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struts2文件上传

来源:程序员人生   发布时间:2016-06-06 08:18:05 阅读次数:3675次

文件上传

       文件上传几近是每一个web利用实现的1个必须模块。文件上传的实现需要将表单元素属性enctype的值设置为multipart/form-data,使表单数据以2进制编码的方式提交。在接收此要求的Servlet中使用2进制流来获得内容,就能够获得上传文件的内容,从而实现文件的上传。

上传原理

在struts2中进行文件上传时,先需要将Form表单的enctype属性进行重新设置,该属性的取值就是决定表单数据的编码方式,有以下3个可选值:
       1)application/x-www-form-urlencoded.这是默许的编码方式。只处理表单域里的value属性值,采取这类编码方式的表单会将表单域的值处理成URL编码方式。
       2)multipart/form-data.这类编码方式的表单会以2进制流的方式来处理表单数据,将文件域指定文件的内容也封装到要求参数中。
       3)text/plain.当表单的action属性值为mailto:URL的情势时,这类编码方式比较方便,它主要适用于直接通过表单发送邮件。

  文件上传实例

实体类:
  
public class User { private String name;//姓名 private String photo;//照片 private int age;//年龄 private int sex;//性别 private String icard;//身份证号 private String phone;//联系电话 private String address;//联系地址 public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPhoto() { return photo; } public void setPhoto(String photo) { this.photo = photo; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public int getSex() { return sex; } public void setSex(int sex) { this.sex = sex; } public String getIcard() { return icard; } public void setIcard(String icard) { this.icard = icard; } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } }
Action类:
public class UserAction extends ActionSupport { private static final int BUFFER_SIZE = 40 * 40; private File upload;// 封装上传文件域的 private String uploadContentType;// 封装上传文件的类型 private String uploadFileName;// 封装上传文件名 private String savePath;// 封装上传文件的保存路径 private User user;// 创建User类对象user 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; } public User getUser() { return user; } public void setUser(User user) { this.user = user; } private static void copy(File source, File target) { InputStream inputStream = null;// 声明1个输入流 OutputStream outputStream = null;// 声明1个输出流 try { // 实例化输入流 inputStream = new BufferedInputStream(new FileInputStream(source), BUFFER_SIZE); outputStream = new BufferedOutputStream( new FileOutputStream(target), BUFFER_SIZE);// 实例化输出流 byte[] buffer = new byte[BUFFER_SIZE];// 定义字节数组buffer int length = 0;// 定义临时参数对象 while ((length = inputStream.read(buffer)) > 0) { outputStream.write(buffer, 0, length);// 如果上传的文件字节数大于0,将内容以字节情势写入 } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { if (null != inputStream) { try { inputStream.close();// 关闭输入流 } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } if (null != outputStream) { try { outputStream.close();// 关闭输出流 } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } @Override public String execute() throws Exception { // 根据服务器的文件保存地址和源文件名创建目录文件全路径 System.out.println("1" + this.getSavePath()); System.out.println("2" + this.getUploadFileName()); System.out.println("3" + this.getUpload()); System.out.println("4" + this.getTexts()); System.out.println("5" +this.getUploadContentType()); System.out.println("6" +ServletActionContext.getServletContext().getContextPath()); String path = ServletActionContext.getServletContext().getRealPath( this.getSavePath()) + "//" + this.getUploadFileName(); System.out.println(path); System.out.println("uploadFilename: " + uploadFileName); System.out.println("file: " + upload.getName()); System.out.println("file: " + upload.getPath()); user.setPhoto(this.uploadFileName);// 将上传的文件名称赋值给User类中的photo属性 File target = new File(path);// 定义目标文件对象 copy(this.upload, target);// 调用copy方法,实现文件的写入 return SUCCESS; } }

