Java 查找是否在 servlet 内选中了复选框
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Find whether check boxes are checked inside a servlet
提问by Deepesh Shetty
I have several check box in a form I just wanna way to check whether they are checked or not .
我在一个表单中有几个复选框，我只是想检查它们是否被选中。
If checked i need to store their id in the database(that i can do it ) . But my question is how to determine whether are checked or not instead of checking for each check box on at a time . I need to check whether its checked or not inside a servlet.
如果选中，我需要将他们的 id 存储在数据库中（我可以做到）。但我的问题是如何确定是否选中，而不是一次检查每个复选框。我需要检查它是否在 servlet 内被检查。
This is my code
这是我的代码
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
Role Id<input type="text" name="roll_id"/><br>
Role Name<input type="text" name="roll_name"/><br>
Role Description<textarea name="roll_desc"></textarea><br>
<br>
<br>
Screen1<br>
tab1<br>
<input type="checkbox" name="s1_t1_view" value="s1_t1_view" >view<br>
<input type="checkbox" name="s1_t1_add" value="s1_t1_add" >add<br>
<input type="checkbox" name="s1_t1_edit" value="s1_t1_edit" >edit<br>
<input type="checkbox" name="s1_t1_delete" value="s1_t1_delete" >delete<br>
tab2<br>
<input type="checkbox" name="s1_t2_view" value="s1_t2_view" >view<br>
<input type="checkbox" name="s1_t2_add" value="s1_t2_add" >add<br>
<input type="checkbox" name="s1_t2_edit" value="s1_t2_edit" >edit<br>
<input type="checkbox" name="s1_t2_delete" value="s1_t2_delete" >delete<br>
Screen2<br>
tab1<br>
<input type="checkbox" name="s2_t1_view" value="s2_t1_view" >view<br>
<input type="checkbox" name="s2_t1_add" value="s2_t1_add" >add<br>
<input type="checkbox" name="s2_t1_edit" value="s2_t1_edit" >edit<br>
<input type="checkbox" name="s2_t1_delete" value="s2_t1_delete" >delete<br>
tab2<br>
<input type="checkbox" name="s2_t2_view" value="s2_t2_view" >view<br>
<input type="checkbox" name="s2_t2_add" value="s2_t2_add" >add<br>
<input type="checkbox" name="s2_t2_edit" value="s2_t2_edit" >edit<br>
<input type="checkbox" name="s2_t2_delete" value="s2_t2_delete" >delete<br>
<input type="submit" name="sumbit" text="submit">
</body>
</html>
But in my code I have several check boxes . I need to hardcode that for every check box . Is there way so that i put it in a loop and check for all check boxes ?
但在我的代码中，我有几个复选框。我需要对每个复选框进行硬编码。有没有办法让我把它放在一个循环中并检查所有复选框？
采纳答案by Xaltar
To be simple, you can use the nameattribute to get the data since you are using different name for each checkbox.
简单来说，您可以使用该name属性来获取数据，因为您为每个复选框使用了不同的名称。
In Servlet :
在 Servlet 中：
String[] s1_t1_view = request.getParameterValues("s1_t1_view");
String[] s1_t1_add = request.getParameterValues("s1_t1_add");
If you want to use group of checkbox to give the user a choice between multiple values, you will need to iterate over the group in the servlet. You can use this :
如果要使用复选框组让用户在多个值之间进行选择，则需要在 servlet 中迭代组。你可以使用这个：
In HTML : (same name = same group)
在 HTML 中：（同名 = 同组）
<input type = "checkbox" name = "s1_t1" value = "s1_t2_view" >View <br>
<input type = "checkbox" name = "s1_t1" value = "s1_t2_add" >Add <br>
<input type = "checkbox" name = "s1_t1" value = "s1_t2_edit" >Edit <br>
<input type = "checkbox" name = "s1_t1" value = "s1_t2_delete" >Delete<br>
In Servlet :
在 Servlet 中：
String[] results = request.getParameterValues("s1_t1");
for (int i = 0; i < results.length; i++) {
System.out.println(results[i]);
}
回答by PSR
You can use
您可以使用
String[] checked = request.getParameterValues("checkboxName");
and then check the checkedvalue
然后检查checked值
回答by MankitaP
For me this one worked.
对我来说，这个有效。
String[] selecttype=request.getParameterValues("selectType");
//selectType is the name of checkbox in jsp page.
This will return selected checkbox values.
这将返回选定的复选框值。
回答by Victor
Create hidden fields as
创建隐藏字段为
Now in your servlet as: String[] names = request.getParameterValues("checkbox");
现在在您的 servlet 中为： String[] names = request.getParameterValues("checkbox");
PrintWriter pw = new PrintWriter(new File("/Desktop/sticker.txt"));
for(int i=0; i < names.length; i++) {
if(i + 1 < names.length && names[i].equals(names[i+1])) {
pw.write(names[i] + ",true\n");
++i;
} else {
pw.write(names[i]+",false\n");
}
}
pw.close();
