1 文件上传的表单
<html>
<head>
<base href="<%=basePath%>">
<title>Struts2文件上传</title>
</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>
2 文件上传的Action
这里需要除了Struts本身需要的包以外，还有
commons-fileupload-1.2.1.jar
commons-io-1.4.jar
这两个包。
Action中字段必须遵守一下命名规则
private File xxx；封装该文件对应的文件内容。
private String xxxFileName;该文件的文件名称。
private String xxxContentType;该文件的文件类型。
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（这样设置的目录在tomcat中）
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;
}
}
3 Struts.xml
<struts>
<package name="struts2" extends="struts-default">
<action name="upload" class="net.hncu.struts2.action.UploadAction">
<interceptor-ref name="fileUpload">
<param name="allowedTypes"> application/msword</param>
<param name="maximumSize">20000</param>
</interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
<result name="success">/result.jsp</result>
<result name="input">/upload.jsp</result>
</action>
</package>
</struts>
关于上传文件大小的控制，请参见：http://blog.sina.com.cn/s/blog_67aaf4440100ya3w.html
原帖地址：http://ihanfeng.iteye.com/blog/834232
