Struts2文件上传
1.单个文件上传:
a.首先建立一个jsp
<%@taglib uri="/struts-tags" prefix="s"%> <s:actionerror/><br/> <!--注意：添加命名空间、否则在第一次上传之后地址将发生改变--> <!--注意：2.enctype规定上传类型 否则上传文件在那头会出错--> <s:form action="upload" enctype="multipart/form-data" namespace="/"> <!--做标记用 用来判断是否重复登陆--> <s:token/> <s:file name="myFile" label="文件上传"/> <s:textfield name="name" label="用户名"/> <s:submit value="提交"/> </s:form>
注意：<s:token/>防止重复登陆，不能够返回之后重新提交。必须要刷新页面
b.Struts.xml配置
<package name="my" namespace="/" extends="struts-default"> <action name="upload" class="com.yc.struts.action.MyFileUploadAction"> <result>/success.jsp</result> </action> </package>
c.创建MyFileUploadAction类 继承ActionSupport
private File myFile;// 上传来的文件
private String myFileContentType;// 上传文件的类型
private String myFileFileName;// 上传文件的名字
实现get set方法
d.重写execute方法
public String execute() throws Exception {
//1.获得输入流
InputStream in=new FileInputStream(myFile);
//2.获得文件存储路径
//路径为C:\Program Files (x86)\apache-tomcat-7.0.47\webapps\struts2-mvc09-fileupload\upload
//tomcat下webapps 项目名
File toDir=new File(ServletActionContext.getServletContext().getRealPath("/upload"));
//3.判断是文件路径是否存在，不存在则创建文件
if(toDir.exists()==false){
toDir.mkdir();
}
System.out.println(toDir.getAbsolutePath());
//4.输出流
OutputStream out=new FileOutputStream(new File(toDir,myFileFileName));
byte[] bs=new byte[1024];
int len=0;
while((len=in.read(bs))!=-1){
out.write(bs,0,len);
}
out.flush();
in.close();
out.close();
return "success";
}
2.多个文件上传
方式一:
a.jsp
<s:form action="upload" enctype="multipart/form-data" namespace="/"> <s:token/> <s:file name="myFile" label="上传文件"/> <s:file name="myFile" label="上传文件"/> <s:file name="myFile" label="上传文件"/> </s:form>
b.struts.xml配置
<package name="my" namespace="/" extends="struts-default"> <action name="upload" class="com.yc.struts.action.MyFileUploadAction"> <result>/success.jsp</result> </action> </package>
c.创建MyFilesUploadAction类 继承ActionSupport
public class MyFilesUploadAction extends ActionSupport {
//多中文件上传会 需要采用List<存>
private List<File> myFile;// 上传来的文件
private List<String> myFileContentType;// 上传文件的类型
private List<String> myFileFileName;// 上传文件的名字
public List<File> getMyFile() {
return myFile;
}
public void setMyFile(List<File> myFile) {
this.myFile = myFile;
}
public List<String> getMyFileContentType() {
return myFileContentType;
}
public void setMyFileContentType(List<String> myFileContentType) {
this.myFileContentType = myFileContentType;
}
public List<String> getMyFileFileName() {
return myFileFileName;
}
public void setMyFileFileName(List<String> myFileFileName) {
this.myFileFileName = myFileFileName;
}
@Override
public String execute() throws Exception {
InputStream in = null;
OutputStream out = null;
File toDir = new File(ServletActionContext.getServletContext()
.getRealPath("/upload"));
if (toDir.exists() == false) {
toDir.mkdir();
}
for (int i = 0; i < myFile.size(); i++) {
in = new FileInputStream(myFile.get(i));
System.out.println(toDir.getAbsolutePath());
out = new FileOutputStream(new File(toDir, myFileFileName.get(i)));
byte[] bs = new byte[1024];
int len = 0;
while ((len = in.read(bs)) != -1) {
out.write(bs, 0, len);
}
out.flush();
}
in.close();
out.close();
return "success";
}
}
3.多文件上传
方式二:使用Struts工具类 只需要更改execute()方法:
public String execute() throws Exception {
System.out.println(myFile);
System.out.println(myFileContentType);
System.out.println(myFileFileName);
File toDir = new File(ServletActionContext.getServletContext().getRealPath("/upload"));
if (toDir.exists() == false) {
toDir.mkdir();
}
for (int i = 0; i < myFile.size(); i++) {
//struts2框架中提供的文件操作帮助类
FileUtils.copyFile(myFile.get(i), new File(toDir,myFileFileName.get(i)));
}
return "success";
}
4. 上传参数控制
<package name="my" namespace="/" extends="struts-default"> <action name="upload" class="com.yc.struts.action.MyFilesUploadAction"> <interceptor-ref name="token"/> <interceptor-ref name="defaultStack"> <param name="fileUpload.maximumSize">2097512</param><!--允许上传的文件大小--> <param name="fileUpload.allowedTypes">text/plain,text/html</param><!-- 允许的文件类型 --> <param name="fileUpload.allowedExtensions">txt,html,htm,log</param><!-- 允许的文件拓展名 --> </interceptor-ref> <result>/success.jsp</result> <result name="input">/index.jsp</result> </action> </package>
5.下载
a.配置struts.xml
<action name="down" class="com.yc.struts.action.MyDownloadAction"> <result type="stream"> <param name="bufferSize">1024</param> </result> </action>
注意:此处标记 结果类型为 stream
b.创建MyDownloadAction
package com.yc.struts.action;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.URLEncoder;
import org.apache.struts2.ServletActionContext;
public class MyDownloadAction {
protected String contentType;//下载内容类型
protected long contentLength;//下载内容长度
protected String contentDisposition;//下载内容配置(名字)
protected InputStream inputStream;//输入流
public String execute() throws Exception{
contentType="text/html";
//contentDisposition="attachment;filename="+new String("你好.html".getBytes(), "iso-8859-1");
contentDisposition="attachment;filename="+URLEncoder.encode("你好.html", "iso-8859-1");//转码 firebug不会识别这个utf-8
String downloadPath=ServletActionContext.getServletContext().getRealPath("/upload/a.html");
inputStream=new FileInputStream(downloadPath);
contentLength=inputStream.available();
return "success";
}
public String getContentType() {
return contentType;
}
public void setContentType(String contentType) {
this.contentType = contentType;
}
public long getContentLength() {
return contentLength;
}
public void setContentLength(long contentLength) {
this.contentLength = contentLength;
}
public String getContentDisposition() {
return contentDisposition;
}
public void setContentDisposition(String contentDisposition) {
this.contentDisposition = contentDisposition;
}
public InputStream getInputStream() {
return inputStream;
}
public void setInputStream(InputStream inputStream) {
this.inputStream = inputStream;
}
}
原文：http://my.oschina.net/yedianxiaoxinxin/blog/299611