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Aja's asynchronous upload plug-in

php中世界最好的语言Original: 2018-03-15 17:38:171570browse

This time I bring you aja's asynchronous upload plug-in. What are the precautions when using aja's asynchronous upload plug-in? The following is a practical case, let's take a look.

The example in this article shares how to use the ajaxfileupload asynchronous upload plug-in for your reference. The specific content is as follows

The server uses struts2 to handle file upload.

Required environment:
jquery.js
ajaxfileupload.js
jar package that struts2 depends on
and struts2-json-plugin-2.1.8.1.jar

Write the Action for file upload

package com.ajaxfile.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")
public class FileAction extends ActionSupport {
  private File file;
  private String fileFileName;
  private String fileFileContentType;
  private String message = "你已成功上传文件";
  
  public String getMessage() {
    return message;
  }
  public void setMessage(String message) {
    this.message = message;
  }
  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 getFileFileContentType() {
    return fileFileContentType;
  }
  public void setFileFileContentType(String fileFileContentType) {
    this.fileFileContentType = fileFileContentType;
  }
  @SuppressWarnings("deprecation")
  @Override
  public String execute() throws Exception {
    
    String path = ServletActionContext.getRequest().getRealPath("/upload");
    try {
      File f = this.getFile();
      if(this.getFileFileName().endsWith(".exe")){
        message="对不起,你上传的文件格式不允许!!!";
        return ERROR;
      }
      FileInputStream inputStream = new FileInputStream(f);
      FileOutputStream outputStream = new FileOutputStream(path + "/"+ this.getFileFileName());
      byte[] buf = new byte[1024];
      int length = 0;
      while ((length = inputStream.read(buf)) != -1) {
        outputStream.write(buf, 0, length);
      }
      inputStream.close();
      outputStream.flush();
    } catch (Exception e) {
      e.printStackTrace();
      message = "对不起,文件上传失败了!!!!";
    }
    return SUCCESS;
  }
}

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
  <package name="struts2" extends="json-default">
    <action name="fileUploadAction" class="com.ajaxfile.action.FileAction">
      <result type="json" name="success">
        <param name="contentType">
          text/html
        </param>
      </result>
      <result type="json" name="error">
        <param name="contentType">
          text/html
        </param>
      </result>
    </action>
  </package>
</struts>

Pay attention to observe the configuration of result in struts.xml in combination with Action.

The contentType parameter must be present, otherwise the browser will always prompt to save the returned JSON result as a file and will not hand it over to ajaxfileupload for processing. This is because the default contentType of struts2 JSON Plugin is application/json, while ajaxfileupload requires text/html.

JSP page for file upload

<%@ 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>
    <script type="text/javascript" src="js/jquery.js"></script>
    <script type="text/javascript" src="js/ajaxfileupload.js"></script>
    <script type="text/javascript">
  function ajaxFileUpload()
  {
    
    $("#loading")
    .ajaxStart(function(){
      $(this).show();
    })//开始上传文件时显示一个图片
    .ajaxComplete(function(){
      $(this).hide();
    });//文件上传完成将图片隐藏起来
    
    $.ajaxFileUpload
    (
      {
        url:'fileUploadAction.action',//用于文件上传的服务器端请求地址
        secureuri:false,//一般设置为false
        fileElementId:'file',//文件上传空间的id属性 <input type="file" id="file" name="file" />
        dataType: 'json',//返回值类型 一般设置为json
        success: function (data, status) //服务器成功响应处理函数
        {
          alert(data.message);//从服务器返回的json中取出message中的数据,其中message为在struts2中action中定义的成员变量
          
          if(typeof(data.error) != 'undefined')
          {
            if(data.error != '')
            {
              alert(data.error);
            }else
            {
              alert(data.message);
            }
          }
        },
        error: function (data, status, e)//服务器响应失败处理函数
        {
          alert(e);
        }
      }
    )
    
    return false;
  }
  </script>
  </head>
  <body>
    <img src="loading.gif" id="loading" style="display: none;">
    <input type="file" id="file" name="file" />
    <br />
    <input type="button" value="上传" onclick="return ajaxFileUpload();">
  </body>
</html>

Pay attention to the code in , there is no form. The ajaxFileUpload() method is only triggered when the button is clicked. What needs to be noted is the order in which js files are introduced. ajaxfileupload.js depends on jquery, so you know.

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

Aja's asynchronous upload plug-in

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