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”

1 <form action="${pageContext.request.contextPath }/upload/upload1" method="post" enctype="multipart/form-data">
2     文件<input type="file" name="image"><br>
3     <input type="submit" value="上传">
4 </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

 1 package cn.gs.ly;
 2 
 3 import java.io.File;
 4 import java.io.FileInputStream;
 5 import java.io.FileNotFoundException;
 6 import java.io.FileOutputStream;
 7 import java.io.InputStream;
 8 import java.io.OutputStream;
 9 
10 import org.apache.commons.io.FileUtils;
11 import org.apache.struts2.ServletActionContext;
12 
13 import com.opensymphony.xwork2.ActionContext;
14 import com.opensymphony.xwork2.ActionSupport;
15 
16 public class UploadAction extends ActionSupport {
17     private File image;              //struts2封装好的   上传的文件  
18     private String imageFileName;    //上传输入域的文件名
19     private String imageContentType; //上传文件的MIME类型
20     
21     //setter/getter方法
22     public String getImageContentType() {
23         return imageContentType;
24     }
25     public void setImageContentType(String imageContentType) {
26         this.imageContentType = imageContentType;
27     }
28     public String getImageFileName() {
29         return imageFileName;
30     }
31     public void setImageFileName(String imageFileName) {
32         this.imageFileName = imageFileName;
33     }
34     public File getImage() {
35         return image;
36     }    
37     public void setImage(File image) {
38         this.image = image;
39     }
40 
41     
42     public String execute1(){
43         System.out.println("文件类型："+imageContentType);
44         //文件存放的真实路径
45         String path = ServletActionContext.getServletContext().getRealPath("files");
46         System.out.println("文件存放路径:"+path);
47         File f = new File(path);
48         if(!f.exists()){
49             f.mkdirs();  //创建一个路径
50         }
51         
52         try {
53 //            //自己实现IO流 。构建输入输出流
54 //            InputStream in = new FileInputStream(image);
55 //            OutputStream out = new FileOutputStream(f+"\"+imageFileName);
56 //            byte b[] = new byte[1024];
57 //            int len=-1;
58 //            while((len=in.read(b))!=-1){
59 //                out.write(b, 0, len);
60 //            }
61 //            out.close();
62 //            in.close();
63             
64             //使用FileUtils
65             FileUtils.copyFile(image, new File(path,imageFileName));
66             
67             ActionContext.getContext().put("message", "文件上传成功");
68             return SUCCESS;
69         } catch (Exception e) {
70             e.printStackTrace();
71             return ERROR;
72         }
73     
74     }
75 }

多文件上传：

 1 package cn.gs.ly;
 2 
 3 import java.io.File;
 4 import java.io.FileInputStream;
 5 import java.io.FileNotFoundException;
 6 import java.io.FileOutputStream;
 7 import java.io.InputStream;
 8 import java.io.OutputStream;
 9 
10 import org.apache.commons.io.FileUtils;
11 import org.apache.struts2.ServletActionContext;
12 
13 import com.opensymphony.xwork2.ActionContext;
14 import com.opensymphony.xwork2.ActionSupport;
15 
16 public class UploadAction2 extends ActionSupport {
17     private File[] image;              //struts2封装好的   上传的多个文件数组  
18     private String[] imageFileName;    //上传输入域的文件名
19     private String[] imageContentType; //上传文件的MIME类型
20     
21     //setter/getter方法
22     public File[] getImage() {
23         return image;
24     }
25     public void setImage(File[] image) {
26         this.image = image;
27     }
28     public String[] getImageFileName() {
29         return imageFileName;
30     }
31     public void setImageFileName(String[] imageFileName) {
32         this.imageFileName = imageFileName;
33     }
34     public String[] getImageContentType() {
35         return imageContentType;
36     }
37     public void setImageContentType(String[] imageContentType) {
38         this.imageContentType = imageContentType;
39     }
40 
41     
42     public String execute2(){
43         try {
44         if(image!=null&&image.length>0){
45                 
46             //文件存放的真实路径
47             String path = ServletActionContext.getServletContext().getRealPath("files");
48             System.out.println("文件存放路径:"+path);
49             for(int i=0;i<image.length;i++){
50                 FileUtils.copyFile(image[i], new File(path,imageFileName[i]));
51                 System.out.println("文件类型："+imageContentType[i]);
52             }
53         }
54             ActionContext.getContext().put("message", "文件上传成功");
55             return SUCCESS;
56         } catch (Exception e) {
57             e.printStackTrace();
58             return ERROR;
59         }
60     
61     }
62 
63 
64 }

