主要实现的功能是两个数据库之前数据的同步（保证两个数据库的数据相同）
思路：
1.mybatis拦截系统执行的增加、删除、修改的SQL
2.拦截到的SQL进行base64加密存入数据库的记录表中
3.使用线程池调用相关的接口把拦截的SQL在另一个系统中执行
主要代码：
1.拦截SQL保存并调用相关接口
import com.baomidou.mybatisplus.toolkit.IdWorker;
import dc.platform.admin.common.utils.IpUtil;
import dc.platform.admin.common.utils.SysHttpClient;
import dc.platform.admin.common.utils.UtilValidate;
import dc.platform.admin.modules.sys.controller.AbstractController;
import dc.platform.admin.modules.sys.entity.SysUserEntity;
import dc.platform.common.utils.SpringContextUtils;
import net.sf.json.JSONObject;
import org.apache.commons.collections.CollectionUtils;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.plugin.*;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.type.TypeHandlerRegistry;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.ConnectionCallback;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.text.DateFormat;
import java.util.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.regex.Matcher;
/**
* @author MengyuWu
* @Title: ${file_name}
* @Package ${package_name}
* @Description: ${todo}
* @date 2018/3/21 16:15
*/
@Intercepts({
@Signature(type = Executor.class, method = "update", args = { MappedStatement.class, Object.class })
})
@Component
public class MybatisInterceptor extends AbstractController implements Interceptor {
@Value("${SynURL}")
private String url;
@Override
public Object intercept(Invocation invocation) throws Throwable {
//获取当前请求
HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
//加载jdbc
JdbcTemplate jdbcTemplate = (JdbcTemplate)SpringContextUtils.getBean("jdbcTemplate");
try{
MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0]; // 获取xml中的一个select/update/insert/delete节点，主要描述的是一条SQL语句
Object parameter = null;
// 获取参数，if语句成立，表示sql语句有参数，参数格式是map形式
if (invocation.getArgs().length > 1) {
parameter = invocation.getArgs()[1];
System.out.println("parameter = " + parameter);
}
String sqlId = mappedStatement.getId(); // 获取到节点的id,即sql语句的id
System.out.println("sqlId = " + sqlId);
BoundSql boundSql = mappedStatement.getBoundSql(parameter); // BoundSql就是封装myBatis最终产生的sql类
Configuration configuration = mappedStatement.getConfiguration(); // 获取节点的配置
String sql = showSql(configuration, boundSql); // 获取到最终的sql语句
System.out.println("sql = " + sql);
//过滤系统操作记录表
if (!sql.contains("sys_record_oper")) {
Base64.Encoder encoder = Base64.getEncoder();
byte[] textByte = sql.getBytes("UTF-8");
//编码
String enSql = encoder.encodeToString(textByte);
System.out.println("enSql = " + enSql);
//获取当前登录人信息
SysUserEntity user = getUser();
//获取ip
String ip=IpUtil.getIpAddr(request);
//线程池调用相关的接口
ExecutorService fixedThreadPool = Executors.newFixedThreadPool(5);
//多线程池执行线程任务
fixedThreadPool.execute(new MyThread(url, enSql, user.getDeptId().toString()));
//拼接相关的保存系统操作记录的SQL
String insertsql="insert into sys_record_oper (id,method,oper_sql,ip,dept_id,last_upd_time,last_upd_person_id,last_upd_person_name) VALUES('"+IdWorker.getId()+"','"+sqlId+"','"+enSql+"','"+ip+"','"+user.getDeptId().toString()+"',NOW(),'"+user.getUserId().toString()+"','"+user.getUsername()+"');";
//执行保存到系统记录表中的SQL
jdbcTemplate.execute(new ConnectionCallback<Object>() {
@Override
public Object doInConnection(Connection con) throws SQLException, DataAccessException {
con.setAutoCommit(false);
PreparedStatement preparedStatement = con.prepareStatement(insertsql);
boolean execute = preparedStatement.execute();
con.commit();
return null;
}
});
}
}catch(Exception e){
// log.error(e.getMessage(), e);
}
return invocation.proceed();// 执行完上面的任务后，不改变原有的sql执行过程
}
// 封装了一下sql语句，使得结果返回完整xml路径下的sql语句节点id + sql语句
public static String getSql(Configuration configuration, BoundSql boundSql,String sqlId) {
String sql = showSql(configuration, boundSql);
StringBuilder str = new StringBuilder(100);
str.append(sqlId);
str.append(":");
str.append(sql);
return str.toString();
}
/*如果参数是String，则添加单引号， 如果是日期，则转换为时间格式器并加单引号； 对参数是null和不是null的情况作了处理<br> */
private static String getParameterValue(Object obj) {
