一、单文件的上传
表单的enctype属性：
application/x-www-form-urlencoded:默认的编码方式。
multipart/form-data:会以二进制的方式处理表单数据，会将文件域指定文件的内容也封装到请求参数里。
text/plain:当action属性是mailto:URL的形式方便。
常用的上传框架是Common-FileUpload和COS，默认是Common-FileUpload，一旦框架获得了文件域对应的文件内容，我们就可以通过IO流将文件内容写入服务器的任意位置，从而完成文件上传。
可以通过struts.properties配置文件中，修改默认值：struts.multipart.parser=jakarta
1、处理上传文件的jsp页面
upload.jsp
1: <%@ page language="java" contentType="text/html; charset=UTF-8"
2: pageEncoding="UTF-8"%>
3: <%@ page import="java.util.*" %>
4: <%@ taglib prefix="s" uri="/struts-tags" %>
5: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
6: <html>
7: <%
8: String path = request.getContextPath();
9: String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
10: %>
11: <head>
12: <base href="<%=basePath%>">
13: <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
14: <title>Struts2文件上传</title>
15: </head>
16: <body>
17: <h1>Struts 2完成上传</h1>
18: <form action="upload.action" method="post" enctype="multipart/form-data">
19: <div style="color:red"><s:fielderror/> </div>
20: <table>
21: <tr>
22: <td>用户名:</td>
23: <td><input type="text" name="username" ></td>
24: </tr>
25: <tr>
26: <td>上传文件:</td>
27: <td><input type="file" name="myFile"></td>
28: </tr>
29: <tr>
30: <td><input type="submit" value="上传"></td>
31: <td><input type="reset"></td>
32: </tr>
33: </table>
34: </form>
35: </center>
36: </body>
37: </html>
2、UploadAction.java
1: package cc.openhome;
2: import java.io.File;
3: import java.io.FileInputStream;
4: import java.io.FileOutputStream;
5: import java.io.InputStream;
6: import java.io.OutputStream;
7: import org.apache.struts2.ServletActionContext;
8: import com.opensymphony.xwork2.ActionSupport;
9: public class UploadAction extends ActionSupport {
10: // username属性用来封装用户名
11: private String username;
12:
13: // myFile属性用来封装上传的文件
14: private File myFile;
15:
16: // myFileContentType属性用来封装上传文件的类型
17: private String myFileContentType;
18:
19: // myFileFileName属性用来封装上传文件的文件名
20: private String myFileFileName;
21:
22:
23: //获得username值
24: public String getUsername() {
25: return username;
26: }
27:
28: //设置username值
29: public void setUsername(String username) {
30: this.username = username;
31: }
32:
33: //获得myFile值
34: public File getMyFile() {
35: return myFile;
36: }
37:
38: //设置myFile值
39: public void setMyFile(File myFile) {
40: this.myFile = myFile;
41: }
42:
43: //获得myFileContentType值
44: public String getMyFileContentType() {
45: return myFileContentType;
46: }
47:
48: //设置myFileContentType值
49: public void setMyFileContentType(String myFileContentType) {
50: this.myFileContentType = myFileContentType;
51: }
52:
53: //获得myFileFileName值
54: public String getMyFileFileName() {
55: return myFileFileName;
56: }
57:
58: //设置myFileFileName值
59: public void setMyFileFileName(String myFileFileName) {
60: this.myFileFileName = myFileFileName;
61: }
62:
63: public String execute() throws Exception {
64:
65: //基于myFile创建一个文件输入流
66: InputStream is = new FileInputStream(myFile);
67:
68: // 设置上传文件目录
69: String uploadPath = ServletActionContext.getServletContext()
70: .getRealPath("/upload");
71:
72: // 设置目标文件
73: File toFile = new File(uploadPath, this.getMyFileFileName());
74:
75: // 创建一个输出流
76: OutputStream os = new FileOutputStream(toFile);
77:
78: //设置缓存
