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单个文件上传

2024-08-16 04:11:01   217人阅读

文件上传

//准备文件

1.上传单个文件页面

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="http://www.mamicode.com/">    <title>文件上传</title>  </head>  <body>  <!-- 上传页面的准备 -->  <s:form action="upload.action" enctype="multipart/form-data" method="post">      <s:textfield name ="title" label ="标题"/><br/>      <s:file name ="upload" label="选择文件"/><br/>      <s:submit name ="submit" value ="http://www.mamicode.com/上传文件"/>  </s:form>   </body></html>
2.在struts.xml中配置相应的action
 <action name ="upload" class="action.UploadAction">        <!--通过param参数设置保存目录的路径 -->        <param name="savePath">/image</param>        <result name="success">/upload_success.jsp</result>    </action>
3.在根据action节点找对应的类
package action;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UploadAction extends ActionSupport{    //封装上传文件的属性    private File upload;    //封装上传文件的类型    private String uploadContentType;    //封装上传文件的名称    private String uploadFileName;        public File getUpload() {        return upload;    }    public void setUpload(File upload) {        this.upload = upload;    }    public String getUploadContentType() {        return uploadContentType;    }    public void setUploadContentType(String uploadContentType) {        this.uploadContentType = uploadContentType;    }    public String getUploadFileName() {        return uploadFileName;    }    public void setUploadFileName(String uploadFileName) {        this.uploadFileName = uploadFileName;    }    public void setSavePath(String savePath) {        this.savePath = savePath;    }    //获取文件上传的路径    private String savePath;    @Override    public String execute() throws Exception {            //创建缓存数组            byte [] buffer =new byte[1024];            //读取文件                FileInputStream fis =new FileInputStream(getUpload());                //保存文件，并设置保存目录的路径                FileOutputStream fos =new FileOutputStream(getSavePath()+"\\"+this.getUploadFileName());                int length =fis.read(buffer);                while(length>0){                    //每次写入length长度的内容                    fos.write(buffer,0,length);                    length=fis.read(buffer);                }                fis.close();                fos.flush();                fos.close();        return SUCCESS;    }    public String getSavePath(){        return ServletActionContext.getServletContext().getRealPath(savePath);    }}
4.如果成功就去找成功页面
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><%@ taglib prefix="s" uri="/struts-tags" %><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="http://www.mamicode.com/">    <title>文件上传</title>  </head>  <body>  <!--成功页面  --> 上传文件成功！ 您上传的文件是：<s:property value="http://www.mamicode.com/uploadFileName"/><br/> 文件类型:<s:property value="http://www.mamicode.com/uploadContentType"/>  </body></html>
　　
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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