edit.java

重点不是信息管理系统

package com.yijia_ctgu.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.json.simple.JSONObject;

import com.yijia_ctgu.DB.DB;
import com.yijia_ctgu.exception.AlreadyExistException;
import com.yijia_ctgu.exception.NotQueryException;
/**
 * 
 * @author yijia
 *
 */
public class Edit extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public Edit() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doPost(request,response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		 res.setCharacterEncoding("utf-8");
			res.setContentType("text/html");
			PrintWriter out = res.getWriter();
			String tableName=req.getParameter("tableName");
			String id=req.getParameter("id");
			//System.out.println(id);
			Enumeration enu=req.getParameterNames();
			JSONObject obj=new JSONObject();
		    ArrayList list=new ArrayList();
		    while(enu.hasMoreElements()){
		    	String propertyName=(String)enu.nextElement();
		    	String propertyValue=(String)req.getParameter(propertyName);
		    	System.out.println(propertyName+" "+propertyValue);
		    	String temp[]=new String[2];
		    	if(!("".equals(propertyValue)||propertyValue==null||propertyName.equals("tableName"))){
		    		temp[0]=propertyName;
		    		temp[1]=propertyValue;
		    		list.add(temp);
		    	}
		    }
		    Object[] propertyObjec=list.toArray();
		    String[][] property=new String[propertyObjec.length][];
		    for(int j=0;j<propertyObjec.length;j++){
		    	property[j]=(String[])propertyObjec[j];
		    	//System.out.println(property[j][0]+property[j][1]);
		    }
			try {
				DB.getTable(tableName).getRow(id).set(property);
				obj.put("success", true);
			} catch (SQLException e) {
				obj.put("errors", "数据库错误");
			} catch (NotQueryException e) {
				System.out.println("不可能的事发生了");
			}
		out.println(obj);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}