Struts2（五）

以下内容是基于导入struts2-2.3.32.jar包来讲的

1.文件上传

A.单文件上传

<body>
    <form action="${pageContext.request.contextPath }/one" method="post" enctype="multipart/form-data">
        <input type="file" name="file"/>
        <input type="submit" value="上传"/>
    </form>
</body>

 1 package com.rong.web.action;
 2 
 3 import java.io.File;
 4 
 5 import org.apache.commons.io.FileUtils;
 6 
 7 import com.opensymphony.xwork2.ActionSupport;
 8 
 9 public class MyAction extends ActionSupport {
10     private static final long serialVersionUID = -351587239525292420L;
11     //保存上传的文件对象，file对应表单元素名称，名称必须一致，拦截器会解析这个格式！
12     private    File file;
13     //文件名，必须为fileFileName
　　　　//FileName 固定的写法。必须为file+FileName
14     private String fileFileName;
15     //ContentType 固定的写法。必须为file+ContentType
16     private String fileContentType;
17     public File getFile() {
18         return file;
19     }
20     public void setFile(File file) {
21         this.file = file;
22     }
23     
24     public String getFileFileName() {
25         return fileFileName;
26     }
27     public void setFileFileName(String fileFileName) {
28         this.fileFileName = fileFileName;
29     }
30     public String getFileContentType() {
31         return fileContentType;
32     }
33     public void setFileContentType(String fileContentType) {
34         this.fileContentType = fileContentType;
35     }
36     @Override
37     public String execute() throws Exception {
38         //E:\apache-tomcat-7.0.82\work\Catalina\localhost\struts2\ upload_1742945b_24ed_4612_a2f4_b83cffa61620_00000000.tmp
39         //struts会保存到Tomcat服务器的struts2文件夹中创建临时文件，若不处理，执行完代码会把此临时文件删除
40         System.out.println(file.getAbsolutePath());
41         //butterfly.jpg
42         System.out.println(fileFileName);
43         //image/png
44         System.out.println(fileContentType);
45         File targetFile=new File("c:/", fileFileName);
46         FileUtils.copyFile(file, targetFile);
47         return SUCCESS;
48     }
49 }

文件类型： mime-type想了解的可以去Tomcat服务器的web.xml文件查看，里面有文件类型配置

E:\apache-tomcat-7.0.82\conf\web.xml

限制文件上传大小：

org.apache.commons.fileupload.FileUploadBase$SizeLimitExceededException: the request was rejected because its size (81498) exceeds the configured maximum (1024)

<?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>
    <!-- 配置限制文件上传大小为1K -->
    <constant name="struts.multipart.maxSize" value="1024"></constant>
    <package name="default" namespace="/" extends="struts-default" >
        
        <global-results>
            <!-- struts在文件上传失败的时候，会返回input的错误视图，在这里配置对应的页面！ -->
            <result name="input">/input.jsp</result>
            <result name="error">/error.jsp</result>
        </global-results>
        <global-exception-mappings>
            <exception-mapping result="error" exception="java.lang.Exception"></exception-mapping>
        </global-exception-mappings>
        <action name="one" class="com.rong.web.action.MyAction">
            <result>/one.jsp</result>
        </action>
    </package>
</struts>

B.多文件上传

input的name属性值必须一致

<body>
    <form action="${pageContext.request.contextPath }/one" method="post" enctype="multipart/form-data">
        <input type="file" name="file"/>
        <input type="file" name="file"/>
        <input type="file" name="file"/>
        <input type="submit" value="上传"/>
    </form>
</body>

 1 package com.rong.web.action;
 2 
 3 import java.io.File;
 4 
 5 import org.apache.commons.io.FileUtils;
 6 
 7 import com.opensymphony.xwork2.ActionSupport;
 8 
 9 public class MyAction extends ActionSupport {
10     private static final long serialVersionUID = -351587239525292420L;
11     //保存上传的文件对象，file对应表单元素名称，名称必须一致，拦截器会解析这个格式！
12     private    File[] file;
13     //文件名，必须为fileFileName
14     private String[] fileFileName;
15     //文件类型，必须为fileContentType
16     private String[] fileContentType;
17     
18     public File[] getFile() {
19         return file;
20     }
21 
22     public void setFile(File[] file) {
23         this.file = file;
24     }
25 
26     public String[] getFileFileName() {
27         return fileFileName;
28     }
29 
30     public void setFileFileName(String[] fileFileName) {
31         this.fileFileName = fileFileName;
32     }
33 
34     public String[] getFileContentType() {
35         return fileContentType;
36     }
37 
38     public void setFileContentType(String[] fileContentType) {
39         this.fileContentType = fileContentType;
40     }
41 
42     @Override
43     public String execute() throws Exception {
44         if(file!=null){
45             for(int i=0;i<file.length;i++){
46                 System.out.println(file[i]);
47                 System.out.println(fileFileName[i]);
48                 System.out.println(fileContentType[i]);
49                 File targetFile=new File("c:/", fileFileName[i]);
50                 FileUtils.copyFile(file[i], targetFile);
51             }
52         }
53         return SUCCESS;
54     }
55 }

