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最近在学习ssh框架，我用ssh框架写了一个文件上传下载的实例代码，有需要了解的朋友可参考。希望此文章对各位有所帮助。
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="Author" content="BuNuo">
<meta name="Keywords" content="文件上传下载">
<meta name="Description" content="ssh框架文件上传下载">
<title>Document</title>
</head>
<body>
<form action="newFile" method="post" enctype="multipart/form-data">
<input type="file" name="file">
<input type="submit" value="上传">
</form>
<a href="downFile?filename=${filename}" rel="external nofollow" >下载</a>
</body>
</html>
</div>
package com.cpsec.tang.chemical.action;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;
import org.springframework.stereotype.Controller;
import com.opensymphony.xwork2.ActionSupport;
@Controller("newFileAction")
public class NewFileAction extends ActionSupport {
private File file;//文件
private String fileFileName;//文件名称
private String fileContentType; //文件类型
private String filename;
private InputStream inputStream;
public String newFile(){
File dir=new File(ServletActionContext.getServletContext().getRealPath("files"));
//判断文件是否上传，如果上传的话将会创建该目录
if(!dir.exists()){
dir.mkdir(); //创建该目录
}
System.out.println(file);
System.out.println(fileFileName);
//第一种文件上传的方法
//声明文件输入流，为输入流指定文件路径
//获取输出流，获取文件的文件地址及名称
FileInputStream in=null;
FileOutputStream out=null;
try{
in= new FileInputStream(file);
out=new FileOutputStream(dir + "\\" +fileFileName);
byte[] b=new byte[1024*1024];//每次写入的大小
int i=0;
while((i=in.read(b))>0){
out.write(b,0,i);
}
in.close();
out.close();
}catch(Exception e){
e.printStackTrace();
}finally{
}
/*//第二种文件上传的方法
try {
FileUtils.copyFile(file,new File(dir,fileFileName));
} catch (IOException e) {
e.printStackTrace();
}
//第三种方法
BufferedReader bReader=null;
BufferedWriter bWriter=null;
try{
bReader = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
bWriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(dir+"\\"+fileFileName)));
char[] str=new char[1024*1024];
int i=0;
while((i=bReader.read(str))>0){
bWriter.write(str,0,i);
}
bReader.close();
bWriter.close();
dir.delete();
}catch(Exception e){
e.printStackTrace();
}finally{
} */
return SUCCESS;
}
public String downFile(){
System.out.println(filename);
inputStream=ServletActionContext.getServletContext().getResourceAsStream("/files/"+filename);
System.out.println(inputStream);
return SUCCESS;
}
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 getFilename() {
return filename;
}
public void setFilename(String filename) {
this.filename = filename;
}
public InputStream getInputStream() {
return inputStream;
}
public void setInputStream(InputStream inputStream) {
this.inputStream = inputStream;
}
}
</div>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<package name="newFileAction" namespace="/" extends="struts-default">
<action name="downFile" class="newFileAction" method="downFile">
<result name="success" type="stream">
<param name="contentType">application/octet-stream;charset=ISO8859-1</param>
<!-- inputName 流对象名 —— 比如这里写inputStream，它就会自动去找Action中的getInputStream方法。 -->
<param name="inputName">inputStream</param>
<!-- contentDisposition 使用经过转码的文件名作为下载文件名 —— 默认格式是attachment;filename="${fileName}"，将调用该Action中的getFileName方法。 -->
<param name="contentDisposition">attachment;filename=${filename}</param>
<!-- bufferSize 下载文件的缓冲大小 -->
<param name="bufferSize">4096</param>
</result>
</action>
</package>
</struts>
</div>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
</div>