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Upload struts2 files (single files/multiple files)

Source: Internet
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<1> Brief description:

The struts2 File Upload is actually implemented through the interceptor, but the interceptor is defined as the default interceptor, so you do not need to manually configure it. <interceptor name = "fileupload" class = "org. apache. struts2.interceptor. fileuploadinterceptor "/>

<2> specify the size of the file to be uploaded by the user in two ways:

1) by default, Struts. multipart. maxsize = 2097152 in the default. properties file is specified2097152That is, 2 m, calculated by 2097152/(1024*1024) = 2 m

Then we can change its default value. As long as we create a new struts. properties file under the src directory, specify the upload size as follows:


Only 10 MB can be uploaded at a time. No matter how many files are uploaded at a time, the sum is calculated.


2) specify in the Struts. xml file,


In fact, name corresponds to the key of Struts. properties, and value corresponds to the value.

Note:Struts. PropertiesSet the file upload size.Struts. xmlSet the file upload size.Struts. PropertiesThe priority is higherStruts. xml. Generally, you can specify the upload size at one place. We recommend that youStruts. Properties


<3> single file upload of struts2

1. fileupload. jsp

<% @ Page Language = "Java" Import = "Java. util. * "pageencoding =" UTF-8 "%> <br/> <% <br/> string Path = request. getcontextpath (); <br/> string basepath = request. getscheme () + ": //" + request. getservername () + ":" + request. getserverport () + path + "/"; <br/>%> </P> <p> <! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en"> <br/> <HTML> <br/> <pead> <br/> <base href = "<% = basepath %>"> </P> <p> <title> my JSP 'fileupload. JSP 'starting page </title> </P> <p> <meta http-equiv = "Pragma" content = "no-Cache"> <br/> <meta http- equiv = "cache-control" content = "no-Cache"> <br/> <meta http-equiv = "expires" content = "0"> <br/> <Meta HTTP-equiv = "keywords" content = "keyword1, keyword2, keywo Rd3 "> <br/> <meta http-equiv =" Description "content =" this is my page "> <br/> <! -- <Br/> <LINK rel = "stylesheet" type = "text/CSS" href = "styles.css"> <br/> --> </P> <p> </ head> </P> <p> <body> <br/> <! -- Enctype is application/X-WWW-form-urlencoded by default --> <br/> <form action = "fileupload2" enctype = "multipart/form-Data" method = "Post"> </P> <p> User Name: <input type = "text" name = "usename"> <br/> upload a file: <input type = "file" name = "file1"> <br/> </P> <p> <input type = "Submit" value = "Submit"/> </ p> <p> </form> </P> <p> </body> <br/> </ptml> <br/>
2. process the uploaded fileupload. Java

Package COM. struts2.fileupload; </P> <p> Import Java. io. file; <br/> Import Java. io. fileinputstream; <br/> Import Java. io. fileoutputstream; <br/> Import Java. io. inputstream; <br/> Import Java. io. outputstream; </P> <p> Import Org. apache. struts2.servletactioncontext; </P> <p> Import COM. opensymphony. xwork2.actionsupport; </P> <p>/** <br/> * upload a single file <br/> * @ author administrator <br/> * two files are uploaded, <br/> * beginning First, save the uploaded file to default. struts. multipart. <br/> * empty by default <br/> * saved in Tomcat 6.0 \ work \ Catalina \ localhost \ struts2 directory. TMP extension file <br/> * if you want. multipart. if savedir specifies a directory, you can create a struts file under the SRC folder. properties, <br/> * overwrite default. some key values of properties <br/> * are stored in the specified directory <br/> */<br/> public class fileupload extends actionsupport {</P> <p> private string usename; <Br/> private file file1; // reference of the uploaded file, pointing to the temporary file in the temporary directory <br/> private string file1filename; // name of the uploaded file, fixed filename syntax <br/> private string file1contenttype; // File Upload type, fixed contenttype syntax </P> <p> Public String getusename () {<br/> return usename; <br/>}< br/> Public void setusename (string usename) {<br/> This. usename = usename; <br/>}< br/> Public file getfile1 () {<br/> return file1; <br/>}< br/> Public Vo Id setfile1 (File file1) {<br/> This. file1 = file1; <br/>}< br/> Public String getfile1filename () {<br/> return file1filename; <br/>}< br/> Public void setfile1filename (string file1filename) {<br/> This. file1filename = file1filename; <br/>}< br/> Public String getfile1contenttype () {<br/> return file1contenttype; <br/>}< br/> Public void setfile1contenttype (string file1contenttype) {<br/> This. file1con Tenttype = file1contenttype; <br/>}</P> <p> @ override <br/> Public String execute () throws exception {<br/> // obtain the file storage path <br/> string Path = servletactioncontext. getrequest (). getrealpath ("/upload"); <br/> // output stream <br/> outputstream OS = new fileoutputstream (new file (path, file1filename )); <br/> // input stream <br/> inputstream is = new fileinputstream (file1); </P> <p> byte [] Buf = new byte [1024]; <br/> int length = 0; </P> <P> while (-1! = (Length = is. read (BUF) <br/>{< br/> OS. write (BUF, 0, length); <br/>}< br/> is. close (); <br/> OS. close (); </P> <p> return success; <br/>}</P> <p >}< br/>
3. The final display result page, filedemo. jsp

