如何多个请求运用一个servlet

墨蓝 2021-11-17 10:48 313阅读 0赞

方法一  jsp部分页面为 ：

<a href = "customerServlet?method=add">Add</a> 
 
<a href = "customerServlet?method=query">Query</a> 
 
<a href = "customerServlet?method=delete">Delete</a> 
 
<a href = "customerServlet?method=update">Update</a> 
 servlet 配置 ：

<servlet> 
<servlet-name>CustomerServlet1</servlet-name> 
<servlet-class>com.zyl.mvcapp.servlet.CustomerServlet</servlet-class> 
</servlet> 
<servlet-mapping> 
<servlet-name>CustomerServlet1</servlet-name> 
<url-pattern>/customerServlet</url-pattern> 
</servlet-mapping>

servlet部分代码：

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException \{  
doPost(request, response);  
\}  
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException \{  
String method = request.getParameter("method");  
switch (method) \{  
case "add":add(request,response);break;  
case "query":query(request,response);break;  
case "delete":delete(request,response);break;  
case "update":update(request,response);break;  
\}  
\}

private void update(HttpServletRequest request, HttpServletResponse response) \{  
System.out.println("update");  
  
\}  
private void delete(HttpServletRequest request, HttpServletResponse response) \{  
System.out.println("delete");  
  
\}  
  
private void query(HttpServletRequest request, HttpServletResponse response) \{  
System.out.println("query");  
  
\}  
private void add(HttpServletRequest request, HttpServletResponse response) \{  
System.out.println("add");  
\}  
private void edit(HttpServletRequest request, HttpServletResponse response) \{  
System.out.println("edit");  
\}

缺陷方法一：不安全在浏览器会显示操作的方法；且需要调加一种方法时需要大改

方法二  jsp部分页面为 ：

<a href = "add.do">Add</a> 
 
<a href = "query.do">Query</a> 
 
<a href = "delete.do">Delete</a> 
 
<a href = "update.do">Update</a> 
 
<a href = "edit.do">Edit</a>

servlet 配置 ：

servlet部分代码：

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException \{  
doPost(request, response);  
\}  
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException \{  
String servletPath = request.getServletPath();  
String methodname = servletPath.substring(1);  
methodname = methodname.substring(0,methodname.length()-3);  
Method method;  
try \{  
method = getClass().getDeclaredMethod(methodname, HttpServletRequest.class,HttpServletResponse.class);  
method.invoke(this, request,response);  
\} catch (Exception e) \{  
e.printStackTrace();  
\}  
\}

//更新方法

private void update(HttpServletRequest request, HttpServletResponse response) \{  
System.out.println("update");  
  
\}

//删除方法  
private void delete(HttpServletRequest request, HttpServletResponse response) \{  
System.out.println("delete");  
  
\}  
// 查询方法  
private void query(HttpServletRequest request, HttpServletResponse response) \{  
System.out.println("query");  
  
\}  
//添加方法  
private void add(HttpServletRequest request, HttpServletResponse response) \{  
System.out.println("add");  
\}

//编辑方法  
private void edit(HttpServletRequest request, HttpServletResponse response) \{  
System.out.println("edit");  
\}