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我现在正在学习上传拦截器。文档说，所有上传文件的大小超过常量“struts.multipart.maxSize”的值都会在后台抛出异常，视图会进入INPUT视图。但是，在我的情况下，它不能抛出任何异常，并且视图没有进入 INPUT 视图（上传进度一直是 0%，见图）。

在此处输入图像描述

这是我上传的 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>Insert title here</title>
</head>
<body>
    <h1>HELLO!${session.user }</h1>
    <div align="center">
        <s:form method="post" enctype="multipart/form-data" action="upload">
        <s:fielderror></s:fielderror>
        <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 />
        </s:form>
    </div>
</body>
</html>

这是我的行动的代码

package com.aks.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.List;
import java.util.UUID;


import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport{


    /**
     * 
     */
    private static final long serialVersionUID = -6671906825564499267L;

    private static final int BUFFER_SIZE = 4096;

    private List<File> upload;
    private List<String> uploadFileName;
    private List<String> uploadContentType;
    private String savePath;

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


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


    public List<File> getUpload() {
        return upload;
    }


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


    public List<String> getUploadFileName() {
        return uploadFileName;
    }


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


    public List<String> getUploadContentType() {
        return uploadContentType;
    }


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


    @Override
    public String execute() throws Exception {
        String newFileName = (UUID.randomUUID() + uploadFileName.get(0).substring(uploadFileName.get(0).lastIndexOf(".")));
        System.out.println(newFileName);
        System.out.println(getSavePath());
        FileInputStream fis = new FileInputStream(upload.get(0));
        FileOutputStream fos = new FileOutputStream(getSavePath() + "\\" + newFileName);
        System.out.println(getSavePath());
        FileChannel fcIn = fis.getChannel();
        FileChannel fcOut = fos.getChannel();
        ByteBuffer buffer = ByteBuffer.allocate(BUFFER_SIZE);
        while(true){
            buffer.clear();
            int r = fcIn.read(buffer);
            if(r == -1){
                break;
            }
            buffer.flip();
            fcOut.write(buffer);
        }
        getUploadFileName().set(0, newFileName);
        fcIn.close();
        fcOut.close();
        fis.close();
        fos.close();
        return SUCCESS;
    }
}

这是结果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>显示上传图片</title>
</head>
<body>
    <img src="upload/${uploadFileName['0']} " />
    <s:debug></s:debug>
</body>
</html>

最后就是这个动作的struts.xml

<?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="false" />
    <constant name="struts.devMode" value="true" />
    <constant name="struts.multipart.maxSize" value="100000000" /> <!-- 20MB -->
    <constant name="struts.multipart.saveDir" value="/temp" />

    <package name="default" namespace="/" extends="struts-default">
        <action name="index">
            <result name="success">index.jsp</result>
        </action>
        <action name="login" class="com.aks.action.LoginAction">
            <result name="input">index.jsp</result>
            <result name="success">/WEB-INF/jsp/welcome.jsp</result>
            <result name="error">/WEB-INF/jsp/error.jsp</result>
        </action>
        <action name="upload" class="com.aks.action.UploadAction">
            <interceptor-ref name="defaultStack">
                <param name="fileUpload.allowedTypes">image/png,image/jpeg,application/x-zip-compressed,application/octet-stream</param>
                <param name="fileUpload.maximumSize">90000000</param>
            </interceptor-ref>
            <param name="savePath">/upload</param>
            <result name="input">index.jsp</result>
            <result name="success">/WEB-INF/jsp/showImage.jsp</result>
            <result name="error">/WEB-INF/jsp/error.jsp</result>
        </action>
    </package>


    <!-- Add packages here -->

</struts>

我的开发环境：eclipse4.5.1+tomcat8+jdk1.8+struts2.3.24

为什么不能抛出异常，为什么不去输入视图？

4

1 回答 1

0

这是一个已知问题，在此答案中进行了分析，并且（正如您在更新中看到的那样），它已在 Struts2 2.3.18 中“修补”。

只需升级到2.3.24.1并jakarta-stream用作 Multipart 解析器。

于 2016-01-08T17:17:57.217 回答