struts.xml中的配置,
<action name="user" class="com.mxl.action.UserAction"> <interceptor-ref name="fileUpload"> <param name="allowedTypes"> image/pjpeg,image/x-png,image/gif,image/bmp </param> <param name="maximumSize">5000</param> </interceptor-ref> <interceptor-ref name="defaultStack"/> <param name="savePath">/upload</param> <result>/show_file.jsp</result> <result name="input">/index.jsp</result> </action>
上传界面:
<s:form action="user" namespace="/" method="post" enctype="multipart/form-data"> <s:textfield name="user.name" label="姓名" size="20"/> <s:file name="upload" label="形象" size="20"/> <s:textfield name="user.age" label="年龄" size="20"/> <s:radio list="#{1:'男',2:'女'}" name="user.sex" listKey="key" listValue="value" value="1" label="性别" cssStype="border:0px;"/> <s:textfield name="user.icard" label="身份证号" size="20"/> <s:textfield name="user.phone" label="联系电话" size="20"/> <s:textfield name="user.address" label="家庭住址" size="20"/> <s:submit value="肯定录入" align="center"/> </s:form>
显示界面:
<table cellpadding="0" cellspacing="0" border="0" width="100%"> <tr> <td width="300px" align="right">姓名:</td> <td width="100px" align="left"><s:property value="user.name" /> </td> <td rowspan="5" align="center"><img src="upload/<s:property value="uploadFileName"/>"/><br />您的形象</td> </tr> <tr> <td width="300px" align="right">年龄:</td> <td><s:property value="user.age"/></td><td></td> </tr> <tr> <td width="300px" align="right">性别:</td> <td> <s:if test="user.sex==1"> 男 </s:if> <s:else> 女 </s:else> </td><td></td> </tr> <tr> <td width="300px" align="right">身份证号:</td> <td><s:property value="user.icard"/></td><td></td> </tr> <tr> <td width="300px" align="right">联系电话:</td> <td><s:property value="user.phone"/></td><td></td> </tr> <tr> <td width="300px" align="right">家庭住址:</td> <td><s:property value="user.address"/></td><td></td> </tr> </table>
多文件上传实例:
数组实现多文件上传,
Action类,
public class DocArrayAction extends ActionSupport{ private String name;//上传者 private File[] upload;//封装上传文件的属性 private String[] uploadContentType;//封装上传文件的类型 private String[] uploadFileName;//封装上传文件名 private String savePath;//封装上传文件保存路径 private Date createTime;//上传时间 public String getName() { return name; } public void setName(String name) { this.name = name; } 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; } public Date getCreateTime(){//实例化日期 createTime = new Date(); return createTime; } private static void copy(File source, File target) { InputStream inputStream = null;// 声明1个输入流 OutputStream outputStream = null;// 声明1个输出流 try { // 实例化输入流 inputStream = new BufferedInputStream(new FileInputStream(source)); outputStream = new BufferedOutputStream( new FileOutputStream(target));// 实例化输出流 byte[] buffer = new byte[1024];// 定义字节数组buffer int length = 0;// 定义临时参数对象 while ((length = inputStream.read(buffer)) > 0) { outputStream.write(buffer, 0, length);// 如果上传的文件字节数大于0,将内容以字节情势写入 } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { if (null != inputStream) { try { inputStream.close();// 关闭输入流 } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } if (null != outputStream) { try { outputStream.close();// 关闭输出流 } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } @Override public String execute() throws Exception { for(int i = 0; i < upload.length; i++){ String path = ServletActionContext.getServletContext().getRealPath( this.getSavePath()) + "//" + this.uploadFileName[i]; File target = new File(path);// 定义目标文件对象 copy(this.upload[i], target);// 调用copy方法,实现文件的写入 } return SUCCESS; } }

配置:
<action name="doc" class="com.mxl.action.DocArrayAction"> <interceptor-ref name="fileUpload"> <param name="maximumSize">50000</param> </interceptor-ref> <interceptor-ref name="defaultStack"/> <param name="savePath">/upload</param> <result>/show_doc.jsp</result> <result name="input">/input_doc.jsp</result> </action>

