资源描述
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：
<constant name="struts.multipart.paeser" value="cos"></constant>
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
1. <%
2. String path = request.getContextPath();
3. String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
4. %>
5.
6. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
7. <html>
8. <head>
9. <base href="<%=basePath%>">
10.
11. <title>Struts2文件上传</title>
12.
13. <meta http-equiv="pragma" content="no-cache">
14. <meta http-equiv="cache-control" content="no-cache">
15. <meta http-equiv="expires" content="0">
16. <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
17. <meta http-equiv="description" content="This is my page">
18. <!--
19. <link rel="stylesheet" type="text/css" href="styles.css">
20. -->
21.
22. </head>
23.
24. <body>
25. <center>
26. <h1>Struts 2完成上传</h1>
27. <form action="upload.action" method="post" enctype="multipart/form-data">
28. <table>
29. <tr>
30. <td>用户名:</td>
31. <td><input type="text" name="username" ></td>
32. </tr>
33. <tr>
34. <td>上传文件:</td>
35. <td><input type="file" name="myFile"></td>
36. </tr>
37. <tr>
38. <td><input type="submit" value="上传"></td>
39. <td><input type="reset"></td>
40. </tr>
41. </table>
42. </form>
43. </center>
44. </body>
45. </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
1. import java.io.File;
2. import java.io.FileInputStream;
3. import java.io.FileOutputStream;
4. import java.io.InputStream;
5. import java.io.OutputStream;
6.
7. import org.apache.struts2.ServletActionContext;
8.
9. import com.opensymphony.xwork2.ActionSupport;
10.
11. public class UploadAction extends ActionSupport {
12. // username属性用来封装用户名
13. private String username;
14.
15. // myFile属性用来封装上传的文件
16. private File myFile;
17.
18. // myFileContentType属性用来封装上传文件的类型
19. private String myFileContentType;
20.
21. // myFileFileName属性用来封装上传文件的文件名
22. private String myFileFileName;
23.
24.
25. //获得username值
26. public String getUsername() {
27. return username;
28. }
29.
30. //设置username值
31. public void setUsername(String username) {
32. this.username = username;
33. }
34.
35. //获得myFile值
36. public File getMyFile() {
37. return myFile;
38. }
39.
40. //设置myFile值
41. public void setMyFile(File myFile) {
42. this.myFile = myFile;
43. }
44.
45. //获得myFileContentType值
46. public String getMyFileContentType() {
47. return myFileContentType;
48. }
49.
50. //设置myFileContentType值
51. public void setMyFileContentType(String myFileContentType) {
52. this.myFileContentType = myFileContentType;
53. }
54.
55. //获得myFileFileName值
56. public String getMyFileFileName() {
57. return myFileFileName;
58. }
59.
60. //设置myFileFileName值
61. public void setMyFileFileName(String myFileFileName) {
62. this.myFileFileName = myFileFileName;
63. }
64.
65. public String execute() throws Exception {
66.
67. //基于myFile创建一个文件输入流
68. InputStream is = new FileInputStream(myFile);
69.
70. // 设置上传文件目录
71. String uploadPath = ServletActionContext.getServletContext()
72. .getRealPath("/upload");
73.
74. // 设置目标文件
75. File toFile = new File(uploadPath, this.getMyFileFileName());
76.
77. // 创建一个输出流
78. OutputStream os = new FileOutputStream(toFile);
79.
80. //设置缓存
81. byte[] buffer = new byte[1024];
82.
83. int length = 0;
84.
85. //读取myFile文件输出到toFile文件中
86. while ((length = is.read(buffer)) > 0) {
87. os.write(buffer, 0, length);
88. }
89. System.out.println("上传用户"+username);
90. System.out.println("上传文件名"+myFileFileName);
91. System.out.println("上传文件类型"+myFileContentType);
92. //关闭输入流
93. is.close();
94.
95. //关闭输出流
96. os.close();
97.
98. return SUCCESS;
99. }
100.
101. }
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
1. <!DOCTYPE struts PUBLIC
2. "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
3. "http://struts.apache.org/dtds/struts-2.0.dtd">
4. <struts>
5.
6. <package name="struts2" extends="struts-default">
7. <action name="upload" class="net.hncu.struts2.action.UploadAction">
8. <result name="success">/result.jsp</result>
9. <result name="input">/upload.jsp</result>
10. </action>
11. </package>
12.
13. <!-- Add packages here -->
14.
15. </struts>
测试页面：
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