方法一：把陣列轉為字串，然後把[ ]替換為(),在拼起來

  public static void query(Connection conn,String[] arr ){
	  PreparedStatement pst=null; 
	  ResultSet rs=null;
	  StringBuilder sql=new StringBuilder("select * from test_lin where id in ");
	  try {	
		String arrStr=Arrays.toString(arr).replace("[", "(").replace("]", ")");
		sql.append(arrStr);
		pst=conn.prepareStatement(sql.toString());
		rs=pst.executeQuery();
		while(rs.next()){
			System.out.println("id="+rs.getString(1)+"\tname="+rs.getString(2));
		}
	} catch (SQLException e) {
		e.printStackTrace();
	}finally{  		
        close(rs, pst, conn);  
    }  
	 
  }
 

方法二：用佔位符?來拼

 public static void query(Connection conn,String[] arr ){
	  PreparedStatement pst=null; 
	  ResultSet rs=null;
	  StringBuilder sql=new StringBuilder("select * from test_lin where id in ");
	  try {	
		  int len=arr.length;
		  sql.append("(");
		for(int i=0;i<len;i++){
			sql.append("?");
			if(i!=len-1){
				sql.append(",");
			}
		}
		sql.append(")");
		pst=conn.prepareStatement(sql.toString());
		for(int j=0;j<len;j++){
			pst.setObject(j+1,arr[j]);
		}
		rs=pst.executeQuery();
		while(rs.next()){
			System.out.println("id="+rs.getString(1)+"\tname="+rs.getString(2));
		}
	} catch (SQLException e) {
		e.printStackTrace();
	}finally{  		
        close(rs, pst, conn);  
    }  
	 
  }