<% @ Page Language = "Java" Import = "Java. util. * "pageencoding =" UTF-8 "%> <br/> <% @ taglib prefix =" S "uri ="/Struts-tags "%> </P> <p> <% <br/> string Path = request. getcontextpath (); <br/> string basepath = request. getscheme () + ": //" + request. getservername () + ":" + request. getserverport () + path + "/"; <br/>%> </P> <p> <! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en"> <br/> <HTML> <br/> <pead> <br/> <base href = "<% = basepath %>"> </P> <p> <title> my JSP 'filedemo. JSP 'starting page </title> </P> <p> <meta http-equiv = "Pragma" content = "no-Cache"> <br/> <meta http- equiv = "cache-control" content = "no-Cache"> <br/> <meta http-equiv = "expires" content = "0"> <br/> <Meta HTTP-equiv = "keywords" content = "keyword1, keyword2, keyword 3 "> <br/> <meta http-equiv =" Description "content =" this is my page "> <br/> <! -- <Br/> <LINK rel = "stylesheet" type = "text/CSS" href = "styles.css"> <br/> --> </P> <p> </ head> </P> <p> <body> <br/> upload successful: <br/> usename: <s: property value = "usename"/> <br/> file: <s: property value = "file1filename"/> <br/> contenttype: <s: property value = "file1contenttype"/> </P> <p> </body> <br/> </ptml> <br/>

<4> upload as many files as struts2

1. fileupload. jsp

<% @ Page Language = "Java" Import = "Java. util. * "pageencoding =" UTF-8 "%> <br/> <% <br/> string Path = request. getcontextpath (); <br/> string basepath = request. getscheme () + ": //" + request. getservername () + ":" + request. getserverport () + path + "/"; <br/>%> </P> <p> <! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en"> <br/> <HTML> <br/> <pead> <br/> <base href = "<% = basepath %>"> </P> <p> <title> my JSP 'fileupload. JSP 'starting page </title> </P> <p> <meta http-equiv = "Pragma" content = "no-Cache"> <br/> <meta http- equiv = "cache-control" content = "no-Cache"> <br/> <meta http-equiv = "expires" content = "0"> <br/> <Meta HTTP-equiv = "keywords" content = "keyword1, keyword2, keywo Rd3 "> <br/> <meta http-equiv =" Description "content =" this is my page "> <br/> <! -- <Br/> <LINK rel = "stylesheet" type = "text/CSS" href = "styles.css"> <br/> --> </P> <p> </ head> </P> <p> <body> <br/> <! -- Enctype is application/X-WWW-form-urlencoded by default --> <br/> <form action = "fileupload2" enctype = "multipart/form-Data" method = "Post"> </P> <p> User Name: <input type = "text" name = "usename"> <br/> upload a file: <input type = "file" name = "file1"> <br/> upload a file: <input type = "file" name = "file1"> <br/> <! -- Both names are file1 --> <br/> <input type = "Submit" value = "Submit"/> </P> <p> </form> </P> <p> </body> <br/> </ptml>
The attribute values of the names of the two uploaded files are the same and can be easily processed in the background.

