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
package com.wisely.web;

public class DemoObj {


private Long id;


private String name;

<span style="color: #a71d5d;" class="pl-k">public</span> <span style="color: #795da3;" class="pl-en">DemoObj</span>() {

    <span style="color: #ed6a43;" class="pl-v">super</span>();

}

<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>) {

    <span style="color: #ed6a43;" class="pl-v">super</span>();

    <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;

    <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;

}

<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>() {

    <span style="color: #a71d5d;" class="pl-k">return</span> id;

}

<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>) {

    <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;

}

<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>() {

    <span style="color: #a71d5d;" class="pl-k">return</span> name;

}

<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>) {

    <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;

}




}

  • 控制器 TestController
package com.wisely.web;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;


import org.springframework.web.bind.annotation.PathVariable;


import org.springframework.web.bind.annotation.RequestMapping;


import org.springframework.web.bind.annotation.RequestParam;


import org.springframework.web.bind.annotation.ResponseBody;

@Controller //声明为控制器bean


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


public class TestController {


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


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


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


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


public  String root(HttpServletRequest request){


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


}

<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>)

<span style="color: #969896;" class="pl-c">//映射地址为http://localhost:8080/testSpringMVC/test/add</span>

<span style="color: #a71d5d;" class="pl-k">@ResponseBody</span>

<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>){

    <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>;

}

<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>)

<span style="color: #969896;" class="pl-c">//映射地址为http://.../test/remove(或http://.../test/delete)</span>

<span style="color: #a71d5d;" class="pl-k">@ResponseBody</span>

<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>){

    <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>;

}

<span style="color: #969896;" class="pl-c">//获取request参数</span>

<span style="color: #969896;" class="pl-c">//获取路径参数</span>

<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>)

<span style="color: #969896;" class="pl-c">//映射路径http://.../test/get?id=123</span>

<span style="color: #a71d5d;" class="pl-k">@ResponseBody</span>

<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>){

    <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);

    <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>;

}

<span style="color: #969896;" class="pl-c">//获取路径参数</span>

<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>)

<span style="color: #969896;" class="pl-c">//映射路径http://.../test/123</span>

<span style="color: #a71d5d;" class="pl-k">@ResponseBody</span>

<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>){

    <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);

    <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>;

}

<span style="color: #969896;" class="pl-c">//获得对象</span>

<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>)

<span style="color: #969896;" class="pl-c">//映射路径http://.../test/pass?id=123&amp;name=wyf</span>

<span style="color: #a71d5d;" class="pl-k">@ResponseBody</span>

<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>){

    <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());

    <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>;

}




}

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