20171023_chr_classupload Struts2字节流完成文件上传

最新推荐文章于 2022-05-31 10:46:01 发布

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本文介绍了一个使用Struts2框架实现文件上传的具体案例，包括了上传Action的编写及配置，通过字节流方式将文件从客户端传输到服务器。

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字节流完成文件上传

/20171023_chr_classupload/src/nuc/sw/action/UploadAction.java

package nuc.sw.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.UUID;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {
      private String title;
      private File upload;
      private String uploadContentType;
      private String uploadFileName;
      private String savePath;
      public String getTitle() {
        return title;
      }
      public void setTitle(String title) {
        this.title = title;
      }
      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 String getSavePath() {
        return savePath;
      }
      public void setSavePath(String savePath) {
        this.savePath = savePath;
      }
      //处理上传文件的方法
      public String upload() throws IOException{
          //了解三个参数概念
          System.out.println(upload);
          System.out.println(uploadContentType);
          System.out.println(uploadFileName);
          //完成上传,用字节流（二进制形式）
          try {
            FileInputStream fis=new FileInputStream(upload);
            String newFileName=UUID.randomUUID().toString()+"_"+uploadFileName;
            FileOutputStream fos=new FileOutputStream(savePath+"/"+newFileName);
            byte[] buffer=new byte[1024];
            int len=0;
            while((len=fis.read(buffer))>0) {
                fos.write(buffer, 0, len);
            }
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }     
          return "uploadOK";
      }
}

/20171023_chr_classupload/src/struts.xml

<struts>
    <constant name="struts.multipart.saveDir" value="f:/upload"></constant>
    <!-- Add packages here -->
    <package name="uploadPackage" namespace="/" extends="struts-default">
      <action name="uploadAction" class="nuc.sw.action.UploadAction" method="upload">
       <interceptor-ref name="fileUpload">
        <param name="allowedExtensions">txt,doc,docx,jpg</param>
        <param name="maximumSize">1024000</param>
        <param name="allowedTypes">text/plain</param>
       </interceptor-ref>
       <interceptor-ref name="defaultStack"></interceptor-ref>
       <param name="savePath">f:/uploadRealFile</param>
       <result name="uploadOK">
        /success.jsp
       </result>
       <result name="input">
        /upload.jsp
       </result>
      </action>
     </package>
</struts>

/20171023_chr_classupload/WebContent/success.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>成功页</title>
</head>
<body>
  上传成功！！！
</body>
</html>

/20171023_chr_classupload/WebContent/upload.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!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>文件上传页</title>
</head>
<body>
 <s:fielderror></s:fielderror>
 <s:form action="uploadAction" method="post" enctype="multipart/form-data">
  <s:textfield label="文件主题" name="title"></s:textfield>
  <s:file label="选择文件" name="upload"></s:file>
  <s:submit value="上传"></s:submit>
 </s:form>
</body>
</html>