Struts2中文件上传下载实例
1.单文件上传
1 jsp页面： 2 3 <!-- 单文件上传 --> 4 <form action="Fileupload.action" method="post" 5 enctype="multipart/form-data"> 6 username: 7 <input type="text" name="username" /> 8 <br /> 9 file: 10 <input type="file" name="file" /> 11 <br /> 12 <input type="submit" name="提交" /> 13 </form> 14 <!--注意：一定要写enctype="multipart/form-data"-->
1 action页面： 2 3 package com.Struts2.action; 4 5 import java.io.File; 6 import java.io.FileInputStream; 7 import java.io.FileOutputStream; 8 import java.io.InputStream; 9 import java.io.OutputStream; 10 11 import org.apache.struts2.ServletActionContext; 12 13 import com.opensymphony.xwork2.ActionSupport; 14 15 public class Fileupload extends ActionSupport { 16 17 /** 18 * 19 */ 20 private static final long serialVersionUID = 4038542394937191173L; 21 22 private String username; 23 private File file; 24 private String fileFileName;// 提交过来的file的名字,必须为FileName后缀 25 private String fileContentType;// 提交过来的file的MIME类型，必须以ContentType为后缀 26 27 public String getUsername() { 28 return username; 29 } 30 31 public void setUsername(String username) { 32 this.username = username; 33 } 34 35 public File getFile() { 36 return file; 37 } 38 39 public void setFile(File file) { 40 this.file = file; 41 } 42 43 public String getFileFileName() { 44 return fileFileName; 45 } 46 47 public void setFileFileName(String fileFileName) { 48 this.fileFileName = fileFileName; 49 } 50 51 public String getFileContentType() { 52 return fileContentType; 53 } 54 55 public void setFileContentType(String fileContentType) { 56 this.fileContentType = fileContentType; 57 } 58 59 @Override 60 public String execute() throws Exception { 61 String root = ServletActionContext.getServletContext().getRealPath( 62 "/upload"); 63 InputStream is = new FileInputStream(file); 64 OutputStream os = new FileOutputStream(new File(root, fileFileName)); 65 66 System.out.println("fileFileName:" + fileFileName); 67 // 因为file是存放在临时文件夹的文件，我们可以将其文件名和文件路径打印出来，看和之前的fileFileName是否相同 68 System.out.println("file:" + file.getName()); 69 System.out.println("file:" + file.getPath()); 70 71 byte[] buffer = new byte[500];// 用缓冲 72 int length = 0; 73 while (-1 != (length = is.read(buffer, 0, buffer.length))) { 74 os.write(buffer); 75 } 76 os.close(); 77 is.close(); 78 79 return SUCCESS; 80 } 81 }
2.多文件上传
1 jsp页面: 2 3 <script type="text/javascript"> 4 $(function() { 5 $("#button").click(function (){ 6 var html = $("<input type='file' name='file'/><br/>"); 7 var button = $("<input type='button' name='button' value='删除'/><br/>"); 8 $("#body div").append(html).append(button); 9 button.click(function (){ 10 html.remove(); 11 button.remove(); 12 }); 13 }); 14 }); 15 </script> 16 <body id="body"> 17 <!-- 多文件上传 --> 18 <form action="manyFileupload.action" method="post" 19 enctype="multipart/form-data"> 20 username: 21 <input type="text" name="username" /> 22 <br /> 23 file: 24 <input type="file" name="file" /> 25 <br /> 26 <input type="button" value="添加" id="button" /> 27 <br /> 28 <div></div> 29 <input type="submit" value="提交" /> 30 </form> 31 </body>
action页面： package com.Struts2.action; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.util.List; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; /** * 多文件上传 * * @author admin * */ public class ManyFileupload extends ActionSupport { /** * */ private static final long serialVersionUID = -1060365794705605882L; private String username; private List<File> file;// 因为有多个文件，所以用list集合,file属性指上传到的临时空间文件夹(upload)中的绝对路径 private List<String> fileFileName;// 上传的文件名称，自动会加载，因为是以FileName为后缀，会自动识别文件名称 private List<String> fileContentType;// 上传过来的文件类型，以ContentType后缀，自动识别类型(如:图片类型就是image/jepg) public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public List<File> getFile() { return file; } public void setFile(List<File> file) { this.file = file; } public List<String> getFileFileName() { return fileFileName; } public void setFileFileName(List<String> fileFileName) { this.fileFileName = fileFileName; } public List<String> getFileContentType() { return fileContentType; } public void setFileContentType(List<String> fileContentType) { this.fileContentType = fileContentType; } @Override public String execute() throws Exception { String root = ServletActionContext.getServletContext().getRealPath( "/upload"); for (int i = 0; i < file.size(); i++) { InputStream is = new FileInputStream(file.get(i)); OutputStream os = new FileOutputStream(new File(root, fileFileName .get(i))); byte[] buffer = new byte[500]; int length = 0; while (-1 != (length = is.read(buffer, 0, buffer.length))) { os.write(buffer); } os.close(); is.close(); } return super.execute(); } }
3.文件下载
1 jsp页面 2 3 <!-- 下载 --> 4 <form action="fileDownload.action"> 5 <input type="submit" value="下载" /> 6 </form> 7
action页面 package com.Struts2.action; import java.io.InputStream; import org.apache.struts2.ServletActionContext; import com.opensymphony.xwork2.ActionSupport; /** * 文件下载 * * @author admin * */ public class FileDownload extends ActionSupport { /** * */ private static final long serialVersionUID = 509550154000070698L; public InputStream getDownloadFile() { return ServletActionContext.getServletContext().getResourceAsStream( "upload/psb.jpg");// 从upload中选择一张图片进行下载 } @Override public String execute() throws Exception { return super.execute(); } }
4.struts.xml
1 <!-- 定义全局结果:必须写在action上面 --> 2 <global-results> 3 <result name="success">/success.jsp</result> 4 </global-results> 5 6 <!-- 单文件上传 --> 7 <action name="Fileupload" class="com.Struts2.action.Fileupload"></action> 8 <!-- 多文件上传--> 9 <action name="manyFileupload" class="com.Struts2.action.ManyFileupload"></action> 10 <!-- 文件下载 --> 11 <action name="fileDownload" class="com.Struts2.action.FileDownload"> 12 <result name="success" type="stream"> 13 <param name="contentDisposition">attachment;filename="psb.jpg"</param><!-- attachment表示弹出下载提示框 --> 14 <param name="inputName">downloadFile</param><!-- downloadFile对应action中的getDownloadFile方法 --> 15 </result> 16 </action>
本博客源码出自：http://www.cnblogs.com/xiaoluo501395377/archive/2012/10/26/2740882.html。谢谢他的分享！