E:\apache-tomcat-7.0.82\work\Catalina\localhost\struts2\upload_ca4933df_aa32_4fc4_bbd5_d5d887c68972_00000006.tmp
2018届毕业设计2017-6-8.rar
application/octet-stream
E:\apache-tomcat-7.0.82\work\Catalina\localhost\struts2\upload_ca4933df_aa32_4fc4_bbd5_d5d887c68972_00000007.tmp
nio1.png
image/png
E:\apache-tomcat-7.0.82\work\Catalina\localhost\struts2\upload_ca4933df_aa32_4fc4_bbd5_d5d887c68972_00000008.tmp
容杰龙.docx
application/vnd.openxmlformats-officedocument.wordprocessingml.document

<?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>
    <!-- 配置限制文件上传大小为1000k -->
    <constant name="struts.multipart.maxSize" value="10240000"></constant>
    <package name="default" namespace="/" extends="struts-default" >
        
        <global-results>
            <!-- struts在文件上传失败的时候，会返回input的错误视图，在这里配置对应的页面！ -->
            <result name="input">/input.jsp</result>
            <result name="error">/error.jsp</result>
        </global-results>
        <global-exception-mappings>
            <exception-mapping result="error" exception="java.lang.Exception"></exception-mapping>
        </global-exception-mappings>
        <action name="one" class="com.rong.web.action.MyAction">
            <result>/one.jsp</result>
        </action>
    </package>
</struts>

限制允许上传的文件类型以及文件扩展名：

<?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>
    <!-- 配置限制文件上传大小为1000k -->
    <constant name="struts.multipart.maxSize" value="10240000"></constant>
    <package name="default" namespace="/" extends="struts-default" >
        
        <global-results>
            <!-- struts在文件上传失败的时候，会返回input的错误视图，在这里配置对应的页面！ -->
            <result name="input">/input.jsp</result>
            <result name="error">/error.jsp</result>
        </global-results>
        <global-exception-mappings>
            <exception-mapping result="error" exception="java.lang.Exception"></exception-mapping>
        </global-exception-mappings>
        <action name="one" class="com.rong.web.action.MyAction">
            <!-- Action里设置默认拦截器栈 -->
            <interceptor-ref name="defaultStack">
                <!-- 限制允许上传的文件类型 -->
                <param name="fileUpload.allowedTypes">image/png,text/plain</param>
                <!-- 限制上传文件的扩展名 -->
                <param name="fileUpload.allowedExtensions">txt,png,docx</param>
                <!-- 以上两个参数同时配置取交集 -->
            </interceptor-ref>
            <result>/one.jsp</result>
        </action>
        
    </package>
</struts>

如果出现异常，上传失败，却无法弹出jsp页面，可在Tomcat服务器的server.xml文件中修改：

<Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443" URIEncoding="UTF-8" maxSwallowSize="-1"/>

2.文件下载

<?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>
    <package name="default" namespace="/" extends="struts-default" >
        <action name="download" class="com.rong.web.action.MyAction">
            <!-- 下载操作,name可以随意，但需要与返回值对应。type类型唯一。 -->
            <result name="down" type="stream">
                <!-- 文件的类型，指定为任意二进制类型，可以标识任何文件 -->
                <param name="contentType">application/octet-stream</param>
                <!-- 对应的是Action类中返回流的属性！对应getFileStream()方法 -->
                <param name="inputName">fileStream</param>
                <!-- 指定浏览器显示的文件名，对应action类中的返回文件名的属性！需要url编码，对应getDownFile()方法 -->
                <param name="contentDisposition">attachment;filename=${downFile}</param>
                <!-- 读取缓冲区大小 -->
                <param name="bufferSize">1024</param>
            </result>
        </action>
    </package>
</struts>

 1 package com.rong.web.action;
 2 
 3 import java.io.File;
 4 import java.io.FileInputStream;
 5 import java.io.FileNotFoundException;
 6 import java.io.InputStream;
 7 import java.io.UnsupportedEncodingException;
 8 import java.net.URLEncoder;
 9 
10 import com.opensymphony.xwork2.ActionSupport;
11 
12 public class MyAction extends ActionSupport {
13     private static final long serialVersionUID = -351587239525292420L;
14     private String filePath;
15     public String getFilePath() {
16         return filePath;
17     }
18     public void setFilePath(String filePath) {
19         this.filePath = filePath;
20     }
21     @Override
22     public String execute() throws Exception {
23         //实际开发中，用户只要传文件路径即可实现下载，这里固定路径。
24         filePath="C:/2017.11.17-广州市部份培训公司名单.docx";
25         return "down";
26     }
27     //返回流<param name="inputName">fileStream</param>
28     public InputStream getFileStream() throws FileNotFoundException{
29         return new FileInputStream(filePath);
30     }
31     //<param name="contentDisposition">attachment;filename=${downFile}</param>
32     public String getDownFile() throws UnsupportedEncodingException{
33         File file=new File(filePath);
34         String name = file.getName();
35         return URLEncoder.encode(name, "UTF-8");
36     }
37 }

posted @ 2018-01-02 20:03 57容杰龙阅读(294) 评论(0) 编辑收藏举报

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