當(dāng)瀏覽器發(fā)送了一次請求到服務(wù)器時，servlet容器會根據(jù)請求的url-pattern找到對應(yīng)的Servlet類，執(zhí)行對應(yīng)的doPost或doGet方法，再將響應(yīng)信息返回給瀏覽器，這種情況下，一個Servlet類，一對配置信息。多個業(yè)務(wù), 就需要多個Servert類, 效率太低下, 實際上我們是可以通過一個Servlet類實現(xiàn)多個業(yè)務(wù)請求的
這里通過類的反射機制及invoke方法來實現(xiàn)一Servlet類多請求的操作實例
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.Method;
@WebServlet(name = "ServletDoMore", value = "/domore/*")
public class ServletDoMore extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 獲取請求的URI地址信息
String url = request.getRequestURI();
// 截取其中的方法名
String methodName = url.substring(url.lastIndexOf("/")+1);
System.out.println(methodName);
// 使用反射機制獲取在本類中聲明了的方法
Method method = null;
try {
method = getClass().getDeclaredMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
method.invoke(this, request, response);
} catch (Exception e) {
System.out.println("方法不存在");
}
}
private void add(HttpServletRequest request, HttpServletResponse respons)throws ServletException, IOException{
System.out.println("添加表單");
}
private void addsave(HttpServletRequest request, HttpServletResponse respons)throws ServletException, IOException{
System.out.println("信息保存");
}
private void update(HttpServletRequest request, HttpServletResponse respons)throws ServletException, IOException{
System.out.println("修改表單");
}
private void updatesave(HttpServletRequest request, HttpServletResponse respons)throws ServletException, IOException{
System.out.println("修改保存");
}
private void index(HttpServletRequest request, HttpServletResponse respons)throws ServletException, IOException{
System.out.println("信息列表");
}
}請求不同的地址如下就會訪問對應(yīng)的方法
http://localhost/domore/add http://localhost/domore/addsave http://localhost/domore/update http://localhost/domore/updatesave http://localhost/domore/index
