1.添加jar
Commons-fileupload.jar,
Commons-io.jar
2.定義Action類
package com.test.action;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class FileUpAction extends ActionSupport {
private static final long serialVersionUID = 572146812454l;
private static final int BUFFER_SIZE = 16 * 1024;
//單文件上傳
private File myFile;
private String contentType;
private String fileName;
private String imageFileName;
private String caption;
//批量上傳文件
private List < File > uploads = new ArrayList < File > ();
private List < String > uploadFileNames = new ArrayList < String > ();
private List < String > uploadContentTypes = new ArrayList < String > ();
public List < File > getUpload() {
return this .uploads;
}
public void setUpload(List < File > uploads) {
this .uploads = uploads;
}
public List < String > getUploadFileName() {
return this .uploadFileNames;
}
public void setUploadFileName(List < String > uploadFileNames) {
this .uploadFileNames = uploadFileNames;
}
public List < String > getUploadContentType() {
return this .uploadContentTypes;
}
public void setUploadContentType(List < String > contentTypes) {
this .uploadContentTypes = contentTypes;
}
public void setMyFileContentType(String contentType) {
this.contentType = contentType;
}
public void setMyFileFileName(String fileName) {
this.fileName = fileName;
}
public void setMyFile(File myFile) {
this.myFile = myFile;
}
public String getImageFileName() {
return imageFileName;
}
public String getCaption() {
return caption;
}
public void setCaption(String caption) {
this.caption = caption;
}
private static void copy(File src, File dst) {
try {
InputStream in = null;
OutputStream out = null;
try {
in = new BufferedInputStream(new FileInputStream(src),
BUFFER_SIZE);
out = new BufferedOutputStream(new FileOutputStream(dst),
BUFFER_SIZE);
byte[] buffer = new byte[BUFFER_SIZE];
while (in.read(buffer) > 0) {
out.write(buffer);
}
} finally {
if (null != in) {
in.close();
}
if (null != out) {
out.close();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
private static String getExtention(String fileName) {
System.out.println("filename="+fileName);
int pos = fileName.lastIndexOf(".");
return fileName.substring(pos);
}
@Override
public String execute() throws InterruptedException {
SaveOneFile(myFile,fileName);//保存單文件上傳
for(int i=0;i<uploadFileNames.size();i++)
{
Thread.sleep(200);//爲了不使文件名重複
SaveOneFile(uploads.get(i),uploadFileNames.get(i));//保存單文件上傳
}
return SUCCESS;
}
private void SaveOneFile(File file,String fileName)
{
imageFileName = new Date().getTime() + getExtention(fileName);
File imageFile = new File(ServletActionContext.getServletContext()
.getRealPath("UploadImages")
+ "/" + imageFileName);
copy(file, imageFile);
}
}
(注意：保存文件的目錄在Web-Inf下名稱爲:UploadImages
)
3.定義Struts.xml
<action name ="fileUpload" class ="com.test.action.FileUpAction" >
<interceptor-ref name ="fileUpload" >
<!-- 單位爲字節 這裏的大小是指每個文件上傳的大小，若多個文件上傳指每一個文件的大小 -->
<param name="maximumSize">4000000</param>
<!--指定上傳的文件類型-->
<param name ="allowedTypes" >
image/bmp,image/png,image/gif,image/pjpeg
</param>
</interceptor-ref>
<interceptor-ref name="defaultStack"></interceptor-ref>
<result name ="success" > /FileUp/ShowUpload.jsp </result >
</action >
4.定義jsp文件
<s:form action ="fileUpload" theme="simple" method ="POST" enctype ="multipart/form-data" >
<s:file name ="myFile" label ="Image File" /> <br>
<s:textfield name ="caption" label ="Caption" /> <br>
<br>
批量上傳<br>
<s:file label ="File (1)" name ="upload" /> <br>
<s:file label ="File (2)" name ="upload" /> <br>
<s:file label ="FIle (3)" name ="upload" /> <br>
<s:submit />
</s:form >