 1 <?xml version="1.0" encoding="UTF-8"?>
 2  <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">    
 5 <struts>
 6     <constant name="struts.devMode" value="true"></constant>
 7     <constant name="struts.action.extension" value="do,,action"></constant>
 8     <constant name="struts.i18n.encoding" value="UTF-8"></constant>
 9     
10     <!-- 全局布置  -->
11     <package name="mypackage" extends="struts-default">    
12         <interceptors><!-- 全局拦截器    。拦截器必须在最前-->
13             <interceptor name="loginInterceptor" class="cn.gs.ly.interceptor.LoginInterceptor"></interceptor> 
14             <interceptor-stack name="mydefaultInterceptor">
15                 <interceptor-ref name="defaultStack"></interceptor-ref>
16                 <interceptor-ref name="loginInterceptor"></interceptor-ref>
17             </interceptor-stack>
18         </interceptors>    
19         
20         <global-results><!-- 全局错误页 -->
21             <result name="error" type="dispatcher">/customer/error.jsp</result>
22         </global-results>
23     </package>
24     
25     <package name="webObj" namespace="/webObj" extends="mypackage">
26         <action name="webAction" class="cn.gs.ly.webAction" method="execute1">
27             <result type="dispatcher" name="success">web.jsp</result>
28         </action>
29         <action name="webAction1" class="cn.gs.ly.webAction" method="execute2">
30             <result type="dispatcher" name="success">web.jsp</result>
31         </action>
32     </package>
33     
34     <!--单文件上传upload。多文件上传upload2. -->
35     <package name="upload" namespace="/upload" extends="mypackage">
36         <action name="upload1" class="cn.gs.ly.UploadAction" method="execute1">
37             <result type="dispatcher" name="success">/success.jsp</result>
38             <result type="dispatcher" name="input">/upload1.jsp</result>
39         </action>
40         <action name="upload2" class="cn.gs.ly.UploadAction2" method="execute2">
41             <result type="dispatcher" name="success">/success.jsp</result>
42             <result type="dispatcher" name="input">/upload2.jsp</result>
43         </action>
44     </package>
45     
46     <package name="interceptor" namespace="/interceptor" extends="mypackage">
47         <action name="visitAction" class="cn.gs.ly.UserAction" >
48             <!--引用全局拦截器 -->
49             <interceptor-ref name="mydefaultInterceptor"></interceptor-ref>
50             
51             <result type="dispatcher" name="success">/index.jsp</result>
52             <result type="dispatcher" name="login">/login.jsp</result>
53         </action>
54     </package>
55     
56 </struts>

View Code

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

 1 package cn.gs.ly.interceptor;
 2 
 3 import javax.servlet.http.HttpSession;
 4 
 5 import org.apache.struts2.ServletActionContext;
 6 
 7 import com.opensymphony.xwork2.ActionInvocation;
 8 import com.opensymphony.xwork2.interceptor.Interceptor;
 9 
10 public class LoginInterceptor implements Interceptor{
11 
12     @Override
13     public void destroy() {
14         // TODO Auto-generated method stub
15         
16     }
17 
18     @Override
19     public void init() {
20         // TODO Auto-generated method stub
21         
22     }
23 
24     @Override
25     public String intercept(ActionInvocation invocation) throws Exception {
26         System.out.println("进入拦截器");
27         HttpSession session = ServletActionContext.getRequest().getSession();
28         Object obj = session.getAttribute("user");
29         if(obj==null){
30             return "login";
31         }else{
32             return invocation.invoke();  //调用动作方法
33         }
34     }
35     
36 }

