struts2详解(二)---->>单个文件上传
实现原理:
Struts 2是通过Commons FileUpload文件上传。Commons FileUpload通过将HTTP的数据保存到临时文件夹，然后Struts使用fileUpload拦截器将文件绑定到Action的实例中。从而我们就能够以本地文件方式的操作浏览器上传的文件。
具体实现
先要引入必要的jar包：
1、首先，创建文件上传页面index.jsp，内容如下：
Jsp代码
- <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
- <%
- String path = request.getContextPath();
- String basePath = request.getScheme() + "://"
- + request.getServerName() + ":" + request.getServerPort()
- + path + "/";
- %>
- <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
- <html>
- <head>
- <base href="<%=basePath%>">
- <title>My JSP 'index.jsp' starting page</title>
- <meta http-equiv="pragma" content="no-cache">
- <meta http-equiv="cache-control" content="no-cache">
- <meta http-equiv="expires" content="0">
- <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
- <meta http-equiv="description" content="This is my page">
- <!--
- <link rel="stylesheet" type="text/css" href="styles.css">
- -->
- </head>
- <body>
- <div align="center">
- <!-- enctype="multipart/form-data" 这个属性是必须得有的 -->
- <form action="csdn/upload.action" method="post"
- enctype="multipart/form-data">
- <table border="1px">
- <tr>
- <td>
- 标题:
- </td>
- <td>
- <input type="text" name="title" />
- </td>
- </tr>
- <tr>
- <td>
- 文件：
- </td>
- <td>
- <input type="file" name="pic" />
- </td>
- </tr>
- <tr>
- <td colspan="2" align="center">
- <input type="submit" value="上传" />
- </td>
- </tr>
- </table>
- </form>
- </div>
- </body>
- </html>
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <div align="center"> <!-- enctype="multipart/form-data" 这个属性是必须得有的 --> <form action="csdn/upload.action" method="post" enctype="multipart/form-data"> <table border="1px"> <tr> <td> 标题: </td> <td> <input type="text" name="title" /> </td> </tr> <tr> <td> 文件： </td> <td> <input type="file" name="pic" /> </td> </tr> <tr> <td colspan="2" align="center"> <input type="submit" value="上传" /> </td> </tr> </table> </form> </div> </body> </html>
备注：
在index.jsp中，先将表单的提交方式设为POST，然后将enctype设为multipart/form-data
2、其次是UserAction.java代码
Java代码
- package cn.csdn.struts2.action;
- import java.io.File;
- import java.io.IOException;
- import org.apache.commons.io.FileUtils;
- import org.apache.struts2.ServletActionContext;
- import com.opensymphony.xwork2.ActionSupport;
- public class UserAction extends ActionSupport{
- /**
- * @author z_xiaofei168
- */
- private static final long serialVersionUID = 1L;
- /** 标题 */
- private String title;
- /** 获取文件 文件名与视图层的名称一致 */
- private File pic;
- /** 获取文件的类型 必须是： 文件名+ContentType */
- private String picContentType;
- /** 获取文件的名称 必须是： 文件名+FileName */
- private String picFileName;
- /** 保存文件路径 /保存文件的文件名称 */
- private String savePath;
- public String getTitle() {
- return title;
- }
- public void setTitle(String title) {
- this.title = title;
- }
- public File getPic() {
- return pic;
- }
- public void setPic(File pic) {
- this.pic = pic;
- }
- public String getPicContentType() {
- return picContentType;
- }
- public void setPicContentType(String picContentType) {
- this.picContentType = picContentType;
- }
- public String getPicFileName() {
- return picFileName;
- }
- public void setPicFileName(String picFileName) {
- this.picFileName = picFileName;
- }
- public String getSavePath() {
- /**获取上下的路径*/
- return ServletActionContext.getServletContext().getRealPath(savePath);
- }
- public void setSavePath(String savePath) {
- this.savePath = savePath;
- }
- /** copy读取 */
- public String uploadFile(){
