2.1 @RequestMapping

  • @RequestMapping是SpringMVC的核心注解,负责访问的url与调用方法之间的映射;
  • @RequestMapping可以放在类和方法上;
    • @RequestMapping的属性produces属性控制response返回的形式;
    • @RequestMapping的属性method属性控制接受访问的类型,不写不做限制,本例为演示方便全部都是get请求;
  • @ResponseBody(放在方法上或者返回值类型前)将方法参数放置在web body的body中(返回的不是页面而是你所控制的字符)
  • @RequestBody(放在方法参数前)将方法参数放置在web request的body中(如提交一个json对象作为参数-在03点睛Spring MVC 4.1-REST演示)
  • produces的内容是指定返回的媒体类型让浏览器识别
    • 如返回text/plain的话,chrome浏览器下network显示Response的Content-Type:text/plain;
    • 如返回application/json的话,chrome浏览器下network显示Response的application/json;
    • 因本节无页面,在03点睛Spring MVC 4.1-REST有只管的阐述和演示;
  • 这节使用@RequestMapping演示常用映射场景

2.2 演示

  • 传值对象
  1. package com.wisely.web;
  2.  
  3. public class DemoObj {

  4. private Long id;

  5. private String name;
  6. <span style="color: #a71d5d;" class="pl-k">public</span> <span style="color: #795da3;" class="pl-en">DemoObj</span>() {
  7.     <span style="color: #ed6a43;" class="pl-v">super</span>();
  8. }
  10. <span style="color: #a71d5d;" class="pl-k">public</span> <span style="color: #795da3;" class="pl-en">DemoObj</span>(<span style="color: #333333;" class="pl-smi">Long</span> <span style="color: #ed6a43;" class="pl-v">id</span>, <span style="color: #333333;" class="pl-smi">String</span> <span style="color: #ed6a43;" class="pl-v">name</span>) {
  11.     <span style="color: #ed6a43;" class="pl-v">super</span>();
  12.     <span style="color: #ed6a43;" class="pl-v">this</span><span style="color: #a71d5d;" class="pl-k">.</span>id <span style="color: #a71d5d;" class="pl-k">=</span> id;
  13.     <span style="color: #ed6a43;" class="pl-v">this</span><span style="color: #a71d5d;" class="pl-k">.</span>name <span style="color: #a71d5d;" class="pl-k">=</span> name;
  14. }
  15. <span style="color: #a71d5d;" class="pl-k">public</span> <span style="color: #333333;" class="pl-smi">Long</span> <span style="color: #795da3;" class="pl-en">getId</span>() {
  16.     <span style="color: #a71d5d;" class="pl-k">return</span> id;
  17. }
  18. <span style="color: #a71d5d;" class="pl-k">public</span> <span style="color: #a71d5d;" class="pl-k">void</span> <span style="color: #795da3;" class="pl-en">setId</span>(<span style="color: #333333;" class="pl-smi">Long</span> <span style="color: #ed6a43;" class="pl-v">id</span>) {
  19.     <span style="color: #ed6a43;" class="pl-v">this</span><span style="color: #a71d5d;" class="pl-k">.</span>id <span style="color: #a71d5d;" class="pl-k">=</span> id;
  20. }
  21. <span style="color: #a71d5d;" class="pl-k">public</span> <span style="color: #333333;" class="pl-smi">String</span> <span style="color: #795da3;" class="pl-en">getName</span>() {
  22.     <span style="color: #a71d5d;" class="pl-k">return</span> name;
  23. }
  24. <span style="color: #a71d5d;" class="pl-k">public</span> <span style="color: #a71d5d;" class="pl-k">void</span> <span style="color: #795da3;" class="pl-en">setName</span>(<span style="color: #333333;" class="pl-smi">String</span> <span style="color: #ed6a43;" class="pl-v">name</span>) {
  25.     <span style="color: #ed6a43;" class="pl-v">this</span><span style="color: #a71d5d;" class="pl-k">.</span>name <span style="color: #a71d5d;" class="pl-k">=</span> name;
  26. }
  27.  
  28. }

  • 控制器 TestController
  1. package com.wisely.web;
  2.  
  3. import javax.servlet.http.HttpServletRequest;
  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.RequestParam;

  9. import org.springframework.web.bind.annotation.ResponseBody;
  10.  
  11. @Controller //声明为控制器bean

  12. @RequestMapping("/test")// 根地址为http://localhost:8080/testSpringMVC/test

  13. public class TestController {

  14. //response媒体类型(MediaType)为text/plain,编码是utf-8

  15. @RequestMapping(produces = "text/plain;charset=UTF-8")

  16. //映射地址为http://localhost:8080/testSpringMVC/test

  17. @ResponseBody //此注解让返回值不是页面,也是将结果字符串直接返回

  18. public  String root(HttpServletRequest request){

  19. return "url:"+request.getRequestURL()+" 可以访问此方法";

