Struts2文件上传

Struts2提供了文件上传的框架，Struts2默认的文件上传框架是cos,大家也可以根据自己的需要修改Struts2中的文件上传框架，对于文件上传来说，无论使用Struts2中的哪一种框架，上传方式都是比较简单的。下面用一个案例介绍Struts2的文件上传。

该案例比较简单，允许用户进行文件上传,上传成功提示文件上传的主题，上传失败则提示上传失败的提示,当然为了防止恶意上传，我专门做了一个简单的文件过滤，限制文件的格式

　　首先看页面的操作

上传成功的情况

上传失败的情况

接下来分析源码

　　uploadFile.jsp页面

<%@ 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>文件上传</title>
</head>
<body>
    <s:form action="upload" enctype="multipart/form-data">
            <s:textfield name="title">文件标题</s:textfield>
            <s:file name="upload" label="选择文件"></s:file>
            <s:submit value="上传"></s:submit>
    </s:form>
</body>
</html>

上传文件对应的Action

package test.Action;

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

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class fileUploadAction extends ActionSupport {
    private String title;
    private File upload;
    private String uploadContentType;
    private String uploadFileName;
    private String savePath;
    // 设置文件格式
    private String allowType;

    public String getAllowType() {
        return allowType;
    }

    public void setAllowType(String allowType) {
        this.allowType = allowType;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public File getUpload() {
        return upload;
    }

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

    public String getUploadContentType() {
        return uploadContentType;
    }

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

    public String getUploadFileName() {
        return uploadFileName;
    }

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

    public String getSavePath() {
        return ServletActionContext.getServletContext().getRealPath(savePath);
    }

    public void setSavePath(String savePath) {
        this.savePath = savePath;
    }

    @Override
    public String execute() throws Exception {
        // 获取文件内容
        FileInputStream fin = new FileInputStream(getUpload());
        // 定义一个byte数组
        byte[] buffer = new byte[1024];
        // 建立文件输出流,建立文件位置
        FileOutputStream fout = new FileOutputStream(getSavePath() + "\" + getUploadFileName());
        // 每读完1M的量就往文件里写
        int len = 0;
        while ((len = fin.read(buffer)) > 0) {
            fout.write(buffer, 0, len);
        }
        System.out.println("fileUploadAction [title=" + title + ", upload=" + upload + ", uploadContentType="
                + uploadContentType + ", uploadFileName=" + uploadFileName + ", savePath=" + savePath + "]");
        return SUCCESS;
    }

    public String filterFileType(String[] types) {
        // 获取文件的格式
        String fileType = this.getUploadContentType();
        System.out.println(fileType);
        if (fileType != null) {
            for (String Type : types) {
                if (Type.equals(fileType)) {
                    return null;
                } else
                    return ERROR;
            }

        }

        return ERROR;
    }

    @Override
    public void validate() {
            //接收验证结果 
             String Result=this.filterFileType(getAllowType().split(","));
             if(Result!=null)
             {
                 addFieldError("uploadError", "该文件格式 不正确");
             }
    }

}

Struts.xml代码

<?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>

    <constant name="struts.enable.DynamicMethodInvocation" value="true" />
    <constant name="struts.devMode" value="true" />

    <package name="upload" extends="struts-default">
        <action name="upload" class="test.Action.fileUploadAction">
                <param name="savePath">/WEB-INF/uploadFiles</param>
                <param name="allowType">image/x-png,</param>
                <result>/success.jsp</result>
                <result name="input">/uploadError.jsp</result>
        </action>
    </package>



</struts>

分别对应的成功和失败两个jsp 视图

<%@ 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>结果</title>
</head>
<body>
    上传成功
    文件标题:<s:property value="title" /><br>
    文件为:<s:property value="upload"/>
    
</body>
</html>

<%@ 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>更新失败</title>
</head>
<body>
    <s:fielderror name="uploadError"></s:fielderror>
</body>
</html>