Struts2（四）文件上传

来源：互联网发布：电信网络机顶盒密码编辑：程序博客网时间：2024/05/16 04:55

具体步骤：
1、在WEB-INF/lib下加入commons-fileupload-1.2.1.jar、commons-io-1.3.2.jar
(在struts2.0版本已集成commons-fileupload,在struts2.1后被省去，得导入)
2、将form表的enctype设置为："multipart/form-data",如下:
<form enctype="multipart/form-data" action="${pageContext.request.contextPath}/xxx.action" method="post">
<input type="file" name="uploadImage">
</form>
3、在action类中添加以下属性,属性红色加粗部分对应于表单中文件字段的名称:
public class HelloWorldAction{
private File uploadImage;//得到上传的文件
private String uploadImageContentType;//得到文件的类型
private String uploadImageFileName;//得到文件的名称
/***属性的setter和getter方法***/
public String upload() throws Exception{
String realpath=ServletActionContext.getServletContext().getRealPath("/images");
File file=new File(realpath);
if(!file.exists())
file.mkdirs();
FileUtil.copyFile(uploadImage,new File(file,uploadImageFileName));
return "success";
}
}

完整代码：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>My JSP 'fileUpload.jsp' starting page</title></head><body><formaction="${pageContext.request.contextPath}/control/list_execute.action"enctype="multipart/form-data" method="post">文件:<input type="file" name="uploadfile"> <input type="submit"value="上传" /></form></body></html>

package struts2.example.action;import java.io.File;import java.io.IOException;import java.util.Arrays;import javax.servlet.ServletContext;import javax.servlet.http.HttpServletRequest;import org.apache.commons.io.FileUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionContext;public class HelloWorldAction {private File uploadfile;private String uploadfileFileName;// 上传文件的文件名称public File getUploadfile() {return uploadfile;}public void setUploadfile(File uploadfile) {this.uploadfile = uploadfile;}public String getUploadfileFileName() {return uploadfileFileName;}public void setUploadfileFileName(String uploadfileFileName) {this.uploadfileFileName = uploadfileFileName;}public String execute() {// 得到站点下files文件夹的绝对路径String realpath = ServletActionContext.getServletContext().getRealPath("/files");System.out.print(realpath);if (uploadfile != null) {/* * 参数1：文件保存的目录 参数2：文件保存的文件名 */File saveFile = new File(new File(realpath), uploadfileFileName);// 用saveFile.getParentFile()得到目录，如果目录不存在，则创建该目录if (!saveFile.getParentFile().exists())saveFile.getParentFile().mkdirs();// 对文件进行保存try {FileUtils.copyFile(uploadfile, saveFile);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}ActionContext.getContext().put("upload_success", "文件上传成功!");}return "success";}}

<pre name="code" class="html"><?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC         "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"         "http://struts.apache.org/dtds/struts-2.0.dtd"><struts><constant name="struts.multipart.maxSize" value="10701096" /><package name="csdn" namespace="/control" extends="struts-default"><action name="list_*" class="struts2.example.action.HelloWorldAction"method="{1}"><!-- 定义处理结果与视图资源之间的关系 --><result name="success">/WEB-INF/page/showInfo.jsp</result></action></package></struts>

由于struts2本身上传文件大小的限制，如果上传的文件大小大于限制的值，会出现bug,可通过在struts.xml设置常量可改变上传文件限制的大小

如果上传的文件过大，如上百兆，应通过应用软件上传，通过web上传不稳定。

如果要同时上传多个文件，做几处修改即可。要注意客户端上传文件字段要相同，将action里的文件属性设为数组。

看下修改后的代码：

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>My JSP 'fileUpload.jsp' starting page</title></head><body><formaction="${pageContext.request.contextPath}/control/list_execute.action"enctype="multipart/form-data" method="post">文件1:<input type="file" name="uploadfile"><br>文件2:<input type="file" name="uploadfile"><br> 文件3:<input type="file" name="uploadfile"><br>  文件4:<input type="file" name="uploadfile"><br> <input type="submit" value="上传" /></form></body></html>

package struts2.example.action;import java.io.File;import java.io.IOException;import java.util.Arrays;import javax.servlet.ServletContext;import javax.servlet.http.HttpServletRequest;import org.apache.commons.io.FileUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionContext;public class HelloWorldAction {private File[] uploadfile;private String[] uploadfileFileName;// 上传文件的文件名称public File[] getUploadfile() {return uploadfile;}public void setUploadfile(File[] uploadfile) {this.uploadfile = uploadfile;}public String[] getUploadfileFileName() {return uploadfileFileName;}public void setUploadfileFileName(String[] uploadfileFileName) {this.uploadfileFileName = uploadfileFileName;}public String execute() {// 得到站点下files文件夹的绝对路径String realpath = ServletActionContext.getServletContext().getRealPath("/files");System.out.print(realpath);//判断不为空的时候就可以进行迭代if (uploadfile != null){File savedir=new File(realpath);if (!savedir.exists())savedir.mkdirs();for(int i=0;i<uploadfileFileName.length;i++){/* * 参数1：文件保存的目录 参数2：文件保存的文件名 */File saveFile = new File(savedir, uploadfileFileName[i]);// 用saveFile.getParentFile()得到目录，如果目录不存在，则创建该目录if (!saveFile.getParentFile().exists())saveFile.getParentFile().mkdirs();// 对文件进行保存try {FileUtils.copyFile(uploadfile[i], saveFile);} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}ActionContext.getContext().put("upload_success", "文件上传成功!");}}return "success";}}

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