String value = null;
if (obj instanceof String) {
value = "'" + obj.toString() + "'";
} else if (obj instanceof Date) {
DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.CHINA);
value = "'" + formatter.format(new Date()) + "'";
} else {
if (obj != null) {
value = obj.toString();
} else {
value = "";
}
}
return value;
}
// 进行？的替换
public static String showSql(Configuration configuration, BoundSql boundSql) {
Object parameterObject = boundSql.getParameterObject(); // 获取参数
List<ParameterMapping> parameterMappings = boundSql
.getParameterMappings();
String sql = boundSql.getSql().replaceAll("[\\s]+", " "); // sql语句中多个空格都用一个空格代替
if (CollectionUtils.isNotEmpty(parameterMappings) && parameterObject != null) {
TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry(); // 获取类型处理器注册器，类型处理器的功能是进行java类型和数据库类型的转换<br> // 如果根据parameterObject.getClass(）可以找到对应的类型，则替换
if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(parameterObject)));
} else {
MetaObject metaObject = configuration.newMetaObject(parameterObject);// MetaObject主要是封装了originalObject对象，提供了get和set的方法用于获取和设置originalObject的属性值,主要支持对JavaBean、Collection、Map三种类型对象的操作
for (ParameterMapping parameterMapping : parameterMappings) {
String propertyName = parameterMapping.getProperty();
if (metaObject.hasGetter(propertyName)) {
Object obj = metaObject.getValue(propertyName);
sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(obj)));
} else if (boundSql.hasAdditionalParameter(propertyName)) {
Object obj = boundSql.getAdditionalParameter(propertyName); // 该分支是动态sql
sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(obj)));
}else{sql=sql.replaceFirst("\\?","缺失");}//打印出缺失，提醒该参数缺失并防止错位
}
}
}
return sql;
}
@Override
public Object plugin(Object target) {
return Plugin.wrap(target, this);
}
@Override
public void setProperties(Properties properties) {
}
}
class MyThread implements Runnable {
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getEnsql() {
return ensql;
}
public void setEnsql(String ensql) {
this.ensql = ensql;
}
public String getDeptId() {
return deptId;
}
public void setDeptId(String deptId) {
this.deptId = deptId;
}
private String url;
private String ensql;
private String deptId;
public MyThread(String url, String ensql, String deptId) {
this.url = url;
this.ensql = ensql;
this.deptId = deptId;
}
@Override
public void run() {
try {
doRequestMenthod(url,ensql,deptId);
}catch (Exception e){
}
}
public void doRequestMenthod(String url,String ensql,String deptId) throws Exception{
JSONObject postJson = new JSONObject();
//封装请求体
postJson.put("ensql", ensql);
postJson.put("deptId", deptId);
//调用相关接口
String httpResult = SysHttpClient.doPostRequest(url, postJson.toString());
System.out.println("postJson = " + postJson.toString());
if(!UtilValidate.isEmpty(httpResult)){
JSONObject postJson1=JSONObject.fromObject(httpResult);
if(!"0".equals(postJson1.get("code"))){
throw new Exception("调用相应的接口异常");
}
}else{
throw new Exception("调用相应的接口异常");
}
}
}
2.系统接口方法
//系统接口
// @RequestMapping(value = "/synDate", method = RequestMethod.POST)
@RequestMapping("/synData")
@ResponseBody
public String synDate(@RequestBody JSONObject args, HttpServletRequest request)
{
JSONObject result = new JSONObject();
//获取部门id
String deptId = args.get("deptId").toString();
String ensql=args.get("ensql").toString();
//base64编码sql
Base64.Decoder decoder = Base64.getDecoder();
//执行接口传过来的SQL同步相关数据
try {
final String deSql = new String(decoder.decode(ensql), "UTF-8");
jdbcTemplate.execute(new ConnectionCallback<Object>() {
@Override
public Object doInConnection(Connection con) throws SQLException, DataAccessException {
con.setAutoCommit(false);
PreparedStatement preparedStatement = con.prepareStatement(deSql);
boolean execute = preparedStatement.execute();
con.commit();
return null;
}
});
result.put("desql",deSql);
result.put("code","0");
} catch (UnsupportedEncodingException e) {
result.put("code","001");
e.printStackTrace();
}
return result.toString();
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