Struts的拦截器和文件上传下载

太过爱你忘了你带给我的痛 2022-04-16 00:07 121阅读 0赞

### **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

<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