一、单文件上传
1.action中的代码
package action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;
import org.apache.struts2.ServletActionContext;
public class UpAction1 extends BaseAction{
private File upload;//表单name属性
private String uploadContentType;//该名字是在upload基础上扩展的
private String uploadFileName;//文件名
public String execute() throws Exception{
// 获得上传路径
String filename = ServletActionContext.getServletContext().getRealPath(
"/uploads")+ "//" + uploadFileName;
// 流操作
InputStream is=new FileInputStream(getUpload());
OutputStream os=new FileOutputStream(filename);
byte[] b=new byte[1024000];
int len=0;
while((len=is.read(b))>0){
os.write(b, 0, len);
}
os.close();
is.close();
return SUCCESS;
}
//---
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;
}
}
2.jsp页面的代码
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
</head>
<body>
<form action="upAction1" method="post" enctype="multipart/form-data">
选择文件<input type="file" name="upload"/>
<input type="submit" value="上传"/>
</form>
</body>
</html>
注意：表单中一定要有 enctype="multipart/form-data"！！！
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
</head>
<body>
<h3>上传成功</h3>
<img src="uploads/${uploadFileName }">
</body>
</html>
3.xml中的配置代码
<action name="upAction1" class="action.UpAction1">
<result name="success">/up1ok.jsp</result>
<result name="input">/up1.jsp</result>
<interceptor-ref name="fileUpload">
<param name="allowedExtensions">.jpg,.png,.gif</param>
<param name="maximumSize">1024000</param>
</interceptor-ref>
<interceptor-ref name="defaultStack"/>
</action>注意：<interceptor-ref name="defaultStack"/>一定要配置
二、多文件上传
其实和单文件上传一样的思路，就是利用循环读取列表内容就行。
1.action中的代码
package action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Date;
import org.apache.struts2.ServletActionContext;
public class UpAction2 extends BaseAction {
private File[] upload;// 表单name属性
private String[] uploadContentType;// 该名字是在upload基础上扩展的
private String[] uploadFileName;// 文件名
public String execute() throws Exception {
File[] files = this.getUpload();
for (int i = 0; i < files.length; i++) {
OutputStream os = new FileOutputStream(ServletActionContext
.getServletContext().getRealPath("/uploads")
+ "\\" + this.getUploadFileName()[i]);
byte[] buffer = new byte[1024000];
InputStream is = new FileInputStream(files[i]);
int len = 0;
while ((len = is.read(buffer)) > 0) {
os.write(buffer, 0, len);
}
os.close();
is.close();
}
return SUCCESS;
}
// ---
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;
}
}
2.jsp页面的代码
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
</head>
<body>
<form action="upAction2" method="post" enctype="multipart/form-data">
选择文件1:<input type="file" name="upload"/><p/>
选择文件2:<input type="file" name="upload"/><p/>
选择文件3:<input type="file" name="upload"/><p/>
<input type="submit" value="上传"/>
</form>
</body>
</html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
</head>
<body>
<h3>上传成功</h3>
<img src="uploads/${uploadFileName[0]}">
<img src="uploads/${uploadFileName[1]}">
<img src="uploads/${uploadFileName[2]}">
</body>
</html>
3.xml中的配置代码
<action name="upAction2" class="action.UpAction2">
<result name="success">/up2ok.jsp</result>
<result name="input">/up2.jsp</result>
<interceptor-ref name="fileUpload">
<param name="allowedExtensions">.jpg,.png,.gif</param>
<param name="maximumSize">1024000</param>
</interceptor-ref>
<interceptor-ref name="defaultStack"/>
</action>