在JSP中声明函数？ [英] Declaring functions in JSP?

问题描述

我来自PHP世界，在php页面中声明一个函数非常简单。
我试图在JSP中做同样的事情：

I come from PHP world, where declaring a function in the middle of a php page is pretty simple. I tried to do the same in JSP:

public String getQuarter(int i){
String quarter;
switch(i){
    case 1: quarter = "Winter";
    break;

    case 2: quarter = "Spring";
    break;

    case 3: quarter = "Summer I";
    break;

    case 4: quarter = "Summer II";
    break;

    case 5: quarter = "Fall";
    break;

    default: quarter = "ERROR";
}

return quarter;
}

我收到以下错误：

I get the following error:

An error occurred at line: 20 in the jsp file: /headers.jsp
Illegal modifier for the variable getQuarter; only final is permitted return;

推荐答案

您需要在<％！ ％>，如下所示：

You need to enclose that in <%! %> as follows:

<%!

public String getQuarter(int i){
String quarter;
switch(i){
        case 1: quarter = "Winter";
        break;

        case 2: quarter = "Spring";
        break;

        case 3: quarter = "Summer I";
        break;

        case 4: quarter = "Summer II";
        break;

        case 5: quarter = "Fall";
        break;

        default: quarter = "ERROR";
}

return quarter;
}

%>

然后，您可以在脚本或表达式中调用该函数：

You can then invoke the function within scriptlets or expressions:

<%
     out.print(getQuarter(4));
%>

或

or

<%= getQuarter(17) %>

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