struts2 基础3 文件上传、拦截器

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>