Spring工程 使用日志

1.spring boot项目默认使用什么技术处理日志？

答：使用了log4j，使用log4j需要的配置：logback.xml配置文件和以下代码

 1 private static final Logger log = LoggerFactory.getLogger(UserController.class); 

 1 log.debug("===============================用户信息：", user); 2 log.info("正常信息"); 3 log.error("错误"); 

完整代码：

  1 package com.hzy.controller;
  2 
  3 import java.util.Collections;
  4 import java.util.LinkedHashMap;
  5 import java.util.Map;
  6 
  7 import javax.validation.Valid;
  8 
  9 import org.slf4j.Logger;
 10 import org.slf4j.LoggerFactory;
 11 import org.springframework.beans.factory.annotation.Autowired;
 12 import org.springframework.stereotype.Controller;
 13 import org.springframework.ui.Model;
 14 import org.springframework.validation.BindingResult;
 15 import org.springframework.web.bind.annotation.GetMapping;
 16 import org.springframework.web.bind.annotation.PathVariable;
 17 import org.springframework.web.bind.annotation.PostMapping;
 18 
 19 import com.hzy.dao.UserDao;
 20 import com.hzy.model.User;
 21 
 22 @Controller
 23 public class UserController {
 24 
 25     private static final Logger log = LoggerFactory.getLogger(UserController.class);
 26 
 27     final static Map<String, String> RADIO_GENDER = Collections.unmodifiableMap(new LinkedHashMap<String, String>() {
 28         private static final long serialVersionUID = 1L;
 29         {
 30             put("男", "男");
 31             put("女", "女");
 32         }
 33     });
 34 
 35     final static Map<String, String> CHECK_COURSE = Collections.unmodifiableMap(new LinkedHashMap<String, String>() {
 36         private static final long serialVersionUID = 1L;
 37 
 38         {
 39             put("Java程序设计", "java");
 40             put("Spring", "spring");
 41             put("MySQL", "mysql");
 42             put("HTML", "html");
 43         }
 44     });
 45 
 46     final static Map<String, String> SELECT_HOMETOWN = Collections.unmodifiableMap(new LinkedHashMap<String, String>() {
 47         private static final long serialVersionUID = 1L;
 48         {
 49             put("上海", "上海");
 50             put("广东", "广东");
 51             put("广州", "广州");
 52         }
 53     });
 54 
 55     final static Map<String, String> SELECT_HOBBIES = Collections.unmodifiableMap(new LinkedHashMap<String, String>() {
 56         private static final long serialVersionUID = 1L;
 57         { 59             put("听歌", "听歌");
 60             put("玩游戏", "玩游戏");
 61             put("睡觉", "睡觉");
 62             put("看电视", "看电视");
 63         }
 64     });
 65 
 66     @Autowired
 67     private UserDao userDao;
 68 
 69     /** 控制器的方法 **/
 70 
 71     @GetMapping("/")
 72     public String index() {
 73         return "redirect:/allUser";
 74     }
 75 
 76     @GetMapping("/allUser")
 77     public String allUser(Model model) {
 78         model.addAttribute("users", userDao.getUsers());
 79         return "list-user";
 80     }
 81 
 82     @GetMapping("/adduser")
 83     public String showAddUserForm(Model model) {
 84         User user = new User();
 85         user.setId(userDao.getMaxId());
 86         model.addAttribute("user", user);
 87         model.addAttribute("radioItems", RADIO_GENDER);
 88         model.addAttribute("checkItems", CHECK_COURSE);
 89         model.addAttribute("selectItems", SELECT_HOMETOWN);
 90         model.addAttribute("multipleItems", SELECT_HOBBIES);
 91         return "add-user";
 92     }
 93 
 94     @PostMapping("/adduser")
 95     public String addUser(@Valid User user, BindingResult bindingResult, Model model) {
 96 
 97         if (bindingResult.hasErrors()) {
 98             model.addAttribute("user", user);
 99             model.addAttribute("radioItems", RADIO_GENDER);
100             model.addAttribute("checkItems", CHECK_COURSE);
101             model.addAttribute("selectItems", SELECT_HOMETOWN);
102             model.addAttribute("multipleItems", SELECT_HOBBIES);
103             return "add-user";
104         }
105 
106         userDao.getUsers().add(user);
107 
108         System.out.println("-----------------------------------------------------"+user);
109 
110         log.debug("===============================用户信息：", user);
111         log.info("正常信息");
112         log.error("错误");
113 
114         return "redirect:/allUser";
115     }
116 
117     @GetMapping("/edit/{id}") // {id}是占位符
118     public String showUpdateForm(@PathVariable("id") long id, Model model) { // @PathVariable 路径变量
119         User user = userDao.getUser(id);
120         model.addAttribute("user", user);
121         return "update-user";
122     }
123 
124     @PostMapping("/update/{id}")
125     public String updateUser(@PathVariable("id") long id, @Valid User user, BindingResult bindingResult) {
126         if (bindingResult.hasErrors()) {
127             return "update-user";
128         }
129         userDao.update(user, id);
130         return "redirect:/allUser";
131     }
132 
133     @GetMapping("/delete/{id}")
134     public String deleteUser(@PathVariable("id") long id, Model model) {
135         userDao.delete(id);
136         return "redirect:/allUser";
137     }
138 
139 }

2.日志配置文件logback.xml放在哪里？

答：放在src/main/resources目录下