SSM框架把日志信息保存到数据库过程详解

1）在service层和mapper层中写一个插入方法和查询方法；

我们先写一个日志类；定义属性；并且要在数据库中建好表；

package entity;

public class Log {
  private Integer id;
  private Integer logtype;
  private String description;
  private String param;

  public Log(){

  }
  public Log(Integer id, Integer logtype, String description, String param) {
    this.id = id;
    this.logtype = logtype;
    this.description = description;
    this.param = param;
  }

  @Override
  public String toString() {
    return "Log{" +
        "id=" + id +
        ", logtype=" + logtype +
        ", description='" + description + '\'' +
        ", param='" + param + '\'' +
        '}';
  }

  public Integer getId() {
    return id;
  }

  public void setId(Integer id) {
    this.id = id;
  }

  public Integer getLogtype() {
    return logtype;
  }

  public void setLogtype(Integer logtype) {
    this.logtype = logtype;
  }

  public String getDescription() {
    return description;
  }

  public void setDescription(String description) {
    this.description = description;
  }

  public String getParam() {
    return param;
  }

  public void setParam(String param) {
    this.param = param;
  }
}

该写方法了

1、logService.java页面;

public interface LogService {
  int insert(Log log);
  List<Log> findAll();
}

2、logServiceImpl.java页面；

@Service
public class LogServiceImpl implements LogService {
  @Autowired
  private LogMapper logMapper;
  @Override
  public int insert(Log log) {
    int i=logMapper.insert(log);
    return i;
  }
  @Override
  public List<Log> findAll() {
    List<Log> logs=logMapper.findAll();
    return logs;
  }
}

3、logMapper.java页面：

public interface LogMapper {
  int insert(Log log);
  List<Log> findAll();
}

4、logMapper.xml页面；

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="mapper.LogMapper">
  <insert id="insert">
    <selectKey keyProperty="id" resultType="integer" order="BEFORE">
      select seq_logaspect.nextval from dual
    </selectKey>
    insert into logaspect(id,logtype,description,param) values (#{id},#{logtype},#{description},#{param})
  </insert>
  <select id="findAll" resultType="entity.Log">
    select * from logaspect
  </select>
</mapper>

5、由于我们打印日志是通过切面，所以我们写一个切面类；

package aop;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import entity.Log;
import entity.Student;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import service.LogService;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.util.Map;

@Component//对象由spring管理
@Aspect//切面注解
public class LogAspect {
  @Autowired
  private LogService logService;
  private static final Logger LOGGER = LogManager.getLogger(LogAspect.class);

  //定义切入点，切入到添加了LogData注解的方法上
  @Pointcut("@annotation(aop.LogData)")
  public void pointCut(){

  }

  /**
   * 记录日志的切面方法
   * 在该方法中定义统一的日志记录逻辑
   * @param joinPoint
   */
  @Before("pointCut()")
  public void log(JoinPoint joinPoint){
    System.out.println("进入日志Aspect");
    //获取到方法签名
    MethodSignature signature= (MethodSignature) joinPoint.getSignature();
    //获取到连接点方法对象
    Method method=signature.getMethod();
    //获取方法上面特定的注解
    LogData annotation=method.getAnnotation(LogData.class);
    LogType logType=annotation.logType();
    String description=annotation.description();
    LOGGER.info("获取到注解内容：logType="+logType.getType()
        +",description:"+description);
    //aop中获取request
    ServletRequestAttributes requestAttributes= (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
    HttpServletRequest request=requestAttributes.getRequest();
    HttpSession session=request.getSession();
    //获取操作人
    Student student= (Student) session.getAttribute("student");
    //获取请求数据
    Map<String,String[]> parameterMap=request.getParameterMap();
    //将对象转换成json字符串==>存储到请求数据字段中
    //jackSon json字符串操作
    ObjectMapper objectMapper=new ObjectMapper();
    try {
      String s=objectMapper.writeValueAsString(parameterMap);
      LOGGER.info("请求数据："+s);
      Log log = new Log();
      log.setLogtype(logType.getType());
      log.setDescription(description);
      log.setParam(s);
      logService.insert(log);
    } catch (JsonProcessingException e) {
      e.printStackTrace();
    }

