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jsp的request.getParameter獲取不到表單參數

可能原因:

1: form表單中的控件沒有定義name屬性

2: form表單中的控件被設置成disabled

3: form表單的enctype="multipart/form-data"是一種用于上傳文件的表單

解決方法:

對于第三種情況我們直接request.getParameter來取參數值是取不到的

我們可以借用apache的上傳組件來解決

用到jar包commons-fileupload-1.1.1.jar

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.FileItemFactory;

import org.apache.commons.fileupload.FileUploadException;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

/**

*獲取各種類型表單的表單參數

*@paramrequest HttpServletRequest請求對像

* @paramparamName 參數名

*@return

*@throwsFileUploadException

publicstatic String getParameterValue(HttpServletRequest request,String paramName) throws FileUploadException{

boolean isMultipart = ServletFileUpload.~~isMultipartContent~~(request);

if(isMultipart==true){

FileItemFactory factory = new DiskFileItemFactory();

ServletFileUpload upload = new ServletFileUpload(factory);

List fileItemList = upload.parseRequest(request);

if(fileItemList!=null){

for(Iterator itr=fileItemList.iterator();itr.hasNext();){

FileItem fileItem = (FileItem)itr.next();

if(fileItem.getFieldName().equalsIgnoreCase(paramName)){

return new String(fileItem.getString().getBytes("ISO8859-1"))//中文轉碼

}

}else{

return new String(request.getParameter(paramName).getBytes("ISO8859-1"))//中文轉碼

}

return"";

}

posted on 2007-12-14 19:07 JGAO編程隨筆閱讀(14905) 評論(6) 編輯收藏

我測試了下,沒發現你說的問題啊,不懂你是怎么調用出現的問題

//Test.java
package com.sf.test;

import java.io.UnsupportedEncodingException;
import java.util.Iterator;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.FileItemFactory;

import org.apache.commons.fileupload.FileUploadException;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class Test {
/**
*
* 獲取各種類型表單的表單參數
*
* @paramrequest HttpServletRequest請求對像
*
* @paramparamName 參數名
*
* @return
* @throws UnsupportedEncodingException
*
* @throwsFileUploadException
*
*/

public static String getParameterValue(HttpServletRequest request,
String paramName) throws FileUploadException,
UnsupportedEncodingException {
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
if (isMultipart == true) {
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
List fileItemList = upload.parseRequest(request);
if (fileItemList != null) {
for (Iterator itr = fileItemList.iterator(); itr.hasNext();) {
FileItem fileItem = (FileItem) itr.next();
if (fileItem.getFieldName().equalsIgnoreCase(paramName)) {
return new String(fileItem.getString().getBytes(
"ISO8859-1"));// 中文轉碼
}
}
}else{
return "";
}
} else if(request.getParameter(paramName)!=null){
return new String(request.getParameter(paramName).getBytes(
"ISO8859-1"));// 中文轉碼
}else{
return "";
}
return "";
}

}

TestJsp.jsp
<%@ page contentType="text/html;charset=GB2312"%>
<html>
<body leftmargin="0" topmargin="0" marginwidth="0" marginheight="0" >
<form action="TestJspAction.jsp" enctype="multipart/form-data">
<table width="100%" border="0" cellpadding="0" cellspacing="0">
<input type="text" id="userName" name="userName">
<input type="submit" value="submit">
</table>
</form>
</body>
</html>

//TestJspAction.jsp
<%@ page contentType="text/html;charset=GB2312"%>
<%@ page import="com.sf.test.Test"%>
<%
String userName = Test.getParameterValue(request,"userName");
out.print(userName);
%>

回復更多評論

# re: jsp的request.getParameter獲取不到表單參數 2008-06-03 20:35 zhoudb

我試了，但是怎么還是獲取不了哦，快瘋了哦啊！回復更多評論

# re: jsp的request.getParameter獲取不到表單參數 2008-09-18 11:50 逸誠

確實用enctype="multipart/form-data"上傳文件時表單的參數得不到。回復更多評論

# re: jsp的request.getParameter獲取不到表單參數[未登錄] 2011-05-14 11:32 ok

@逸誠
肯定阿，你用二進制這種方式，用request肯定得不到，你要用另一種reqeust，具體我記不清了，你查一下回復更多評論

# re: jsp的request.getParameter獲取不到表單參數 2011-07-28 16:01 ``

那我在jsp頁面中怎么得到表單參數的值回復更多評論

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# re: jsp的request.getParameter獲取不到表單參數 2008-05-16 01:35 howardhe

# re: jsp的request.getParameter獲取不到表單參數[未登錄] 2008-05-19 23:16 jgao

# re: jsp的request.getParameter獲取不到表單參數 2008-06-03 20:35 zhoudb

# re: jsp的request.getParameter獲取不到表單參數 2008-09-18 11:50 逸誠

# re: jsp的request.getParameter獲取不到表單參數[未登錄] 2011-05-14 11:32 ok

# re: jsp的request.getParameter獲取不到表單參數 2011-07-28 16:01 ``

jsp的request.getParameter獲取不到表單參數

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