struts2文件上传

Posted 2020-08-17 小葱拌豆腐

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1.创建一个index.jsp界面和success.jsp上传成功界面

index.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>  
  <body>
  
    <s:form action="files/add"  method="post" enctype="multipart/form-data">
        <s:file label="图片上传" name="upload"/>
         <s:submit value="提交"/>
    </s:form>

success.jsp

  <body>
    文件操作成功！！
  </body>

2.创建对应的struts.xml文件

<?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>
<!--设置文件上传的大小  -->
<constant name="struts.multipart.maxSize" value="5000000000"></constant>
<constant name="struts.devMode" value="true"/>
 <package name="default" namespace="/files" extends="struts-default">
 
 
  <action name="add" class="cn.bdqn.action.UploadAction" method="upload">
  <!-- 限制文件只能是图片
  <interceptor-ref name="fileUpload">
    <param name="allowedTypes">image/jpeg</param>
  </interceptor-ref>
  <interceptor-ref name="defaultStack"></interceptor-ref> -->
    <result>/success.jsp</result>
    <result  name="input">/index.jsp</result>
  </action>
 </package>
</struts>

3.创建对应的UploadAction

属性名的规范底层代码 FileUploadInterceptor中

 File[] files = multiWrapper.getFiles(inputName);
                    if (files != null && files.length > 0) {
                        List<File> acceptedFiles = new ArrayList<File>(files.length);
                        List<String> acceptedContentTypes = new ArrayList<String>(files.length);
                        List<String> acceptedFileNames = new ArrayList<String>(files.length);
                        String contentTypeName = inputName + "ContentType";
                        String fileNameName = inputName + "FileName";

public class UploadAction extends ActionSupport {
   private  File upload;   //上传的文件  和前台file标签中的name属性 一致
   private  String uploadFileName;   //上传的文件名称   底层有规定，必须按照规范来
   private  String uploadContentType;   //上传的文件的类型
   
    
      //文件上传的方法
    public  String  upload(){
        System.out.println("进入了文件的上传......");
        //指定文件上传的路径
        String  path=ServletActionContext.getServletContext().getRealPath("/upload");
        //File.separatorChar  系统分隔符  区别linux和windows系统
        String pathName=path+File.separatorChar+uploadFileName;
        System.out.println("上传文件的全名称："+pathName);
        try {
            FileUtils.copyFile(upload, new File(pathName));
        } catch (IOException e) {
            e.printStackTrace();
            return INPUT;
        }
        
        return  SUCCESS;
    }


    public File getUpload() {
        return upload;
    }


    public void setUpload(File upload) {
        this.upload = upload;
    }


    public String getUploadFileName() {
        return uploadFileName;
    }


    public void setUploadFileName(String uploadFileName) {
        this.uploadFileName = uploadFileName;
    }


    public String getUploadContentType() {
        return uploadContentType;
    }


    public void setUploadContentType(String uploadContentType) {
        this.uploadContentType = uploadContentType;
    }
    
    
}

4.多文件上传创建index2.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>  
  <body>
  
    <s:form action="files/adds"  method="post" enctype="multipart/form-data">
        <s:file label="图片上传" name="upload"/>
        <s:file label="图片上传" name="upload"/>
        <s:file label="图片上传" name="upload"/>
         <s:submit value="提交"/>
    </s:form>
  
  </body>

5.在struts.xml文件中新增

 <!-- 多个文件上传 -->
  <action name="adds" class="cn.bdqn.action.UploadAction2" method="upload">
    <result>/success.jsp</result>
    <result  name="input">/index2.jsp</result>
  </action>

6.创建对应的UploadAction2

public class UploadAction2 extends ActionSupport {
   private  File [] upload;   //上传的文件
   private  String [] uploadFileName;   //上传的文件名称
   private  String [] uploadContentType;   //上传的文件的类型
   
      //文件上传的方法
    public  String  upload(){
        System.out.println("进入了多文件的上传......");
         String path= ServletActionContext.getServletContext().getRealPath("/upload");
         String pathName="";
          //遍历 用户选择的文件
         for (int i = 0; i < upload.length; i++) {
             pathName= path+File.separatorChar+uploadFileName[i];
             try {
                 //把用户选择的文件复制到 指定的文件下
                FileUtils.copyFile(upload[i], new  File(pathName));
            } catch (IOException e) {
                e.printStackTrace();
                return  INPUT;
            }
        }
         
        return  SUCCESS;
    }


    public File[] getUpload() {
        return upload;
    }


    public void setUpload(File[] upload) {
        this.upload = upload;
    }


    public String[] getUploadFileName() {
        return uploadFileName;
    }


    public void setUploadFileName(String[] uploadFileName) {
        this.uploadFileName = uploadFileName;
    }


    public String[] getUploadContentType() {
        return uploadContentType;
    }


    public void setUploadContentType(String[] uploadContentType) {
        this.uploadContentType = uploadContentType;
    }


}

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