先寫個type="file"，看看Action抓到的情形
upload.jsp
<form action="upload!upload.action" method="post" enctype="multipart/form-data"> <input type="file" name="uploadFile" /><br /> <input type="submit" /> </form>
struts.xml，因為action沒有result，待會會出錯，但目前只要看控制台的訊息就好
<constant name="struts.enable.DynamicMethodInvocation" value="true" /> <constant name="struts.custom.i18n.resources" value="Message" /> <constant name="struts.devMode" value="true" /> <package name="basicstruts2" extends="struts-default" namespace="/struts2"> <action name="upload" class="action.UploadAction"></action> </package>
UploadAction.java，只要繼承ActinSupport
public class UploadAction extends ActionSupport {
private File uploadFile;
//setter即可
public String upload() {
System.out.println("uploadFile=" + uploadFile);
return null;
}
}
抓到的檔案副檔名為tmp，而且控制台部分訊息出現「'uploadFileContentType' on 'class action.UploadAction」和「'uploadFileFileName' on 'class action.UploadAction」的訊息，表示要增加這兩個屬性，所以Action最後的結果要改成如下的方式：
public class UploadAction extends ActionSupport {
private File uploadFile;
private String uploadFileContentType;
private String uploadFileFileName;
//三個屬性都給setter即可
public String upload() {
System.out.println("uploadFile=" + uploadFile);
System.out.println("uploadFileContentType=" + uploadFileContentType);
System.out.println("uploadFileFileName=" + uploadFileFileName);
return null;
}
}
這裡也有說明
知道這三個屬性的關係後，重新再寫一次
upload.jsp
<%@ page isELIgnored="false"%>
${uploadMsg}
<form action="upload!upload.action" method="post" enctype="multipart/form-data">
<input type="file" name="uploadFile" /><br />
<input type="submit" />
</form>
struts.xml，constant可以在src下建立一個struts.properties，也是一樣，目前這隻saveDir還沒有作用
<constant name="struts.enable.DynamicMethodInvocation" value="true" /> <constant name="struts.custom.i18n.resources" value="Message" /> <constant name="struts.devMode" value="true" /> <constant name="struts.multipart.saveDir" value="D:\testStruts2" /> <constant name="struts.multipart.maxSize" value="2097152" /> <package name="basicstruts2" extends="struts-default" namespace="/struts2"> <action name="upload" class="action.UploadAction"> <result name="success">/struts2/upload.jsp</result> </action> </package>struts2-core-2.x.x.jar\org.apache.strtus2\default.properties可以找到constant的所有資訊
2097152單位是bit，除兩次1024就是2MB
UploadAction.java
private File uploadFile;
private String uploadFileContentType;
private String uploadFileFileName;
//三個屬性都給setter即可
public String upload() {
HttpServletRequest request = ServletActionContext.getRequest();
//可以到「tomcat目錄\conf\web.xml」可看到很多xxx/xxx
List<String> list = Arrays.asList(new String[] { "image/jpeg",
"image/bmp", "image/tiff" });
if (list.contains(this.uploadFileContentType)) {
ServletContext context = ServletActionContext.getServletContext();
StringBuffer path = new StringBuffer();
// 取個資料夾名稱放上傳的檔案
path.append(context.getRealPath("/uploadPlace"));
// 用唯一值命名主檔名
path.append(File.separator + UUID.randomUUID() + ".");
// 取原本的副檔名
path.append(this.uploadFileFileName
.substring(this.uploadFileFileName.lastIndexOf(".") + 1));
FileControl.saveFile(this.uploadFile, path.toString());
request.setAttribute("uploadMsg", "上傳成功！");
} else {
request.setAttribute("uploadMsg", "上傳非圖片格式！");
}
return SUCCESS;
}
FileControl.java，裡面只有兩個靜態方法
public static boolean saveFile(File file, String path) {
File outFile = new File(path);
if (!outFile.getParentFile().exists()) {
outFile.getParentFile().mkdirs();
}
InputStream input = null;
