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：