Struts2（12）:Struts2的上传下载续
使用Struts2结束common的fileupload和io两个包进行上传下载开发
首先编写upload.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gbk"%> <%@ taglib prefix="s" uri="/struts-tags"%> <html> <body> <s:form action="upload" theme="simple" enctype="multipart/form-data"> <table align="center" width="40%"> <tr> <td>username:</td> <td><s:textfield name="username"></s:textfield></td> </tr> <tr> <td>password:</td> <td><s:password name="password"></s:password></td> </tr> <tr> <td>file:</td> <td><s:file name="file"></s:file></td> </tr> <tr> <td><s:submit></s:submit></td> <td><s:reset></s:reset></td> </tr> </table> </s:form> </body> </html>
配置struts.xml文件
<constant name="struts.i18n.encoding" value="gbk"></constant> <!--将struts2的默认编码改为gbk --> <constant name="struts.multipart.saveDir" value="c:\\"></constant> <action name="upload" class="com.test.action.UploadAction"> <result name="success">/uploadResult.jsp</result> </action>
UploadAction.java，上传的文件会放入WebRoot/upload目录下
package com.test.action;
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 {
private String username;
private String password;
private File file;
//下面两个变量是文件名与文件类型，Struts2会自动为以下两变量赋值
private String fileFileName;
private String fileContentType;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public File getFile() {
return file;
}
public void setFile(File file) {
this.file = file;
}
public String getFileFileName() {
return fileFileName;
}
public void setFileFileName(String fileFileName) {
this.fileFileName = fileFileName;
}
public String getFileContentType() {
return fileContentType;
}
public void setFileContentType(String fileContentType) {
this.fileContentType = fileContentType;
}
public String execute() throws Exception {
//所谓文件上传，其实就是一个输入输出的操作，从一个输入流写到一个输出流。
InputStream is = new FileInputStream(file);
String root = ServletActionContext.getRequest().getRealPath("upload");
File destFile = new File(root,this.getFileFileName());
OutputStream os = new FileOutputStream(destFile);
byte[] buffer = new byte[400];
int length = 0;
while((length= is.read(buffer)) > 0){
os.write(buffer, 0, length);
}
is.close();
os.close();
return SUCCESS;
}
}
uploadResult.jsp得到返回的结果
<%@ page language="java" import="java.util.*" pageEncoding="gbk"%> <%@ taglib prefix="s" uri="/struts-tags" %> <html> <body> username:<s:property value="username"/><br> password:<s:property value="password"/><br> file:<s:property value="fileFileName"/> </body> </html>
如何上传指定个数的文件?如同时上传3个，则需要修改action类，使用集合类来支持
package com.test.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport {
private String username;
private String password;
private List<File> file;
//下面两个变量是文件名与文件类型，Struts2会自动为以下两变量赋值
private List<String> fileFileName;
private List<String> fileContentType;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public List<File> getFile() {
return file;
}
public void setFile(List<File> file) {
this.file = file;
}
public List<String> getFileFileName() {
return fileFileName;
}
public void setFileFileName(List<String> fileFileName) {
this.fileFileName = fileFileName;
}
public List<String> getFileContentType() {
return fileContentType;
}
public void setFileContentType(List<String> fileContentType) {
this.fileContentType = fileContentType;
}
public String execute() throws Exception {
for(int i = 0;i < file.size(); i++){
InputStream is = new FileInputStream(file.get(i));
String root = ServletActionContext.getRequest().getRealPath("upload");
File destFile = new File(root,this.getFileFileName().get(i));
OutputStream os = new FileOutputStream(destFile);
byte[] buffer = new byte[400];
int length = 0;
while((length= is.read(buffer)) > 0){
os.write(buffer, 0, length);
}
is.close();
os.close();
}
return SUCCESS;
}
}