02点睛Spring MVC 4.1-@RequestMapping

转发地址：https://www.iteye.com/blog/wiselyman-2213907

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;

    public DemoObj() {

        super();

    }

    public DemoObj(Long id, String name) {

        super();

        this.id = id;

        this.name = name;

    }

    public Long getId() {

        return id;

    }

    public void setId(Long id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = 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";

    }

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

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

    @ResponseBody

    public   String add(HttpServletRequest request){

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

    }

    @RequestMapping(value = {"/remove","/delete"},produces = "text/plain;charset=UTF-8")

    //映射地址为http://.../test/remove(或http://.../test/delete)

    @ResponseBody

    public   String remove(HttpServletRequest request){

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

    }

    //获取request参数

    //获取路径参数

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

    //映射路径http://.../test/get?id=123

    @ResponseBody

    public String passRequestParam(@RequestParam Long id,HttpServletRequest request){

        System.out.println("id为"+id);

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

    }

    //获取路径参数

    @RequestMapping(value = "/{id}",produces = "text/plain;charset=UTF-8")

    //映射路径http://.../test/123

    @ResponseBody

    public String passPathVariable(@PathVariable Long id,HttpServletRequest request){

        System.out.println("id为"+id);

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

    }

    //获得对象

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

    //映射路径http://.../test/pass?id=123&name=wyf

    @ResponseBody

    public String passObj(DemoObj obj,HttpServletRequest request){

        System.out.println("对象的id和名称分别为为："+obj.getId()+"/"+obj.getName());

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

    }

}

巴特西

02点睛Spring MVC 4.1-@RequestMapping

2.1 @RequestMapping

2.2 演示

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