ResultMapUtils快速生成mybatis resultMap

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package com.zy.platform.common.core.utils;import java.lang.reflect.Field;
import java.util.regex.Matcher;
import java.util.regex.Pattern;/*** @author javachen* @description 根据实体类,生成mybatis的resultMap*/
public class ResultMapUtils {private static Pattern humpPattern = Pattern.compile("[A-Z]");//使用方法,在具体的微服务模块System.out.println(getResultMap(Student.class));public static String getUpdateSelective(Class<?> clazz){Object obj = null;try{obj = clazz.newInstance();}catch (Exception e){return "#Exception.反射生成实体异常#";}String clazzName = clazz.getSimpleName();String resultMapId = Character.toLowerCase(clazzName.charAt(0))+clazzName.substring(1)+"Map";String pkgName = clazz.getName();StringBuilder resultMap = new StringBuilder();resultMap.append("<update id=\"updateSelective\" parameterType=\"");resultMap.append(pkgName);resultMap.append("\">\n");resultMap.append("UPDATE X_TABLE");resultMap.append("\n<set>\n");Field[] fields = clazz.getDeclaredFields();for(Field f : fields){String property = f.getName();String javaType = f.getType().getName();if("serialVersionUID".equals(property)){continue;//忽略掉这个属性}resultMap.append("    <if test=\"");resultMap.append(property+"!=null\">");resultMap.append(property2Column(property).toUpperCase());resultMap.append("=#{"+property+", jdbcType="+javaType2jdbcType(javaType.toLowerCase())+"},</if>\n");}resultMap.append("</set>\n");resultMap.append("where id = #{id,jdbcType=VARCHAR}\n");resultMap.append("</update>");return resultMap.toString();}public static void getInsert(Class<?> clazz){String text = getUpdateSelective(clazz);Pattern p = Pattern.compile("#\\{[^}]+}");Matcher m = p.matcher(text);while (m.find()){System.out.println(m.group()+",");}}/*** 获取表的字段* @param clazz*/public void getColumns(Class<?> clazz){String text = getResultMap(clazz);Pattern p = Pattern.compile("column=[\"\\w\"]+");Matcher m = p.matcher(text);while (m.find()) {Pattern p1 = Pattern.compile("[\"\\w\"]+$");Matcher m1 = p1.matcher(m.group());while (m1.find()) {Pattern p2 = Pattern.compile("[\\w]+");Matcher m2 = p2.matcher(m1.group());while (m2.find()) {System.err.println(m2.group().toUpperCase());}}}}/*** 获取ResultMap* @param clazz 实体类的Class* @return String*/public static String getResultMap(Class<?> clazz){Object obj = null;try{obj = clazz.newInstance();}catch (Exception e){return "#Exception.反射生成实体异常#";}String clazzName = clazz.getSimpleName();String resultMapId = Character.toLowerCase(clazzName.charAt(0))+clazzName.substring(1)+"Map";String pkgName = clazz.getName();StringBuilder resultMap = new StringBuilder();resultMap.append("<resultMap id=\"");resultMap.append(resultMapId);resultMap.append("\" type=\"");resultMap.append(pkgName);resultMap.append("\">\n");Field[] fields = clazz.getDeclaredFields();for(Field f : fields){String property = f.getName();String javaType = f.getType().getName();if("serialVersionUID".equals(property)){continue;//忽略掉这个属性}resultMap.append("    <result column=\"");resultMap.append(property2Column(property).toUpperCase());resultMap.append("\" jdbcType=\"");resultMap.append(javaType2jdbcType(javaType.toLowerCase()));resultMap.append("\" property=\"");resultMap.append(property);resultMap.append("\" />\n");}resultMap.append("</resultMap>");return resultMap.toString();}private static String property2Column(String property){Matcher matcher = humpPattern.matcher(property);StringBuffer sb = new StringBuffer();while(matcher.find()){matcher.appendReplacement(sb, "_"+matcher.group(0).toLowerCase());}matcher.appendTail(sb);return sb.toString();}private static String javaType2jdbcType(String javaType){if(javaType.contains("string")){return "VARCHAR";}else if(javaType.contains("boolean")){return "BIT";}else if(javaType.contains("byte")){return "TINYINT";}else if(javaType.contains("short")){return "SMALLINT";}else if(javaType.contains("int")){return "INTEGER";}else if(javaType.contains("long")){return "BIGINT";}else if(javaType.contains("double")){return "DOUBLE";}else if(javaType.contains("float")){return "REAL";}else if(javaType.contains("date")){return "DATE";}else if(javaType.contains("timestamp")){return "TIMESTAMP";}else if(javaType.contains("time")){return "TIME";}else if(javaType.contains("bigdecimal")){return "DECIMAL";}else{return "未知类型";}}}

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