SpringBoot Web（SpringMVC）

入门工程：

package com.example.demo.controller;

import com.example.demo.entity.User;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

@RestController//返回json格式数据
public class DemoController {

    @RequestMapping(value="/demo/hello")
//http://localhost:8080/demo/hello
    public String hello() {
        return "hello";
    }

    @RequestMapping(value="/demo/json")
//http://localhost:8080/demo/json
    public Map<String, Object> json() {
        Map<String, Object> map = new HashMap<>();
        map.put("status", "OK");
        map.put("data", Arrays.asList("aaa","bbb","ddd"));

        return map;
    }

    @RequestMapping(value="/demo/auto")
//http://localhost:8080/demo/auto?id=1&no=2  自动复制到参数中
    public Map<String, Object> auto(Integer id, int no) {
        Map<String, Object> map = new HashMap<>();
        map.put("id", id);
        map.put("no", no);

        return map;
    }

    @RequestMapping(value="/demo/xxx")
//http://localhost:8080/demo/xxx  可以单独赋值一个参数
    public Map<String, Object> ann(
            @RequestParam(name = "user", required = false, defaultValue = "admin") String account,
            @RequestParam(name = "pass", required = false, defaultValue = "123") String password) {
        Map<String, Object> map = new HashMap<>();
        map.put("account", account);
        map.put("password", password);

        return map;
    }

    @RequestMapping(value="/demo/bean")
//http://localhost:8080/demo/bean  可以直接赋值给实体类的属性
    public Map<String, Object> bean(User user) {
        Map<String, Object> map = new HashMap<>();
        map.put("account", user.getAccount());
        map.put("password", user.getPassword());

        return map;
    }
}

实体类

package com.example.demo.entity;

public class User {
    private String account;
    private String password;

    public String getAccount() {
        return account;
    }

    public void setAccount(String account) {
        this.account = account;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "account='" + account + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

Rest风格的使用

package com.example.demo.controller;

import com.example.demo.entity.User;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
public class RestUserController {
    // 通过id查询用户信息
    // @RequestMapping(value = "/user/{id}", method = RequestMethod.GET)
    @GetMapping("/user/{id}")
    // @PathVariable从请求中找到id为可以的值赋值方法参数id
    public void getUser(@PathVariable int id) {
        System.out.println("查询到了id="+id);
    }

    // 查询所有用户信息
    @RequestMapping(value = "/user", method = RequestMethod.GET)
    public void getUser() {
        System.out.println("查询到所有信息");
    }

    // 添加用户信息，同样可以将参数直接赋值给实体类
    @RequestMapping(value = "/user", method = RequestMethod.POST)
    public void saveUser(User user, Model model) {
        System.out.println(model);
        System.out.println("添加用户信息 user:"+ user);
    }

    // 修改用户信息 可以使用json传参
    @RequestMapping(value = "/user", method = RequestMethod.PUT)
    public void updateUser(@RequestBody List<User> user) {
        System.out.println("修改用户信息");
    }

    // 修改用户信息
    @RequestMapping(value = "/user/{id}", method = RequestMethod.DELETE)
    public void deleteUser(@PathVariable int id) {
        System.out.println("删除用户信息 id = " + id);
    }
}

SpringBoot默认不支持jsp，需要配置支持

jsp配置

工程结构：

引入依赖tomcat-embed-jasper（版本号可以去掉）

<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-jasper</artifactId>
</dependency>

修改打包方式为war

<packaging>war</packaging>

手动建立webapp目录，并生成web.xml

Idea生成web.xml方式：

到这里依然不能访问jsp

要在application.properties中添加如下配置：

spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp

并写配置类

package com.boot.jsp.bootjsp.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class JspController {

    @GetMapping("/jsp")
    public String index() {
        return "index";
    }
}

使用插件运行后，就可以使用http://localhost:8080/jsp访问jsp了

freemarker配置

工程目录：

引入freemarker依赖

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

index.ftl---freemarke页面

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>测试</title>
</head>
<body>
    boot集成freemarker引擎
    <br>
姓名: ${user.name}
年龄: ${user.age}
<#--生日: ${user.birth}-->
</body>
</html>

package com.boot.freemark.demo.bootfreemarker1.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

import java.util.Date;
import java.util.HashMap;
import java.util.Map;

@Controller
public class FreemarkerController {
    @GetMapping("/index")
    public String index() {
        return "index";
    }

    @GetMapping("/data")
    public String data(Model model) {
        Map<String, Object> map = new HashMap<>();
        map.put("name","往屋里");
        map.put("age", 10);
        map.put("birth", new Date());
        model.addAttribute("user", map);

        return "index";
    }
}

配置后就可以直接通过url访问了

templates文件夹中放置模板文件

thymeleaf配置

工程结构：

引入依赖

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

模板：

<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>测试</title>
</head>
<body>
    boot集成thymeleaf
    <img src="data:images/tt.jpg">
</body>
</html>

配置类：

package com.boot.thyemeleaf.boootthyemeleaf.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

import java.util.HashMap;
import java.util.Map;

@Controller
public class ThymeleafController {

    @GetMapping("/index")
    public String index() {
        return "index";
    }

    @GetMapping("/data")
    public String data(Model model) {
        Map<String, Object> map = new HashMap<>();
        map.put("name","往屋里");
        map.put("age", 10);
        model.addAttribute("user", map);

        return "index";
    }
}

静态资源配置：

spring.resources.staticLocations=修改静态资源的路径（一般不改）

默认路径在static目录下

静态资源可以在页面中直接使用路径进行访问，也可以通过URL进行访问，如上边的img资源