原创：多个文件的上传

来源：互联网发布：面向切面编程原理编辑：程序博客网时间：2024/04/29 03:21

多个文件上传的步骤：
第一步创建视图界面：
  <h1>
   多个文件的上传
  </h1>
  <s:form action="./uploads.action" method="post"
   enctype="multipart/form-data">
   <s:textfield name="title" label="标题"></s:textfield>
   <s:file name="upload" label="上传文件1"></s:file>
   <s:file name="upload" label="上传文件2"></s:file>
   <s:file name="upload" label="上传文件3"></s:file>
   <s:file name="upload" label="上传文件4"></s:file>
   <s:submit value="上传"></s:submit>

  </s:form>
第二步：创建配置文件的内容：
    <package name="test" extends="struts-default" namespace="/">

        <global-results>
            <result name="input">/index.jsp</result>
        </global-results>

        <action name="uploads" class="edu.ac.UploadsAction" method="uploadFiles">
          <param name="savePath">/uploads</param>
           <result>/sc.jsp</result>
        </action>

    </package>

第三：创建使用Array的Action类
package edu.ac;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class UploadsAction extends ActionSupport {
/** 封装请求参数的普通表单名称 */
private String title;
/** 采用数组封装多个文件域的文件内容 */
private File[] upload;
/** 采用数组封装多个文件域的文件类型文件域名称 ContentType */
private String[] uploadContentType;
/** 采用数组封装多个文件域的文件的名称文件域名称 FileName */
private String[] uploadFileName;
/** 接受文件依赖注入保存文件路径属性 */
private String savePath;

/** 通过set get 方法获取传递参数 */

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

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 ServletActionContext.getRequest().getRealPath(savePath);
}

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

public String uploadFiles() {
  System.out.println("---------多文件上传正在使用Array处理中------------");
  // 取得文件的保存路径
  File file = new File(getSavePath());
  if (!file.exists()) {
   file.mkdirs();
  }
  // 取得文件上传的文件数组
  File[] files = getUpload();
  /** 输入流：进行读取操作 */
  InputStream is = null;
  /** 输出流：进行写操作 */
  OutputStream os = null;

  try {
   for (int i = 0; i < files.length; i++) {
    /** 读取文件的创建 */
    is = new BufferedInputStream(new FileInputStream(files[i]));
    /** 写入文件的创建 */
    os = new BufferedOutputStream(new FileOutputStream(
      getSavePath() + "//" + getUploadFileName()[i]));
    byte buffer[] = new byte[1024];
    int len = 0;
    while ((len = is.read(buffer)) > 0) {
     os.write(buffer, 0, len);
     os.flush();/**立即写入*/
    }

   }
  } catch (FileNotFoundException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } finally {
   try {
    /** 关闭流 */
    if (is != null) {
     is.close();
    }
    if (os != null) {
     os.close();
    }
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }

return SUCCESS;
}

}

第五步：创建成功界面显示效果：
<h1>显示所有上传的文件</h1>

        <s:iterator var="filename" value="uploadFileName">
           <img src="<s:property value='%{savePath}'/>/<s:property value='%{filename}'/>"/>
        </s:iterator>
第六步：也可以采用List实现上传
package edu.ac;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class UploadsListAction extends ActionSupport {
/** 封装请求参数的普通表单名称 */
private String title;
/** 采用List封装多个文件域的文件内容 */
private List<File> upload;
/** 采用List封装多个文件域的文件类型文件域名称 ContentType */
private List<String> uploadContentType;
/** 采用List封装多个文件域的文件的名称文件域名称 FileName */
private List<String> uploadFileName;
/** 接受文件依赖注入保存文件路径属性 */
private String savePath;

/** 通过set get 方法获取传递参数 */

public String getSavePath() {
return ServletActionContext.getRequest().getRealPath(savePath);
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

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

public String uploadFiles() {
  System.out.println("---------多文件上传正在使用List处理中------------");
  // 取得文件的保存路径
  File file = new File(getSavePath());
  if (!file.exists()) {
   file.mkdirs();
  }
  // 取得文件上传的文件List
  List<File> files = getUpload();
  /** 输入流：进行读取操作 */
  InputStream is = null;
  /** 输出流：进行写操作 */
  OutputStream os = null;

  try {
   for (int i = 0; i < files.size(); i++) {
    /** 读取文件的创建 */
    is = new BufferedInputStream(new FileInputStream(files.get(i)));
    /** 写入文件的创建 */
    os = new BufferedOutputStream(new FileOutputStream(
      getSavePath() + "//" + getUploadFileName().get(i)));
    byte buffer[] = new byte[1024];
    int len = 0;
    while ((len = is.read(buffer)) > 0) {
     os.write(buffer, 0, len);
     os.flush();/**立即写入*/
    }

return SUCCESS;
}

}
/**可以简单修改配置文件中Action的Class内容进行测试修改后的结果如下*/
    <package name="test" extends="struts-default" namespace="/">

        <global-results>
            <result name="input">/index.jsp</result>
        </global-results>

        <action name="uploads" class="edu.ac.UploadsListAction" method="uploadFiles">
          <param name="savePath">/uploads</param>
           <result>/sc.jsp</result>
        </action>

    </package>