Struts2的檔案上傳和下載(1)單檔案上傳
阿新 • • 發佈:2018-11-10
在struts2中整合fileuoload功能,因為在匯入的jar包中包含了common-fileipload.jar檔案
在struts2中的interceptor 中有一個fileupload攔截器,他的主要功能就是完成檔案上傳。
注意事項
- method=post
- 所有元件必須有name
- encType=multipart/form-data
Struts2上傳步驟
- 在頁面上建立表單
- 建立Action,在action中定義三個變數用來接收上傳資訊
- 使用FileUtils的copyFile方法完成檔案複製操作
FileUploadAction.java
package com.qwl.action;
import java.io.File;
import java.io.IOException;
import org.apache.commons.io.FileUtils;
import com.opensymphony.xwork2.ActionSupport;
public class FileUploadAction extends ActionSupport{
private static final long serialVersionUID=1L;
//提交過來的檔案
private File file;
//提交過來的file的名字
private String fileFileName;
//提交過來的file的型別
private String fileContentType;
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 execute()throws Exception{
/*System.out.println(file.getCanonicalPath());
System.out.println(this.fileContentType);
System.out.println(this.fileFileName);*/
//流操作
/*//檔案輸入流
InputStream is=new FileInputStream(file);
//設定檔案的儲存目錄
String uploadPath=ServletActionContext.getServletContext().getRealPath("/upload");
//設定目標檔案
File toFile=new File(uploadPath,this.getFileFileName());
//檔案輸出流
OutputStream os=new FileOutputStream(toFile);
byte[] buffer=new byte[1024];
int length=0;
//讀取file檔案輸出到toFile檔案中
while(-1!=(length=is.read(buffer,0,buffer.length)))
{
os.write(buffer);
}
//關閉輸入流和輸出流
is.close();
os.close();*/
writeFile();
return SUCCESS;
}
public void writeFile() throws IOException{
FileUtils.copyFile(file,new File("/upload",fileFileName));
}
}
}
fileUpload.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>檔案上傳</title>
</head>
<body>
<s:form action="fileUpload" method="post" enctype="multipart/form-data">
<s:file name="file" label="檔案上傳"></s:file>
<s:submit value="上傳"/>
<s:reset value="重置"/>
</s:form>
</body>
</html>
result.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>檔案上傳</title>
</head>
<body>
<s:form action="fileUpload" method="post" enctype="multipart/form-data">
<s:file name="file" label="檔案上傳"></s:file>
<s:submit value="上傳"/>
<s:reset value="重置"/>
</s:form>
</body>
</html>
struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
"http://struts.apache.org/dtds/struts-2.5.dtd">
<struts>
<package name="struts2" namespace="/" extends="struts-default">
<action name="fileUpload" class="com.qwl.action.FileUploadAction">
<result name="success">/result.jsp</result>
</action>
</package>
</struts>