Spring MVC--@RequestMapping

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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