jsp request.getParameterValues获取数组值代码示例

tt.jsp

<form action="tt2.jsp" method="POST">

    <select name="two" multiple="multiple">

        <option value="val1" selected="selected">Value 1</option>

        <option value="val2" selected="selected">Value 2</option>

        <option value="val3" selected="selected">Value 3</option>

        <option value="val4" selected="selected">Value 4</option>

        <option value="val5" selected="selected">Value 5</option>

     </select>

     <input type="checkbox" name="three" value="chk1">Check 1<br/>

     <input type="checkbox" name="three" value="chk2">Check 2<br/>

     <input type="checkbox" name="three" value="chk3">Check 3<br/>

     <input type="checkbox" name="three" value="chk4">Check 4<br/>

     <input type="checkbox" name="three" value="chk5">Check 5<br/>

     

     <input type="submit" value="Submit">

</form>

tt2.jsp

<%

String[] selected = request.getParameterValues("two");

if(selected != null){

    for(int i=0; i<selected.length; i++){

        out.write("<p>" + selected[i] + "<p>");

    }

}else{

    out.write("<p> No value selected <p>");

}



String[] checked = request.getParameterValues("three");

if(checked != null){

    for(int i=0; i<checked.length; i++){

        out.write("<p>" + checked[i] + "<p>");

    }

}else{

    out.write("<p> No value checked <p>");

}

%>

注意: 下拉多选框如果没有选中状态,rquest.getParameterValues是取不到值的~!