Struts2文件上传框架
1、概述
2、文件上传
singleUpload.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!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>Insert title here</title> </head> <body> <form action="upload/doUpload" method="post" enctype="multipart/form-data"> <input type="file" name="upload"> <input type="submit" value="上传"> </form> </body> </html>
struts.xml
<package name="upload" namespace="/upload" extends="struts-default"> <action name="doUpload" class="com.ljb.web.upload.UploadAction" method="doUpload"> <result>/singleSuccess.jsp</result> </action> </package>
UploadAction:
package com.ljb.web.upload;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.commons.io.IOUtils;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport {
private File upload;
private String uploadContentType;
private String uploadFileName;
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 doUpload () throws IOException {
System.out.println(upload);
System.out.println(uploadContentType);
System.out.println(uploadFileName);
// 获取保存文件路径
String savePath = ServletActionContext.getServletContext().getRealPath("/upload/" + this.uploadFileName);
System.out.println(savePath);
FileInputStream fis = new FileInputStream(upload);
FileOutputStream fos = new FileOutputStream(savePath);
IOUtils.copy(fis, fos);
fos.flush();
fos.close();
fis.close();
return SUCCESS;
}
}
singleSuccess.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib uri="/struts-tags" prefix="s" %> <% String contextPath = request.getContextPath()+"/"; %> <!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>Insert title here</title> </head> <body> 文件上传成功! <img alt="" src="<%=contextPath %>upload/<s:property value='uploadFileName'/>" /> </body> </html>
小结：
3、限制文件上传大小
第一种方式：（在struts中配置常量限制文件上传大小，默认2M）
<constant name="struts.multipart.maxSize" value="10000000"></constant>
第二种方式：设置拦截器参数
4、上传多个文件
样例：
multieFileUpload.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>Insert title here</title>
<script type="text/javascript">
function addFile () {
var btn = document.getElementById("btn");
var newChild = document.createElement("input");
newChild.setAttribute("type", "file");
newChild.setAttribute("name", "upload");
btn.parentNode.appendChild(newChild);
btn.parentNode.appendChild(document.createElement("br"));
}
</script>
</head>
<body>
<form action="upload/multiFile" method="post" enctype="multipart/form-data">
<input type="file" name="upload">
<input type="button" value="继续添加" id="btn" onclick="addFile();">
<input type="submit" value="上传"><br>
</form>
</body>
</html>
struts.xml
<package name="upload" namespace="/upload" extends="struts-default"> <action name="doUpload" class="com.ljb.web.upload.UploadAction" method="doUpload"> <result>/singleSuccess.jsp</result> <result name="input">/error.jsp</result> </action> <action name="multiFile" class="com.ljb.web.upload.MutipleFileUploadUsingListAction" method="doUpload"> <result>/multiSuccess.jsp</result> </action> </package>
mutipleFileUploadUsingListAction
package com.ljb.web.upload;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import org.apache.commons.io.IOUtils;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class MutipleFileUploadUsingListAction extends ActionSupport {
private List<File> upload;
private List<String> uploadContentType;
private List<String> uploadFileName;
public String doUpload () throws IOException {
System.out.println(upload.get(0));
for (int i = 0 ; i < upload.size() ; i++) {
String savePath = ServletActionContext.getServletContext().getRealPath("/upload/" + this.uploadFileName.get(i));
FileInputStream fis = new FileInputStream(upload.get(i));
FileOutputStream fos = new FileOutputStream(savePath);
IOUtils.copy(fis, fos);
fos.flush();
fos.close();
fis.close();
}
return SUCCESS;
}
public List<File> getUpload() {
return upload;
}
public void setUpload(List<File> upload) {
this.upload = upload;
}
public List<String> getUploadContentType() {
return uploadContentType;
}
public void setUploadContentType(List<String> uploadContentType) {
this.uploadContentType = uploadContentType;
}
public List<String> getUploadFileName() {
return uploadFileName;
}
public void setUploadFileName(List<String> uploadFileName) {
this.uploadFileName = uploadFileName;
}
}
