如何在jsp中设置默认单选按钮比较数据库值

Question

做了很多研究，但找不到有效的解决方案。这是我的问题。 我有一个名为 branchlist 的单选按钮列表，我正在从数据库中获取一个名为 branch 的值。现在我希望将单选按钮设置为选中，其值等于分支的值。这是我的代码：

<%
                ArrayList<String> branchlist = new ArrayList<String>();
                branchlist.add(0,"Computer Engineering");
                branchlist.add(1,"Information Technology");
                branchlist.add(2,"Electronic & Telecom");
                branchlist.add(3,"Instrumentation Engineering");
                branchlist.add(4,"Mechanical Engineering ");
                branchlist.add(5,"Civil Engineering");

                for(int i=0;i<branchlist.size();i++){
                    //System.out.println(branchlist.get(i)+"="+branch);
                    if(branchlist.equals(branch)){%>  <--- branch is the string value I am fetching from database.
                        <input  type="radio" name="branch" value="<%=branchlist.get(i)%>" checked="checked" ><%=branchlist.get(i) %><br>
                    <% }else {%>
                    <input type="radio" name="branch" value="<%=branchlist.get(i)%>" ><%=branchlist.get(i) %><br>

                <%}

                    }%>

Answer 1

这个怎么样：

<%
                ArrayList<String> branchlist = new ArrayList<String>();
                branchlist.add(0,"Computer Engineering");
                branchlist.add(1,"Information Technology");
                branchlist.add(2,"Electronic & Telecom");
                branchlist.add(3,"Instrumentation Engineering");
                branchlist.add(4,"Mechanical Engineering ");
                branchlist.add(5,"Civil Engineering");

                for(int i=0;i<branchlist.size();i++){
                    //System.out.println(branchlist.get(i)+"="+branch);
                    if(branchlist.get(i).toString().equals(branch)){%> 
                        <input  type="radio" name="branch" value="<%=branchlist.get(i)%>" checked="checked" ><%=branchlist.get(i) %><br>
                    <% }else {%>
                    <input type="radio" name="branch" value="<%=branchlist.get(i)%>" ><%=branchlist.get(i) %><br>

                <%}

                    }%>