struts文件的上传、下载、查看

上传的上传、下载、查看

配置xml就不多说了

新建action类,然后继承baseAction（我把baseAction的内容丢最下面）

设置四个属性

给这四个属性设置get、set方法

private File file;
private String fileFileName;
private String fileContentType;
/**
 * 虚拟路径
 * 虚拟路径是存在服务器中,真实路径是本地
 */
private String serverDir = "/Upload";
获取文件夹的真实路径
private String getRealPath(String Path) {
    return this.request.getServletContext().getRealPath(Path);
}
上传
public String upload() throws IOException {
    System.out.println("名字" + fileFileName);
    System.out.println("类型" + fileContentType);
    //真实路径
    String realPath = getRealPath(serverDir + "/" + fileFileName);
    System.out.println(realPath);
    //复制
    FileUtils.copyFile(file, new File(realPath));
    return "Interceptor";
}
 
下载
public String save() throws IOException {
    //数据库获得
    String filename = "img1.jpg";
    String filetype="image/jpg";
    response.setContentType(filetype);
    response.setHeader("Content-Disposition","attachment;filename=" + filename);
    String realPath=getRealPath(serverDir + "/" + filename);
    FileUtils.copyFile(new File(realPath),response.getOutputStream());
    return null;
}
 
直接显示图片
public String open() throws IOException {
    //数据库获得
    String filename = "img1.jpg";
    String filetype="image/jpg";
    response.setContentType(filetype);
    response.setHeader("Content-Disposition","filename=" + filename);
    String realPath=getRealPath(serverDir + "/" + filename);
    FileUtils.copyFile(new File(realPath),response.getOutputStream());
    return null;
}

baseAction的的代码

 

package com.hhh.web;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;

/**
 * 每一个开发的子控制器要用的属性都定义在通用的action中。
 * @author Administrator
 *
 */
public class BaseAction implements ServletRequestAware, ServletResponseAware{
	/**
	 * 为了传值使用
	 */
	protected HttpServletResponse response;
	protected HttpServletRequest request;
	protected HttpSession session;
	protected ServletContext application;
	
	/**
	 * 为了配置跳转页面所用
	 */
	protected final static String SUCCESS = "success";
	protected final static String FAIL = "fail";
	protected final static String LIST = "list";
	protected final static String ADD = "add";
	protected final static String EDIT = "edit";
	protected final static String DETAIL = "detail";
	
	/**
	 * 具体传值字段	后端向jsp页面传值所用字段
	 */
	protected Object result;
	protected Object msg;
	protected int code;

	public Object getResult() {
		return result;
	}

	public Object getMsg() {
		return msg;
	}

	public int getCode() {
		return code;
	}

	@Override
	public void setServletResponse(HttpServletResponse arg0) {
		this.response = arg0;
		
	}

	@Override
	public void setServletRequest(HttpServletRequest arg0) {
		this.request = arg0;
		this.session = arg0.getSession();
		this.application = arg0.getServletContext();
	}
	

}