f0dc180f5e6a001c11a084bb2852bb3b

来自「用java编写的程序」· 代码 · 共 83 行

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83 行
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package webbook.chapter4;

import java.io.IOException;
import java.io.PrintWriter;

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

/**
 * 
 * @author Liuwei
 * @version 1.0
 *
 */
public class SurveyServlet extends HttpServlet {

	private static final long serialVersionUID = -8179113771502345601L;

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

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();
		request.setCharacterEncoding("utf-8");
		out.println("<html>");
		out.println("<head><title>display survey infomation</title></head>");
		out.println("<body>");
		out.println("<h2>用户输入信息：</h2>");
		out.println("<strong>用户名：" + filter(request.getParameter("name")) + "</strong><br>");
		out.println("<strong>email：" + filter(request.getParameter("email")) + "</strong><br>");
		out.println("<strong>年纪：" + request.getParameter("age") + "</strong><br>");
		out.println("<strong>编程时间：" + request.getParameter("codetime") + "</strong><br>");
		out.println("<strong>使用的操作系统：</strong>");
		printValues(out, request.getParameterValues("os"));
		out.println("<strong>使用的编程语言：</strong>");
		printValues(out, request.getParameterValues("language"));
		out.println("<strong>建议：" + filter(request.getParameter("comment")) + "</strong><br>");
		out.println("</body>");
		out.println("</html>");

		out.flush();
		out.close();
	}

	/**
	 * 输出字符串数组中所有的元素
	 */
	public void printValues(PrintWriter out, String[] values) {
		if (values == null || values.length == 0) {
			return;
		}
		out.println("<ul>");
		for (int i = 0; i < values.length; i++) {
			out.println("<li>" + values[i] + "</li>");
		}
		out.println("</ul>");
	}

	/**
	 * 过滤<, >,\n 字符的方法
	 * 
	 * @param input
	 *            需要过滤的字符
	 * @return 完成过滤以后的字符串
	 */
	public String filter(String input) {
		if (input == null) {
			return null;
		}
		if (input.length() == 0) {
			return input;
		}
		input = input.replaceAll("<", "&lt;");
		input = input.replaceAll(">", "&gt;");
		return input.replaceAll("\n", "<br>");
	}
}

f0dc180f5e6a001c11a084bb2852bb3b - 源码说明

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