HttpServletRequest 中的 JSP 参数名称
背景
使用 Eclipse Helios、Apache Tomcat、JSP 和 JBoss RichFaces 的
。输入参数的编码如下:
<h:inputHidden name="system_REPORT_RESOURCE" value="city" />
<h:inputHidden name="system_REPORT_FILENAME" value="city" />
<h:inputHidden name="report_REPORT_TITLE" value="City Listing" />
... and others ...
问题
以下代码显示键的值:
@SuppressWarnings( "unchecked" )
protected void setInputParameters() {
HttpServletRequest request = getServletRequest();
Enumeration<String> keys = request.getParameterNames();
while( keys.hasMoreElements() ) {
String key = keys.nextElement();
for( String value : request.getParameterValues( key ) ) {
System.out.println( "KEY: " + key + " VALUE: " + value );
}
}
}
框架修改键的名称:
KEY: j_id2:report_city VALUE: ab
KEY: j_id2:system_REPORT_RESOURCE VALUE: city
KEY: j_id2:j_id11 VALUE: Report
KEY: j_id2:report_REPORT_TITLE VALUE: City Listing
KEY: j_id2:report_int_max_longitude VALUE:
KEY: j_id2:report_int_min_latitude VALUE:
KEY: javax.faces.ViewState VALUE: j_id28
KEY: j_id2:system_REPORT_FILENAME VALUE: city
KEY: j_id2 VALUE: j_id2
更新
更改
标记以包含 id= "form"
属性的结果是:
KEY: form:system_REPORT_FILENAME VALUE: city
KEY: form VALUE: form
KEY: form:report_city VALUE: ab
KEY: form:report_int_max_longitude VALUE:
KEY: form:report_REPORT_TITLE VALUE: Canadian City List
KEY: form:system_REPORT_RESOURCE VALUE: city
KEY: form:report_int_min_latitude VALUE:
KEY: form:j_id10 VALUE: Report
KEY: javax.faces.ViewState VALUE: j_id1
这更好,但仍然不理想。
更新 2
代码需要一般性地解析输入表单参数名称。到目前为止,以下代码可以删除前缀(但感觉很黑客):
/**
* Appends the list of HTTP request parameters to the internal parameter
* map of user input values. Some frameworks prepend the name of the HTML
* FORM before the name of the input. This method detects the colon and
* removes the FORM NAME, if present. This means that input parameter
* names assigned by developers should not contain a colon in the name.
* (Technically, it is possible, but to avoid potential confusion it
* should be avoided.)
*/
protected void setInputParameters() {
HttpServletRequest request = getServletRequest();
Iterator<String> keys = getExternalContext().getRequestParameterNames();
Parameters p = getParameters();
while( keys.hasNext() ) {
String key = keys.next();
for( String value : request.getParameterValues( key ) ) {
int i = key.indexOf( ':' );
if( i >= 0 ) {
key = key.substring( i + 1 );
}
p.put( key, value );
}
}
}
问题
什么 API 调用返回不带 j_id2
前缀的参数名称?
删除 j_id2
前缀(和可选的完整冒号)可能会引入依赖于框架的代码。
谢谢你!
Background
Using Eclipse Helios, Apache Tomcat, JSPs, and JBoss RichFaces.
Input parameters are coded as follows:
<h:inputHidden name="system_REPORT_RESOURCE" value="city" />
<h:inputHidden name="system_REPORT_FILENAME" value="city" />
<h:inputHidden name="report_REPORT_TITLE" value="City Listing" />
... and others ...
Problem
The following code shows the keys' values:
@SuppressWarnings( "unchecked" )
protected void setInputParameters() {
HttpServletRequest request = getServletRequest();
Enumeration<String> keys = request.getParameterNames();
while( keys.hasMoreElements() ) {
String key = keys.nextElement();
for( String value : request.getParameterValues( key ) ) {
System.out.println( "KEY: " + key + " VALUE: " + value );
}
}
}
The framework modifies the keys' names:
KEY: j_id2:report_city VALUE: ab
KEY: j_id2:system_REPORT_RESOURCE VALUE: city
KEY: j_id2:j_id11 VALUE: Report
KEY: j_id2:report_REPORT_TITLE VALUE: City Listing
KEY: j_id2:report_int_max_longitude VALUE:
KEY: j_id2:report_int_min_latitude VALUE:
KEY: javax.faces.ViewState VALUE: j_id28
KEY: j_id2:system_REPORT_FILENAME VALUE: city
KEY: j_id2 VALUE: j_id2
Update
Changing the <h:form>
tag to include an id="form"
attribute results in:
KEY: form:system_REPORT_FILENAME VALUE: city
KEY: form VALUE: form
KEY: form:report_city VALUE: ab
KEY: form:report_int_max_longitude VALUE:
KEY: form:report_REPORT_TITLE VALUE: Canadian City List
KEY: form:system_REPORT_RESOURCE VALUE: city
KEY: form:report_int_min_latitude VALUE:
KEY: form:j_id10 VALUE: Report
KEY: javax.faces.ViewState VALUE: j_id1
This is better, but still not ideal.
Update 2
The code needs to parse input form parameter names generically. So far, the following code works to remove the prefix (but it feels hackish):
/**
* Appends the list of HTTP request parameters to the internal parameter
* map of user input values. Some frameworks prepend the name of the HTML
* FORM before the name of the input. This method detects the colon and
* removes the FORM NAME, if present. This means that input parameter
* names assigned by developers should not contain a colon in the name.
* (Technically, it is possible, but to avoid potential confusion it
* should be avoided.)
*/
protected void setInputParameters() {
HttpServletRequest request = getServletRequest();
Iterator<String> keys = getExternalContext().getRequestParameterNames();
Parameters p = getParameters();
while( keys.hasNext() ) {
String key = keys.next();
for( String value : request.getParameterValues( key ) ) {
int i = key.indexOf( ':' );
if( i >= 0 ) {
key = key.substring( i + 1 );
}
p.put( key, value );
}
}
}
Question
What API call returns the parameter names without the j_id2
prefix?
Removing the j_id2
prefix (and optional full colon) would likely introduce framework-dependent code.
Thank you!
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评论(2)
我认为没有API可以做到这一点,j_id2:XXX是实际的请求参数名称。
I don't think there is API to do that, j_id2:XXX is the actual request parameter name.
您可以使用标准 HTML
标记。它工作得很好。事实上,我刚刚发布了我自己问题的答案,我发现使用它是最好的主意。请参阅此处:将参数传递给 PrimeFaces 星级评定组件?
You could use a standard HTML
<input>
tag. It works just fine. In fact, I just posted an answer to my own question where I found using it was the best idea. See it here: Passing parameters to PrimeFaces Star Rating component?