第一種解決方案：
1.手動實現文件過濾：
判斷上傳的文件是否在允許的範圍內
定義該Action允許上傳的文件類型 private String allowTypes;
利用Struts2的輸入效驗判斷用戶的輸入的文件是否合理
UploadAction.java
package action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport {
/**
*
*/
private static final long serialVersionUID = 1L;
private String title;
private File uploadfile;
private String uploadfileContentType;
private String uploadfileFileName;
private String savePath;
private String allowType;//定義該Action允許上傳的文件類型
public boolean check(String type){
String[] types=allowType.split(",");
for(String s:types){
if(s.equals(type)){
return true;
}
}
return false;
}
public void validate(){
boolean b=check(uploadfileContentType);
if(!b){
addFieldError("upload","上傳文件錯誤");
}
}
public String getAllowType() {
return allowType;
}
public void setAllowType(String allowType) {
this.allowType = allowType;
}
public String upload() throws Exception {
FileInputStream fis = new FileInputStream(getUploadfile());
FileOutputStream fos=new FileOutputStream(getSavePath()+"\\"+getUploadfileFileName());
byte[] buffer=new byte[1024];
int len=0;
while((len=fis.read(buffer))>0){
fos.write(buffer,0,len);
}
fos.close();
fis.close();
return SUCCESS;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public File getUploadfile() {
return uploadfile;
}
public void setUploadfile(File uploadfile) {
this.uploadfile = uploadfile;
}
public String getUploadfileContentType() {
return uploadfileContentType;
}
public void setUploadfileContentType(String uploadfileContentType) {
this.uploadfileContentType = uploadfileContentType;
}
public String getUploadfileFileName() {
return uploadfileFileName;
}
public void setUploadfileFileName(String uploadfileFileName) {
this.uploadfileFileName = uploadfileFileName;
}
public String getSavePath() {
return ServletActionContext.getServletContext().getRealPath(savePath);//得到絕對路徑
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
}
struts.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<package name="hello" namespace="/hello" extends="struts-default">
<action name="login" class="action.UploadAction" method="upload">
<!-- 設置允許上傳的文件類型 -->
<param name="allowType">image/x-png,file/txt,image/jpeg</param>
<param name="savePath">/uploadFiles</param>
<result name="success">
/success.jsp
</result>
<result name="input">
/index.jsp
</result>
</action>
</package>
</struts>
index.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<s:fielderror/>
<form action="/Upload-1/hello/login" method="post" enctype="multipart/form-data">
文件名：<input type="text" name="title"/>
文件：<input type="file" name="uploadfile"/>
<input type="submit"/>
</form>
</body>
</html>
success.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="s" uri="/struts-tags"%>
</head>
<%
String path = request.getContextPath();
System.out.println(path);
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
System.out.println(basePath);
%>
<body>
上傳成功！<br>
文件標題：<s:property value="title"/><br>
文件爲:<img src="<%=basePath%><s:property value="'uploadFiles/'+uploadfileFileName"/>"/><br>
</body>
</html>
第二種解決方案：
2.攔截器實現文件過濾：
配置fileUpload攔截器兩個參數：
allowedTypes:允許上傳文件的類型，多個值用,分開
maximumSize:允許上傳文件的大小，單位字節。
UploadAction.java
package action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport {
/**
*
*/
private static final long serialVersionUID = 1L;
private String title;
private File uploadfile;
private String uploadfileContentType;
private String uploadfileFileName;
private String savePath;
private String allowedTypes;
public String getAllowedTypes() {
return allowedTypes;
}
public void setAllowedTypes(String allowedTypes) {
this.allowedTypes = allowedTypes;
}
public String upload() throws Exception {
FileInputStream fis = new FileInputStream(getUploadfile());
FileOutputStream fos=new FileOutputStream(getSavePath()+"\\"+getUploadfileFileName());
byte[] buffer=new byte[1024];
int len=0;
while((len=fis.read(buffer))>0){
fos.write(buffer,0,len);
}
fos.close();
fis.close();
return SUCCESS;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public File getUploadfile() {
return uploadfile;
}
public void setUploadfile(File uploadfile) {
this.uploadfile = uploadfile;
}
public String getUploadfileContentType() {
return uploadfileContentType;
}
public void setUploadfileContentType(String uploadfileContentType) {
this.uploadfileContentType = uploadfileContentType;
}
public String getUploadfileFileName() {
return uploadfileFileName;
}
public void setUploadfileFileName(String uploadfileFileName) {
this.uploadfileFileName = uploadfileFileName;
}
public String getSavePath() {
return ServletActionContext.getServletContext().getRealPath(savePath);//得到絕對路徑
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
}
struts.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<package name="hello" namespace="/hello" extends="struts-default">
<action name="login" class="action.UploadAction" method="upload">
<interceptor-ref name="fileUpload">
<param name="allowedTypes">image/x-png,image/gif,image/jpeg</param>
<param name="maximumSize">20000000</param>
</interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
<param name="savePath">/uploadFiles</param>
<result name="success">
/success.jsp
</result>
<result name="input">
/index.jsp
</result>
</action>
</package>
</struts>