Android连接服务器数据库查询+Gson解析（List和Map）格式json数据（一）

1、服务器端代码

package com.pdsu.book.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

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

import com.google.gson.Gson;
import com.pdsu.book.user.Book;

public class SelectServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public SelectServlet() {
		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 {
		this.doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		response.setCharacterEncoding("utf-8");
		request.setCharacterEncoding("utf-8");
		String url = "jdbc:sqlserver://127.0.0.1:1433;databaseName=lib_books;user=sa;password=1234";// sa身份连接

		String bookinfo = request.getParameter("bookinfo");
		System.out.println(bookinfo);
		// String password = request.getParameter("password");
		// String username = "xiaoming";
		// String password = "xiaoming";
		String result = "";