struts2 基础3 文件上传、拦截器

2022-07-26 23:16:47

文件上传：

1、将头设置为enctype=”multipart/form-data”

 <form action="${pageContext.request.contextPath }/upload/upload1" method="post" enctype="multipart/form-data">

     文件<input type="file" name="image"><br>

     <input type="submit" value="上传">

 </form>

2、写接收处理的方法，有两种，一种是自己实现IO流，一种是使用FileUtils

 package cn.gs.ly;

 import java.io.File;

 import java.io.FileInputStream;

 import java.io.FileNotFoundException;

 import java.io.FileOutputStream;

 import java.io.InputStream;

 import java.io.OutputStream;

 import org.apache.commons.io.FileUtils;

 import org.apache.struts2.ServletActionContext;

 import com.opensymphony.xwork2.ActionContext;

 import com.opensymphony.xwork2.ActionSupport;

 public class UploadAction extends ActionSupport {

     private File image;              //struts2封装好的   上传的文件

     private String imageFileName;    //上传输入域的文件名

     private String imageContentType; //上传文件的MIME类型

     //setter/getter方法

     public String getImageContentType() {

         return imageContentType;

     }

     public void setImageContentType(String imageContentType) {

         this.imageContentType = imageContentType;

     }

     public String getImageFileName() {

         return imageFileName;

     }

     public void setImageFileName(String imageFileName) {

         this.imageFileName = imageFileName;

     }

     public File getImage() {

         return image;

     }

     public void setImage(File image) {

         this.image = image;

     }

     public String execute1(){

         System.out.println("文件类型："+imageContentType);

         //文件存放的真实路径

         String path = ServletActionContext.getServletContext().getRealPath("files");

         System.out.println("文件存放路径:"+path);

         File f = new File(path);

         if(!f.exists()){

             f.mkdirs();  //创建一个路径

         }

         try {

 //            //自己实现IO流 。构建输入输出流

 //            InputStream in = new FileInputStream(image);

 //            OutputStream out = new FileOutputStream(f+"\\"+imageFileName);

 //            byte b[] = new byte[1024];

 //            int len=-1;

 //            while((len=in.read(b))!=-1){

 //                out.write(b, 0, len);

 //            }

 //            out.close();

 //            in.close();

             //使用FileUtils

             FileUtils.copyFile(image, new File(path,imageFileName));

             ActionContext.getContext().put("message", "文件上传成功");

             return SUCCESS;

         } catch (Exception e) {

             e.printStackTrace();

             return ERROR;

         }

     }

 }

多文件上传：

 package cn.gs.ly;

 import java.io.File;

 import java.io.FileInputStream;

 import java.io.FileNotFoundException;

 import java.io.FileOutputStream;

 import java.io.InputStream;

 import java.io.OutputStream;

 import org.apache.commons.io.FileUtils;

 import org.apache.struts2.ServletActionContext;

 import com.opensymphony.xwork2.ActionContext;

 import com.opensymphony.xwork2.ActionSupport;

 public class UploadAction2 extends ActionSupport {

     private File[] image;              //struts2封装好的   上传的多个文件数组

     private String[] imageFileName;    //上传输入域的文件名

     private String[] imageContentType; //上传文件的MIME类型

     //setter/getter方法

     public File[] getImage() {

         return image;

     }

     public void setImage(File[] image) {

         this.image = image;

     }

     public String[] getImageFileName() {

         return imageFileName;

     }

     public void setImageFileName(String[] imageFileName) {

         this.imageFileName = imageFileName;

     }

     public String[] getImageContentType() {

         return imageContentType;

     }

     public void setImageContentType(String[] imageContentType) {

         this.imageContentType = imageContentType;

     }

     public String execute2(){

         try {

         if(image!=null&&image.length>){

             //文件存放的真实路径

             String path = ServletActionContext.getServletContext().getRealPath("files");

             System.out.println("文件存放路径:"+path);

             for(int i=;i<image.length;i++){

                 FileUtils.copyFile(image[i], new File(path,imageFileName[i]));

                 System.out.println("文件类型："+imageContentType[i]);

             }

         }

             ActionContext.getContext().put("message", "文件上传成功");

             return SUCCESS;

         } catch (Exception e) {

             e.printStackTrace();

             return ERROR;

         }

     }

 }

 <?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.devMode" value="true"></constant>

     <constant name="struts.action.extension" value="do,,action"></constant>

     <constant name="struts.i18n.encoding" value="UTF-8"></constant>

     <!-- 全局布置  -->

     <package name="mypackage" extends="struts-default">

         <interceptors><!-- 全局拦截器    。拦截器必须在最前-->

             <interceptor name="loginInterceptor" class="cn.gs.ly.interceptor.LoginInterceptor"></interceptor>

