struts2上传文件

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基于Struts2的文件上传

博客分类：

Struts 2

Struts框架OSApacheJSP

Struts2本身并没提供上传的组件，我们可以通过调用上传框架来实现文件的上传。

一、配置上传解析器

首先要配置项目的框架，也就是倒导入"struts2-core-2.2.1.jar"库文件，找到org.apache.struts2包下的default.porperties资源文件。如下图；资源文件中给出了不同的strus2的默认配置，我们可看到struts2默认是jakarta作为其文件上传的解析器。

jakarta是Commo-FileUpload的框架。如果要使用Commo-FileUpload框架来上传文件，只需将"commons-fileupload-1.2.1.jar"和"commons-io-1.3.2.jar"两个jar复制到项目中的WEB-INF/lib目录下就可。

如果想要使用COS框架来上传文件，只需将“cos.jar”复制到项目中就可以，然后在修改struts.multipart.parser常量值。

修改常量值有两种方法，一是在"struts.xml"中修改，代码如下：

二是在struts.properties中修改,代码如下：

sruts.multipart.parser=cos

二、实现文件上传的Action

创建表单:upload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

Jsp代码

<%
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>Struts2文件上传</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>
<center>
<h1>Struts 2完成上传</h1>
<form action="upload.action" method="post" enctype="multipart/form-data">
<table>
<tr>
<td>用户名:</td>
<td><input type="text" name="username" ></td>
</tr>
<tr>
<td>上传文件:</td>
<td><input type="file" name="myFile"></td>
</tr>
<tr>
<td><input type="submit" value="上传"></td>
<td><input type="reset"></td>
</tr>
</table>
</form>
</center>
</body>
</html>

<%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>Struts2文件上传</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>   <center>  <h1>Struts 2完成上传</h1>  <form action="upload.action" method="post" enctype="multipart/form-data">  <table>  <tr>  <td>用户名:</td>  <td><input type="text" name="username" ></td>  </tr>  <tr>  <td>上传文件:</td>  <td><input type="file" name="myFile"></td>  </tr>  <tr>  <td><input type="submit" value="上传"></td>  <td><input type="reset"></td>  </tr>  </table>  </form>  </center>  </body></html>

完成上传Action

package net.hncu.struts2.action;

Java代码

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadActionextends ActionSupport {
// username属性用来封装用户名
private String username;
// myFile属性用来封装上传的文件
private File myFile;
// myFileContentType属性用来封装上传文件的类型
private String myFileContentType;
// myFileFileName属性用来封装上传文件的文件名
private String myFileFileName;
//获得username值
public String getUsername() {
return username;
}
//设置username值
public void setUsername(String username) {
this.username = username;
}
//获得myFile值
public File getMyFile() {
return myFile;
}
//设置myFile值
public void setMyFile(File myFile) {
this.myFile = myFile;
}
//获得myFileContentType值
public String getMyFileContentType() {
return myFileContentType;
}
//设置myFileContentType值
public void setMyFileContentType(String myFileContentType) {
this.myFileContentType = myFileContentType;
}
//获得myFileFileName值
public String getMyFileFileName() {
return myFileFileName;
}
//设置myFileFileName值
public void setMyFileFileName(String myFileFileName) {
this.myFileFileName = myFileFileName;
}
public String execute() throws Exception {
//基于myFile创建一个文件输入流
InputStream is = new FileInputStream(myFile);
// 设置上传文件目录
String uploadPath = ServletActionContext.getServletContext()
.getRealPath("/upload");
// 设置目标文件
File toFile = new File(uploadPath,this.getMyFileFileName());
// 创建一个输出流
OutputStream os = new FileOutputStream(toFile);
//设置缓存
byte[] buffer = newbyte[1024];
int length = 0;
//读取myFile文件输出到toFile文件中
while ((length = is.read(buffer)) >0) {
os.write(buffer, 0, length);
}
System.out.println("上传用户"+username);
System.out.println("上传文件名"+myFileFileName);
System.out.println("上传文件类型"+myFileContentType);
//关闭输入流
is.close();
//关闭输出流
os.close();
return SUCCESS;
}
}

import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.InputStream;import java.io.OutputStream;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UploadAction extends ActionSupport {// username属性用来封装用户名private String username;// myFile属性用来封装上传的文件private File myFile;// myFileContentType属性用来封装上传文件的类型private String myFileContentType;// myFileFileName属性用来封装上传文件的文件名private String myFileFileName;//获得username值public String getUsername() {return username;}//设置username值public void setUsername(String username) {this.username = username;}//获得myFile值public File getMyFile() {return myFile;}//设置myFile值public void setMyFile(File myFile) {this.myFile = myFile;}//获得myFileContentType值public String getMyFileContentType() {return myFileContentType;}//设置myFileContentType值public void setMyFileContentType(String myFileContentType) {this.myFileContentType = myFileContentType;}//获得myFileFileName值public String getMyFileFileName() {return myFileFileName;}//设置myFileFileName值public void setMyFileFileName(String myFileFileName) {this.myFileFileName = myFileFileName;}public String execute() throws Exception {//基于myFile创建一个文件输入流InputStream is = new FileInputStream(myFile);// 设置上传文件目录String uploadPath = ServletActionContext.getServletContext().getRealPath("/upload");// 设置目标文件File toFile = new File(uploadPath, this.getMyFileFileName());// 创建一个输出流OutputStream os = new FileOutputStream(toFile);//设置缓存byte[] buffer = new byte[1024];int length = 0;//读取myFile文件输出到toFile文件中while ((length = is.read(buffer)) > 0) {os.write(buffer, 0, length);}System.out.println("上传用户"+username);System.out.println("上传文件名"+myFileFileName);System.out.println("上传文件类型"+myFileContentType);//关闭输入流is.close();//关闭输出流os.close();return SUCCESS;}}

配置上传Action

<?xml version="1.0" encoding="UTF-8" ?>

Java代码

<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="struts2"extends="struts-default">
<action name="upload" class="net.hncu.struts2.action.UploadAction">
<result name="success">/result.jsp</result>
<result name="input">/upload.jsp</result>
</action>
</package>
</struts>

<!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts><package name="struts2" extends="struts-default"><action name="upload" class="net.hncu.struts2.action.UploadAction"><result name="success">/result.jsp</result><result name="input">/upload.jsp</result></action></package><!-- Add packages here --></struts>

测试页面：

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