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