             <interceptor-stack name="mydefaultInterceptor">

                 <interceptor-ref name="defaultStack"></interceptor-ref>

                 <interceptor-ref name="loginInterceptor"></interceptor-ref>

             </interceptor-stack>

         </interceptors>    

         <global-results><!-- 全局错误页 -->

             <result name="error" type="dispatcher">/customer/error.jsp</result>

         </global-results>

     </package>

     <package name="webObj" namespace="/webObj" extends="mypackage">

         <action name="webAction" class="cn.gs.ly.webAction" method="execute1">

             <result type="dispatcher" name="success">web.jsp</result>

         </action>

         <action name="webAction1" class="cn.gs.ly.webAction" method="execute2">

             <result type="dispatcher" name="success">web.jsp</result>

         </action>

     </package>

     <!--单文件上传upload。多文件上传upload2. -->

     <package name="upload" namespace="/upload" extends="mypackage">

         <action name="upload1" class="cn.gs.ly.UploadAction" method="execute1">

             <result type="dispatcher" name="success">/success.jsp</result>

             <result type="dispatcher" name="input">/upload1.jsp</result>

         </action>

         <action name="upload2" class="cn.gs.ly.UploadAction2" method="execute2">

             <result type="dispatcher" name="success">/success.jsp</result>

             <result type="dispatcher" name="input">/upload2.jsp</result>

         </action>

     </package>

     <package name="interceptor" namespace="/interceptor" extends="mypackage">

         <action name="visitAction" class="cn.gs.ly.UserAction" >

             <!--引用全局拦截器 -->

             <interceptor-ref name="mydefaultInterceptor"></interceptor-ref>

             <result type="dispatcher" name="success">/index.jsp</result>

             <result type="dispatcher" name="login">/login.jsp</result>

         </action>

     </package>

 </struts>

内置拦截器

自定义拦截器：

1、编写一个类，实现 com.opensymphony.xwork2.interceptor.Interceptor

2.编写代码逻辑，实现Interceptor类 public String intercept(ActionInvocation invocation) throws Exception {}方法

 package cn.gs.ly.interceptor;

 import javax.servlet.http.HttpSession;

 import org.apache.struts2.ServletActionContext;

 import com.opensymphony.xwork2.ActionInvocation;

 import com.opensymphony.xwork2.interceptor.Interceptor;

 public class LoginInterceptor implements Interceptor{

     @Override

     public void destroy() {

         // TODO Auto-generated method stub

     }

     @Override

     public void init() {

         // TODO Auto-generated method stub

     }

     @Override

     public String intercept(ActionInvocation invocation) throws Exception {

         System.out.println("进入拦截器");

         HttpSession session = ServletActionContext.getRequest().getSession();

         Object obj = session.getAttribute("user");

         if(obj==null){

             return "login";

         }else{

             return invocation.invoke();  //调用动作方法

         }

     }

 }

3、注册拦截器。拦截器定义好后，一定要在配置文件中进行注册：

 <interceptors><!-- 只是定义拦截器，并没有起作用-->

      <interceptor name="loginInterceptor" class="cn.gs.ly.interceptor.LoginInterceptor"></interceptor>

 </interceptors>

4、配置文件中的动作，要通过

1    <interceptor-ref name="loginInterceptor"></interceptor-ref>  <!-- 不采取 -->

注意：一旦动作中使用了自定义的拦截器，那么默认的就不起作用了。一般应该采用如下的做法：

    <interceptor-ref name="defaultStack"></interceptor-ref>

    <interceptor-ref name="loginInterceptor"></interceptor-ref>

多个动作类都要使用的话，可以通过package来进行组合。

         <interceptors><!-- 全局拦截器    。拦截器必须在错误页等最前-->

             <interceptor name="loginInterceptor" class="cn.gs.ly.interceptor.LoginInterceptor"></interceptor>

             <interceptor-stack name="mydefaultInterceptor">

                 <interceptor-ref name="defaultStack"></interceptor-ref>

                 <interceptor-ref name="loginInterceptor"></interceptor-ref>

             </interceptor-stack>

         </interceptors>

       <!-- 使用时引用全局拦截器 -->

       <interceptor-ref name="mydefaultInterceptor"></interceptor-ref>

完整配置：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.devMode" value="true"></constant>

     <constant name="struts.action.extension" value="do,,action"></constant>

     <constant name="struts.i18n.encoding" value="UTF-8"></constant>

     <!-- 全局布置  -->

     <package name="mypackage" extends="struts-default">

         <interceptors><!-- 全局拦截器    。拦截器必须在错误页等最前-->

             <interceptor name="loginInterceptor" class="cn.gs.ly.interceptor.LoginInterceptor"></interceptor>

             <interceptor-stack name="mydefaultInterceptor">

                 <interceptor-ref name="defaultStack"></interceptor-ref>

                 <interceptor-ref name="loginInterceptor"></interceptor-ref>

             </interceptor-stack>

         </interceptors>    

         <global-results><!-- 全局错误页 -->

             <result name="error" type="dispatcher">/customer/error.jsp</result>

         </global-results>

     </package>

     <package name="webObj" namespace="/webObj" extends="mypackage">

         <action name="webAction" class="cn.gs.ly.webAction" method="execute1">

             <result type="dispatcher" name="success">web.jsp</result>

         </action>

         <action name="webAction1" class="cn.gs.ly.webAction" method="execute2">

             <result type="dispatcher" name="success">web.jsp</result>

         </action>

     </package>

     <!--单文件上传upload。多文件上传upload2. -->

     <package name="upload" namespace="/upload" extends="mypackage">

         <action name="upload1" class="cn.gs.ly.UploadAction" method="execute1">

             <result type="dispatcher" name="success">/success.jsp</result>

             <result type="dispatcher" name="input">/upload1.jsp</result>

         </action>

         <action name="upload2" class="cn.gs.ly.UploadAction2" method="execute2">

             <result type="dispatcher" name="success">/success.jsp</result>

             <result type="dispatcher" name="input">/upload2.jsp</result>

         </action>

     </package>

     <package name="interceptor" namespace="/interceptor" extends="mypackage">

         <action name="visitAction" class="cn.gs.ly.UserAction" >

             <!--引用全局拦截器 -->

             <interceptor-ref name="mydefaultInterceptor"></interceptor-ref>

             <result type="dispatcher" name="success">/index.jsp</result>

             <result type="dispatcher" name="login">/login.jsp</result>

         </action>

     </package>

 </struts>

码农公寓

相关文章