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：

1 <interceptors><!-- 只是定义拦截器，并没有起作用-->
2      <interceptor name="loginInterceptor" class="cn.gs.ly.interceptor.LoginInterceptor"></interceptor> 
3 </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：

1    <interceptor-ref name="defaultStack"></interceptor-ref>
2    <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。

1         <interceptors><!-- 全局拦截器    。拦截器必须在错误页等最前-->
2             <interceptor name="loginInterceptor" class="cn.gs.ly.interceptor.LoginInterceptor"></interceptor> 
3             <interceptor-stack name="mydefaultInterceptor">
4                 <interceptor-ref name="defaultStack"></interceptor-ref>
5                 <interceptor-ref name="loginInterceptor"></interceptor-ref>
6             </interceptor-stack>
7         </interceptors>

1       <!-- 使用时引用全局拦截器 -->
2       <interceptor-ref name="mydefaultInterceptor"></interceptor-ref>

完整配置：struts.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2  <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">    
 5 <struts>
 6     <constant name="struts.devMode" value="true"></constant>
 7     <constant name="struts.action.extension" value="do,,action"></constant>
 8     <constant name="struts.i18n.encoding" value="UTF-8"></constant>
 9     
10     <!-- 全局布置  -->
11     <package name="mypackage" extends="struts-default">    
12         <interceptors><!-- 全局拦截器    。拦截器必须在错误页等最前-->
13             <interceptor name="loginInterceptor" class="cn.gs.ly.interceptor.LoginInterceptor"></interceptor> 
14             <interceptor-stack name="mydefaultInterceptor">
15                 <interceptor-ref name="defaultStack"></interceptor-ref>
16                 <interceptor-ref name="loginInterceptor"></interceptor-ref>
17             </interceptor-stack>
18         </interceptors>    
19         
20         <global-results><!-- 全局错误页 -->
21             <result name="error" type="dispatcher">/customer/error.jsp</result>
22         </global-results>
23     </package>
24     
25     <package name="webObj" namespace="/webObj" extends="mypackage">
26         <action name="webAction" class="cn.gs.ly.webAction" method="execute1">
27             <result type="dispatcher" name="success">web.jsp</result>
28         </action>
29         <action name="webAction1" class="cn.gs.ly.webAction" method="execute2">
30             <result type="dispatcher" name="success">web.jsp</result>
31         </action>
32     </package>
33     
34     <!--单文件上传upload。多文件上传upload2. -->
35     <package name="upload" namespace="/upload" extends="mypackage">
36         <action name="upload1" class="cn.gs.ly.UploadAction" method="execute1">
37             <result type="dispatcher" name="success">/success.jsp</result>
38             <result type="dispatcher" name="input">/upload1.jsp</result>
39         </action>
40         <action name="upload2" class="cn.gs.ly.UploadAction2" method="execute2">
41             <result type="dispatcher" name="success">/success.jsp</result>
42             <result type="dispatcher" name="input">/upload2.jsp</result>
43         </action>
44     </package>
45     
46     <package name="interceptor" namespace="/interceptor" extends="mypackage">
47         <action name="visitAction" class="cn.gs.ly.UserAction" >
48             <!--引用全局拦截器 -->
49             <interceptor-ref name="mydefaultInterceptor"></interceptor-ref>
50             
51             <result type="dispatcher" name="success">/index.jsp</result>
52             <result type="dispatcher" name="login">/login.jsp</result>
53         </action>
54     </package>
55     
56 </struts>