struts 的攔截器和檔案下載
攔截器:
Interceptor
implements Interceptor (com.opensymphony.xwork2.interceptor.Interceptor)
extends AbstractInterceptor (com.opensymphony.xwork2.interceptor.AbstractInterceptor)
與filter的區別：先過filter再過interceptor
檔案上傳攔截器
org.apache.struts2.interceptor.FileUploadInterceptor
檔案上傳：
三種上傳方案
虛擬路徑與真實路徑 /upload
copyFile與copydirectory
0. 檔案下載
另存為
直接開啟
1. 內容型別
response.setContentType(d.getMime());
2. 設定響應頭
response.setHeader("Content-Disposition","attachment;filename=" + fileName);//檔名
3. 處理檔名的中文亂碼
String fileName = d.getFileName();
fileName = new String(fileName.getBytes("utf-8"), "iso8859-1");
4. struts2檔案上傳大小設定
<!-- 指定允許上傳的檔案最大位元組數。預設值是2097152(2M) 10M=10*1024*1024 -->
<constant name="struts.multipart.maxSize" value="10485760"/>
5. struts2檔案上傳型別設定
根據struts2自帶的fileupload攔截器中提供的allowedTypes來進行限制
<interceptor-ref name="fileUpload">
<param name="allowedTypes">image/png,image/gif,image/jpeg</param>
</interceptor-ref>
6. 其它
enctype="multipart/form-data" method="post"
private File file;
private String fileContentType;
private String fileFileName;
package com.zking.five.interceptor;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import org.apache.commons.io.FileUtils;
import org.apache.coyote.http11.filters.BufferedInputFilter;
import com.zking.four.web.BaseAction;
/**
* 檔案上傳的三種方案：
* 1.將上傳的檔案以二進位制的形式存放到資料庫 oa系統 activiti工作流程
* @author Machenike
*
* 2.將檔案上傳到檔案伺服器(硬碟足夠大)中
*
* 3.將檔案傳送到tomcat所在的普通web伺服器
*
*
* 真實路徑與虛擬路徑的概念
* 1，所謂真實路徑指的是在自己電腦上能夠找到的路徑
* 2，所謂虛擬，在自己的電腦上看不到，在別人電腦（tomcat所在位置伺服器）上能夠看到
*
*
*/
public class UploadAction extends BaseAction{
private File file;//變數名指的是jsp中檔案選擇器的name屬性， 就是你要上傳的檔案 xxx
private String fileContentType;//xxxContentType; 檔案型別
private String fileFileName;//xxxFileName 檔名稱
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;
}
private String serverDir = "/upload";
/**
* 下載檔案的方法
* @return
*/
public String upload() {
String realPath = serverDir + "/" +fileFileName;
/*
* 引數1：本地要下載的圖片檔案
*
* 引數2： 在伺服器生成的檔案
*/
System.out.println(fileFileName);
System.out.println(fileContentType);
// System.out.println(application.getRealPath(realPath));
// System.out.println(getRealPath(realPath));
try {
FileUtils.copyFile(file, new File(getRealPath(realPath)));
// File file2 = new File(getRealPath(realPath));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return SUCCESS;
}
/**
* 設定緩衝流的檢視圖片 優化
* @param bos
* @param bis
*/
public void CopyFile(BufferedOutputStream bos,BufferedInputStream bis) {
byte[] b = new byte[1024];
int len = 0;
try {
while((len=bis.read(b))!=-1) {
bos.write(b,0,len);
}
bis.close();
bos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 獲取Linux下的上傳檔案的所在位置
* @param path
* @return
*/
private String getRealPath(String path) {
// TODO Auto-generated method stub
System.out.println("path:"+path);
return application.getRealPath(path);
}
/**
* 在本地檢視tomcat伺服器上的圖片
* @return
*/
public String openAs() {
String name = "1.jpg";
String type = "image/jpg";
String realPath = serverDir + "/" +name;
response.setContentType(type);
response.setHeader("Content-Disposition","filename=" + name);//檔名
try {
// FileUtils.copyFile(new File(getRealPath(realPath)), response.getOutputStream());
FileInputStream fileInputStream = new FileInputStream(new File(getRealPath(realPath)));
CopyFile(new BufferedOutputStream(response.getOutputStream()),new BufferedInputStream(fileInputStream));
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
/**
* 下載檔案
* @return
*/
public String download() {
String name = "1.jpg";
String type = "image/jpg";
String realPath = serverDir + "/" +name;
response.setContentType(type);
response.setHeader("Content-Disposition","attachment;filename=" + name);//檔名
try {
FileUtils.copyFile(new File(getRealPath(realPath)), response.getOutputStream());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}