上传界面:
<s:form action="doc" namespace="/" method="post" enctype="multipart/form-data"> <s:textfield name="name" label="姓名" size="20"/> <s:file name="upload" label="选择文档" size="20"/> <s:file name="upload" label="选择文档" size="20"/> <s:file name="upload" label="选择文档" size="20"/> <s:file name="upload" label="选择文档" size="20"/> <s:file name="upload" label="选择文档" size="20"/> <s:submit value="肯定上传" align="center"/> </s:form>
上传成功界面:
<font style="font-size:12px; color:red">上传者<s:property value="name"/></font> <table cellpadding="0" cellspacing="0"> <tr> <th>文件名称</th> <th>上传时间</th> </tr> <s:iterator value="uploadFileName" status="st"> <tr> <td><s:property value="uploadFileName[#st.getIndex()]"/></td> <td><s:date name="createTime" format="yyyy-MM-dd HH:mm:ss"/></td> </tr> </s:iterator> </table>
List实现多文件上传:
Action类:
public class DocListAction extends ActionSupport{ private String name; private List<File> upload; private List<String> uploadContentType; private List<String> uploadFileName; private String savePath; private Date createTime; public String getName() { return name; } public void setName(String name) { this.name = name; } public List<File> getUpload() { return upload; } public void setUpload(List<File> upload) { this.upload = upload; } public List<String> getUploadContentType() { return uploadContentType; } public void setUploadContentType(List<String> uploadContentType) { this.uploadContentType = uploadContentType; } public List<String> getUploadFileName() { return uploadFileName; } public void setUploadFileName(List<String> uploadFileName) { this.uploadFileName = uploadFileName; } public String getSavePath() { return savePath; } public void setSavePath(String savePath) { this.savePath = savePath; } public Date getCreateTime(){ createTime = new Date(); return createTime; } public void setCreateTime(Date createTime){ this.createTime = createTime; } private static void copy(File source, File target) { InputStream inputStream = null;// 声明1个输入流 OutputStream outputStream = null;// 声明1个输出流 try { // 实例化输入流 inputStream = new BufferedInputStream(new FileInputStream(source)); outputStream = new BufferedOutputStream( new FileOutputStream(target));// 实例化输出流 byte[] buffer = new byte[1024];// 定义字节数组buffer int length = 0;// 定义临时参数对象 while ((length = inputStream.read(buffer)) > 0) { outputStream.write(buffer, 0, length);// 如果上传的文件字节数大于0,将内容以字节情势写入 } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } finally { if (null != inputStream) { try { inputStream.close();// 关闭输入流 } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } if (null != outputStream) { try { outputStream.close();// 关闭输出流 } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } @Override public String execute() throws Exception { for(int i = 0; i < upload.size(); i++){ String path = ServletActionContext.getServletContext().getRealPath( this.getSavePath()) + "//" + this.uploadFileName.get(i); File target = new File(path);// 定义目标文件对象 copy(this.upload.get(i), target);// 调用copy方法,实现文件的写入 } return SUCCESS; } }
配置:
<action name="docList" class="com.mxl.action.DocListAction"> <interceptor-ref name="fileUpload"> <param name="maximumSize">50000</param> </interceptor-ref> <interceptor-ref name="defaultStack"/> <param name="savePath">/upload</param> <result>/show_docList.jsp</result> <result name="input">/input_docList.jsp</result> </action>

上传界面:
<s:form action="docList" namespace="/" method="post" enctype="multipart/form-data"> <s:textfield name="name" label="姓名" size="20"/> <s:file name="upload" label="选择文档" size="20"/> <s:file name="upload" label="选择文档" size="20"/> <s:file name="upload" label="选择文档" size="20"/> <s:file name="upload" label="选择文档" size="20"/> <s:file name="upload" label="选择文档" size="20"/> <s:submit value="肯定上传" align="center"/> </s:form>

成功界面:
<font style="font-size:12px; color:red">上传者<s:property value="name"/></font> <table cellpadding="0" cellspacing="0"> <tr> <th>文件名称</th> <th>上传时间</th> </tr> <s:iterator value="uploadFileName" status="st" var="doc"> <tr> <td><a href="downLoad.action?downPath=upload/<s:property value="#doc"/>"><s:property value="#doc"/></a></td> <td><s:date name="createTime" format="yyyy-MM-dd HH:mm:ss"/></td> </tr> </s:iterator> </table>








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