  20. }
  21. <span style="color: #a71d5d;" class="pl-k">@RequestMapping</span>(<span style="color: #0086b3;" class="pl-c1">value</span> <span style="color: #a71d5d;" class="pl-k">=</span> <span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>/add<span class="pl-pds">"</span></span>,<span style="color: #0086b3;" class="pl-c1">produces</span> <span style="color: #a71d5d;" class="pl-k">=</span> <span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>text/plain;charset=UTF-8<span class="pl-pds">"</span></span>)
  22. <span style="color: #969896;" class="pl-c">//映射地址为http://localhost:8080/testSpringMVC/test/add</span>
  23. <span style="color: #a71d5d;" class="pl-k">@ResponseBody</span>
  24. <span style="color: #a71d5d;" class="pl-k">public</span>   <span style="color: #333333;" class="pl-smi">String</span> <span style="color: #795da3;" class="pl-en">add</span>(<span style="color: #333333;" class="pl-smi">HttpServletRequest</span> <span style="color: #ed6a43;" class="pl-v">request</span>){
  25.     <span style="color: #a71d5d;" class="pl-k">return</span> <span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>url:<span class="pl-pds">"</span></span><span style="color: #a71d5d;" class="pl-k">+</span>request<span style="color: #a71d5d;" class="pl-k">.</span>getRequestURL()<span style="color: #a71d5d;" class="pl-k">+</span><span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span> 可以访问此方法<span class="pl-pds">"</span></span>;
  26. }
  28. <span style="color: #a71d5d;" class="pl-k">@RequestMapping</span>(<span style="color: #0086b3;" class="pl-c1">value</span> <span style="color: #a71d5d;" class="pl-k">=</span> {<span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>/remove<span class="pl-pds">"</span></span>,<span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>/delete<span class="pl-pds">"</span></span>},<span style="color: #0086b3;" class="pl-c1">produces</span> <span style="color: #a71d5d;" class="pl-k">=</span> <span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>text/plain;charset=UTF-8<span class="pl-pds">"</span></span>)
  29. <span style="color: #969896;" class="pl-c">//映射地址为http://.../test/remove(或http://.../test/delete)</span>
  30. <span style="color: #a71d5d;" class="pl-k">@ResponseBody</span>
  31. <span style="color: #a71d5d;" class="pl-k">public</span>   <span style="color: #333333;" class="pl-smi">String</span> <span style="color: #795da3;" class="pl-en">remove</span>(<span style="color: #333333;" class="pl-smi">HttpServletRequest</span> <span style="color: #ed6a43;" class="pl-v">request</span>){
  32.     <span style="color: #a71d5d;" class="pl-k">return</span> <span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>url:<span class="pl-pds">"</span></span><span style="color: #a71d5d;" class="pl-k">+</span>request<span style="color: #a71d5d;" class="pl-k">.</span>getRequestURL()<span style="color: #a71d5d;" class="pl-k">+</span><span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span> 可以访问此方法<span class="pl-pds">"</span></span>;
  33. }
  35. <span style="color: #969896;" class="pl-c">//获取request参数</span>
  36. <span style="color: #969896;" class="pl-c">//获取路径参数</span>
  37. <span style="color: #a71d5d;" class="pl-k">@RequestMapping</span>(<span style="color: #0086b3;" class="pl-c1">value</span> <span style="color: #a71d5d;" class="pl-k">=</span> <span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>/get<span class="pl-pds">"</span></span>,<span style="color: #0086b3;" class="pl-c1">produces</span> <span style="color: #a71d5d;" class="pl-k">=</span> <span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>text/plain;charset=UTF-8<span class="pl-pds">"</span></span>)
  38. <span style="color: #969896;" class="pl-c">//映射路径http://.../test/get?id=123</span>
  39. <span style="color: #a71d5d;" class="pl-k">@ResponseBody</span>
  40. <span style="color: #a71d5d;" class="pl-k">public</span> <span style="color: #333333;" class="pl-smi">String</span> <span style="color: #795da3;" class="pl-en">passRequestParam</span>(<span style="color: #a71d5d;" class="pl-k">@RequestParam</span> <span style="color: #333333;" class="pl-smi">Long</span> <span style="color: #ed6a43;" class="pl-v">id</span>,<span style="color: #333333;" class="pl-smi">HttpServletRequest</span> <span style="color: #ed6a43;" class="pl-v">request</span>){
  41.     <span style="color: #333333;" class="pl-smi">System</span><span style="color: #a71d5d;" class="pl-k">.</span>out<span style="color: #a71d5d;" class="pl-k">.</span>println(<span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>id为<span class="pl-pds">"</span></span><span style="color: #a71d5d;" class="pl-k">+</span>id);
