第一步：首先写个上传文件的页面（简单的一个form表单）
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>文件上传</title>
</head>
<body>
<h1>文件上传</h1>
<br><br>
<form action="/Struts2-day02pm/upload/one_upload.action" method="post" enctype="multipart/form-data">
文件上传1：<br><br>
<input type="file" name="oneFile"><br><br>
<input type="submit" value="开始上传">
</form>
</body>
第二步：创建一个基类BaseAction.java,继承ActionSupport，并实现ServletRequestAware,ServletResponseAware,ServletContextAware三个接口，重写三个接口的set方法
public class BaseAction extends ActionSupport implements ServletRequestAware,ServletResponseAware,ServletContextAware{
/**
* 编写一个基类，继承ActionSupport并实现相应的接口
* 以后的Action直接继承该类，就可以简单获取到Servlet API
* 这是一个典型的适配设计模式
* @author Owen
*/
private static final long serialVersionUID = 7267018575222346353L;
@Override
public void setServletContext(ServletContext servletContext) {
}
@Override
public void setServletResponse(HttpServletResponse response) {
}
@Override
public void setServletRequest(HttpServletRequest request) {
}
}
第三步：创建OneUploadAction请求处理类，继承BaseAction
public class OneUploadAction extends BaseAction {
private static final long serialVersionUID = -4445894434193884175L;
// 该属性名必须和<input type="file" name="oneFile">中name值一致
private File oneFile;
// 真实名称
private String oneFileFileName;
// 文件类型
private String oneFileContentType;
private HttpServletRequest request;
@Override
public void setServletRequest(HttpServletRequest request) {
this.request = request;
}
@Override
public String execute() throws Exception {
// 获取保存上传文件在服务器的真是路径
String uploadPath = request.getServletContext().getRealPath("upload");
System.out.println(uploadPath);//目录真是路径
System.out.println("oneFile--"+oneFile.getName());//文件临时名称
System.out.println("oneFileFileName--"+oneFileFileName);//文件原始名称
System.out.println("oneFileContentType--"+oneFileContentType);//文件类型
// 第一种：该步骤适合上传小文件
// 将临时文件复制到硬盘上的真是路径
/*
File file = new File(uploadPath, oneFileFileName);//拼接文件的存放路径和存放文件的真实名称
FileUtils.copyFile(oneFile, file);//将临时文件复制到上面这个路径
*/
// 第二种：适合大文件上传操作
/*InputStream is = null;
OutputStream os = null;
is = new FileInputStream(oneFile);
os = new FileOutputStream(new File(uploadPath,oneFileFileName));
byte[] buffer = new byte[500];
int length = 0;
while((length=is.read(buffer,0,buffer.length)) != -1){
os.write(buffer, 0,length);
}
os.close();
is.close();*/
copyFile(uploadPath);
return SUCCESS;
}
public void copyFile(String uploadPath){
InputStream is = null;
OutputStream os = null;
try {
is = new FileInputStream(oneFile);
os = new FileOutputStream(new File(uploadPath,oneFileFileName));
byte[] buffer = new byte[500];
int len = 0;
while((len=is.read(buffer,0,buffer.length)) != -1){
os.write(buffer, 0,len);
}
os.close();
is.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public File getOneFile() {
return oneFile;
}
public void setOneFile(File oneFile) {
this.oneFile = oneFile;
}
public String getOneFileFileName() {
return oneFileFileName;
}
public void setOneFileFileName(String oneFileFileName) {
this.oneFileFileName = oneFileFileName;
}
public String getOneFileContentType() {
return oneFileContentType;
}
public void setOneFileContentType(String oneFileContentType) {
this.oneFileContentType = oneFileContentType;
}
}
第三步：配置struts.xml文件
<struts>
<package name="upload-default" namespace="/upload" extends="struts-default">
<action name="one_upload" class="com.struts2.day02pm.action.OneUploadAction">
<result>/WEB-INF/jsp/one_upload_ok.jsp</result>
</action>
</package>
</struts>
第四步：浏览器测试
时间： 2024-10-11 06:36:41