RequestMapping org.springframework.web.bind.annotation.RequestMapping Annotation for mapping web requests onto specific handler classes and/or handler methods. Provides a consistent style between Servlet and Portlet environments, with the semantics adapting to the concrete environment. |
1、一個Action中，有多個業務方法
通過模塊根路徑 + 功能子路徑 = 訪問模塊下子功能的路徑
package com.rk.action;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
@RequestMapping(value="/user")
public class UserAction {
@RequestMapping(value="/add")
public String add(Model model) throws Exception{
model.addAttribute("message", "添加用戶");
return "/success.jsp";
}
@RequestMapping(value="/find")
public String find(Model model) throws Exception{
model.addAttribute("message", "查找用戶");
return "/success.jsp";
}
}增加用戶：http://127.0.0.1:8080/springmvc02/user/add.action
查詢用戶：http://127.0.0.1:8080/springmvc02/user/find.action
2、在業務控制方法中寫入普通變量收集參數
爲UserAction下add方法添加參數
@Controller
@RequestMapping(value="/user")
public class UserAction {
@RequestMapping(value="/add")
public String add(Model model, int id,String name, Double sal) throws Exception{
System.out.println(id + " - " + name + " - " + sal);
model.addAttribute("message", "添加用戶");
return "/success.jsp";
}
@RequestMapping(value="/find")
public String find(Model model) throws Exception{
model.addAttribute("message", "查找用戶");
return "/success.jsp";
}
}訪問如下地址：
http://127.0.0.1:8080/springmvc02/user/add.action?id=1&name=Tomcat&sal=8000
服務器控制檯會輸出：
1 - Tomcat - 8000.0
如果不添加參數直接訪問/user/add.action,則會報錯
http://127.0.0.1:8080/springmvc02/user/add.action
後臺錯誤信息如下：
Optional int parameter 'id' is not present but cannot be translated into a null value due to being declared as a primitive type. Consider declaring it as object wrapper for the corresponding primitive type.
稍做修改，將int類型修改爲Integer
@RequestMapping(value="/add")
public String add(Model model, Integer id,String name, Double sal) throws Exception{
System.out.println(id + " - " + name + " - " + sal);
model.addAttribute("message", "添加用戶");
return "/success.jsp";
}再次訪問
http://127.0.0.1:8080/springmvc02/user/add.action
控制檯輸出：
null - null - null
3、限定業務方法的GET或POST請求方式
可以在業務控制方法前，指明該業務控制方法只能接收GET或POST的請求
//@RequestMapping(value="/add",method={RequestMethod.POST})
@RequestMapping(value="/add",method=RequestMethod.POST)
public String add(Model model, Integer id,String name, Double sal) throws Exception{
System.out.println(id + " - " + name + " - " + sal);
model.addAttribute("message", "添加用戶");
return "/success.jsp";
}如果不書寫method=RequestMethod.POST的話，GET和POST請求都支持
