getUploadImageFileName() {            return uploadImageFileName;        }        public void setUploadImageFileName(String uploadImageFileName) {            this.uploadImageFileName = uploadImageFileName;        }}

upload.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body>    <form action="uploadaction" method="post" enctype="multipart/form-data">        <input type="file" name="uploadImage"/>        <br>        <input type="submit" value="upload"/>    </form></body></html>

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title></head><body>上传成功</body></html>

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文件上传到的目录（workspace目录）

D:\eclipse\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps\structs2upload\images

structs文件多文件上传示例

同时上传两个文件

upload.jsp

..<body>    <form action="uploadaction" method="post" enctype="multipart/form-data">        <input type="file" name="uploadImage"/><br/>        <input type="file" name="uploadImage"/><br/>        <br>        <input type="submit" value="upload"/>    </form></body>..

UploadAction.java

//package action;import java.io.File;import java.io.IOException;import org.apache.commons.io.FileUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;@SuppressWarnings("serial")public class UploadAction extends ActionSupport{    private File[] uploadImage;//得到上传的文件    private String[] uploadContentType;//得到文件的类型    private String[] uploadImageFileName;//得到文件的名称        @Override        public String execute() throws Exception {            return super.execute();        }        public String upload(){            String realpath = ServletActionContext.getServletContext().getRealPath("/images");            System.out.println(realpath);            File file = new File(realpath);            if(!file.exists())                 file.mkdir();//创建目录            try {                for(int i=0;i<uploadImage.length;i++){                    FileUtils.copyFile(uploadImage[i], new File(file,uploadImageFileName[i]));                }                //FileUtils.copyFile(uploadImage, new File(file,uploadImageFileName));            } catch (IOException e) {                e.printStackTrace();            }            return SUCCESS;        }        public File[] getUploadImage() {            return uploadImage;        }        public void setUploadImage(File[] uploadImage) {            this.uploadImage = uploadImage;        }        public String[] getUploadContentType() {            return uploadContentType;        }        public void setUploadContentType(String[] uploadContentType) {            this.uploadContentType = uploadContentType;        }        public String[] getUploadImageFileName() {            return uploadImageFileName;        }        public void setUploadImageFileName(String[] uploadImageFileName) {            this.uploadImageFileName = uploadImageFileName;        }   }

web传递文件必须要求文件大小比较小，（2,3M）,文件太大，http上传速度慢
如果是大量文件上传通过socket通讯传递
structs中有常量可以来限制文件上传的大小

<!-- 上传文件的10M大小限制-->   <constant name="struts.multipart.maxSize" value="11943040"/>

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