Struts2 文件上传与下载
上传 控制层代码
package cn.yunhe.struts.controller;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import cn.yunhe.struts.model.UserModel;
public class UserController extends ActionSupport implements ModelDriven<Object>{
private static final long serialVersionUID = 1L;
private UserModel um;
/**
* 账户名称
*/
private String username;
/**
* 用户头像
*
* file并不是指前端JSP上传过来的文件本身，而是文件上传过来存放在临时文件夹下面的文件
*/
private File userhead;
/**
* 用户头像文件名
* 提交过来的file的名字[文件名FileName]
*/
private String userheadFileName;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public File getUserhead() {
return userhead;
}
public void setUserhead(File userhead) {
this.userhead = userhead;
}
public String getUserheadFileName() {
return userheadFileName;
}
public void setUserheadFileName(String userheadFileName) {
this.userheadFileName = userheadFileName;
}
public void uploadFile() throws IOException{
System.out.println("um.getNickname():"+um.getNickname());
//保存上传文件的路径
String root = ServletActionContext.getServletContext().getRealPath("/upload");
//获取临时文件输入流
InputStream is = new FileInputStream(userhead);
System.out.println(root);
System.out.println(userheadFileName);
//输出文件
OutputStream os = new FileOutputStream(new File(root, userheadFileName));
//打印出上传的文件的文件名
System.out.println("fileFileName: " + userheadFileName);
//因为file是存放在临时文件夹的文件，我们可以将其文件名和文件路径打印出来，看和之前的fileFileName是否相同
System.out.println("file: " + userhead.getName());
System.out.println("file: " + userhead.getPath());
byte[] buffer = new byte[1024];
int len = 0;
//循环，从输入流中每次读取buffer大小的字节数组到buffer字节数组中，read返回值为读取到的字节数组的真实大小，并赋值给len变量
//如果读取到文件的结尾则会read返回-1赋值给len变量
while((len = is.read(buffer))!=-1){
System.out.println("len:"+len);
//将每次读取的字节数据(从第0位到第len位)，写入到文件输出流中
os.write(buffer,0,len);
}
os.close();
is.close();
}
public UserModel getModel() {
if(um==null){
um = new UserModel();
um.setUsername("zhagnsan");
um.setNickname("nihao");
}
return um;
}
}
上传页面代码
<!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">
<script type="text/javascript" src="layui/layui.js"></script>
<link rel="stylesheet" href="layui/css/layui.css" media="all" >
<title>Insert title here</title>
</head>
<script type="text/javascript">
</script>
<body>
<form class="layui-form layui-form-pane" method="post" action="/user/user101" enctype="multipart/form-data" >
<div class="layui-form-item">
<label class="layui-form-label">用户名：</label>
<div class="layui-input-block">
<input type="text" name="title" placeholder="请输入用户名" class="layui-input">
</div>
</div>
<div class="layui-form-item">
<label class="layui-form-label">用户头像：</label>
<div class="layui-input-block">
<input type="file" name="userhead" >
<input type="submit" value="提交" class="layui-btn layui-btn-normal">
</div>
</div>
</form>
</body>
</html>
配置文件：
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<package name="yunhe-user" namespace="/user" extends="struts-default">
<interceptors>
<interceptor name="cslanjie" class="cn.yunhe.struts.interceptor.CeshiInterceptor"></interceptor>
</interceptors>
<action name="upload" class="cn.yunhe.struts.controller.UserController" method="uploadFile">
<!-- 传文件拦截器必须得用ActionSupport -->
<interceptor-ref name="fileUpload">
<!-- 单位是字节bytes(*号不能写，代表正则表达式匹配所有) -->
<param name="maximumSize">10240000000000</param>
<param name="allowedTypes">image/bmp,image/jpg,image/jpeg,image/png,image/gif,image/pjepg</param>
<param name="allowedExtensions">png,bmp,jpg,jpeg,gif</param>
</interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
<!-- 如果文件上传类型错误或者文件大小不满足，自动跳转到input类型结果，此name为struts约定的固定名字 -->
<result name="input">/index.jsp</result>
</action>
<action name="download" class="cn.yunhe.struts.controller.DownController">
<result name="success" type="stream">
<param name="contentDisposition">attachment;filename="${fileName}"</param>
<param name="inputName">ab</param>
</result>
</action>
</package>
</struts>
下载控制层代码：
package cn.yunhe.struts.controller;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class DownController extends ActionSupport {
private static final long serialVersionUID = 1L;
// 要下载文件在服务器上的路径
private String fileid;
// 要下载文件的文件名
private String fileName;
public String getFileid() {
return fileid;
}
public void setFileid(String fileid) {
this.fileid = fileid;
}
public static long getSerialversionuid() {
return serialVersionUID;
}
public String getFileName() {
return fileName;
}
public void setFileName(String fileName) {
this.fileName = fileName;
}
public InputStream getAb() {
//TODO:根据fileid去数据库查询对应的用户上传的原始文件名filename
//TODO:以下为模拟数据
Map<String,String> fileMap = new HashMap<String,String>();
fileMap.put("10010", "zhangsan.jpg");
fileMap.put("10012", "lisi.png");
this.fileName = fileMap.get(fileid);
return ServletActionContext.getServletContext().getResourceAsStream("/upload/" + "222222.png");
}
public String execute() throws Exception {
return SUCCESS;
}
}
下载页面：
<!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> </head> <body> <a href="http://127.0.0.1:8080/upload/Hydrangeas.jpg">点击下载 图 片1</a> <a href="http://127.0.0.1:8080/user/down?fileid=10012">点击下载 图片2</a> </body> </html>