Two implementations of struts2 single file upload
- 2020-04-01 02:41:53
- OfStack
There are 2 ways to simulate a single file upload, as shown below
< img border = 0 SRC = "/ / files.jb51.net/file_images/article/201401/201413152445743.jpg" >
The development steps are as follows:
1. Create a new web project and import the jars required for struts2 to upload files, as shown in the following figure
< img border = 0 SRC = "/ / files.jb51.net/file_images/article/201401/201413152550629.png" >
The directory structure
< img border = 0 SRC = "/ / files.jb51.net/file_images/article/201401/201413152726133.png" >
2. Create new Action
The first way
package com.ljq.action;
import java.io.File;
import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")
public class UploadAction extends ActionSupport{
private File image; //Uploaded file
private String imageFileName; //The file name
private String imageContentType; //The file type
public String execute() throws Exception {
String realpath = ServletActionContext.getServletContext().getRealPath("/images");
//D:apache-tomcat-6.0.18webappsstruts2_uploadimages
System.out.println("realpath: "+realpath);
if (image != null) {
File savefile = new File(new File(realpath), imageFileName);
if (!savefile.getParentFile().exists())
savefile.getParentFile().mkdirs();
FileUtils.copyFile(image, savefile);
ActionContext.getContext().put("message", " File uploaded successfully ");
}
return "success";
}
public File getImage() {
return image;
}
public void setImage(File image) {
this.image = image;
}
public String getImageFileName() {
return imageFileName;
}
public void setImageFileName(String imageFileName) {
this.imageFileName = imageFileName;
}
public String getImageContentType() {
return imageContentType;
}
public void setImageContentType(String imageContentType) {
this.imageContentType = imageContentType;
}
}
The second way
package com.ljq.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")
public class UploadAction2 extends ActionSupport {
//Encapsulates the properties of the upload file field
private File image;
//Encapsulates the properties of the upload file type
private String imageContentType;
//Encapsulates the property of the upload file name
private String imageFileName;
//Accept dependency injection properties
private String savePath;
@Override
public String execute() {
FileOutputStream fos = null;
FileInputStream fis = null;
try {
//Creates a file output stream
System.out.println(getSavePath());
fos = new FileOutputStream(getSavePath() + "\" + getImageFileName());
//Set up file flow
fis = new FileInputStream(getImage());
byte[] buffer = new byte[1024];
int len = 0;
while ((len = fis.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
} catch (Exception e) {
System.out.println(" File upload failed ");
e.printStackTrace();
} finally {
close(fos, fis);
}
return SUCCESS;
}
public String getSavePath() throws Exception{
return ServletActionContext.getServletContext().getRealPath(savePath);
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
public File getImage() {
return image;
}
public void setImage(File image) {
this.image = image;
}
public String getImageContentType() {
return imageContentType;
}
public void setImageContentType(String imageContentType) {
this.imageContentType = imageContentType;
}
public String getImageFileName() {
return imageFileName;
}
public void setImageFileName(String imageFileName) {
this.imageFileName = imageFileName;
}
private void close(FileOutputStream fos, FileInputStream fis) {
if (fis != null) {
try {
fis.close();
} catch (IOException e) {
System.out.println("FileInputStream Close the failure ");
e.printStackTrace();
}
}
if (fos != null) {
try {
fos.close();
} catch (IOException e) {
System.out.println("FileOutputStream Close the failure ");
e.printStackTrace();
}
}
}
}
Struts.xml configuration file
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<!-- This property specifies the requirements Struts2 The request suffix processed, the default value of this property is action , that is, all matches *.action Request by Struts2 To deal with.
If the user needs to specify multiple request suffixes, the suffixes are separated by an English comma ( , Separated). -->
<constant name="struts.action.extension" value="do" />
<!-- Sets whether the browser caches static content , The default value is true( Used in production environment ), The development phase is best closed -->
<constant name="struts.serve.static.browserCache" value="false" />
<!-- when struts The configuration file is modified , Does the system automatically reload the file , The default value is false( Used in production environment ), The development phase is best opened -->
<constant name="struts.configuration.xml.reload" value="true" />
<!-- Use in development mode , This will print out more detailed error messages -->
<constant name="struts.devMode" value="true" />
<!-- The default view theme -->
<constant name="struts.ui.theme" value="simple" />
<!--<constant name="struts.objectFactory" value="spring" />-->
<!-- To solve the code -->
<constant name="struts.i18n.encoding" value="UTF-8" />
<!-- Specifies the maximum number of bytes of files allowed to be uploaded. The default value is 2097152(2M) -->
<constant name="struts.multipart.maxSize" value="10701096"/>
<!-- Set up a temporary folder for uploading files , Use the default javax.servlet.context.tempdir -->
<constant name="struts.multipart.saveDir " value="d:/tmp" />
<package name="upload" namespace="/upload" extends="struts-default">
<action name="*_upload" class="com.ljq.action.UploadAction" method="{1}">
<result name="success">/WEB-INF/page/message.jsp</result>
</action>
</package>
<package name="upload2" extends="struts-default">
<action name="upload2" class="com.ljq.action.UploadAction2" method="execute">
<!-- Dynamic setting savePath The attribute value -->
<param name="savePath">/images</param>
<result name="success">/WEB-INF/page/message.jsp</result>
<result name="input">/upload/upload.jsp</result>
<interceptor-ref name="fileUpload">
<!-- File filter -->
<param name="allowedTypes">image/bmp,image/png,image/gif,image/jpeg</param>
<!-- The file size , In bytes -->
<param name="maximumSize">1025956</param>
</interceptor-ref>
<!-- The default interceptor must be placed fileUpload After that, otherwise invalid -->
<interceptor-ref name="defaultStack" />
</action>
</package>
</struts>
Upload form page
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title> File upload </title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<body>
<!-- ${pageContext.request.contextPath}/upload/execute_upload.do -->
<!-- ${pageContext.request.contextPath}/upload2/upload2.do -->
<form action="${pageContext.request.contextPath}/upload2/upload2.do"
enctype="multipart/form-data" method="post">
file :<input type="file" name="image">
<input type="submit" value=" upload " />
</form>
<br/>
<s:fielderror />
</body>
</html>
Display results page
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title> Uploaded successfully </title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<body>
Upload successful!
<br/><br/>
<!-- ${pageContext.request.contextPath} tomcat Deployment path,
Such as: D:apache-tomcat-6.0.18webappsstruts2_upload -->
<img src="${pageContext.request.contextPath}/<s:property value="'images/'+imageFileName"/>">
<s:debug></s:debug>
</body>
</html>