4, Spring MVC Basic Configuration

1, Spring MVC
　　difference between MVC and three-tier architecture:
　　MVC: Model View + + + the Controller data model view controller +
　　three-tier architecture: Controller + Service + Dao presentation layer + + application layer data access layer
2, commonly used annotation
　　@Controller : indicates that the class is a Spring MVC in the controller, is declared as a Bean Spring's, Dispatcher Servlet automatically scans comment this annotated classes, and
　　　　map Web requests to comment on the method @RequestMapping
　　@RequestMapping: used to map Web requests (access path and methods) to the processing classes and methods; annotations will inherit annotation on the class path path method; support the Servlet
　　　　request and Response as parameters, also supports request and Response media type configuration
　　@ requestBody: request parameters in the request to allow the body rather than directly to the rear link address, the notes placed in front of the parameter
　　@ResponseBody: support return values in the body instead of returning a response page; request in Ajax, this annotation can return data instead of the page; the annotation can be
　　　　placed on the front return value or method
　　@Pa thVariable: receive path parameters, placed in front of this annotation parameters
　　@RestController: @Controller composition and function @ResponseBody
3, other
　　@RequestMapping request type if not specified, it defaults to get
　　The default format native Ajax: text / Plain
　　Jquery Ajax default format (Map) + Form POST form submission format: application / x-www-form -urlencoded
　　character stream format Ajax (Map): application / json (use JSON.stringify (data ) converting json json string object)
　　file upload: multipart / form-Data
. 4, example

 1 import javax.servlet.http.HttpServletRequest;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.web.bind.annotation.PathVariable;
 5 import org.springframework.web.bind.annotation.RequestMapping;
 6 import org.springframework.web.bind.annotation.RequestMethod;
 7 import org.springframework.web.bind.annotation.ResponseBody;
 8 
 9 import com.ning.StudentRequestVO;
10 
11 // @RequestMapping("/stu")指定映射此类的路径为/stu或/stu/xxx
12 @Controller
13@RequestMapping ( "/ STU" )
 14  public  class StudentController {
 15      
16      // HTTP: // localhost : 8080 / spring4x / STU
 . 17      // must return the value specified by the form @ResponseBody 
18 is      @RequestMapping (Produces = "text / Plain ; charset = UTF-. 8 ", Method = RequestMethod.GET)
 . 19      public @ResponseBody String index (the HttpServletRequest Request) {
 20 is          return " URL: "+ Request.getRequestURI ();
 21 is      }
 22 is      
23 is      // HTTP: // localhost : 8080 / spring4x / STU / paathvar / Hello
 24      // reception path parameter is not specified the default request type to get
25     @RequestMapping(value = "/paathvar/{str}", produces = "text/plain;charset=UTF-8")
26     public @ResponseBody String stuPathVariable(@PathVariable String str,
27             HttpServletRequest request) {
28         return "url:" + request.getRequestURI() + "; str=" + str;
29     }
30     
31     //http://localhost:8080/spring4x/stu/param/?str=hello
32     //如果参数不是str，比如改为strdd，则str为null，输出为：url:/spring4x/stu/param/; str=null
33     @RequestMapping(value = "/param", produces = "text/plain;charset=UTF-8", method = RequestMethod.GET)
34     public @ResponseBody String stuRequestParamNormal(String str, HttpServletRequest request) {
35         return "url:" + request.getRequestURI() + "; str=" + str;
36     }
37     
38     //http://localhost:8080/spring4x/stu/obj/?id=11&name=helloword
39     //没有传递值的参数则为null
40     @RequestMapping(value = "/obj", produces = "application/json;charset=UTF-8", method = RequestMethod.GET)
41     public @ResponseBody String stuRequestParamObj(StudentRequestVO obj,
42             HttpServletRequest request) {
43         return "url:" + request.getRequestURI() + "; StudentRequestVO id=" + obj.getId() + ";name="
44                 + obj.getName() + ";mail=" + obj.getMail();
45     }
46     
47     //http://localhost:8080/spring4x/stu/url01
48     //http://localhost:8080/spring4x/stu/url02
49     @RequestMapping(value = {"/url01",
50             "/url02"}, produces = "text/plain;charset=UTF-8", method = RequestMethod.GET)
51     public @ResponseBody String stuMultip(HttpServletRequest request) {
52         return "url:" + request.getRequestURI();
53     }
54     
55     //http://localhost:8080/spring4x/stu/getjson
56     @RequestMapping(value = "/getjson", produces = "application/json;charset=UTF-8", method = RequestMethod.GET)
57     public @ResponseBody StudentRequestVO stuGetJson(HttpServletRequest request) {
58         StudentRequestVO stuObj = new StudentRequestVO();
59         stuObj.setId(11);
60         stuObj.setName("helloword");
61         return stuObj;
62     }
63     
64     //http://localhost:8080/spring4x/stu/getxml
65     //返回的数据格式为xml
66     @RequestMapping(value = "/getxml", produces = "application/xml;charset=UTF-8", method = RequestMethod.GET)
67     public @ResponseBody StudentRequestVO stuGetXml(HttpServletRequest request) {
68         StudentRequestVO stuObj = new StudentRequestVO();
69         stuObj.setId(11);
70         stuObj.setName("helloword");
71         return stuObj;
72     }
73 }