- System.out.println("savePath："+savePath);
- System.out.println("pic："+pic);
- System.out.println("picContentType："+picContentType);
- System.out.println("picFileName："+picFileName);
- System.out.println("getSavePath()："+getSavePath());
- /**保存的具体路径*/
- String savepath = getSavePath();
- /**根据保存的路径创建file对象*/
- File file = new File(savepath);
- if(!file.exists()){
- /**创建此文件对象路径*/
- file.mkdirs();
- }
- try {
- /**使用的是：org.apache.commons.io.FileUtils FileUtils*/
- FileUtils.copyFile(pic, new File(file,getPicFileName()));
- } catch (IOException e) {
- e.printStackTrace();
- }
- return SUCCESS;
- }
- }
package cn.csdn.struts2.action;
import java.io.File;
import java.io.IOException;
import org.apache.commons.io.FileUtils;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UserAction extends ActionSupport{
/**
* @author z_xiaofei168
*/
private static final long serialVersionUID = 1L;
/** 标题 */
private String title;
/** 获取文件 文件名与视图层的名称一致 */
private File pic;
/** 获取文件的类型 必须是： 文件名+ContentType */
private String picContentType;
/** 获取文件的名称 必须是： 文件名+FileName */
private String picFileName;
/** 保存文件路径 /保存文件的文件名称 */
private String savePath;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public File getPic() {
return pic;
}
public void setPic(File pic) {
this.pic = pic;
}
public String getPicContentType() {
return picContentType;
}
public void setPicContentType(String picContentType) {
this.picContentType = picContentType;
}
public String getPicFileName() {
return picFileName;
}
public void setPicFileName(String picFileName) {
this.picFileName = picFileName;
}
public String getSavePath() {
/**获取上下的路径*/
return ServletActionContext.getServletContext().getRealPath(savePath);
}
public void setSavePath(String savePath) {
this.savePath = savePath;
}
/** copy读取 */
public String uploadFile(){
System.out.println("savePath："+savePath);
System.out.println("pic："+pic);
System.out.println("picContentType："+picContentType);
System.out.println("picFileName："+picFileName);
System.out.println("getSavePath()："+getSavePath());
/**保存的具体路径*/
String savepath = getSavePath();
/**根据保存的路径创建file对象*/
File file = new File(savepath);
if(!file.exists()){
/**创建此文件对象路径*/
file.mkdirs();
}
try {
/**使用的是：org.apache.commons.io.FileUtils FileUtils*/
FileUtils.copyFile(pic, new File(file,getPicFileName()));
} catch (IOException e) {
e.printStackTrace();
}
return SUCCESS;
}
}
3、配置文件： struts.xml
Xml代码
- <?xml version="1.0" encoding="UTF-8"?>
- <!DOCTYPE struts PUBLIC
- "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
- "http://struts.apache.org/dtds/struts-2.1.7.dtd">
- <struts>
- <package name="csdn" extends="struts-default" namespace="/csdn">
- <global-results>
- <result name="input">/index.jsp</result>
- </global-results>
- <action name="upload" class="cn.csdn.struts2.action.UserAction" method="uploadFile">
- <!-- 文件保存的文件名称 -->
- <param name="savePath">/uploads</param>
- <result name="success">/sc.jsp</result>
- </action>
- </package>
- </struts>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
"http://struts.apache.org/dtds/struts-2.1.7.dtd">
<struts>
<package name="csdn" extends="struts-default" namespace="/csdn">
<global-results>
<result name="input">/index.jsp</result>
</global-results>
<action name="upload" class="cn.csdn.struts2.action.UserAction" method="uploadFile">
<!-- 文件保存的文件名称 -->
<param name="savePath">/uploads</param>
<result name="success">/sc.jsp</result>
</action>
</package>
</struts>
4、下面我们就来看看上传成功的页面：
