SpringBoot 整合 freemarker

package com.alancode.springboot.controller;
/**
 * @author Alan_liu
 * @Create 2021/2/16 21:40
 */

import com.alancode.springboot.pojo.Users;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.ArrayList;
import java.util.List;

/**
 *@description: SpringBoot 整合 jsp
 *@author: Alan_Liu
 *@create: 2021-02-16 21:40
 */
@Controller  /**做view视图 跳转的  所有这里不能使用@RestController ***/
public class UserController {

	  @RequestMapping("/showUserInfo")
      public String showUser(Model model){
		 List<Users> list=new ArrayList<>();
		 list.add(new Users(1,"张三",20)) ;
		 list.add(new Users(2,"李四",20)) ;
		 list.add(new Users(3,"王五",20)) ;
		 list.add(new Users(4,"赵六",20)) ;
		 //需要一个 model 对象
         model.addAttribute("list",list);
         //视图跳转
		 return "userList";
      }
}

package com.alancode.springboot.controller;/**
 * @author Alan_liu
 * @Create 2021/2/16 23:33
 */

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

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

/**
 *@program: SpringBootAddJsp
 *@description: HelloWorld
 *@author: Alan_Liu
 *@create: 2021-02-16 23:33
 */
public class HelloWorld {
	/**
	 * @return
	 * @throws
	 * @Param: []
	 * @author Alan_Liu
	 * @date 2021/2/14 21:52
	 **/
	@RequestMapping("/hello")
	@ResponseBody
	public Map<String, Object> showHelloWolrd() {
		Map<String, Object> map = new HashMap<String, Object>();
		map.put("msg", "HelloWorld");
		return map;
	}
	@RequestMapping("/index")
	public String index(Map<String,String>map){
		map.put("name","hello freemarker!");
		return "index";
	}
	@RequestMapping("/welcome")
	public String welcome(Map<String,String>map){
		map.put("name","welcom to freemarker!");
		return "welcome";
	}
	@RequestMapping("/toError")
	public String toError(Map<String,String>map){
		map.put("name","hello freemarker!");
		int a=1/0;//异常
		return "index";
	}

}

package com.alancode.springboot.exception;
/**
 * @author Alan_liu
 * @Create 2021/2/18 0:08
 */

import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *@program: SpringBootAddFreemarker
 *@description: ExceptionHandler
 *@author: Alan_Liu
 *@create: 2021-02-18 00:08
 */
public class ExceptionHandler {
	/***
	 *定义要跳转的错误页面
	 *@author Alan_Liu
	 *@date   2021/2/18 0:16
	 **/
	public static final  String  MY_ERROR_PAGE="error";

	@org.springframework.web.bind.annotation.ExceptionHandler(Exception.class)
    public Object errorHandler(HttpServletRequest request, HttpServletResponse response,Exception e){
    	//打印异常
		System.out.println("捕获异常：");
		e.printStackTrace();
		ModelAndView m=new ModelAndView();
		//添加异常信息
		m.addObject("exception",e.getMessage());
		m.addObject("url",request.getRequestURI());
		//设置视图
		m.setViewName(MY_ERROR_PAGE);
		return m;
    }


}

package com.alancode.springboot.pojo;
/**
 * @author Alan_liu
 * @Create 2021/2/16 21:44
 */

/**
 *@program: SpringBootAddJsp
 *@description: 用户
 *@author: Alan_Liu
 *@create: 2021-02-16 21:44
 */
public class Users {

	private Integer userid;
	private String  username;
	private Integer userage;

	public Integer getUserid() {
		return userid;
	}

	public void setUserid(Integer userid) {
		this.userid = userid;
	}

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public Integer getUserage() {
		return userage;
	}

	public void setUserage(Integer userage) {
		this.userage = userage;
	}

	@Override
	public String toString() {
		return "Users{" +
				"userid=" + userid +
				", username=‘" + username + ‘\‘‘ +
				", userage=" + userage +
				‘}‘;
	}

	public Users() {
	}

	public Users(Integer userid, String username, Integer userage) {
		this.userid = userid;
		this.username = username;
		this.userage = userage;
	}

	public Users(Integer userid) {
		this.userid = userid;
	}

	public Users(Integer userid, String username) {
		this.userid = userid;
		this.username = username;
	}

	public Users(String username) {
		this.username = username;
	}

	public Users(String username, Integer userage) {
		this.username = username;
		this.userage = userage;
	}
}

package com.alancode.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * @author Alan_Liu
 */
@SpringBootApplication
public class FreemarkerApplication {

	public static void main(String[] args) {
		SpringApplication.run(FreemarkerApplication.class, args);
	}

}

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>错误页面</title>
</head>
<body>
错误：${exception}
<br/>
地址：${url}
$END$
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>错误页面</title>
</head>
<body>
错误：${exception}
<br/>
地址：${url}
$END$
</body>
</html>