79: byte[] buffer = new byte[1024*1024];
80:
81: int length = 0;
82:
83: //读取myFile文件输出到toFile文件中
84: while ((length = is.read(buffer)) > 0) {
85: os.write(buffer, 0, length);
86: }
87: //关闭输入流
88: is.close();
89: //关闭输出流
90: os.close();
91: return SUCCESS;
92: }
93: }
94:
95:
3、配置struts.xml
1: <?xml version="1.0" encoding="UTF-8" ?>
2: <!DOCTYPE struts PUBLIC
3: "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
4: "http://struts.apache.org/dtds/struts-2.3.dtd">
5:
6: <struts>
7: <constant name="struts.custom.i18n.resources" value="messageResource"></constant>
8: <package name="openhome" extends="struts-default">
9: <action name="upload" class="cc.openhome.UploadAction">
10: <interceptor-ref name="fileUpload">
11: <param name="allowedTypes">image/bmp,image/png,image/gif,image/jpeg</param>
12: <param name="maximumSize">2000</param>
13: </interceptor-ref>
14: <interceptor-ref name="defaultStack" />
15: <result name="success">/WEB-INF/page/succ.jsp</result>
16: <result name="input">/upload.jsp</result>
17: </action>
18: </package>
19: <!-- Add packages here -->
20: </struts>
21:
4、succ.jsp
1: <%@ page language="java" contentType="text/html; charset=UTF-8"
2: pageEncoding="UTF-8"%>
3: <%@ taglib prefix="s" uri="/struts-tags" %>
4: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
5: <html>
6: <head>
7: <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
8: <title>Insert title here</title>
9: </head>
10: <body>
11: 上传成功！<br>
12: 上传用户：${username}<br>
13: 文件标题：${ myFileFileName }<br>
14: 文件类型：${ myFileContentType }<br>
15: 文件为：<br><img src="<s:property value="'upload/'+myFileFileName"/>"/>
16: </body>
17: </html>
5、运行结果
此时，上传文件必须满足：大小小于2000kb，而且是图片文件。
二、多文件的上传
1、uploadmany.jsp
1: <%@ page language="java" contentType="text/html; charset=UTF-8"
2: pageEncoding="UTF-8"%>
3: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
4: <html>
5: <head>
6: <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
7: <title>数组多文件上传</title>
8: </head>
9: <body>
10: <form action="upload.action" method="post" enctype="multipart/form-data">
11: 上传用户：<input type="text" name="username" /><br>
12: 选择第一个文件：<input type="file" name="myFile" /><br>
13: 选择第二个文件：<input type="file" name="myFile" /><br>
14: 选择第三个文件：<input type="file" name="myFile" /><br>
15: <input type="submit" value="上传">
16: <input type="reset">
17: </form>
18: </body>
19: </html>
2、UploadAction.jsp
1: package cc.openhome;
2:
3: import java.io.File;
4: import java.io.FileInputStream;
5: import java.io.FileOutputStream;
6: import java.io.InputStream;
7: import java.io.OutputStream;
8: import java.util.List;
9: import org.apache.struts2.ServletActionContext;
10: import com.opensymphony.xwork2.ActionSupport;
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: private List<File> myFile;
18:
19: // myFileContentType属性用来封装上传文件的类型
20: private List<String> myFileContentType;
21:
22: // myFileFileName属性用来封装上传文件的文件名
23: private List<String> myFileFileName;
24:
25: //定义所有Action允许上传的类型
26: private String allowTypes;
27:
28: public String getAllowTypes() {
29: return allowTypes;
30: }
31:
32: public void setAllowTypes(String allowTypes) {
33: this.allowTypes = allowTypes;
34: }
35:
36: //获得username值
37: public String getUsername() {
38: return username;
39: }
40:
41: //设置username值
