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>0){
                
            //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=0;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>