OutputStream output = null;
try {
input = new FileInputStream(file);
output = new FileOutputStream(outFile);
byte[] data = new byte[1024];
int temp = 0;
while ((temp = input.read(data)) != -1) {
output.write(data, 0, temp);
}
input.close();
output.close();
return true;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}
public static boolean deleteFile(String path) {
File file = new File(path);
if (file.exists()) {
file.delete();
return true;
}
return false;
}
這個class就隨個人發揮了
以上雖然完成了功能，但是是屬於自己寫的苦功，所以stuts.xml的saveDir(儲存路徑)沒有效果，當然路徑也可以用Action裡的ServletActionContext.getServletContext().getRealPath("")取得檔案內容，然後進一步取得路徑
※用struts2的攔截器來達成上傳的功能
upload.jsp${fieldErrors},<br />
${fieldErrors['uploadFile']},<br />
${fieldErrors['uploadFile'][0]}<br />
<form action="upload!upload.action" method="post" enctype="multipart/form-data">
<input type="file" name="uploadFile" /><br />
<input type="submit" />
</form>
struts.xml，saveDir是暫存目錄，不加會在control有警告「Unable to find 'struts.multipart.saveDir' property setting. Defaulting to javax.servlet.context.tempdir」，但不影響上傳功能，而這個資料夾，上傳完成後，我也沒看到有什麼檔案在裡面
<constant name="struts.enable.DynamicMethodInvocation" value="true" /> <constant name="struts.custom.i18n.resources" value="Message" /> <constant name="struts.devMode" value="false" /> <constant name="struts.multipart.saveDir" value="D:/testStruts2" /> <package name="basicstruts2" extends="struts-default" namespace="/struts2"> <action name="upload" class="action.UploadAction"> <interceptor-ref name="fileUpload"> <param name="allowedTypes"> image/jpeg,image/bmp,image/tiff,image/png,image/gif </param> <param name="maximumSize">1048576</param> </interceptor-ref> <interceptor-ref name="basicStack"/> <result name="success">/struts2/upload.jsp</result> </action> </package>
UploadAction
private File uploadFile;
private String uploadFileContentType;
private String uploadFileFileName;
//都給setter即可
public String upload() {
ServletContext context = ServletActionContext.getServletContext();
StringBuffer path = new StringBuffer();
path.append(context.getRealPath("/uploadPlace"));
path.append(File.separator + this.uploadFileFileName);
System.out.println("path=" + path);
FileControl.saveFile(this.uploadFile, path.toString());
return SUCCESS;
}
Message.properties，顯示錯誤訊息用，不加也有預設的錯誤訊息
struts.messages.error.uploading=aaa struts.messages.error.file.too.large=bbb struts.messages.error.content.type.not.allowed=ccc struts.messages.error.file.extension.not.allowed=ddd
※多檔案上傳
以上個檔案為例，其實只要變成陣列的型式就可以了upload.jsp
<form action="upload!upload.action" method="post" enctype="multipart/form-data">
<input type="file" name="uploadFile" />${fieldErrors['uploadFile'][0]}<br />
<input type="file" name="uploadFile" />${fieldErrors['uploadFile'][1]}<br />
<input type="file" name="uploadFile" />${fieldErrors['uploadFile'][2]}<br />
<input type="submit" />
</form>
UploadAction.java
private File[] uploadFile;
private String[] uploadFileContentType;
private String[] uploadFileFileName;
//都給setter即可
public String upload() {
ServletContext context = ServletActionContext.getServletContext();
for (int i = 0; i < uploadFile.length; i++) {
StringBuffer path = new StringBuffer();
path.append(context.getRealPath("/uploadPlace"));
path.append(File.separator + this.uploadFileFileName[i]);
System.out.println("path=" + path);
FileControl.saveFile(this.uploadFile[i], path.toString());
}
return SUCCESS;
}
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