在JSP中声明函数？

您需要将其包含在<％中！％>如下：

<%!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：

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

要么

<%= getQuarter(17) %>