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spring boot学习(3) SpringBoot 之MVC 支持

第一节：@RequestMapping 配置url 映射

第二节：@Controller 处理http 请求

转发到一个页面，以前是转发到jsp页面，现在使用freemarker；

在pom.xml页面右键，spring-edit starters ，添加freemarker支持：spring-boot-starter-freemarker

pom.xml:

　　　　　　<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>

com.cy.controller.HelloWorldFreemarkerController.java:

package com.cy.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("/freemarker")
public class HelloWorldFreemarkerController {
    
    @RequestMapping("/say")
    public ModelAndView say(){
        ModelAndView mav=new ModelAndView();
        mav.addObject("message", "springboot你好！");
        mav.setViewName("helloWorld");
        return mav;
    }
    
}

freemarker模板是ftl为后缀的；src/main/resources/templates/helloWorld.ftl:

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
show: ${message}
</body>
</html>

浏览器http://localhost:8888/HelloWorld/freemarker/say：显示：show: springboot你好！

第三节：@RestController 处理ajax 请求

第四节：@PathVariable 获取url 参数

第五节：@RequestParam 获取请求参数

例子如下：

com.cy.controller.HelloWorldAjaxController.java:

package com.cy.controller;

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


@RestController
@RequestMapping("/ajax")
public class HelloWorldAjaxController {
    
    @RequestMapping("/hello")
    public String say(){
        return "{'message1':'SpringBoot你好','message2','Spring你好2'}";
    }
}

com.cy.controller.BlogController.java:

package com.cy.controller;

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.servlet.ModelAndView;

@Controller
@RequestMapping("/blog")
public class BlogController {
    
    @RequestMapping("/{id}")
    public ModelAndView show(@PathVariable("id") Integer id){
        ModelAndView mav=new ModelAndView();
        mav.addObject("id", id);
        mav.setViewName("blog");
        return mav;
    }
    
    @RequestMapping("/query")
    public ModelAndView query(@RequestParam(value="q",required=false) String q){
        ModelAndView mav=new ModelAndView();
        mav.addObject("q", q);
        mav.setViewName("query");
        return mav;
    }
    
}

webapp/index.html:

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script src="resources/jquery/jquery.min.js"></script>
<script type="text/javascript">
    
    function show(){
        $.post("ajax/hello",{},function(result){
            alert(result);
        });
    }
    
</script>
</head>
<body>
<button onclick="show()">点击</button>
<a href="/HelloWorld/blog/21">博客</a>
<a href="/HelloWorld/blog/query?q=123456">搜索</a>
</body>
</html>

src/main/resoureces/templates/blog.ftl:

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
博客id:${id}
</body>
</html>

View Code

src/main/resources/templates/query.ftl:

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
q: ${q}
</body>
</html>

View Code

测试：

浏览器：http://localhost:8888/HelloWorld/index.html

点击按钮：alert： {'message1':'SpringBoot你好','message2','Spring你好2'}

点击博客链接：转发页面，显示博客id:21

点击搜索，到页面http://localhost:8888/HelloWorld/blog/query?q=123456，显示q: 123456

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原文地址：https://www.cnblogs.com/tenWood/p/8641778.html