Question

怎么在jsp中转换int类型

我是用String chushu = request.getParameter("chushu"); String beichushu = request.getParameter("beichushu"); Integer he = new Integer(chushu+beichushu);如果输入1+1但结果 出来的是1+1=11；我知道11是一个string类型的，当成字符串输出来了。没有转换为int类型！怎样才能转换为int类型输出来啊？让我输入1+1后 结果等于2高手请指教！

Answer 1

String chushu = request.getParameter("chushu");
String beichushu = request.getParameter("beichushu");
int he=Integer.parseInt(chushu)+Integer.parseInt(beichushu) ;
在程序中（非jsp页面）我们一般习惯用try ...catch包起来 因为怕chushu或beichushu有null;
所以程序中
String chushu = request.getParameter("chushu");
String beichushu = request.getParameter("beichushu");
try{
int he=Integer.parseInt(chushu)+Integer.parseInt(beichushu) ;
}catch(Exception e){
System.out.println(e.getMessage());
}

Answer 2

String chushu = request.getParameter("chushu");
int c = Integer.parseInt(chushu);

Answer 3

String chushu = request.getParameter("chushu");
int i = Integer.parseInt(chushu );