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public class SqlFormat{ public static void main(String[] args){ String sql=""; sqlFormat(sql); } public static Map<String, String> map = new HashMap<String, String>();//需要换行的字段 public static Map<String, String> bracket= new HashMap<String, String>();//括号前关键字 static{ map.put("select", "select"); map.put("from", "from"); map.put("group by", "group by"); map.put("where", "where"); map.put("order by", "order by"); bracket.put("not", "not"); map.put("(", "("); map.put(")", ")"); } public static String SqlFormat(String sql){ sql = sql.trim().replaceAll(",", ", ").replaceAll(" +", " ").replaceAll("\\s+", " ").replace(" ", " |").replace("(", "|(|").replace(")", "|)|").replace("| |", " |").replace("||", "|"); sql = sql.toLowerCase(); int sj=0;// String[] sqlArray = sql.split("\\|"); int length = sqlArray.length; Stack stack = new Stack(); Stack stackTemp = new Stack(); for(int i=0;i<length; i++){ if("(".equals(sqlArray[i]).trim())){ if(map.get(sqlArray[i+1].trim())!=null){//后有关键字 stack.push("("); printlnSql(sqlArray[i], sj); }else if(bracket.get(sqlArray[i-1].trim())!=null){//前有关键字 stack.push("("); printlnSql(sqlArray[i], sj); }else{ stackTemp.push("("); System.out.println(sqlArray[i]); } }else if(")".equals(sqlArray[i].trim())){ if(stackTemp.size()>0){ stackTemp.pop(); System.out.println(sqlArray[i]); }else{ stackTemp.pop(); sj=stack.size(); printlnSql(sqlArray[i], sj); } }else if("".equals(sqlArray[i].trim())){ }else if("(".equals(sqlArray[i].trim()) && map.get(sqlArray[i-1].trim())!=null){ }else if(map.get(sqlArray[i].trim())!=null){ printlnSql(sqlArray[i], sj); }else{ System.out.print(sqlArray[i]); } } return sql; } pubulic static void printlnSql(String sqlSub, int i){ if(i>0){ System.out.println("\n"); for(int j=0; j<i; j++){ System.out.println("\t\t"); } }else{ System.out.println(‘\n‘+sqlSub); } } }
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原文地址:http://www.cnblogs.com/firstdream/p/5671435.html