42: public void setUsername(String username) {
43: this.username = username;
44: }
45:
46: //获得myFile值
47: public List<File> getMyFile() {
48: return myFile;
49: }
50:
51: //设置myFile值
52: public void setMyFile(List<File> myFile) {
53: this.myFile = myFile;
54: }
55:
56: //获得myFileContentType值
57: public List<String> getMyFileContentType() {
58: return myFileContentType;
59: }
60:
61: //设置myFileContentType值
62: public void setMyFileContentType(List<String> myFileContentType) {
63: this.myFileContentType = myFileContentType;
64: }
65:
66: //获得myFileFileName值
67: public List<String> getMyFileFileName() {
68: return myFileFileName;
69: }
70:
71: //设置myFileFileName值
72: public void setMyFileFileName(List<String> myFileFileName) {
73: this.myFileFileName = myFileFileName;
74: }
75: public String execute() throws Exception {
76: List<File> files=getMyFile();
77: for(int i=0;i<files.size();i++){
78: //基于myFile创建一个文件输入流
79: InputStream is = new FileInputStream(files.get(i));
80:
81: // 设置上传文件目录
82: String uploadPath = ServletActionContext.getServletContext()
83: .getRealPath("/upload");
84: // 设置目标文件
85: //File[] toFile = new File(uploadPath, this.getMyFileFileName());
86: File toFile = new File(uploadPath, this.getMyFileFileName().get(i));
87: // 创建一个输出流
88: OutputStream os = new FileOutputStream(toFile);
89:
90: //设置缓存
91: byte[] buffer = new byte[1024*1024];
92:
93: int length = 0;
94:
95: //读取myFile文件输出到toFile文件中
96: while ((length = is.read(buffer)) > 0) {
97: os.write(buffer, 0, length);
98: }
99: //关闭输入流
100: is.close();
101:
102: //关闭输出流
103: os.close();
104: }
105: return SUCCESS;
106: }
107: }
108:
109:
110:
3、struts.xml
1: <?xml version="1.0" encoding="UTF-8" ?>
2: <!DOCTYPE struts PUBLIC
3: "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
4: "http://struts.apache.org/dtds/struts-2.3.dtd">
5:
6: <struts>
7: <package name="sturts" extends="struts-default">
8: <action name="upload" class="cc.openhome.UploadAction">
9: <interceptor-ref name="fileUpload">
10: <!-- 用于规定只能上传的文件类型 -->
11: <param name="allowedTypes">image/bmp,image/png,image/gif,image/jpeg</param>
12: <param name="maximumSize">20000000</param>
13: </interceptor-ref>
14: <interceptor-ref name="defaultStack" />
15: <result name="success">/succ.jsp</result>
16: <result name="input">/upload.jsp</result>
17: </action>
18: </package>
19: </struts>
4、succ.jsp
1: <%@ page language="java" contentType="text/html; charset=UTF-8"
2: pageEncoding="UTF-8"%>
3: <%@ taglib prefix="s" uri="/struts-tags" %>
4: <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
5: <html>
6: <head>
7: <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
8: <title>图片显示</title>
9: </head>
10: <body>
11: <h2>上传成功！</h2>
12: 上传用户:${ username }<hr><br>
13: 第一个文件名:${ myFileFileName[0] }<br>
14: 第一个文件类型:${ myFileContentType[0] }<br>
15: 第一个文件为：<br><img src="<s:property value="'upload/'+myFileFileName[0]"/>"/><hr><br>
16: 第二个文件名:${ myFileFileName[1] }<br>
17: 第二个文件类型:${ myFileContentType[1] }<br>
18: 第二个文件为：<br><img src="<s:property value="'upload/'+myFileFileName[1]"/>"/><hr><br>
19: 第三个文件名:${ myFileFileName[2] }<br>
20: 第三个文件类型:${ myFileContentType[2] }<br>
21: 第三个文件为：<br><img src="<s:property value="'upload/'+myFileFileName[2]"/>"/><hr><br>
22: </body>
23: </html>
5、运行结果
