在java中如何把下拉列表框中的值获取？jsp页面跳转到servlet里面，在servlet里获值！
3个回答
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<body>
<form action="/day05/servlet/RequestDemo2" method="post">
用户名：<input type="text" name="username"><br/>
密码：<input type="password" name="password"><br/>
性别：
<input type="radio" name="gender" value="male">男
<input type="radio" name="gender" value="female">女<br/>
所在地：
<select name="city">
<option value="beijing">北京</option>
<option value="shanghai">上海</option>
<option value="changsha">长沙</option>
</select>
<br/>
爱好：
<input type="checkbox" name="likes">唱歌
<input type="checkbox" name="likes">跳舞
<input type="checkbox" name="likes">篮球<br/>
备注：
<textarea rows="6" cols="60" name="description"></textarea><br/>
大头照：<input type="file" name="image"><br/>
<input type="hidden" name="id" value="12345">
<input type="submit" value="提交">
</form>
public class RequestDemo2 extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String value = request.getParameter("username");
if(value!=null&&!value.trim().equals("")){
System.out.println(value);
}
System.out.println("------------------------------");
Enumeration<String> e = request.getParameterNames();
while(e.hasMoreElements()){
String name = e.nextElement();
value = request.getParameter(name);
System.out.println(name + "="+value);
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
}
<form action="/day05/servlet/RequestDemo2" method="post">
用户名：<input type="text" name="username"><br/>
密码：<input type="password" name="password"><br/>
性别：
<input type="radio" name="gender" value="male">男
<input type="radio" name="gender" value="female">女<br/>
所在地：
<select name="city">
<option value="beijing">北京</option>
<option value="shanghai">上海</option>
<option value="changsha">长沙</option>
</select>
<br/>
爱好：
<input type="checkbox" name="likes">唱歌
<input type="checkbox" name="likes">跳舞
<input type="checkbox" name="likes">篮球<br/>
备注：
<textarea rows="6" cols="60" name="description"></textarea><br/>
大头照：<input type="file" name="image"><br/>
<input type="hidden" name="id" value="12345">
<input type="submit" value="提交">
</form>
public class RequestDemo2 extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String value = request.getParameter("username");
if(value!=null&&!value.trim().equals("")){
System.out.println(value);
}
System.out.println("------------------------------");
Enumeration<String> e = request.getParameterNames();
while(e.hasMoreElements()){
String name = e.nextElement();
value = request.getParameter(name);
System.out.println(name + "="+value);
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
}
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<body>
<form action="/day05/servlet/RequestDemo2" method="post">
用户名：<input type="text" name="username"><br/>
密码：<input type="password" name="password"><br/>
性别：
<input type="radio" name="gender" value="male">男
<input type="radio" name="gender" value="female">女<br/>
所在地：
<select name="city">
<option value="beijing">北京</option>
<option value="shanghai">上海</option>
<option value="changsha">长沙</option>
</select>
<br/>
爱好：
<input type="checkbox" name="likes">唱歌
<input type="checkbox" name="likes">跳舞
<input type="checkbox" name="likes">篮球<br/>
备注：
<textarea rows="6" cols="60" name="description"></textarea><br/>
大头照：<input type="file" name="image"><br/>
<input type="hidden" name="id" value="12345">
<input type="submit" value="提交">
</form>
public class RequestDemo2 extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String value = request.getParameter("username");
if(value!=null&&!value.trim().equals("")){
System.out.println(value);
}
System.out.println("------------------------------");
Enumeration<String> e = request.getParameterNames();
while(e.hasMoreElements()){
String name = e.nextElement();
value = request.getParameter(name);
System.out.println(name + "="+value);
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
}
<form action="/day05/servlet/RequestDemo2" method="post">
用户名：<input type="text" name="username"><br/>
密码：<input type="password" name="password"><br/>
性别：
<input type="radio" name="gender" value="male">男
<input type="radio" name="gender" value="female">女<br/>
所在地：
<select name="city">
<option value="beijing">北京</option>
<option value="shanghai">上海</option>
<option value="changsha">长沙</option>
</select>
<br/>
爱好：
<input type="checkbox" name="likes">唱歌
<input type="checkbox" name="likes">跳舞
<input type="checkbox" name="likes">篮球<br/>
备注：
<textarea rows="6" cols="60" name="description"></textarea><br/>
大头照：<input type="file" name="image"><br/>
<input type="hidden" name="id" value="12345">
<input type="submit" value="提交">
</form>
public class RequestDemo2 extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String value = request.getParameter("username");
if(value!=null&&!value.trim().equals("")){
System.out.println(value);
}
System.out.println("------------------------------");
Enumeration<String> e = request.getParameterNames();
while(e.hasMoreElements()){
String name = e.nextElement();
value = request.getParameter(name);
System.out.println(name + "="+value);
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
}
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如果jsp页面是form提交的话，直接在后台 request.GerParameter()获取便可以啊！获取<select name="name_a" >name便可以啊。 不行蛮
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