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java struts2入门学习实例－－使用struts2快速实现多个文件上传

2014-01-16 01:13 976 查看

一、错误提示信息配置

昨天说到更改默认错误配置信息，我测试很多遍，一直都不对。下面贴出来，待以后有好方法了再补充吧。

首先新建一个properties文件，这里命名为testupload.properties,内容为：

struts.messages.error.file.too.large=\u6587\u4EF6\u592A\u5927{0} "{1}" "{2}" {3}
struts.messages.error.content.type.not.allowed=\u6587\u4EF6\u7C7B\u578B\u4E0D\u5141\u8BB8! {0} "{1}" "{2}" {3}
struts.messages.error.file.extension.not.allowed=\u4E0D\u5141\u8BB8\u7684\u6269\u5C55\u540D! {0} "{1}" "{2}" {3}


这里将默认提示信息改为中文的。upload.xml中内容如下：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
<!-- 对上传文件总大小进行设置 -->
<constant name="struts.multipart.maxSize" value="20971520"></constant>
<!-- 错误信息提示 -->
 <constant name="struts.custom.i18n.resources" value="testupload"/>

<package name="upload" extends="struts-default">
<action name="UploadAction" class="action.UploadAction" method="uploadMethod">
<result name="success" type="dispatcher">
/WEB-INF/upload_success.jsp
</result>
<result name="input" type="dispatcher">
upload.jsp
</result>
<!-- 对系统的拦截器进行设置 -->
<interceptor-ref name="fileUpload">
<!-- 对单个上传文件的大小进行设置,5M -->
<param name="maximumSize">5242880</param>
<!-- 对允许的文件扩展名进行设置,这里以英文逗号隔开 -->
<param name="allowedExtensions">.txt,.xml</param>
<!-- 对允许的文件类型进行设置，这里以英文逗号进行隔开 -->
<param name="allowedTypes">text/plain,text/xml</param>
</interceptor-ref>
<!-- 显示引用默认的拦截器 -->
<interceptor-ref name="defaultStack"></interceptor-ref>
</action>
</package>

</struts>


二、多个文件上传

只需要更改upload.jsp中的部分内容即可：

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"  %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<s:form action="UploadAction" enctype="multipart/form-data" method="POST">
<s:textfield label="上传用户" name="username"/>
<s:file label="上传文件" name="upload" />
<s:file label="上传文件" name="upload" />
<s:file label="上传文件" name="upload" />

<s:submit value="提交"/>
</s:form>
</body>
</html>


结果如下所示：

package action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import com.opensymphony.xwork2.ActionSupport;

/**
* @ClassName: UploadAction
* @Description: 文件上传
* @author: amosli
* @email:amosli@infomorrow.com
* @date Jan 14, 2014 1:50:28 AM
*/
public class UploadAction extends ActionSupport {
private static final long serialVersionUID = -8920466592471253212L;
private String username;// 用户名
private String[] uploadContentType;// 上传文件的类型,(Fileupload拦截器传入的参数)
private File[] upload;// 上传的文件,(Fileupload拦截器传入的参数)
private String[] uploadFileName;// 上传文件的真实文件名，(Fileupload拦截器传入的参数)
private String uploadPath;

public void setUploadPath(String uploadPath) {
this.uploadPath = uploadPath;
}

public void setUsername(String username) {
this.username = username;
}

public String[] getUploadContentType() {
return uploadContentType;
}

public void setUploadContentType(String[] uploadContentType) {
this.uploadContentType = uploadContentType;
}

public File[] getUpload() {
return upload;
}

public void setUpload(File[] upload) {
this.upload = upload;
}

public String[] getUploadFileName() {
return uploadFileName;
}

public void setUploadFileName(String[] uploadFileName) {
this.uploadFileName = uploadFileName;
}

public String getUsername() {
return username;
}

public String uploadMethod() throws Exception {
//        ServletContext context = ServletActionContext.getServletContext();
//        String real_path = context.getRealPath("/WEB-INF/upload/");
for (int i = 0; i < upload.length; i++) {
InputStream inputStream = new FileInputStream(upload[i]);
OutputStream outputStream = new FileOutputStream(uploadPath + "/" + uploadFileName[i]);
byte[] b = new byte[1024];
int len = 0;
while ((len = inputStream.read(b)) > 0) {
outputStream.write(b, 0, len);
}
// 关闭流
inputStream.close();
outputStream.close();
// 删除tmp文件,最好是用tyrcatch finally进行删除
// upload[i].delete();
}

return SUCCESS;
}

}


View Code
最后，运行效果如下：







本文源码:https://github.com/amosli/strut2_learn
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