    //todo 将日志信息保存到数据库 LogController service mapper jsp
  }
}

6、写一个loglist.jsp页面来展示信息；

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
  <title>用户列表</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/user/selAll">
  <input type="submit" value="查询">
</form>
<table border="1px">
  <thead>
  <tr>
    <td>ID</td>
    <td>LOGTYPE</td>
    <td>DESCRIPTION</td>
    <td>PARAM</td>
  </tr>
  </thead>
  <tbody>
  <c:forEach var="log" items="${logs}">
    <tr>
      <td>${log.id}</td>
      <td>${log.logtype}</td>
      <td>${log.description}</td>
      <td>${log.param}</td>
    </tr>
  </c:forEach>
  </tbody>
</table>
<a href="${pageContext.request.contextPath}/user/list" rel="external nofollow" >返回list页面</a>
</body>
</html>

7、最后，我们写一个控制层的方法；

package controller;

import aop.LogData;
import aop.LogType;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import entity.Log;
import entity.Student;
import mapper.StudentsMapper;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import service.LogService;
import service.StudentService;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.List;

/**
 * 控制层调service，service调dao层
 */
@Controller
@RequestMapping("/user")
public class UserController {

  //定义日志对象
  //private static final Logger logger= LogManager.getLogger(UserController.class);
  @Autowired
  private StudentService studentService;
  @Autowired
  private LogService logService;
  @RequestMapping("/list") //@ModelAttribute(name = "params") ：向request域中存值
  public String list(ModelMap modelMap,@RequestParam HashMap<String,Object> map){
    //定义debug级别的日志
    //logger.debug("前台传递的查询条件："+map);
    //logger.info("info级别日志："+map);
    System.out.println("前台传递的查询条件："+map);
    //List<Student> students = studentService.findAll();
//    List<Student> students = studentService.findByMap(map);
//    modelMap.put("students",students);
    PageInfo<Student> page = studentService.findByPage(map);
    //记录error级别日志
    //logger.error("查询到分页数据："+page);
    System.out.println("查询到分页数据："+page);
    modelMap.put("page",page);
    modelMap.put("params",map);//将查询条件回传到页面，用于回显查询条件
    return "list.jsp";
  }

  @LogData(logType = LogType.DELETE,description = "学生信息删除")
  @RequestMapping("/delete")
  public String delete(Integer id){
    studentService.delete(id);
    return "redirect:list";
  }
  @LogData(logType = LogType.UPDATE,description = "学生信息修改")
  @RequestMapping("/update2")
  public String update2(Integer id,ModelMap modelMap){
    Student student = studentService.selectById(id);
    modelMap.put("student",student);
    return "update.jsp";
  }

  //根据是否存在id值，来判断是执行新增还是修改操作
  @RequestMapping("/update")
  public String update(Student student){
    studentService.update(student);
    return "redirect:list";
  }
  @LogData(logType = LogType.INSERT,description = "学生信息新增")
  @RequestMapping("/insert")
  public String insert(Student student){
    studentService.insert(student);
    return "redirect:list";
  }

  @Autowired
  private StudentsMapper studentsMapper;
  @RequestMapping("list2")
  public String list2(ModelMap modelMap){
    PageHelper.startPage(1,5);
    List<Student> students=studentsMapper.selectAll();
    modelMap.put("students",students);
    PageInfo<Student> pageInfo=new PageInfo<>(students);
    System.out.println(pageInfo);
    return "list.jsp";
  }

  @RequestMapping("/selAll")
  public String findAll(ModelMap modelMap){
    List<Log> logs = logService.findAll();
    modelMap.put("logs",logs);
    return "loglist.jsp";
  }

 }

测试结果，我们出来的页面效果是：

即说明打印日志成功了；

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