struts2单文件与多文件上传

Struts2的单文件上传与多文件上传.

首先这个是html页面内容:

单文件上传:<br/><form action="fileUpload" method="post" enctype="multipart/form-data">    username:<input type="text" name="username"/><br/>        <input type="file" name="file"/><br/>        <input type="submit"/>   </form>      多文件上传:<br/>    <form action="mulFileUpload" method="post" enctype="multipart/form-data">        <input type="file" name="files"/><br/>        <input type="file" name="files"/><br/>        <input type="file" name="files"/><br/>        <input type="submit"/>   </form>

然后是struts action文件代码:

package com.action; import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.List; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; public class UploadAction  extends ActionSupport{    private static final long serialVersionUID = 1L;    private String username;    private File file;    private String fileFileName;    //名字固定的 file与file相同 FileName固定    private String fileContentType; //名字固定的 file与file线条 ContentType固定    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    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 getFileContentType() {        return fileContentType;    }    public void setFileContentType(String fileContentType) {        this.fileContentType = fileContentType;    }         public String fileUpload() throws Exception {        //设置上传路径-----------真实的文件路径.如:c://tomcat//webapps//upload        String //root=ServletActionContext.getRequest().getRealPath("/upload"); //该方法在2.1之前使用                      root=ServletActionContext.getServletContext().getRealPath("/upload");                 //输入        InputStream is=new FileInputStream(file);                 //设置文件存放的路径与名字        File destFile=new File(root, fileFileName);                 //程序先会将文件放置到临时目录，然后从临时目录转移到指定目录        //如果临时目录不存在将使用环境变量所指定的目录,如:...tomcat/work ....下面        //通过struts.properties -->struts.multipart.saveDir  可以设置临时目录        //如:struts.multipart.saveDir=d:/temp                          //输出文件        OutputStream os=new FileOutputStream(destFile);        //每次传输的字节        byte[] buffer=new byte[400];        //按字节读取文件的长度        int length=0;        //如果没有读取到内容将返回-1        while((length=is.read(buffer))!=-1){            os.write(buffer,0,length);        }        //关闭        is.close();                 return SUCCESS;                 //如果出错了将返回INPUT    }                         public List<File> getFiles() {        return files;    }    public void setFiles(List<File> files) {        this.files = files;    }    public List<String> getFilesFileName() {        return filesFileName;    }    public void setFilesFileName(List<String> filesFileName) {        this.filesFileName = filesFileName;    }    public List<String> getFilesContentType() {        return filesContentType;    }    public void setFilesContentType(List<String> filesContentType) {        this.filesContentType = filesContentType;    }     //前面为get/set方法    private List<File> files; //也可用File[] files    private List<String> filesFileName;    private List<String> filesContentType;    /*     *  多文件上传     */    public String mulFileUpload(){                 for (int i = 0; i < files.size(); i++) {            InputStream is=null;            try {                is=new FileInputStream(files.get(i));                String root=ServletActionContext.getServletContext().getRealPath("/upload");                File destFile=new File(root,filesFileName.get(i));                OutputStream os=new FileOutputStream(destFile);                byte[] buffer=new byte[400];                int length=0;                while((length=is.read(buffer))!=-1){                    os.write(buffer,0,length);                }                is.close();            } catch (FileNotFoundException e) {                e.printStackTrace();            } catch (IOException e) {                e.printStackTrace();            }        }                 return SUCCESS;    }}

然后是struts.xml 配置内容:

<!-- 单文件上传 -->        <action name="fileUpload" class="com.action.UploadAction" method="fileUpload">            <result name="success">fileuploadresult.jsp</result>            <result name="input">fileuploaderror.jsp</result>        </action>                 <!-- 多文件上传 -->        <action name="mulFileUpload" class="com.action.UploadAction" method="mulFileUpload">            <result name="success">fileuploadresult.jsp</result>            <result name="input">fileuploaderror.jsp</result>        </action>

然后效果图

文章来源：http://www.zhjie.net/struts2-single-file-and-multi-file-upload.htm