Struts的拦截器和文件上传下载

拦截器

首先新建一个拦截器的类,类实现Interceptor接口,记得是xwork2包下的

重写三个方法,在intercept的方法中执行拦截器前后需要执行的操作,

执行前后的区分为

String invoke=actionInvocation.invoke();//放行

在这行代码前就是执行前的操作,在这行代码后就是执行后的操作

 

然后就是配置xml文件

配置拦截器

<!--拦截器-->
<interceptors>
    <interceptor name="oneInterceptor" class="com.hw.one.five.OneInterceptor"></interceptor>
</interceptors>
再就是配置需要使用拦截器的action
<action name="Interceptor" class="com.hw.one.web.Interceptor">
    <interceptor-ref name="oneInterceptor"> </interceptor-ref>
</action>
拦截器就完成了

上传

配置xml就不多说了

新建action类,然后继承baseAction

设置四个属性

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

public class UploadsAction extends BaseAction{
    private File[] file;
    private String[] fileFileName;
    private String[] fileContentType;
    private String serverDir = "/Upload";

    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;
    }
    /**
     * 获取文件夹的真实路径
     *
     * @param Path
     * @return
     */
    private String getRealPath(String Path) {
        return this.request.getServletContext().getRealPath(Path);
    }



    /**
     * 上传
     *
     * @return
     */
    public String upload() throws IOException {
        for (int i = 0; i < file.length; i++) {
            System.out.println("名字" + fileFileName[i]);
            System.out.println("类型" + fileContentType[i]);
            //真实路径  ,文件名前面加上uuid是因为可能会因为文件名相同而覆盖
            String realPath = getRealPath(serverDir + "/" + UUID.randomUUID().toString() +fileFileName[i]);
            System.out.println(realPath);
            //复制
            FileUtils.copyFile(file[i], new File(realPath));
        }
        

        return "Interceptor";
    }

}

BaseAction

package com.hw.one.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();
	}
	

}



单个文件上传见上篇博客