  42.     <span style="color: #a71d5d;" class="pl-k">return</span> <span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>url:<span class="pl-pds">"</span></span><span style="color: #a71d5d;" class="pl-k">+</span>request<span style="color: #a71d5d;" class="pl-k">.</span>getRequestURL()<span style="color: #a71d5d;" class="pl-k">+</span><span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span> 可以访问此方法<span class="pl-pds">"</span></span>;
  44. }
  46. <span style="color: #969896;" class="pl-c">//获取路径参数</span>
  47. <span style="color: #a71d5d;" class="pl-k">@RequestMapping</span>(<span style="color: #0086b3;" class="pl-c1">value</span> <span style="color: #a71d5d;" class="pl-k">=</span> <span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>/{id}<span class="pl-pds">"</span></span>,<span style="color: #0086b3;" class="pl-c1">produces</span> <span style="color: #a71d5d;" class="pl-k">=</span> <span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>text/plain;charset=UTF-8<span class="pl-pds">"</span></span>)
  48. <span style="color: #969896;" class="pl-c">//映射路径http://.../test/123</span>
  49. <span style="color: #a71d5d;" class="pl-k">@ResponseBody</span>
  50. <span style="color: #a71d5d;" class="pl-k">public</span> <span style="color: #333333;" class="pl-smi">String</span> <span style="color: #795da3;" class="pl-en">passPathVariable</span>(<span style="color: #a71d5d;" class="pl-k">@PathVariable</span> <span style="color: #333333;" class="pl-smi">Long</span> <span style="color: #ed6a43;" class="pl-v">id</span>,<span style="color: #333333;" class="pl-smi">HttpServletRequest</span> <span style="color: #ed6a43;" class="pl-v">request</span>){
  51.     <span style="color: #333333;" class="pl-smi">System</span><span style="color: #a71d5d;" class="pl-k">.</span>out<span style="color: #a71d5d;" class="pl-k">.</span>println(<span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>id为<span class="pl-pds">"</span></span><span style="color: #a71d5d;" class="pl-k">+</span>id);
  52.     <span style="color: #a71d5d;" class="pl-k">return</span> <span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>url:<span class="pl-pds">"</span></span><span style="color: #a71d5d;" class="pl-k">+</span>request<span style="color: #a71d5d;" class="pl-k">.</span>getRequestURL()<span style="color: #a71d5d;" class="pl-k">+</span><span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span> 可以访问此方法<span class="pl-pds">"</span></span>;
  54. }
  56. <span style="color: #969896;" class="pl-c">//获得对象</span>
  57. <span style="color: #a71d5d;" class="pl-k">@RequestMapping</span>(<span style="color: #0086b3;" class="pl-c1">value</span> <span style="color: #a71d5d;" class="pl-k">=</span> <span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>/pass<span class="pl-pds">"</span></span>,<span style="color: #0086b3;" class="pl-c1">produces</span> <span style="color: #a71d5d;" class="pl-k">=</span> <span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>text/plain;charset=UTF-8<span class="pl-pds">"</span></span>)
  58. <span style="color: #969896;" class="pl-c">//映射路径http://.../test/pass?id=123&amp;name=wyf</span>
  59. <span style="color: #a71d5d;" class="pl-k">@ResponseBody</span>
  60. <span style="color: #a71d5d;" class="pl-k">public</span> <span style="color: #333333;" class="pl-smi">String</span> <span style="color: #795da3;" class="pl-en">passObj</span>(<span style="color: #333333;" class="pl-smi">DemoObj</span> <span style="color: #ed6a43;" class="pl-v">obj</span>,<span style="color: #333333;" class="pl-smi">HttpServletRequest</span> <span style="color: #ed6a43;" class="pl-v">request</span>){
  61.     <span style="color: #333333;" class="pl-smi">System</span><span style="color: #a71d5d;" class="pl-k">.</span>out<span style="color: #a71d5d;" class="pl-k">.</span>println(<span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>对象的id和名称分别为为：<span class="pl-pds">"</span></span><span style="color: #a71d5d;" class="pl-k">+</span>obj<span style="color: #a71d5d;" class="pl-k">.</span>getId()<span style="color: #a71d5d;" class="pl-k">+</span><span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>/<span class="pl-pds">"</span></span><span style="color: #a71d5d;" class="pl-k">+</span>obj<span style="color: #a71d5d;" class="pl-k">.</span>getName());
  62.     <span style="color: #a71d5d;" class="pl-k">return</span> <span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span>url:<span class="pl-pds">"</span></span><span style="color: #a71d5d;" class="pl-k">+</span>request<span style="color: #a71d5d;" class="pl-k">.</span>getRequestURL()<span style="color: #a71d5d;" class="pl-k">+</span><span style="color: #183691;" class="pl-s"><span class="pl-pds">"</span> 可以访问此方法<span class="pl-pds">"</span></span>;
  64. }
  65.  
  66. }

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