攔截器

首先新建一個攔截器的類,類實現Interceptor介面,記得是xwork2包下的

重寫三個方法,在intercept的方法中執行攔截器前後需要執行的操作,

執行前後的區分為

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

在這行程式碼前就是執行前的操作,在這行程式碼後就是執行後的操作

然後就是配置xml檔案

配置攔截器

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

上傳

配置xml就不多說了

新建action類,然後繼承baseAction

設定四個屬性

private File file;
private String fileFileName;
private String fileContentType;
/**
 * 虛擬路徑
 * 虛擬路徑是存在伺服器中,真實路徑是本地
 */
private String serverDir = "/Upload";
獲取資料夾的真實路徑
private String getRealPath(String Path) {
    return this.request.getServletContext().getRealPath(Path);
}
上傳
public String upload() throws IOException {
    System.out.println("名字" + fileFileName);
    System.out.println("型別" + fileContentType);
    //真實路徑
    String realPath = getRealPath(serverDir + "/" + fileFileName);
    System.out.println(realPath);
    //複製
    FileUtils.copyFile(file, new File(realPath));
    return "Interceptor";
}

下載
public String save() throws IOException {
    //資料庫獲得
    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;
}

直接顯示圖片
public String open() throws IOException {
    //資料庫獲得
    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;
    }
    /**
     * 獲取資料夾的真實路徑
     *
     * @param Path
     * @return
     */
    private String getRealPath(String Path) {
        return this.request.getServletContext().getRealPath(Path);
    }



    /**
     * 上傳
     *
     * @return
     */
    public String upload() throws IOException {
        for (int i = 0; i < file.length; i++) {
            System.out.println("名字" + fileFileName[i]);
            System.out.println("型別" + fileContentType[i]);
            //真實路徑  ,檔名前面加上uuid是因為可能會因為檔名相同而覆蓋
            String realPath = getRealPath(serverDir + "/" + UUID.randomUUID().toString() +fileFileName[i]);
            System.out.println(realPath);
            //複製
            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;

/**
 * 每一個開發的子控制器要用的屬性都定義在通用的action中。
 * @author Administrator
 *
 */
public class BaseAction implements ServletRequestAware, ServletResponseAware{
	/**
	 * 為了傳值使用
	 */
	protected HttpServletResponse response;
	protected HttpServletRequest request;
	protected HttpSession session;
	protected ServletContext application;
	
	/**
	 * 為了配置跳轉頁面所用
	 */
	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";
	
	/**
	 * 具體傳值欄位	後端向jsp頁面傳值所用欄位
	 */
	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();
	}
	

}



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