Interceptor

與filter的區別：先過filter再過interceptor

怎麼設定攔截器： 在配置檔案struts-sy.xml的 package裡面配置

<!--  配置2個攔截器  class指的是攔截器的全類名 -->
<interceptors>
			<interceptor name="oneInterceptor" class="com.zking.five.interceptor.OneInterceptor"></interceptor>
			<interceptor name="twoInterceptor" class="com.zking.five.interceptor.TwoInterceptor"></interceptor>
		</interceptors>
	<action name="interceptorAction" class="com.zking.five.web.InterceptorAction" >
			<interceptor-ref name="oneInterceptor"></interceptor-ref>
			<interceptor-ref name="twoInterceptor"></interceptor-ref>
		</action>
<action name="interceptorAction" class="com.zking.five.web.InterceptorAction" >
			<interceptor-ref name="oneInterceptor"></interceptor-ref>
			<interceptor-ref name="twoInterceptor"></interceptor-ref>
		</action>



 

檔案上傳：

檔案上傳的三種方案：

1. 將上傳的檔案以二進位制形式存放到資料庫 OA系統 activity工作流程
2. 將檔案上傳到檔案伺服器（硬碟足夠大）中
3. 將檔案上傳到tomcat所在的web伺服器中

真實路徑與虛擬路徑的概念：

1. 所謂的真實路徑指的是在自己的電腦上能夠看到的路徑
2. 所謂的虛擬路徑，在自己的電腦上看不到的，路徑在別人的電腦上能夠看到

UploadAction ：

package com.zking.five.web;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

import org.apache.commons.io.FileUtils;

import com.zking.four.web.BeanAction;
public class UploadAction extends BeanAction {

	private File file;//變數名指的是jsp的name屬性，就是你要上傳的檔案
	private String fileContentType;//xxxContentType
	private String fileFileName;//xxxFileName
	
	private String serverDiv = "/upload";//資料夾
	
	//上傳
	public String upload() {
		System.out.println(fileContentType);
		System.out.println(fileFileName);		
		String realPath = getRealPath(serverDiv + "/"+fileFileName);
		System.out.println(realPath);
		/*
		 * 引數1：本地圖片檔案
		 * 引數2：在伺服器生成的檔案
		 */
		try {
			FileUtils.copyFile(file, new File(realPath));
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return SUCCESS;		
	}
	/**
	 * 指的是Linux下的檔案的所在位置
	 * @param path
	 * @return
	 */
	private String getRealPath(String path) {
		// TODO Auto-generated method stub
		return application.getRealPath(path);
	}

	
	//檢視圖片
	public String openAs() {
		
		String type = "image/jpeg";
		String name = "u=2988065565,1735810570&fm=27&gp=0.jpg";
		response.setContentType(type);//內容型別
		 response.setHeader("Content-Disposition","filename=" + name);//檔名
		/*
		 * 將遠端的圖片輸出到本地
		 * 資料來源inputstream:遠端 new file(realPath)
		 * 目的：輸出到本地jsp response.getOutputStream()
		 */		
		String realPath = getRealPath(serverDiv + "/"+name);
		try {
			FileUtils.copyFile(new File(realPath), response.getOutputStream());
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		return null;		
	}
	

	
	//下載圖片
	public String download() {
		
		String type = "image/jpeg";
		String name = "u=2988065565,1735810570&fm=27&gp=0.jpg";
		response.setContentType(type);
		 response.setHeader("Content-Disposition","attachment;filename=" + name);//檔名
		/*
		 * 將遠端的圖片輸出到本地
		 * 資料來源inputstream:遠端 new file(realPath)
		 * 目的：輸出到本地jsp response.getOutputStream()
		 */
		
		String realPath = getRealPath(serverDiv + "/"+name);
		try {
//			FileUtils.copyFile(new File(realPath), response.getOutputStream());
			BufferedInputStream in = new BufferedInputStream(new FileInputStream(file));
			BufferedOutputStream out = new BufferedOutputStream(response.getOutputStream());
			copyStream(in, out);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
		return null;		
	}
	
	private void copyStream(BufferedInputStream in,BufferedOutputStream out) throws IOException {
		
		byte[] bbuf = new byte[1024];
		int len = 0;
		while((len = in.read(bbuf)) !=-1 ) {
			out.write(bbuf,0,len);
		}
		in.close();
		out.close();
		
	}
	

	public File getFile() {
		return file;
	}

	public void setFile(File file) {
		this.file = file;
	}

	public String getFileContentType() {
		return fileContentType;
	}

	public void setFileContentType(String fileContentType) {
		this.fileContentType = fileContentType;
	}

	public String getFileFileName() {
		return fileFileName;
	}

	public void setFileFileName(String fileFileName) {
		this.fileFileName = fileFileName;
	}
	
	
	
	
}

 

配置：

<action name="uploadAction_*" class="com.zking.five.web.UploadAction" method="{1}" >			
			<result name="success" >/success.jsp</result>
		</action>

jsp頁面demp1 ：

<h1>Struts上傳下載</h1> 
<s:form namespace="/sy" action="uploadAction_upload"  enctype="multipart/form-data" method="post" >
	<input type="file" name="file" > 
	<input type="submit" value="上傳" >
</s:form>
 

jsp頁面success ：

<h1>直接開啟圖片</h1> 
<s:url var="openAsurl" namespace="/sy" action="uploadAction_openAs.action" ></s:url>
<s:property value="openAsurl" />
<img alt="" src='<s:property value="openAsurl" />'>

<h1>過載圖片</h1>
<s:url var="downloadAsurl" namespace="/sy" action="uploadAction_download.action" ></s:url>
<s:a href="%{#downloadAsurl}" >下載</s:a>