2. fileupload2.java

Multi-File Upload using collection

Package COM. struts2.fileupload; </P> <p> Import Java. io. file; <br/> Import Java. io. fileinputstream; <br/> Import Java. io. fileoutputstream; <br/> Import Java. io. inputstream; <br/> Import Java. io. outputstream; <br/> Import Java. util. list; </P> <p> Import Org. apache. struts2.servletactioncontext; </P> <p> Import COM. opensymphony. xwork2.actionsupport; </P> <p>/** <br/> * Multifile upload, using a set method <br/> * @ author administrator <br/> * <Br/> */</P> <p> public class fileupload2 extends actionsupport {</P> <p> private string usename; <br/> private list <File> file1; <br/> private list <string> file1filename; <br/> private list <string> file1contenttype; </P> <p> Public String getusename () {<br/> return usename; <br/>}< br/> Public void setusename (string usename) {<br/> This. usename = usename; <br/>}< br/> public list <File> getfile1 () {<br /> Return file1; <br/>}< br/> Public void setfile1 (list <File> file1) {<br/> This. file1 = file1; <br/>}< br/> public list <string> getfile1filename () {<br/> return file1filename; <br/>}< br/> Public void setfile1filename (list <string> file1filename) {<br/> This. file1filename = file1filename; <br/>}< br/> public list <string> getfile1contenttype () {<br/> return file1contenttype; <br/>}< br/> Public void set File1contenttype (list <string> file1contenttype) {<br/> This. file1contenttype = file1contenttype; <br/>}</P> <p> @ override <br/> Public String execute () throws exception {</P> <p> // obtain the file storage path <br/> string Path = servletactioncontext. getrequest (). getrealpath ("/upload"); </P> <p> for (INT I = 0; I <file1.size (); I ++) <br/>{< br/> outputstream OS = new fileoutputstream (new file (path, file1filename. get (I); </P> <P> inputstream is = new fileinputstream (file1.get (I); </P> <p> byte [] Buf = new byte [1024]; <br/> int length = 0; </P> <p> while (-1! = (Length = is. read (BUF) <br/>{< br/> OS. write (BUF, 0, length); <br/>}</P> <p> is. close (); <br/> OS. close (); </P> <p >}</P> <p> return success; <br/>}</P> <p >}< br/>
3. filedemo. jsp

<% @ Page Language = "Java" Import = "Java. util. * "pageencoding =" UTF-8 "%> <br/> <% @ taglib prefix =" S "uri ="/Struts-tags "%> </P> <p> <% <br/> string Path = request. getcontextpath (); <br/> string basepath = request. getscheme () + ": //" + request. getservername () + ":" + request. getserverport () + path + "/"; <br/>%> </P> <p> <! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en"> <br/> <HTML> <br/> <pead> <br/> <base href = "<% = basepath %>"> </P> <p> <title> my JSP 'filedemo2. JSP 'starting page </title> </P> <p> <meta http-equiv = "Pragma" content = "no-Cache"> <br/> <meta http- equiv = "cache-control" content = "no-Cache"> <br/> <meta http-equiv = "expires" content = "0"> <br/> <Meta HTTP-equiv = "keywords" content = "keyword1, keyword2, keywor D3 "> <br/> <meta http-equiv =" Description "content =" this is my page "> <br/> <! -- <Br/> <LINK rel = "stylesheet" type = "text/CSS" href = "styles.css"> <br/> --> </P> <p> </ head> </P> <p> <body> <br/> upload successful: <br/> usename: <s: property value = "usename"/> <br/> <! -- Traversal value --> <br/> <s: iterator value = "file1filename" id = "F"> <! -- ID is an object. Currently, it is a string set that can be named at will --> <br/> file: <s: property value = "# F"/> <br/> <! -- The method <s: property value = "# F. touppercase () "/> --> <br/> </s: iterator> </P> <p> </body> <br/> </ptml> <br/>
The method of traversing the set can be implemented using the iterator label provided by struts2.

<S: iterator value = "file1filename" id = "F"> <! -- ID is an object. Currently, it is a string set that can be named at will -->
File: <s: property value = "# F"/> <br/>
<! -- You can also call the method <s: property value = "# F. touppercase ()"/> -->

The touppercase () string is converted to uppercase letters.
</S: iterator>


Download link:

1) Servlet File Upload ----
Click Open Link

2) download struts2
Click Open Link




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