SpringMVC的各种注解

  @RequestMapping

 

 

这个注解标注在方法名上,如

 1 /**
 2      * 拦截所有请求:
 3      * @RequestMapping(value="/*", method = {RequestMethod.GET})
 4      * http://localhost:8080/SpringMVCTag/helloworld/xd
 5      */
 6     //@AuthPassport
 7     @RequestMapping(value="/*", method = {RequestMethod.GET})
 8     public ModelAndView urlTest(){
 9         ModelAndView modelAndView = new ModelAndView();   
10         //跳转到 urltest.jsp或者其他后缀的页面,这个要看springmvc的配置文件里是怎么设置的,
11         modelAndView.setViewName("urltest");  
12         return modelAndView;
13     }

@RequestMapping(value="/*")

1 就是拦截所有请求

结合上面的一小段代码就是拦截:

类似于http://localhost:8080/SpringMVCTag/helloworld/我是任意字符,

http://localhost:8080/SpringMVCTag/helloworld/comaosdfjoa

这样的请求。

 2 拦截多个(多个)请求

例如:

 1 /**
 2      * 拦截多种请求
 3      *  如: @RequestMapping(value={"/index","/hello"})
 4      *  访问URL:http://localhost:8080/SpringMVCTag/helloworld/index
 5      * @return
 6      * @throws SQLException
 7      */
 8     //@AuthPassport
 9     @RequestMapping(value={"/index","/hello"})
10     public ModelAndView index() throws SQLException{
11         
12         //throw new SQLException("数据库异常。");
13         
14         ModelAndView modelAndView = new ModelAndView();  
15         //在jsp中可以通过 ${message} 的形式来获取绑定的值
16         modelAndView.addObject("message", "Hello World!");  
17         modelAndView.setViewName("index");  
18         return modelAndView;
19     }

3 @RequestMapping 注解结合 @PathVariable注解可以在控制器(也就是具体的方法)的入参里

获取到URL中的占位参数

例如:

 1 /**
 2      * @RequestMapping 结合 @PathVariable 注解可以获取URL中带占位的那个参数值,
 3      * 具体到这个例子中,在方法名中Integer id这个入参的值就是URL中的值,
 4      * 假如URL为:
 5      * http://localhost:8080/SpringMVCTag/helloworld/detail/yangdandan
 6      * 那么在跳转到的detail.jsp中通过
 7      * ${cxrr}的形式就可以获取到 yangdandan 这个字符串
 8      * @param id
 9      * @return
10      */
11     @RequestMapping(value="/detail/{thepara}", method = {RequestMethod.GET})
12     public ModelAndView getDetail(@PathVariable(value="thepara") String thepara){
13         
14         ModelAndView modelAndView = new ModelAndView();  
15         modelAndView.addObject("crxx", thepara);  
16         modelAndView.setViewName("detail");  
17         return modelAndView;
18     }

 

明天继续填坑。

 

项目所在位置如下图:

 

 

 

 

 

BaseController.java:

 1 package com.demo.web.controllers;
 2 
 3 import java.sql.SQLException;
 4 import javax.servlet.http.HttpServletRequest;
 5 import org.springframework.web.bind.annotation.ExceptionHandler;
 6 /**
 7  * 
 8  * @author Wei
 9  * @time  2017年4月20日 下午3:56:51
10  */
11 public abstract class BaseController {  
12 
13     @ExceptionHandler
14     public String exception(HttpServletRequest request, Exception e) {  
15           
16         request.setAttribute("exceptionMessage", e.getMessage());  
17           
18         // 根据不同的异常类型进行不同处理
19         if(e instanceof SQLException) 
20             return "testerror";   
21         else
22             return "error";  
23     }  
24     
25 }  

 

 

HelloWorldController.java
 1 package com.demo.web.controllers;
 2 
 3 import java.sql.SQLException;
 4 
 5 import org.springframework.stereotype.Controller;
 6 import org.springframework.web.bind.annotation.PathVariable;
 7 import org.springframework.web.bind.annotation.RequestMapping;
 8 import org.springframework.web.bind.annotation.RequestMethod;
 9 import org.springframework.web.servlet.ModelAndView;
10 
11 /**
12  * 
13  * @author Wei
14  * @time  2017年4月20日 下午4:56:43
15  */
16 @Controller
17 @RequestMapping(value = "/helloworld")
18 public class HelloWorldController extends BaseController {
19     /**
20      * 拦截所有请求:
21      * @RequestMapping(value="/*", method = {RequestMethod.GET})
22      * http://localhost:8080/SpringMVCTag/helloworld/xd
23      */
24     //@AuthPassport
25     @RequestMapping(value="/*", method = {RequestMethod.GET})
26     public ModelAndView urlTest(){
27         ModelAndView modelAndView = new ModelAndView();   
28         //跳转到 urltest.jsp或者其他后缀的页面,这个要看springmvc的配置文件里是怎么设置的,
29         modelAndView.setViewName("urltest");  
30         return modelAndView;
31     }
32     /**
33      * 拦截多种请求
34      *  如: @RequestMapping(value={"/index","/hello"})
35      *  访问URL:http://localhost:8080/SpringMVCTag/helloworld/index
36      * @return
37      * @throws SQLException
38      */
39     //@AuthPassport
40     @RequestMapping(value={"/index","/hello"})
41     public ModelAndView index() throws SQLException{
42         
43         //throw new SQLException("数据库异常。");
44         
45         ModelAndView modelAndView = new ModelAndView();  
46         //在jsp中可以通过 ${message} 的形式来获取绑定的值
47         modelAndView.addObject("message", "Hello World!");  
48         modelAndView.setViewName("index");  
49         return modelAndView;
50     }
51     /**
52      * @RequestMapping 结合 @PathVariable 注解可以获取URL中带占位的那个参数值,
53      * 具体到这个例子中,在方法名中Integer id这个入参的值就是URL中的值,
54      * 假如URL为:
55      * http://localhost:8080/SpringMVCTag/helloworld/detail/yangdandan
56      * 那么在跳转到的detail.jsp中通过
57      * ${cxrr}的形式就可以获取到 yangdandan 这个字符串
58      * @param id
59      * @return
60      */
61     @RequestMapping(value="/detail/{thepara}", method = {RequestMethod.GET})
62     public ModelAndView getDetail(@PathVariable(value="thepara") String thepara){
63         
64         ModelAndView modelAndView = new ModelAndView();  
65         modelAndView.addObject("crxx", thepara);  
66         modelAndView.setViewName("detail");  
67         return modelAndView;
68     }
69     
70     @RequestMapping(value="/reg/{name:\\w+}-{age:\\d+}", method = {RequestMethod.GET})
71     public ModelAndView regUrlTest(@PathVariable(value="name") String name, @PathVariable(value="age") Integer age){
72         
73         ModelAndView modelAndView = new ModelAndView();   
74         modelAndView.addObject("name", name); 
75         modelAndView.addObject("age", age); 
76         modelAndView.setViewName("regurltest");  
77         return modelAndView;
78     }
79     
80     @RequestMapping(value="/paramstest", params="example!=AAA", method = {RequestMethod.GET})
81     public ModelAndView paramsTest(){
82         
83         ModelAndView modelAndView = new ModelAndView();   
84         modelAndView.setViewName("paramstest");  
85         return modelAndView;
86     }
87     
88 }

 

posted @ 2017-04-20 17:36  Sunor  阅读(408)  评论(0编辑  收藏  举报