Struts2(十五)实现文件上传

2019-11-14 23:38:00

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Struts2(十五)实现文件上传一、导入包

需要将commons-fileupload和commons-io包和struts包一起导入

实现步骤：

在jsp页面实现客户端选择上传文件
配置Struts.xml，拦截器会自动接收上传的文件
在Action中实现代码上传文件存入服务器中
跳转至新页面展示上传的文件

二、单个文件上传

上传页面

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!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>单个文件上传</title></head><body><form action="doUpload.action" method="post" enctype="multipart/form-data"><input type="file" name="upload"/><input type="submit" value="上传"></form></body></html>

上传成功页面

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%> <%@ taglib PRefix="s" uri="/struts-tags" %><!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>文件上传成功</title></head><body><h1>上传的文件</h1><img alt="图片" src="<s:property value='savePath'/>" /></body></html>

UploadAction

package com.pb.web.action;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import org.apache.commons.io.IOUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UploadAction extends ActionSupport {    //上传文件全路径、类型、文件名    private File upload;    private String uploadContentType;    private String uploadFileName;    //新文件保存路径和名称    private String savePah;    public String doUpload() throws IOException{        System.out.println(upload);        System.out.println(uploadContentType);        System.out.println(uploadFileName);        String newFileName=System.currentTimeMillis()+uploadFileName.substring(uploadFileName.lastIndexOf("."));        System.out.println("新的文件名:"+newFileName);        //获取上传路径        savePah=ServletActionContext.getServletContext().getRealPath("/upload/"+newFileName);        System.out.println("上传保存的路径和名称:"+savePah);        //使用文件输入、输出流写入文件        FileInputStream fis=new FileInputStream(upload);        FileOutputStream fos=new FileOutputStream(savePah);        //设置缓冲区大小        /*byte[] bytes=new byte[1024];        //读取文件        int length=fis.read(bytes);        while(length>0){            //写入文件            fos.write(bytes);            length=fis.read(bytes);        }*/        //复制文件        IOUtils.copy(fis, fos);        fos.flush();        fos.close();        fis.close();                return SUCCESS;    }    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 getSavePah() {        return savePah;    }    public void setSavePah(String savePah) {        this.savePah = savePah;    }            }

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" />   <package name="default" namespace="/" extends="struts-default">    <action name="doUpload" class="com.pb.web.action.UploadAction" method="doUpload">    <result name="success">    /singleUploadSuccess.jsp    </result>    <result name="error">    /error.jsp    </result>    <result name="input">    /singleUpload.jsp    </result>    </action>    </package></struts>

三、限制文件大小

在struts.xml中配置常量

<constant name="struts.multipart.maxSize" value="5000000"/>5M大小

在action下配置拦截器

<interceptor-ref name="fileUpload">    <param name="maximumSize">5000000</param>        </interceptor-ref>    <interceptor-ref name="defaultStack"></interceptor-ref>

五、限制文件类型

<interceptor-ref name="fileUpload">    <param name="allowedTypes">image/pjpeg,image/jpeg,image/gif,image/png</param>    <param name="maximumSize">5000000</param>        </interceptor-ref>    <interceptor-ref name="defaultStack"></interceptor-ref>

<?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="1000000" />    <constant name="struts.multipart.saveDir" value="/tmp"/>    <package name="default" namespace="/" extends="struts-default">    <action name="doupload" class="com.pb.web.action.UploadAction" method="upload">    <interceptor-ref name="fileUpload">            <param name="maximumSize">40000</param>             <param name="allowedTypes">image/jpeg,image/pjpeg,image/gif,image/png</param>        </interceptor-ref>         <interceptor-ref name="defaultStack"></interceptor-ref>    <result name="success">    /oneUploadSuccess.jsp    </result>    <result name="input">    /error.jsp    </result>    </action>    </package></struts>

六、多个文件上传

和单个文件上传一个只是接收参数变为数组

mulUpload.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!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>多个 文件上传</title><script type="text/Javascript" src="js/jquery-1.11.2.min.js"></script><script type="text/javascript">function addFile(){    /*  获取父元素*/    var parent=$("#add").parent();    /*创建新的节点  */    var file=$("<input type='file' name='upload' /><br/>");    /* 添中节点 */    parent.append(file);    }</script></head><body><form action="doupload.action" method="post" enctype="multipart/form-data"><input type="file" name="upload" /><input type="button" value="继续添加"  onclick="addFile();" id="add"/><input type="submit" value="上传" /><br/></form></body></html>

error.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@ taglib prefix="s" uri="/struts-tags" %><!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>上传失败</title></head><body>上传失败<a href="mulUpload.jsp">返回</a><s:debug/></body></html>

mulUploadSuccess.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><%@ taglib prefix="s" uri="/struts-tags" %><!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>上传成功</title></head><body><!--显示上传的图片  --><s:iterator value="savePath" var="i"><img alt="图片" src="<s:property value='#i'/>"></s:iterator><s:debug/></body></html>

UploadAction.java

package com.pb.web.action;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.util.ArrayList;import java.util.List;import org.apache.commons.io.IOUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class UploadAction extends ActionSupport {    // 文件上传路径、类型、名称    private List<File> upload;    private List<String> uploadFileName;    private List<String> uploadContentType;    // 新的文件名称    private List<String> savePath=new ArrayList<String>();    public String upload() throws IOException {        for (int i = 0; i < upload.size(); i++) {            //重命名 用长时间+原来的文件名            String newFileName = System.currentTimeMillis()+""+uploadFileName.get(i);            System.out.println("新的文件名:"+newFileName);        //获取上传路径            //将新的路径和名称添加入集合            savePath.add(ServletActionContext.getServletContext().getRealPath("/upload/"+newFileName));            System.out.println(savePath.get(i));            //读取文件            FileInputStream fis=new FileInputStream(upload.get(i));            //写入文件            FileOutputStream fos=new FileOutputStream(savePath.get(i));            //将文件从输入流，复制到输出流中            IOUtils.copy(fis, fos);            //强制刷新输出流，清空缓冲区            fos.flush();            fos.close();            fis.close();        }        return SUCCESS;    }    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;    }    public List<String> getSavePath() {        return savePath;    }    public void setSavePath(List<String> savePath) {        this.savePath = savePath;    }}

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" />    <!--设置文件大小拦截器  -->    <constant name="struts.multipart.maxSize" value="10000000"></constant>        <constant name="struts.multipart.saveDir" value="/tmp"/>    <package name="default" namespace="/" extends="struts-default">    <action name="doupload" class="com.pb.web.action.UploadAction" method="upload">        <interceptor-ref name="fileUpload">    <!--设置文件类型拦截器  -->    <param name="allowedTypes">image/jpeg,image/pjpeg,image/png</param>    <!--设置文件大小拦截器  -->    <param name="maximumSize">5000000</param>    </interceptor-ref>    <!-- struts默认的拦截器 -->    <interceptor-ref name="defaultStack" />        <result name="success">    /mulUploadSuccess.jsp    </result>    <result name="input">    /error.jsp    </result>    </action>    </package></struts>

更详细的请参考：struts下载包中的帮助文档：

file://stuts2/struts2-2.3.4.1-all/struts-2.3.4.1/docs/WW/file-upload.html

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