Servlet optimization

Some optimized packaging

In order to be able to handle different requests , We have to be in service Method to judge , Then write different business processes , This can be achieved , But every one of them Servlet Classes will have similar code , In response to this question , Is there any strategy that can be optimized ?

package jgd;import javax.servlet.*;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import java.io.IOException;public class ServletDemo5 implements Servlet {    public void init(ServletConfig servletConfig) throws ServletException {    }    public ServletConfig getServletConfig() {        return null;    }    public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {//  Depending on the way the request is made , Carry out separate treatment //  Get request method //  First convert to http Logic under the agreement         HttpServletRequest request = (HttpServletRequest) servletRequest;// Get the method         String method = request.getMethod();//  Judge         if ("GET".equals(method)) {// get Processing logic of mode         } else if ("POST".equals(method)) {// post Processing logic of mode         }    }    public String getServletInfo() {        return null;    }    public void destroy() {    }}

Like this code up here , I don't want to write logical judgments every time I write , This is a piece of repeated code . I don't want to write every time . There is not much logic processing here , If a lot of words , How should we behave ？ If we need to deal with it like this every time , We should make encapsulated calls .

Now we define a class by ourselves

package jgd;import javax.servlet.*;import javax.servlet.http.HttpServletRequest;import java.io.IOException;public class MyHttpServlet implements Servlet {    public void init(ServletConfig servletConfig) throws ServletException {    }    public ServletConfig getServletConfig() {        return null;    }    public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {//  Depending on the way the request is made , Carry out separate treatment //  Get request method //  First convert to http Logic under the agreement         HttpServletRequest request = (HttpServletRequest) servletRequest;// Get the method         String method = request.getMethod();//  Judge         if ("GET".equals(method)) {            doGet(servletRequest, servletResponse);// get Processing logic of mode         } else if ("POST".equals(method)) {// post Processing logic of mode             doPost(servletRequest, servletResponse);        }    }    protected void doPost(ServletRequest servletRequest, ServletResponse servletResponse) {    }    protected void doGet(ServletRequest servletRequest, ServletResponse servletResponse) {    }    public String getServletInfo() {        return null;    }    public void destroy() {    }}

We define the method , The parameters are well arranged . You can let subsequent classes inherit to this class . Then realize the call of unified functions .

Later, it is simplified a lot , This is also the benefit of inheritance . It is also a function package .

package jgd;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.annotation.WebServlet;@WebServlet("/demo6")public class ServletDemo6 extends MyHttpServlet {    @Override    protected void doGet(ServletRequest servletRequest, ServletResponse servletResponse) {// super.doGet(servletRequest, servletResponse);        System.out.println("get...");    }    @Override    protected void doPost(ServletRequest servletRequest, ServletResponse servletResponse) {// super.doPost(servletRequest, servletResponse);        System.out.println("post..");    }}