struts2文件上传(单文件/多文件)

公共部分:在maven项目pom文件下加入struts.jar包 

<dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-core</artifactId>
    <version>2.5.5</version>
 </dependency>

公共部分:配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0" id="WebApp_1509502455974">

  <display-name>Archetype Created Web Application</display-name>
  <filter>
      <filter-name>struts2</filter-name>
      <filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <welcome-file-list>
        <welcome-file>/oneFile.jsp</welcome-file>
    </welcome-file-list>
</web-app>

单个文件上传开始：

第一步jsp页面写入

<form action="fileUploadAction" method="post" enctype="multipart/form-data">
    <p><input type="text" name="username"></p>
    <p>图片：<input type="file" name="upload"></p>
    <input type="submit" value="提交">
</form>
<p>显示图片：</p>
<img src="upload/${uploadFileName}" width="300">

第二步：配置struts.xml

<constant name="struts.multipart.maxSize" value="5000000"></constant>
<package name="struts" namespace="/" extends="struts-default">
        <action name="fileUploadAction" class="org.maven.action.FileUploadAction">
           <result name="success">/index.jsp</result>
        </action>
</package>

第三步:配置单个文件上传的action类

package org.maven.action;

import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.ServletActionContext;

import javax.servlet.ServletContext;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

/**
 * @author du
 * @version 单文件上传
 */
public class FileUploadAction extends ActionSupport {

    private String username;
    private File upload;
    private String uploadContentType;
    private String uploadFileName;
    private String savePath;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    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 savePath;
    }

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

    @Override
    public String execute() throws Exception {
        ServletContext application = ServletActionContext.getServletContext();
        savePath =application.getRealPath("/upload");
        //输入流
        FileInputStream fis =new FileInputStream(getUpload());
        byte[] bytes =new byte[fis.available()];
        fis.read(bytes);
        //输出流
        FileOutputStream fos = new FileOutputStream(getSavePath()+"\\"+getUploadFileName());
        fos.write(bytes);
        System.out.println("上传文件结束，请查看");
        return super.execute();
    }
}

多个文件上传开始：

第一步jsp页面写入，这里遍历集合的方式，用struts2提供的标签 iterator 可以实现

<form action="oneUploadAction" method="post" enctype="multipart/form-data">
    <p>图片1：<input type="file" name="upload"></p>
    <p>图片2：<input type="file" name="upload"></p>
    <input type="submit" value="提交">
</form>
<p>显示图片:</p>
<!-- 遍历值 --> 
<s:iterator value="uploadFileName">
    <p><img src="upload/<s:property/>" width="300"></p>
</s:iterator>

第二步：配置struts.xml

<constant name="struts.multipart.maxSize" value="5000000"></constant>
<package name="struts" namespace="/" extends="struts-default">
        <action name="oneUploadAction" class="org.maven.action.oneUploadAction">
            <result name="success">/oneFile.jsp</result>
        </action>
</package>

第三步:配置多个文件上传的action类

package org.maven.action;

import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.ServletActionContext;

import javax.servlet.ServletContext;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

/**
 * @author du
 * @version 多文件上传
 */
public class oneUploadAction extends ActionSupport {
    private File[] upload;
    private String[] uploadContentType;
    private String[] uploadFileName;
    private String savePath;

    public String getSavePath() {
        return ServletActionContext.getServletContext().getRealPath("/upload");
    }

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

    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;
    }

    @Override
    public String execute() throws Exception {
        for (int i=0;i<upload.length;i++){
            //输入流
            FileInputStream fis = new FileInputStream(upload[i]);
			byte[] bytes = new byte[fis.available()];
			fis.read(bytes);
            //输出流
			FileOutputStream fos = new FileOutputStream(getSavePath()+"\\"+uploadFileName[i]);
			fos.write(bytes);
        }
        return super.execute();
    }
}