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struts2文件上传

需要用两个包（一般包含在struts2必须的包里面）：一个是commons-fileupload-1.3.2.jar，另一个是commons-io-2.2.jar

步骤：

第一步：做界面。
1.<input type="file">
2.<form enctype="multipart/form-data">

<h1>文件上传</h1>
<form action="Upload_upload" method="post" enctype="multipart/form-data"><!--固定格式，必须要有-->
标题：<input type="text" name="title"><br>
附件：<input type="file" name="file"><br><!--上传按钮-->
<input type="submit" value="submit">
</form>

第二步：做Action。

三个成员：1.File类型 2.String fileFileName属性名 3.String fileContentType属性名

法一（推荐）：org.apache.commons.io.FileUtils.copyFile很简单

import java.io.File;

import org.apache.commons.io.FileUtils;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {
    
    private File file;
    private String fileFileName;//上传的文件名
    private String fileContentType;//上传的文件类型
        ..
    FileUtils.copyFile(srcFile, destFile);//源文件，目的文件
        
}

法二：用IO流也可操作

InputStream is = new FileInputStream(file); 
OutputStream os = new FileOutputStream(new File(root, fileFileName));

byte[] buffer = new byte[500];
int length = 0;

while(-1 != (length = is.read(buffer, 0, buffer.length)))
{
os.write(buffer);
}

os.close();
is.close();

实例：上传一个文件

1.做界面

input.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>Insert title here</title>
</head>
<body>
<h1>文件上传</h1>
<form action="Upload_upload" method="post" enctype="multipart/form-data">
标题：<input type="text" name="title"><br>
附件：<input type="file" name="file"><br>
<input type="submit" value="submit">
</form>
</body>
</html>

upload.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>Insert title here</title>
</head>
<body>
<h1>上传成功</h1>

</body>
</html>

2.做Action

import java.io.File;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Random;

import org.apache.commons.io.FileUtils;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {
    private String title;
    private File file;
    private String fileFileName;
    private String fileContentType;
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public File getFile() {
        return file;
    }
    public void setFile(File file) {
        this.file = file;
    }
    public String getFileFileName() {
        return fileFileName;
    }
    public void setFileFileName(String fileFileName) {
        this.fileFileName = fileFileName;
    }
    public String getFileContentType() {
        return fileContentType;
    }
    public void setFileContentType(String fileContentType) {
        this.fileContentType = fileContentType;
    }
    
    public String input() {
        
        return SUCCESS;
    }
    public String upload() throws IOException {
        //随机数
        Random rand = new Random();
        //给随机数一个范围
        int n = rand.nextInt(9999);
        //格式化，缺失位补0
        DecimalFormat df = new DecimalFormat("0000");
        //把n放到format中格式化
        String no = df.format(n);
        
        //日期格式化器（年月日时分秒毫秒）
        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddhhmmsssss");
        //获取当前时间
        Date now = Calendar.getInstance().getTime();
        //把当前时间格式化
        String prefix = sdf.format(now);
        
        //把随机数、时间和文件名拼接作为复制后的文件名
        String fileName = prefix + "_" + no + "_" + fileFileName;
        //生成目的地址
        File destFile = new File("d:\"+fileName);
        //由源地址复制到目的地址
        FileUtils.copyFile(file, destFile);
        
        return SUCCESS;
    }
}

struts2.xml配置

<?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="*_*" class="maya.controller.{1}Action" method="{2}">
            <result>
                {1}/{2}.jsp
            </result>
        </action>
    </package> 
</struts>

运行：

选取文件，上传

查看D盘路径，文件已上传成功

实例二：批量上传文件

1.做界面

input.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>Insert title here</title>
</head>
<body>
<h1>多文件上传</h1>
<form action="UploadMany_upload" method="post" enctype="multipart/form-data">
标题：<input type="text" name="title"><br>
附件一：<input type="file" name="file"><br>
附件二：<input type="file" name="file"><br>
附件三：<input type="file" name="file"><br>
<input type="submit" value="提交">
</form>
</body>
</html>

upload.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>Insert title here</title>
</head>
<body>
<h3>上传成功</h3>
</body>
</html>

2.做Action

package maya.controller;

import java.io.File;
import java.io.IOException;
import org.apache.commons.io.FileUtils;
import com.opensymphony.xwork2.ActionSupport;

public class UploadManyAction extends ActionSupport{
    private String title;
    private File[] file;//数组形式存储批量文件
    private String[] fileFileName;
    private String[] fileContentType;
    
    public String input() {
        return SUCCESS;
    }
    public String upload() throws IOException {
        for (int i=0;i<file.length;i++) {
            File item = file[i];
            if (item != null) {
                File temp = new File("d:\"+fileFileName[i]);
                FileUtils.copyFile(item, temp);
            }
        }
        return SUCCESS;
    }
    
    
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public File[] getFile() {
        return file;
    }
    public void setFile(File[] file) {
        this.file = file;
    }
    public String[] getFileFileName() {
        return fileFileName;
    }
    public void setFileFileName(String[] fileFileName) {
        this.fileFileName = fileFileName;
    }
    public String[] getFileContentType() {
        return fileContentType;
    }
    public void setFileContentType(String[] fileContentType) {
        this.fileContentType = fileContentType;
    }
    
}

struts2.xml配置

<?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" />
    <!-- 设置文件上传（大小）允许的最大值 ，单位Byte-->
    <constant name="struts.multipart.maxSize" value="20971520"/> 
    <package name="default" namespace="/" extends="struts-default">        
     
        <action name="*_*" class="maya.controller.{1}Action" method="{2}">
            <result>
                {1}/{2}.jsp
            </result>
        </action>
    </package>
 
</struts>

运行：

查看上传的路径：

查看全文

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原文地址：https://www.cnblogs.com/jonsnow/p/6589432.html