《struts2权威指南》学习笔记之struts2文件上传

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Struts2.0

Struts Apache JSP XML Web

struts2没有提供自己的请求解析器，也就是说，struts2不会自己区处理multipart/form-data的请求，它需要调用其他请求解析器，将HTTP请求中的表单域解析出来，但struts2在原有的上传解析器上作了进一步封装，更进一步简化了文件上传

Struts2的struts.properties配置文件中，配置struts2的上传文件解析器

struts.multipart.parser=jakarta (srtuts2默认)，也可以设置为常用的cos,pell等

配置上传页面：

引用

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK" />
<title>简单的文件上传</title>
</head>
<body>
<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>

配置上传action

引用

package lee;

import com.opensymphony.xwork2.Action;
import org.apache.struts2.ServletActionContext;
import java.io.File;
import java.io.*;

import com.opensymphony.xwork2.ActionSupport;

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
    ...{
        System.out.println("开始上传单个文件-----------------------");
        System.out.println(getSavePath());
        System.out.println("==========" + getUploadFileName());
        System.out.println("==========" + getUploadContentType());
        System.out.println("==========" + getUpload());
        //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;
    }
}

struts配置文件

引用

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

    <constant name="struts.custom.i18n.resources" value="globalMessages"/>
    <constant name="struts.i18n.encoding" value="GBK"/>

    <package name="lee" extends="struts-default">

        <action name="upload" class="lee.UploadAction">
            <param name="savePath">/upload</param>
            <result>/succ.jsp</result>
        </action>
    </package>
</struts>

web.xml

引用

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <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>

    <filter>
      <filter-name>struts-cleanup</filter-name>
      <filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class>
    </filter>
    <filter-mapping>
      <filter-name>struts-cleanup</filter-name>
      <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

这里web.xml多配置了一个ActionContextCleanUp的配置，这个类是一个filter,他的作用是方便strut2与 sitemesh整合，与文件上传本没有关系，但不加载这个filter,可能在上传出出现莫名的异常，加入后就稳定了，可能是strut2的bug吧

文件上传工程页面：

引用

<%...@ 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>

运行，选择一个jpg图片，提交，就可以看到上传的页面显示出来了

通常，我们希望限定上传文件的类型，比如说只能上传图片，还需要进一步改造

首先改造Action,增加一个属性和一个方法，属性表示允许上传的文件类型，方法进行验证，是否允许上传

引用

package lee;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;

import org.apache.struts2.ServletActionContext;
import java.io.*;

import com.opensymphony.xwork2.ActionSupport;

/** *//**
* @author yeeku.H.lee kongyeeku@163.com
* @version 1.0
* <br>Copyright (C), 2005-2008, yeeku.H.Lee
* <br>This program is protected by copyright laws.
* <br>Program Name:
* <br>Date:
*/

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

    //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
    ...{
        System.out.println("开始上传单个文件-----------------------");
        System.out.println(getSavePath());
        System.out.println("==========" + getUploadFileName());
        System.out.println("==========" + getUploadContentType());
        System.out.println("==========" + getUpload());

        //判断是否允许上传
        String filterResult=filterType(this.getAllowTypes().split(","));
        if(filterResult!=null)...{
            ActionContext.getContext().put("typeError", "您要上传的文件类型不正确");
            return filterResult;
        }
        //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;
    }

    public String filterType(String[] types)...{
        String fileType=this.getUploadContentType();
        for(String type:types)...{
            if(type.equals(fileType))...{
                return null;
            }
        }
        return INPUT;
    }

    public String getAllowTypes() ...{
        return allowTypes;
    }

    public void setAllowTypes(String allowTypes) ...{
        this.allowTypes = allowTypes;
    }
}

修改struts.xml定义文件类型及错误返回页面：

引用

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

    <constant name="struts.custom.i18n.resources" value="globalMessages"/>
    <constant name="struts.i18n.encoding" value="GBK"/>

    <package name="lee" extends="struts-default">

        <action name="upload" class="lee.UploadAction">
            <param name="allowTypes">image/bmp,image/jpg,image/png,image/gif,image/jpeg</param>
            <param name="savePath">/upload</param>
            <result>/succ.jsp</result>
            <result name="input">/upload.jsp</result>
        </action>
    </package>
</struts>

修改上传页面：upload.jsp

引用

<%...@ page language="java" contentType="text/html; charset=GBK"%>
<%...@taglib prefix="s" uri="/struts-tags"%>
<%...@ page isELIgnored="false" %>
<%...@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GBK" />
<title></title>
</head>
<body>
${requestScope.typeError}
<form action="upload.action" method="post" enctype="multipart/form-data">
      <input type="text" name="title" /><br>
      <input type="file" name="upload" /><br>
    <input value="upload" type="submit" />
</form>
</body>
</html>

文章来源:http://blog.csdn.net/daryl715/archive/2008/02/28/2127229.aspx

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2008-03-03 18:04
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