Struts2之通过commons-fileupload实现文件上传

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先引入包commons-fileupload-1.2.jar 或者更高版本

commons-io-1.3.1.jar

在webRoot目录下建立upload文件夹 这是重点不然，要报错，系统找不到路径

upload.jsp

<%@ page language="java" contentType="text/html; charset=GBK"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK" />
<title>修改默认的提示信息</title>
</head>
<body>
<div style="color:red">

<s:fielderror/>
</div>
<form action="upload.action" method="post" enctype="multipart/form-data">
    文件标题：<input type="text" name="title" /><br>
    选择文件：<input type="file" name="upload" /><br>
    <input value="上传" type="submit" />
</form>
</body>
</html>

succ.jsp

<%@ page language="java" contentType="text/html; charset=GBK"%>
<%@taglib prefix="s" uri="/struts-tags"%>
<html>
    <head>
        <title>上传成功</title>
    </head>
    <body>
        上传成功!<br>
        文件标题:<s:property value=" + title"/><br>
        文件为：<img src="<s:property value="'upload/' + uploadFileName"/>"/><br>
    </body>
</html>

web.xml

<filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
    </filter>

<filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
struts.xml

<struts>
    <constant name="struts.custom.i18n.resources" value="globalMessages"/>
    <constant name="struts.i18n.encoding" value="GBK"/>
    <package name="upload" extends="struts-default">
        <action name="upload" class="jCuckoo.UploadAction">
            <interceptor-ref name="fileUpload">
                <param name="allowedTypes">image/bmp,image/png,image/gif,image/jpeg</param>
                <param name="maximumSize">20000</param>
            </interceptor-ref>
            <interceptor-ref name="defaultStack"/>
            
            <param name="savePath">/upload</param>
            <result name="input"> /upload.jsp</result>
            <result>/succ.jsp</result>
        </action>
    </package>
</struts>

建立globalMessages.properties

struts.messages.error.content.type.not.allowed=您上传的文件类型只能是图片文件！请重新选择！
struts.messages.error.file.too.large=您要上传的文件太大，请重新选择！

建立globalMessages_zh_CN.properties

通过native2ascii 路径/globalMessages.properties 路径/globalMessages_zh_CN.properties

编译为字符代码

UploadAction.java

public class UploadAction extends ActionSupport {
    private String title;
    private File upload;
    private String uploadContentType;
    private String uploadFileName;

// 接受依赖注入的属性
private String savePath;

    // 接受依赖注入的方法
    public void setSavePath(String value) {
        this.savePath = value;
    }
    private String getSavePath() throws Exception {
        return ServletActionContext.getRequest().getRealPath(savePath);
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public void setUpload(File upload) {
        this.upload = upload;
    }
    public void setUploadContentType(String uploadContentType) {
        this.uploadContentType = uploadContentType;
    }
    public void setUploadFileName(String uploadFileName) {
        this.uploadFileName = uploadFileName;
    }
    public String getTitle() {
        return (this.title);
    }
    public File getUpload() {
        return (this.upload);
    }
    public String getUploadContentType() {
        return (this.uploadContentType);
    }
    public String getUploadFileName() {
        return (this.uploadFileName);
    }
    @Override
    public String execute() throws Exception {
        // 以服务器的文件保存地址和原文件名建立上传文件输出流
        FileOutputStream fos = new FileOutputStream(getSavePath() + "//"+ getUploadFileName());
        FileInputStream fis = new FileInputStream(getUpload());
        byte[] buffer = new byte[1024];
        int len = 0;
        while ((len = fis.read(buffer)) > 0) {
            fos.write(buffer, 0, len);
        }
        return SUCCESS;
    }
}