Struts2提供了文件上传的框架，Struts2默认的文件上传框架是cos,大家也可以根据自己的需要修改Struts2中的文件上传框架，对于文件上传来说，无论使用Struts2中的哪一种框架，上传方式都是比较简单的。下面用一个案例介绍Struts2的文件上传。
该案例比较简单，允许用户进行文件上传,上传成功提示文件上传的主题，上传失败则提示上传失败的提示,当然为了防止恶意上传，我专门做了一个简单的文件过滤，限制文件的格式
首先看页面的操作
上传成功的情况
上传失败的情况
接下来分析源码
uploadFile.jsp页面
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>文件上传</title>
</head>
<body>
<s:form action="upload" enctype="multipart/form-data">
<s:textfield name="title">文件标题</s:textfield>
<s:file name="upload" label="选择文件"></s:file>
<s:submit value="上传"></s:submit>
</s:form>
</body>
</html>
上传文件对应的Action
package test.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 fileUploadAction extends ActionSupport {
private String title;
private File upload;
private String uploadContentType;
private String uploadFileName;
private String savePath;
// 设置文件格式
private String allowType;
public String getAllowType() {
return allowType;
}
public void setAllowType(String allowType) {
this.allowType = allowType;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public File getUpload() {
return upload;
}
public void setUpload(File upload) {
this.upload = upload;
}
public String getUploadContentType() {
return uploadContentType;
}
public void setUploadContentType(String uploadContentType) {
this.uploadContentType = uploadContentType;
}
public String getUploadFileName() {
return uploadFileName;
}
public void setUploadFileName(String uploadFileName) {
this.uploadFileName = uploadFileName;
}
public String getSavePath() {
return ServletActionContext.getServletContext().getRealPath(savePath);
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
@Override
public String execute() throws Exception {
// 获取文件内容
FileInputStream fin = new FileInputStream(getUpload());
// 定义一个byte数组
byte[] buffer = new byte[1024];
// 建立文件输出流,建立文件位置
FileOutputStream fout = new FileOutputStream(getSavePath() + "\\" + getUploadFileName());
// 每读完1M的量就往文件里写
int len = 0;
while ((len = fin.read(buffer)) > 0) {
fout.write(buffer, 0, len);
}
System.out.println("fileUploadAction [title=" + title + ", upload=" + upload + ", uploadContentType="
+ uploadContentType + ", uploadFileName=" + uploadFileName + ", savePath=" + savePath + "]");
return SUCCESS;
}
public String filterFileType(String[] types) {
// 获取文件的格式
String fileType = this.getUploadContentType();
System.out.println(fileType);
if (fileType != null) {
for (String Type : types) {
if (Type.equals(fileType)) {
return null;
} else
return ERROR;
}
}
return ERROR;
}
@Override
public void validate() {
//接收验证结果
String Result=this.filterFileType(getAllowType().split(","));
if(Result!=null)
{
addFieldError("uploadError", "该文件格式 不正确");
}
}
}
Struts.xml代码
<?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>
<constant name="struts.enable.DynamicMethodInvocation" value="true" />
<constant name="struts.devMode" value="true" />
<package name="upload" extends="struts-default">
<action name="upload" class="test.Action.fileUploadAction">
<param name="savePath">/WEB-INF/uploadFiles</param>
<param name="allowType">image/x-png,</param>
<result>/success.jsp</result>
<result name="input">/uploadError.jsp</result>
</action>
</package>
</struts>
分别对应的成功和失败两个jsp 视图
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>结果</title>
</head>
<body>
上传成功
文件标题:<s:property value="title" /><br>
文件为:<s:property value="upload"/>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>更新失败</title>
</head>
<body>
<s:fielderror name="uploadError"></s:fielderror>
</body>
</html>
时间： 2024-08-06 20:00:20